Android 4.4 前后版本读取图库图片和拍照完美解决方案-获取文件路径

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文章出处:http://blog.csdn.net/zbjdsbj/article/details/42387551

4.3或以下,选了图片之后,根据Uri来做处理,很多帖子都有了,我就不详细说了.主要是4.4,如果使用上面pick的原生方法来选图,返回的uri还是正常的,但如果用ACTION_GET_CONTENT的方法,返回的uri跟4.3是完全不一样的,4.3返回的是带文件路径的,而4.4返回的却是content://com.android.providers.media.documents/document/image:3951这样的,没有路径,只有图片编号的uri.这就导致接下来无法根据图片路径来裁剪的步骤了.

来自overflow大牛的方法,4.4得到的uri,需要以下方法来获取文件的路径:


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  1. /**  
  2.  * <br>功能简述:4.4及以上获取图片的方法 
  3.  * <br>功能详细描述: 
  4.  * <br>注意: 
  5.  * @param context 
  6.  * @param uri 
  7.  * @return 
  8.  */  
  9. @TargetApi(Build.VERSION_CODES.KITKAT)  
  10. public static String getPath(final Context context, final Uri uri) {  
  11.   
  12.     final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;  
  13.   
  14.     // DocumentProvider  
  15.     if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {  
  16.         // ExternalStorageProvider  
  17.         if (isExternalStorageDocument(uri)) {  
  18.             final String docId = DocumentsContract.getDocumentId(uri);  
  19.             final String[] split = docId.split(“:”);  
  20.             final String type = split[0];  
  21.   
  22.             if (“primary”.equalsIgnoreCase(type)) {  
  23.                 return Environment.getExternalStorageDirectory() + “/” + split[1];  
  24.             }  
  25.         }  
  26.         // DownloadsProvider  
  27.         else if (isDownloadsDocument(uri)) {  
  28.   
  29.             final String id = DocumentsContract.getDocumentId(uri);  
  30.             final Uri contentUri = ContentUris.withAppendedId(  
  31.                     Uri.parse(”content://downloads/public_downloads”), Long.valueOf(id));  
  32.   
  33.             return getDataColumn(context, contentUri, nullnull);  
  34.         }  
  35.         // MediaProvider  
  36.         else if (isMediaDocument(uri)) {  
  37.             final String docId = DocumentsContract.getDocumentId(uri);  
  38.             final String[] split = docId.split(“:”);  
  39.             final String type = split[0];  
  40.   
  41.             Uri contentUri = null;  
  42.             if (“image”.equals(type)) {  
  43.                 contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;  
  44.             } else if (“video”.equals(type)) {  
  45.                 contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;  
  46.             } else if (“audio”.equals(type)) {  
  47.                 contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;  
  48.             }  
  49.   
  50.             final String selection = “_id=?”;  
  51.             final String[] selectionArgs = new String[] { split[1] };  
  52.   
  53.             return getDataColumn(context, contentUri, selection, selectionArgs);  
  54.         }  
  55.     }  
  56.     // MediaStore (and general)  
  57.     else if (“content”.equalsIgnoreCase(uri.getScheme())) {  
  58.   
  59.         // Return the remote address  
  60.         if (isGooglePhotosUri(uri))  
  61.             return uri.getLastPathSegment();  
  62.   
  63.         return getDataColumn(context, uri, nullnull);  
  64.     }  
  65.     // File  
  66.     else if (“file”.equalsIgnoreCase(uri.getScheme())) {  
  67.         return uri.getPath();  
  68.     }  
  69.   
  70.     return null;  
  71. }  
  72.   
  73. public static String getDataColumn(Context context, Uri uri, String selection,  
  74.         String[] selectionArgs) {  
  75.   
  76.     Cursor cursor = null;  
  77.     final String column = “_data”;  
  78.     final String[] projection = { column };  
  79.   
  80.     try {  
  81.         cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,  
  82.                 null);  
  83.         if (cursor != null && cursor.moveToFirst()) {  
  84.             final int index = cursor.getColumnIndexOrThrow(column);  
  85.             return cursor.getString(index);  
  86.         }  
  87.     } finally {  
  88.         if (cursor != null)  
  89.             cursor.close();  
  90.     }  
  91.     return null;  
  92. }  
  93.   
  94. /** 
  95.  * @param uri The Uri to check. 
  96.  * @return Whether the Uri authority is ExternalStorageProvider. 
  97.  */  
  98. public static boolean isExternalStorageDocument(Uri uri) {  
  99.     return “com.android.externalstorage.documents”.equals(uri.getAuthority());  
  100. }  
  101.   
  102. /** 
  103.  * @param uri The Uri to check. 
  104.  * @return Whether the Uri authority is DownloadsProvider. 
  105.  */  
  106. public static boolean isDownloadsDocument(Uri uri) {  
  107.     return “com.android.providers.downloads.documents”.equals(uri.getAuthority());  
