不可能的需求

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由于开发过程中需要对图片进行处理，需要对图片获取尽可能详细的信息，比如图片的Exif通常包含一些照片拍摄修改的时间，分辨率，大小,经纬度等信息，突然一天新增了一个需求：需要获取图片是前置摄像头拍摄还是后置摄像头拍摄的。得知需求后查询了一众资料，两大搜索Google，百度，Android Developer官方文档，MediaStore中关于Image的类属性、方法，Exif等元数据解析等等，均未看到有标记前后置摄像头的属性，于是反馈，后被告知一加6拍摄的照片有相应字段，于是乎单独拿出来分析了。

不可能的需求?

已知需求：获取图片是前置摄像头拍摄还是后置摄像头拍摄的
尝试方法：

  1. 两大搜索(Google,Baidu)
  2. Android Developer官方文档以及MediaStore中关于Image的类属性、方法
  3. MetaData数据分析

尝试结果：

  1. 失败
  2. 失败

图片的MetaData数据分析

什么是图片的Metadata？摘一段Wiki的解释

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Photographs
Metadata may be written into a digital photo file that will identify who owns it, copyright and contact information, what brand or model of camera created the file, along with exposure information (shutter speed, f-stop, etc.) and descriptive information, such as keywords about the photo, making the file or image searchable on a computer and/or the Internet. Some metadata is created by the camera and some is input by the photographer and/or software after downloading to a computer. Most digital cameras write metadata about model number, shutter speed, etc., and some enable you to edit it;[35] this functionality has been available on most Nikon DSLRs since the Nikon D3, on most new Canon cameras since the Canon EOS 7D, and on most Pentax DSLRs since the Pentax K-3. Metadata can be used to make organizing in post-production easier with the use of key-wording. Filters can be used to analyze a specific set of photographs and create selections on criteria like rating or capture time.

Photographic Metadata Standards are governed by organizations that develop the following standards. They include, but are not limited to:

IPTC Information Interchange Model IIM (International Press Telecommunications Council),
IPTC Core Schema for XMP
XMP – Extensible Metadata Platform (an ISO standard)
Exif – Exchangeable image file format, Maintained by CIPA (Camera & Imaging Products Association) and published by JEITA (Japan Electronics and Information Technology Industries Association)
Dublin Core (Dublin Core Metadata Initiative – DCMI)
PLUS (Picture Licensing Universal System).
VRA Core (Visual Resource Association)[36]

Wiki对Exif的解释-https://zh.wikipedia.org/wiki/EXIF
Wiki对XMP的解释-https://zh.wikipedia.org/wiki/XMP

如果你需要查看一张图片的MetaData信息，在不下载任何程序的情况下，当然是放网站上识别了，如：http://metapicz.com/#landing
现在我有一张图使用魅族6 Note拍摄，如下：

将其使用网站识别的结果如下：

可以看出，除了基本的Exif信息，就没有其余的多余信息了，同时还测试了一加5T，vivo，华为，三星，小米等几部手机，都一样没有，贴个一加5T的，其他的就不贴了，如下：

将其使用网站识别的结果如下：

网站显示没有XMP数据，但是你如果信以为真，那你就错了，网站展示的XMP数据只是对标准XMP数据而言，但是对于非标准XMP数据，网站是不识别的。下面我不使用很专业的分析工具，我们使用PhotoShop，它用来分析图片MetaData很是方便。
具体步骤

  1. 将图片使用PhotoShop打开
  2. 使用快捷键CTRL+ALT+SHFIT+I打开MetaData面板
  3. 点击原始数据

下面分别是魅族拍摄的照片的元数据和一加5T拍摄的照片的元数据
魅族6 Note 前置：

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<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <xmp:CreatorTool>Meizu Camera</xmp:CreatorTool>
         <xmp:ModifyDate>2018-08-02T15:27:15.043670</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-02T15:27:15</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-02T15:27:15.043670</xmp:MetadataDate>
         <photoshop:DateCreated>2018-08-02T15:27:15.072032704</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>BF515DD22603ACF5DFF3D111542D91CE</xmpMM:DocumentID>
         <xmpMM:InstanceID>BF515DD22603ACF5DFF3D111542D91CE</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>4608</tiff:ImageWidth>
         <tiff:ImageLength>3456</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>Meizu</tiff:Make>
         <tiff:Model>M6 Note</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>4608</exif:PixelXDimension>
         <exif:PixelYDimension>3456</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-02T15:27:15</exif:DateTimeOriginal>
         <exif:ExposureTime>1/50</exif:ExposureTime>
         <exif:FNumber>200/100</exif:FNumber>
         <exif:ExposureProgram>0</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>123</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>5644/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>2000000/1000000</exif:ApertureValue>
         <exif:BrightnessValue>248/100</exif:BrightnessValue>
         <exif:MeteringMode>2</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>2</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>3519/1000</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>25</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>043670</exif:SubSecTime>
         <exif:SubSecTimeOriginal>043670</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>043670</exif:SubSecTimeDigitized>
         <exif:GPSLatitude>31,12.8173N</exif:GPSLatitude>
         <exif:GPSLongitude>121,27.1615E</exif:GPSLongitude>
         <exif:GPSAltitudeRef>200/100</exif:GPSAltitudeRef>
         <exif:GPSAltitude>0/1000</exif:GPSAltitude>
         <exif:GPSTimeStamp>2018-08-02T07:27:14Z</exif:GPSTimeStamp>
         <exif:GPSImgDirectionRef>M</exif:GPSImgDirectionRef>
         <exif:GPSImgDirection>0/1</exif:GPSImgDirection>
         <exif:GPSProcessingMethods>NETWORK</exif:GPSProcessingMethods>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