  108. }  
  109.   
  110. /** 
  111.  * @param uri The Uri to check. 
  112.  * @return Whether the Uri authority is MediaProvider. 
  113.  */  
  114. public static boolean isMediaDocument(Uri uri) {  
  115.     return “com.android.providers.media.documents”.equals(uri.getAuthority());  
  116. }  
  117.   
  118. /** 
  119.  * @param uri The Uri to check. 
  120.  * @return Whether the Uri authority is Google Photos. 
  121.  */  
  122. public static boolean isGooglePhotosUri(Uri uri) {  
  123.     return “com.google.android.apps.photos.content”.equals(uri.getAuthority());  
  124. }</span></span>  
 /**      * <br>功能简述:4.4及以上获取图片的方法     * <br>功能详细描述:     * <br>注意:     * @param context     * @param uri     * @return     */    @TargetApi(Build.VERSION_CODES.KITKAT)    public static String getPath(final Context context, final Uri uri) {        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;        // DocumentProvider        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {            // ExternalStorageProvider            if (isExternalStorageDocument(uri)) {                final String docId = DocumentsContract.getDocumentId(uri);                final String[] split = docId.split(":");                final String type = split[0];                if ("primary".equalsIgnoreCase(type)) {                    return Environment.getExternalStorageDirectory() + "/" + split[1];                }            }            // DownloadsProvider            else if (isDownloadsDocument(uri)) {                final String id = DocumentsContract.getDocumentId(uri);                final Uri contentUri = ContentUris.withAppendedId(                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));                return getDataColumn(context, contentUri, null, null);            }            // MediaProvider            else if (isMediaDocument(uri)) {                final String docId = DocumentsContract.getDocumentId(uri);                final String[] split = docId.split(":");                final String type = split[0];                Uri contentUri = null;                if ("image".equals(type)) {                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;                } else if ("video".equals(type)) {                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;                } else if ("audio".equals(type)) {                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;                }                final String selection = "_id=?";                final String[] selectionArgs = new String[] { split[1] };                return getDataColumn(context, contentUri, selection, selectionArgs);            }        }        // MediaStore (and general)        else if ("content".equalsIgnoreCase(uri.getScheme())) {            // Return the remote address            if (isGooglePhotosUri(uri))                return uri.getLastPathSegment();            return getDataColumn(context, uri, null, null);        }        // File        else if ("file".equalsIgnoreCase(uri.getScheme())) {            return uri.getPath();        }        return null;    }    public static String getDataColumn(Context context, Uri uri, String selection,            String[] selectionArgs) {        Cursor cursor = null;        final String column = "_data";        final String[] projection = { column };        try {            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,                    null);            if (cursor != null && cursor.moveToFirst()) {                final int index = cursor.getColumnIndexOrThrow(column);                return cursor.getString(index);            }        } finally {            if (cursor != null)                cursor.close();        }        return null;    }    /**     * @param uri The Uri to check.     * @return Whether the Uri authority is ExternalStorageProvider.     */    public static boolean isExternalStorageDocument(Uri uri) {        return "com.android.externalstorage.documents".equals(uri.getAuthority());    }    /**     * @param uri The Uri to check.     * @return Whether the Uri authority is DownloadsProvider.     */    public static boolean isDownloadsDocument(Uri uri) {        return "com.android.providers.downloads.documents".equals(uri.getAuthority());    }    /**     * @param uri The Uri to check.     * @return Whether the Uri authority is MediaProvider.     */    public static boolean isMediaDocument(Uri uri) {        return "com.android.providers.media.documents".equals(uri.getAuthority());    }    /**     * @param uri The Uri to check.     * @return Whether the Uri authority is Google Photos.     */    public static boolean isGooglePhotosUri(Uri uri) {        return "com.google.android.apps.photos.content".equals(uri.getAuthority());    }</span></span>