魅族6 Note 后置：

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<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <xmp:CreatorTool>Meizu Camera</xmp:CreatorTool>
         <xmp:ModifyDate>2018-08-02T15:26:52.141073</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-02T15:26:52</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-02T15:26:52.141073</xmp:MetadataDate>
         <photoshop:DateCreated>2018-08-02T15:26:51.339079232</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>0782F6701AFCAD765F7A8E128F350371</xmpMM:DocumentID>
         <xmpMM:InstanceID>0782F6701AFCAD765F7A8E128F350371</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>3000</tiff:ImageWidth>
         <tiff:ImageLength>4000</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>Meizu</tiff:Make>
         <tiff:Model>M6 Note</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>3000</exif:PixelXDimension>
         <exif:PixelYDimension>4000</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-02T15:26:52</exif:DateTimeOriginal>
         <exif:ExposureTime>1/25</exif:ExposureTime>
         <exif:FNumber>190/100</exif:FNumber>
         <exif:ExposureProgram>0</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>109</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>4643/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>1851999/1000000</exif:ApertureValue>
         <exif:BrightnessValue>132/100</exif:BrightnessValue>
         <exif:MeteringMode>2</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>2</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>3940/1000</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>24</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>141073</exif:SubSecTime>
         <exif:SubSecTimeOriginal>141073</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>141073</exif:SubSecTimeDigitized>
         <exif:GPSLatitude>31,12.8173N</exif:GPSLatitude>
         <exif:GPSLongitude>121,27.1615E</exif:GPSLongitude>
         <exif:GPSAltitudeRef>190/100</exif:GPSAltitudeRef>
         <exif:GPSAltitude>0/1000</exif:GPSAltitude>
         <exif:GPSTimeStamp>2018-08-02T07:26:43Z</exif:GPSTimeStamp>
         <exif:GPSImgDirectionRef>M</exif:GPSImgDirectionRef>
         <exif:GPSImgDirection>14/1</exif:GPSImgDirection>
         <exif:GPSProcessingMethods>NETWORK</exif:GPSProcessingMethods>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

OnePlus 5T 前置：

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<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:OPMedia="http://ns.oneplus.com/media/1.0"
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <OPMedia:CaptureMode>Photo</OPMedia:CaptureMode>
         <OPMedia:IsHDRActive>False</OPMedia:IsHDRActive>
         <OPMedia:LensFacing>Front</OPMedia:LensFacing>
         <xmp:CreatorTool>OnePlus5T-user 8.1.0 OPM1.171019.011 87 release-keys</xmp:CreatorTool>
         <xmp:ModifyDate>2018-07-31T10:53:50.002856</xmp:ModifyDate>
         <xmp:CreateDate>2018-07-31T10:53:50</xmp:CreateDate>
         <xmp:MetadataDate>2018-07-31T10:53:50.002856</xmp:MetadataDate>
         <photoshop:DateCreated>2018-07-31T10:53:48.561032704</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>3341B1440498773B1C38052765AA3CC1</xmpMM:DocumentID>
         <xmpMM:InstanceID>3341B1440498773B1C38052765AA3CC1</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>3456</tiff:ImageWidth>
         <tiff:ImageLength>4608</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>OnePlus</tiff:Make>
         <tiff:Model>ONEPLUS A5010</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>3456</exif:PixelXDimension>
         <exif:PixelYDimension>4608</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-07-31T10:53:50</exif:DateTimeOriginal>
         <exif:ExposureTime>1/25</exif:ExposureTime>
         <exif:FNumber>200/100</exif:FNumber>
         <exif:ExposureProgram>0</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>200</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>4643/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>2000000/1000000</exif:ApertureValue>
         <exif:BrightnessValue>0/100</exif:BrightnessValue>
         <exif:MeteringMode>0</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>2</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>3519/1000</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>20</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>002856</exif:SubSecTime>
         <exif:SubSecTimeOriginal>002856</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>002856</exif:SubSecTimeDigitized>
         <exif:GPSLatitude>31,12.6128N</exif:GPSLatitude>
         <exif:GPSLongitude>121,27.4536E</exif:GPSLongitude>
         <exif:GPSAltitudeRef>0</exif:GPSAltitudeRef>
         <exif:GPSAltitude>0/1000</exif:GPSAltitude>
         <exif:GPSTimeStamp>2018-07-31T02:53:48Z</exif:GPSTimeStamp>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

OnePlus 5T 后置:

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<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:OPMedia="http://ns.oneplus.com/media/1.0"
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <OPMedia:CaptureMode>Photo</OPMedia:CaptureMode>
         <OPMedia:Scene>AutoHDR</OPMedia:Scene>
         <OPMedia:IsHDRActive>False</OPMedia:IsHDRActive>
         <OPMedia:LensFacing>Back</OPMedia:LensFacing>
         <xmp:CreatorTool>OnePlus5T-user 8.1.0 OPM1.171019.011 87 release-keys</xmp:CreatorTool>
         <xmp:ModifyDate>2018-07-30T17:02:51.100627</xmp:ModifyDate>
         <xmp:CreateDate>2018-07-30T17:02:51</xmp:CreateDate>
         <xmp:MetadataDate>2018-07-30T17:02:51.100627</xmp:MetadataDate>
         <photoshop:DateCreated>2018-07-30T17:02:52.842752192</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>9FE8455EBCFE4DD43B7C0F1A77AE16AD</xmpMM:DocumentID>
         <xmpMM:InstanceID>9FE8455EBCFE4DD43B7C0F1A77AE16AD</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>2304</tiff:ImageWidth>
         <tiff:ImageLength>4608</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:Orientation>0</tiff:Orientation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>OnePlus</tiff:Make>
         <tiff:Model>ONEPLUS A5010</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>2304</exif:PixelXDimension>
         <exif:PixelYDimension>4608</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-07-30T17:02:51</exif:DateTimeOriginal>
         <exif:ExposureTime>1/33</exif:ExposureTime>
         <exif:FNumber>170/100</exif:FNumber>
         <exif:ExposureProgram>0</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>1000</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>5058/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>1531069/1000000</exif:ApertureValue>
         <exif:BrightnessValue>-222/100</exif:BrightnessValue>
         <exif:MeteringMode>0</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>2</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>4103/1000</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>24</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>100627</exif:SubSecTime>
         <exif:SubSecTimeOriginal>100627</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>100627</exif:SubSecTimeDigitized>
         <exif:GPSLatitude>31,12.6128N</exif:GPSLatitude>
         <exif:GPSLongitude>121,27.4536E</exif:GPSLongitude>
         <exif:GPSAltitudeRef>0</exif:GPSAltitudeRef>
         <exif:GPSAltitude>0/1000</exif:GPSAltitude>
         <exif:GPSTimeStamp>2018-07-30T09:02:50Z</exif:GPSTimeStamp>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

可以看出，一加自己定义了一个XML标签，并且使用该标签写入了自己的数据,其中<OPMedia:LensFacing>Back</OPMedia:LensFacing>便是我们寻找的，键LensFacing对应的值为Back,表明这张图片使用后置摄像头拍摄，那么是不是所有的机型都有写入这个信息呢？下面是其他机型拍摄的照片的元数据：
OnePlus 6 前置：

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<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:OPMedia="http://ns.oneplus.com/media/1.0"
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <OPMedia:CaptureMode>Photo</OPMedia:CaptureMode>
         <OPMedia:Scene>AutoHDR</OPMedia:Scene>
         <OPMedia:IsHDRActive>False</OPMedia:IsHDRActive>
         <OPMedia:LensFacing>Front</OPMedia:LensFacing>
         <xmp:ModifyDate>2018-08-01T09:57:04.333801</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-01T09:57:04</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-01T09:57:04.333801</xmp:MetadataDate>
         <photoshop:DateCreated>2018-08-01T09:57:02.793550912</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>037F51FB2EE58CABACEA2D3E5655CECB</xmpMM:DocumentID>
         <xmpMM:InstanceID>037F51FB2EE58CABACEA2D3E5655CECB</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>4608</tiff:ImageWidth>
         <tiff:ImageLength>3456</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:Orientation>1</tiff:Orientation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>OnePlus</tiff:Make>
         <tiff:Model>ONEPLUS A6000</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>4608</exif:PixelXDimension>
         <exif:PixelYDimension>3456</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-01T09:57:04</exif:DateTimeOriginal>
         <exif:ExposureTime>500/10000</exif:ExposureTime>
         <exif:FNumber>20000/10000</exif:FNumber>
         <exif:ExposureProgram>2</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>500</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>5058/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>2000000/1000000</exif:ApertureValue>
         <exif:BrightnessValue>-316/100</exif:BrightnessValue>
         <exif:ExposureBiasValue>0/6</exif:ExposureBiasValue>
         <exif:MaxApertureValue>153/100</exif:MaxApertureValue>
         <exif:MeteringMode>1</exif:MeteringMode>
         <exif:LightSource>0</exif:LightSource>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>3</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>3480/1000</exif:FocalLength>
         <exif:SensingMethod>1</exif:SensingMethod>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>25</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>333801</exif:SubSecTime>
         <exif:SubSecTimeOriginal>333801</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>333801</exif:SubSecTimeDigitized>
         <exif:GPSLatitude>31,12.7098</exif:GPSLatitude>
         <exif:GPSLongitude>121,27.4435E</exif:GPSLongitude>
         <exif:GPSAltitudeRef>0</exif:GPSAltitudeRef>
         <exif:GPSAltitude>0/1000</exif:GPSAltitude>
         <exif:GPSTimeStamp>2018-08-01T01:57:04Z</exif:GPSTimeStamp>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

OnePlus 6 后置：

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<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:OPMedia="http://ns.oneplus.com/media/1.0"
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <OPMedia:CaptureMode>Photo</OPMedia:CaptureMode>
         <OPMedia:Scene>AutoHDR</OPMedia:Scene>
         <OPMedia:IsHDRActive>False</OPMedia:IsHDRActive>
         <OPMedia:LensFacing>Back</OPMedia:LensFacing>
         <xmp:ModifyDate>2018-05-25T17:21:18.333801</xmp:ModifyDate>
         <xmp:CreateDate>2018-05-25T17:21:18</xmp:CreateDate>
         <xmp:MetadataDate>2018-05-25T17:21:18.333801</xmp:MetadataDate>
         <photoshop:DateCreated>2018-05-25T17:21:16.793550912</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>2C0E6CBC34D567743E5B9DF66D8FF4AF</xmpMM:DocumentID>
         <xmpMM:InstanceID>2C0E6CBC34D567743E5B9DF66D8FF4AF</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>4608</tiff:ImageWidth>
         <tiff:ImageLength>3456</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:Orientation>1</tiff:Orientation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>OnePlus</tiff:Make>
         <tiff:Model>ONEPLUS A6000</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>4608</exif:PixelXDimension>
         <exif:PixelYDimension>3456</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-05-25T17:21:18</exif:DateTimeOriginal>
         <exif:ExposureTime>100/10000</exif:ExposureTime>
         <exif:FNumber>17000/10000</exif:FNumber>
         <exif:ExposureProgram>2</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>400</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>5058/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>1531069/1000000</exif:ApertureValue>
         <exif:BrightnessValue>-316/100</exif:BrightnessValue>
         <exif:ExposureBiasValue>0/6</exif:ExposureBiasValue>
         <exif:MaxApertureValue>153/100</exif:MaxApertureValue>
         <exif:MeteringMode>1</exif:MeteringMode>
         <exif:LightSource>0</exif:LightSource>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>3</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>4250/1000</exif:FocalLength>
         <exif:SensingMethod>1</exif:SensingMethod>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>25</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>333801</exif:SubSecTime>
         <exif:SubSecTimeOriginal>333801</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>333801</exif:SubSecTimeDigitized>
         <exif:GPSLatitude>31,12.7104</exif:GPSLatitude>
         <exif:GPSLongitude>121,27.4342E</exif:GPSLongitude>
         <exif:GPSAltitudeRef>0</exif:GPSAltitudeRef>
         <exif:GPSAltitude>0/1000</exif:GPSAltitude>
         <exif:GPSTimeStamp>2018-05-25T09:21:18Z</exif:GPSTimeStamp>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

vivo X9 前置:

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<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <xmp:CreatorTool>msm8953_64-user 7.1.2 N2G47H eng.compil.20180716.175053 release-keys</xmp:CreatorTool>
         <xmp:ModifyDate>2018-08-02T14:48:40.675561</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-02T14:48:40</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-02T14:48:40.675561</xmp:MetadataDate>
         <photoshop:DateCreated>2018-08-02T14:48:41.251134528</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>37EE2F012E274C22C2D5506C2A1902CF</xmpMM:DocumentID>
         <xmpMM:InstanceID>37EE2F012E274C22C2D5506C2A1902CF</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>3840</tiff:ImageWidth>
         <tiff:ImageLength>5120</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>vivo</tiff:Make>
         <tiff:Model>vivo X9</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>3840</exif:PixelXDimension>
         <exif:PixelYDimension>5120</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-02T14:48:40</exif:DateTimeOriginal>
         <exif:ExposureTime>10/333</exif:ExposureTime>
         <exif:FNumber>200/100</exif:FNumber>
         <exif:ExposureProgram>0</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>311</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>5058/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>2000000/1000000</exif:ApertureValue>
         <exif:BrightnessValue>59/100</exif:BrightnessValue>
         <exif:MeteringMode>2</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>0</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>387/100</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>26</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>675561</exif:SubSecTime>
         <exif:SubSecTimeOriginal>675561</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>675561</exif:SubSecTimeDigitized>
         <exif:GPSAltitudeRef>200/100</exif:GPSAltitudeRef>
         <exif:GPSTimeStamp>2018-08-02T06:48:40Z</exif:GPSTimeStamp>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

vivo X9 后置:

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9
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33
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35
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41
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47
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49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
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82
83
84
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <xmp:CreatorTool>msm8953_64-user 7.1.2 N2G47H eng.compil.20180716.175053 release-keys</xmp:CreatorTool>
         <xmp:ModifyDate>2018-08-02T14:48:14.666509</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-02T14:48:14</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-02T14:48:14.666509</xmp:MetadataDate>
         <photoshop:DateCreated>2018-08-02T14:48:14.78906912</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>5EFA5DBFD6539AE7059A28B40B79AEAE</xmpMM:DocumentID>
         <xmpMM:InstanceID>5EFA5DBFD6539AE7059A28B40B79AEAE</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>3456</tiff:ImageWidth>
         <tiff:ImageLength>4608</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>vivo</tiff:Make>
         <tiff:Model>vivo X9</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>3456</exif:PixelXDimension>
         <exif:PixelYDimension>4608</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-02T14:48:14</exif:DateTimeOriginal>
         <exif:ExposureTime>10/333</exif:ExposureTime>
         <exif:FNumber>200/100</exif:FNumber>
         <exif:ExposureProgram>0</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>320</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>5058/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>2000000/1000000</exif:ApertureValue>
         <exif:BrightnessValue>34/100</exif:BrightnessValue>
         <exif:MeteringMode>2</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>0</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>388/100</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>26</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>666509</exif:SubSecTime>
         <exif:SubSecTimeOriginal>666509</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>666509</exif:SubSecTimeDigitized>
         <exif:GPSAltitudeRef>200/100</exif:GPSAltitudeRef>
         <exif:GPSTimeStamp>2018-08-02T06:48:14Z</exif:GPSTimeStamp>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

Pixel 2 前置：

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80
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83
84
85
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97
98
99
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:GCamera="http://ns.google.com/photos/1.0/camera/"
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:aux="http://ns.adobe.com/exif/1.0/aux/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <GCamera:MicroVideo>1</GCamera:MicroVideo>
         <GCamera:MicroVideoVersion>1</GCamera:MicroVideoVersion>
         <GCamera:MicroVideoOffset>1691842</GCamera:MicroVideoOffset>
         <GCamera:MicroVideoPresentationTimestampUs>233612</GCamera:MicroVideoPresentationTimestampUs>
         <xmp:CreatorTool>HDR+ 1.0.198487984zb</xmp:CreatorTool>
         <xmp:ModifyDate>2018-08-02T14:41:39.404620</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-02T14:41:39</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-02T14:41:39.404620</xmp:MetadataDate>
         <aux:ApproximateFocusDistance>0/1</aux:ApproximateFocusDistance>
         <photoshop:DateCreated>2018-08-02T14:41:40.807294336</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>4B7EC3C4B26F6A5AF1C59D786A893518</xmpMM:DocumentID>
         <xmpMM:InstanceID>4B7EC3C4B26F6A5AF1C59D786A893518</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>3264</tiff:ImageWidth>
         <tiff:ImageLength>2448</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:Orientation>1</tiff:Orientation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>Google</tiff:Make>
         <tiff:Model>Pixel 2</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:PixelXDimension>3264</exif:PixelXDimension>
         <exif:PixelYDimension>2448</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-02T14:41:39</exif:DateTimeOriginal>
         <exif:ExposureTime>33333/1000000</exif:ExposureTime>
         <exif:FNumber>240/100</exif:FNumber>
         <exif:ExposureProgram>2</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>119</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>491/100</exif:ShutterSpeedValue>
         <exif:ApertureValue>2526069/1000000</exif:ApertureValue>
         <exif:BrightnessValue>218/100</exif:BrightnessValue>
         <exif:ExposureBiasValue>0/6</exif:ExposureBiasValue>
         <exif:MaxApertureValue>253/100</exif:MaxApertureValue>
         <exif:SubjectDistance>0/1</exif:SubjectDistance>
         <exif:MeteringMode>2</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>2</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>3380/1000</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:CustomRendered>1</exif:CustomRendered>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:DigitalZoomRatio>0/1</exif:DigitalZoomRatio>
         <exif:FocalLengthIn35mmFilm>25</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:Contrast>0</exif:Contrast>
         <exif:Saturation>0</exif:Saturation>
         <exif:Sharpness>0</exif:Sharpness>
         <exif:SubjectDistanceRange>0</exif:SubjectDistanceRange>
         <exif:SubSecTime>404620</exif:SubSecTime>
         <exif:SubSecTimeOriginal>404620</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>404620</exif:SubSecTimeDigitized>
         <exif:GPSVersionID>2.2.0.0</exif:GPSVersionID>
         <exif:GPSLatitude>31,12.826N</exif:GPSLatitude>
         <exif:GPSLongitude>121,27.1655E</exif:GPSLongitude>
         <exif:GPSAltitudeRef>0</exif:GPSAltitudeRef>
         <exif:GPSAltitude>3220/100</exif:GPSAltitude>
         <exif:GPSTimeStamp>2018-08-02T06:41:29Z</exif:GPSTimeStamp>
         <exif:GPSDOP>15812/1000</exif:GPSDOP>
         <exif:GPSProcessingMethods>fused</exif:GPSProcessingMethods>
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   </rdf:RDF>
</x:xmpmeta>

Pixel 2 后置：

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5
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13
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19
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31
32
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41
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44
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48
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50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
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75
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77
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83
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97
98
99
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
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      <rdf:Description rdf:about=""
            xmlns:GCamera="http://ns.google.com/photos/1.0/camera/"
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:aux="http://ns.adobe.com/exif/1.0/aux/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <GCamera:MicroVideo>1</GCamera:MicroVideo>
         <GCamera:MicroVideoVersion>1</GCamera:MicroVideoVersion>
         <GCamera:MicroVideoOffset>2470328</GCamera:MicroVideoOffset>
         <GCamera:MicroVideoPresentationTimestampUs>799652</GCamera:MicroVideoPresentationTimestampUs>
         <xmp:CreatorTool>HDR+ 1.0.198487984z</xmp:CreatorTool>
         <xmp:ModifyDate>2018-08-02T14:41:46.148686</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-02T14:41:46</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-02T14:41:46.148686</xmp:MetadataDate>
         <aux:ApproximateFocusDistance>588/1000</aux:ApproximateFocusDistance>
         <photoshop:DateCreated>2018-08-02T14:41:44.36214464</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>C6041F60CBB2044037D860457E7203A4</xmpMM:DocumentID>
         <xmpMM:InstanceID>C6041F60CBB2044037D860457E7203A4</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>3024</tiff:ImageWidth>
         <tiff:ImageLength>4032</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:Orientation>1</tiff:Orientation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>Google</tiff:Make>
         <tiff:Model>Pixel 2</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:PixelXDimension>3024</exif:PixelXDimension>
         <exif:PixelYDimension>4032</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-02T14:41:46</exif:DateTimeOriginal>
         <exif:ExposureTime>10002/1000000</exif:ExposureTime>
         <exif:FNumber>180/100</exif:FNumber>
         <exif:ExposureProgram>2</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>127</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>664/100</exif:ShutterSpeedValue>
         <exif:ApertureValue>1695994/1000000</exif:ApertureValue>
         <exif:BrightnessValue>299/100</exif:BrightnessValue>
         <exif:ExposureBiasValue>0/6</exif:ExposureBiasValue>
         <exif:MaxApertureValue>170/100</exif:MaxApertureValue>
         <exif:SubjectDistance>588/1000</exif:SubjectDistance>
         <exif:MeteringMode>2</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>2</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>4442/1000</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:CustomRendered>1</exif:CustomRendered>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:DigitalZoomRatio>0/1</exif:DigitalZoomRatio>
         <exif:FocalLengthIn35mmFilm>27</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:Contrast>0</exif:Contrast>
         <exif:Saturation>0</exif:Saturation>
         <exif:Sharpness>0</exif:Sharpness>
         <exif:SubjectDistanceRange>1</exif:SubjectDistanceRange>
         <exif:SubSecTime>148686</exif:SubSecTime>
         <exif:SubSecTimeOriginal>148686</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>148686</exif:SubSecTimeDigitized>
         <exif:GPSVersionID>2.2.0.0</exif:GPSVersionID>
         <exif:GPSLatitude>31,12.826N</exif:GPSLatitude>
         <exif:GPSLongitude>121,27.1655E</exif:GPSLongitude>
         <exif:GPSAltitudeRef>0</exif:GPSAltitudeRef>
         <exif:GPSAltitude>3220/100</exif:GPSAltitude>
         <exif:GPSTimeStamp>2018-08-02T06:41:29Z</exif:GPSTimeStamp>
         <exif:GPSDOP>15812/1000</exif:GPSDOP>
         <exif:GPSProcessingMethods>fused</exif:GPSProcessingMethods>
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红米 5 Plus 前置：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
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79
80
81
82
83
84
85
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
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      <rdf:Description rdf:about=""
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            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <xmp:CreatorTool>vince-user 7.1.2 N2G47H 8.7.12 release-keys</xmp:CreatorTool>
         <xmp:ModifyDate>2018-08-02T15:50:10.111306</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-02T15:50:10</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-02T15:50:10.111306</xmp:MetadataDate>
         <photoshop:DateCreated>2018-08-02T15:50:09.636850304</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
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         <xmpMM:InstanceID>CDE79A1CEBA00CD1FC459DBA269EF0B4</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>1944</tiff:ImageWidth>
         <tiff:ImageLength>2592</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:Orientation>1</tiff:Orientation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>Xiaomi</tiff:Make>
         <tiff:Model>Redmi 5 Plus</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>2592</exif:PixelXDimension>
         <exif:PixelYDimension>1944</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-02T15:50:10</exif:DateTimeOriginal>
         <exif:ExposureTime>1/33</exif:ExposureTime>
         <exif:FNumber>200/100</exif:FNumber>
         <exif:ExposureProgram>0</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>242</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>5058/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>2000000/1000000</exif:ApertureValue>
         <exif:BrightnessValue>62/100</exif:BrightnessValue>
         <exif:MeteringMode>2</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>2</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>2639/1000</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>3</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>111306</exif:SubSecTime>
         <exif:SubSecTimeOriginal>111306</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>111306</exif:SubSecTimeDigitized>
         <exif:GPSAltitudeRef>200/100</exif:GPSAltitudeRef>
         <exif:GPSTimeStamp>2018-08-02T07:50:09Z</exif:GPSTimeStamp>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

红米 5 Plus 后置：

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<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c142 79.160924, 2017/07/13-01:06:39        ">
   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
      <rdf:Description rdf:about=""
            xmlns:xmp="http://ns.adobe.com/xap/1.0/"
            xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
            xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
            xmlns:exif="http://ns.adobe.com/exif/1.0/">
         <xmp:CreatorTool>vince-user 7.1.2 N2G47H 8.7.12 release-keys</xmp:CreatorTool>
         <xmp:ModifyDate>2018-08-02T15:49:54.799201</xmp:ModifyDate>
         <xmp:CreateDate>2018-08-02T15:49:54</xmp:CreateDate>
         <xmp:MetadataDate>2018-08-02T15:49:54.799201</xmp:MetadataDate>
         <photoshop:DateCreated>2018-08-02T15:49:54.337082944</photoshop:DateCreated>
         <photoshop:ColorMode>3</photoshop:ColorMode>
         <photoshop:ICCProfile>sRGB IEC61966-2.1</photoshop:ICCProfile>
         <xmpMM:DocumentID>DCE86D08DEBFAFC48F5631CDA52CCB7E</xmpMM:DocumentID>
         <xmpMM:InstanceID>DCE86D08DEBFAFC48F5631CDA52CCB7E</xmpMM:InstanceID>
         <dc:format>image/jpeg</dc:format>
         <tiff:ImageWidth>3000</tiff:ImageWidth>
         <tiff:ImageLength>4000</tiff:ImageLength>
         <tiff:BitsPerSample>
            <rdf:Seq>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
               <rdf:li>8</rdf:li>
            </rdf:Seq>
         </tiff:BitsPerSample>
         <tiff:PhotometricInterpretation>2</tiff:PhotometricInterpretation>
         <tiff:Orientation>1</tiff:Orientation>
         <tiff:SamplesPerPixel>3</tiff:SamplesPerPixel>
         <tiff:YCbCrPositioning>1</tiff:YCbCrPositioning>
         <tiff:XResolution>72/1</tiff:XResolution>
         <tiff:YResolution>72/1</tiff:YResolution>
         <tiff:ResolutionUnit>2</tiff:ResolutionUnit>
         <tiff:Make>Xiaomi</tiff:Make>
         <tiff:Model>Redmi 5 Plus</tiff:Model>
         <exif:ExifVersion>0220</exif:ExifVersion>
         <exif:FlashpixVersion>0100</exif:FlashpixVersion>
         <exif:ColorSpace>1</exif:ColorSpace>
         <exif:ComponentsConfiguration>
            <rdf:Seq>
               <rdf:li>1</rdf:li>
               <rdf:li>2</rdf:li>
               <rdf:li>3</rdf:li>
               <rdf:li>0</rdf:li>
            </rdf:Seq>
         </exif:ComponentsConfiguration>
         <exif:PixelXDimension>4000</exif:PixelXDimension>
         <exif:PixelYDimension>3000</exif:PixelYDimension>
         <exif:DateTimeOriginal>2018-08-02T15:49:54</exif:DateTimeOriginal>
         <exif:ExposureTime>1/50</exif:ExposureTime>
         <exif:FNumber>220/100</exif:FNumber>
         <exif:ExposureProgram>0</exif:ExposureProgram>
         <exif:ISOSpeedRatings>
            <rdf:Seq>
               <rdf:li>400</rdf:li>
            </rdf:Seq>
         </exif:ISOSpeedRatings>
         <exif:ShutterSpeedValue>5643/1000</exif:ShutterSpeedValue>
         <exif:ApertureValue>2275007/1000000</exif:ApertureValue>
         <exif:BrightnessValue>96/100</exif:BrightnessValue>
         <exif:MeteringMode>2</exif:MeteringMode>
         <exif:Flash rdf:parseType="Resource">
            <exif:Fired>False</exif:Fired>
            <exif:Return>0</exif:Return>
            <exif:Mode>2</exif:Mode>
            <exif:Function>False</exif:Function>
            <exif:RedEyeMode>False</exif:RedEyeMode>
         </exif:Flash>
         <exif:FocalLength>3819/1000</exif:FocalLength>
         <exif:SensingMethod>2</exif:SensingMethod>
         <exif:SceneType>1</exif:SceneType>
         <exif:ExposureMode>0</exif:ExposureMode>
         <exif:WhiteBalance>0</exif:WhiteBalance>
         <exif:FocalLengthIn35mmFilm>26</exif:FocalLengthIn35mmFilm>
         <exif:SceneCaptureType>0</exif:SceneCaptureType>
         <exif:SubSecTime>799201</exif:SubSecTime>
         <exif:SubSecTimeOriginal>799201</exif:SubSecTimeOriginal>
         <exif:SubSecTimeDigitized>799201</exif:SubSecTimeDigitized>
         <exif:GPSAltitudeRef>220/100</exif:GPSAltitudeRef>
         <exif:GPSTimeStamp>2018-08-02T07:49:54Z</exif:GPSTimeStamp>
      </rdf:Description>
   </rdf:RDF>
</x:xmpmeta>

一加可行

由上面的结果可知，目前只有一加在自定义属性中添加了LensFacing用来标记前后置摄像头，其余机型均为有相应字段用来标记前后置摄像头，所以在编码时只针对一加进行编码就行，若后续有其他机型也增加了标记字段，则进行补充编码即可。

编码进行时

由于时间紧迫，加上重复造轮子过于复杂和耗时，我选择了metadata-extractor这个库，具体使用与示例请参照对应wiki及源码，这里贴个简陋的Demo的MainActivity

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package com.kaithmy.metadatademo

import android.content.Intent
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import android.widget.Toast
import com.adobe.xmp.properties.XMPPropertyInfo
import com.drew.imaging.ImageMetadataReader
import com.drew.metadata.xmp.XmpDirectory
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    val IMAGE_PICKER_REQUESTCODE = 10086

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)

        fab.setOnClickListener { view ->
            val intent = Intent(Intent.ACTION_GET_CONTENT)
            intent.type = "image/*"
            startActivityForResult(intent, IMAGE_PICKER_REQUESTCODE)
        }
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        // Inflate the menu; this adds items to the action bar if it is present.
        menuInflater.inflate(R.menu.menu_main, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        return when (item.itemId) {
            R.id.action_settings -> true
            else -> super.onOptionsItemSelected(item)
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (requestCode == IMAGE_PICKER_REQUESTCODE) {
            if (data == null) return
            val uri = data.data
            try {
                val openInputStream = contentResolver.openInputStream(uri)
                val metadata = ImageMetadataReader.readMetadata(openInputStream)
                val xmpDirectory = metadata.getDirectoriesOfType(XmpDirectory::class.java)
                xmpDirectory.forEach {
                    val xmpMeta = it.xmpMeta
                    for (any in xmpMeta) {
                        if (any is XMPPropertyInfo && "OPMedia:LensFacing" == any.path) {
                            if ("Front" == any.value) {
                                Toast.makeText(this, "Front", Toast.LENGTH_LONG).show()
                            }
                            if ("Back" == any.value) {
                                Toast.makeText(this, "Back", Toast.LENGTH_LONG).show()
                            }
                        }
                    }
                }
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }
    }
}

突发情况？

程序在其他手机上跑的好好的，突然在魅族6 Note上突然崩溃了，报错信息如下：

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E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.kaithmy.metadatademo, PID: 26896
                  java.lang.NoSuchMethodError: No interface method getValue()Ljava/lang/String; in class Lcom/adobe/xmp/properties/XMPPropertyInfo; or its super classes (declaration of 'com.adobe.xmp.properties.XMPPropertyInfo' appears in /system/framework/framework.jar:classes2.dex)
                      at com.kaithmy.metadatademo.MainActivity.onActivityResult(MainActivity.kt:57)
                      at android.app.Activity.dispatchActivityResult(Activity.java:7060)
                      at android.app.ActivityThread.deliverResults(ActivityThread.java:4279)
                      at android.app.ActivityThread.handleSendResult(ActivityThread.java:4326)
                      at android.app.ActivityThread.-wrap20(ActivityThread.java)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1640)
                      at android.os.Handler.dispatchMessage(Handler.java:102)
                      at android.os.Looper.loop(Looper.java:154)
                      at android.app.ActivityThread.main(ActivityThread.java:6321)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:939)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:829)

接口类方法getValue找不到？，吓得我赶紧点进去看了看

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// =================================================================================================
// ADOBE SYSTEMS INCORPORATED
// Copyright 2006 Adobe Systems Incorporated
// All Rights Reserved
//
// NOTICE:  Adobe permits you to use, modify, and distribute this file in accordance with the terms
// of the Adobe license agreement accompanying it.
// =================================================================================================

package com.adobe.xmp.properties;

import com.adobe.xmp.options.PropertyOptions;


/**
 * This interface is used to return a property together with its path and namespace.
 * It is returned when properties are iterated with the <code>XMPIterator</code>.
 * 
 * @since   06.07.2006
 */
public interface XMPPropertyInfo extends XMPProperty
{
	/**
	 * @return Returns the namespace of the property
	 */
	String getNamespace();

	
	/**
	 * @return Returns the path of the property, but only if returned by the iterator.
	 */
	String getPath();

	
	/**
	 * @return Returns the value of the property.
	 */
	String getValue();
	
	
	/**
	 * @return Returns the options of the property.
	 */
	PropertyOptions getOptions();
}

其中getValue()和getOptions()继承自接口XMPProperty

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// =================================================================================================
// ADOBE SYSTEMS INCORPORATED
// Copyright 2006 Adobe Systems Incorporated
// All Rights Reserved
//
// NOTICE:  Adobe permits you to use, modify, and distribute this file in accordance with the terms
// of the Adobe license agreement accompanying it.
// =================================================================================================

package com.adobe.xmp.properties;

import com.adobe.xmp.XMPMeta;
import com.adobe.xmp.options.PropertyOptions;


/**
 * This interface is used to return a text property together with its and options.
 * 
 * @since   23.01.2006
 */
public interface XMPProperty 
{
	/**
	 * @return Returns the value of the property.
	 */
	String getValue();
	
	
	/**
	 * @return Returns the options of the property.
	 */
	PropertyOptions getOptions();
	
	
	/**
	 * Only set by {@link XMPMeta#getLocalizedText(String, String, String, String)}. 
	 * @return Returns the language of the alt-text item.
	 */
	String getLanguage();
}

明明有啊，这不坑爹嘛这是！难道是混淆了？于是在混淆配置文件中添加了-keep class com.adobe.xmp.** { *; }，结果还是没用。查看一下生成的apk中的dex里有没有

是有的，那为什么会找不到呢？看了看错误中的/system/framework/framework.jar，立即将framework.jar从手机中导了出来，但是里面居然是空的，只有个文件夹META-INF中包含一个MANIFEST.MF文件，那么问题也不在这里。仔细想了想，会不会是因为是魅族改过framework层呢，或者说是手机被root过而受了影响呢？于是乎借了一部root过的Nexus 5装上了验证Demo进行测试，结果是能正常运行并展示结果，由此排除了受root而导致的接口方法找不到。

结语

基于以上验证结果，浅显地认为是魅族的ROM导致的吧ㄟ( ▔, ▔ )ㄏ

博主 wechat
冰糖可乐柠檬茶，可爱的女士喝点啥？喝点啥？
喜欢的话就给予一点支持吧(*/ω＼*)