为什么会不一样呢?

Android 4.4(含)开始,通过方式访问图库后,返回的Uri如下(访问“最近”):
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  1. Uri is:content://com.android.providers.media.documents/document/image%3A18838  
  2. 2 Uri.getPath is :/document/image:18838  
  3. 3 对应的图片真实路径:/storage/emulated/0/Pictures/Screenshots/Screenshot_2014-09-22-21-40-53.png</span>  
Uri is:content://com.android.providers.media.documents/document/image%3A188382 Uri.getPath is :/document/image:188383 对应的图片真实路径:/storage/emulated/0/Pictures/Screenshots/Screenshot_2014-09-22-21-40-53.png</span>

不但如此,对于不同类型图库,返回的Uri形式并不相同(访问普通相册):

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  1. Uri is:content://media/external/images/media/18822  
  2. 2 Uri.getPath is :/external/images/media/18822  
  3. 3 对应的图片真实路径:/storage/emulated/0/Download/20130224235013.jpg</span>  
Uri is:content://media/external/images/media/188222 Uri.getPath is :/external/images/media/188223 对应的图片真实路径:/storage/emulated/0/Download/20130224235013.jpg</span>

而4.4之前返回的Uri只存在一种形式,如下:

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  1. Uri is:content://media/external/images/media/14046  
  2. 2 Uri.getPath is :/external/images/media/14046  
  3. 3 对应的图片真实路径:/storage/emulated/0/DCIM/Camera/20130224235013.jpg  
Uri is:content://media/external/images/media/140462 Uri.getPath is :/external/images/media/140463 对应的图片真实路径:/storage/emulated/0/DCIM/Camera/20130224235013.jpg

因此,在Android 4.4或更高版本设备上,通过简单的getDataColumn(Context, Uri, null, null)进行图片数据库已经不能满足所有需求,因此在获取图片真实路径的时候需要根据不同类型区分对待。

版本判断:

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  1. //版本比较:是否是4.4及以上版本  
  2.     final boolean mIsKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;  
//版本比较:是否是4.4及以上版本    final boolean mIsKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

从相册选择照片方法比较:

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  1. /**  
  2.      * <br>功能简述:4.4及以上从相册选择照片 
  3.      * <br>功能详细描述: 
  4.      * <br>注意: 
  5.      */  
  6.     @TargetApi(Build.VERSION_CODES.KITKAT)  
  7.     private void SelectImageUriAfterKikat() {  
  8.         Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);  
  9.         intent.addCategory(Intent.CATEGORY_OPENABLE);  
  10.         intent.setType(”image/*”);  
  11.         startActivityForResult(intent, SELECET_A_PICTURE_AFTER_KIKAT);  
  12.     }  
/**      * <br>功能简述:4.4及以上从相册选择照片     * <br>功能详细描述:     * <br>注意:     */    @TargetApi(Build.VERSION_CODES.KITKAT)    private void SelectImageUriAfterKikat() {        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);        intent.addCategory(Intent.CATEGORY_OPENABLE);        intent.setType("image/*");        startActivityForResult(intent, SELECET_A_PICTURE_AFTER_KIKAT);    }


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  1. /  
  2.       <br>功能简述:4.4以下从相册选照片并剪切 
  3.       <br>功能详细描述: 
  4.       <br>注意: 
  5.      /  
  6.     private void cropImageUri() {  
  7.         Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);  
  8.         intent.setType(”image/*”);  
  9.         intent.putExtra(”crop”“true”);  
  10.         intent.putExtra(”aspectX”, 1);  
  11.         intent.putExtra(”aspectY”, 1);  
  12.         intent.putExtra(”outputX”, 640);  
  13.         intent.putExtra(”outputY”, 640);  
  14.         intent.putExtra(”scale”true);  
  15.         intent.putExtra(”return-data”false);  
  16.         intent.putExtra(MediaStore.EXTRA_OUTPUT,  
  17.                 Uri.fromFile(new File(IMGPATH, TMP_IMAGE_FILE_NAME)));  
  18.         intent.putExtra(”outputFormat”, Bitmap.CompressFormat.JPEG.toString());  
  19.         intent.putExtra(”noFaceDetection”true); // no face detection  
  20.         startActivityForResult(intent, SELECT_A_PICTURE);  
  21.     }  
/  
* <br>功能简述:4.4以下从相册选照片并剪切
* <br>功能详细描述:
* <br>注意:
*/
private void cropImageUri() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
intent.setType("image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 640);
intent.putExtra("outputY", 640);
intent.putExtra("scale", true);
intent.putExtra("return-data", false);
intent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(new File(IMGPATH, TMP_IMAGE_FILE_NAME)));
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true); // no face detection
startActivityForResult(intent, SELECT_A_PICTURE);
}

4.4及以上选取照片后需要调用剪切方法:
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  1. /  
  2.       <br>功能简述: 4.4及以上选取照片后剪切方法 
  3.       <br>功能详细描述: 
  4.       <br>注意: 
  5.       @param uri 
  6.      /  
  7.     private void cropImageUriAfterKikat(Uri uri) {  
  8.         Intent intent = new Intent(“com.android.camera.action.CROP”);  
  9.         intent.setDataAndType(uri, ”image/”);  
  10.         intent.putExtra(”crop”“true”);  
  11.         intent.putExtra(”aspectX”, 1);  
  12.         intent.putExtra(”aspectY”, 1);  
  13.         intent.putExtra(”outputX”, 640);  
  14.         intent.putExtra(”outputY”, 640);  
  15.         intent.putExtra(”scale”true);  
  16.         intent.putExtra(”return-data”true); //返回数据bitmap  
  17.         intent.putExtra(”outputFormat”, Bitmap.CompressFormat.JPEG.toString());  
  18.         intent.putExtra(”noFaceDetection”true); // no face detection  
  19.         startActivityForResult(intent, SET_ALBUM_PICTURE_KITKAT);  
  20.     }  
/  
* <br>功能简述: 4.4及以上选取照片后剪切方法
* <br>功能详细描述:
* <br>注意:
* @param uri
*/
private void cropImageUriAfterKikat(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 640);
intent.putExtra("outputY", 640);
intent.putExtra("scale", true);
intent.putExtra("return-data", true); //返回数据bitmap
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true); // no face detection
startActivityForResult(intent, SET_ALBUM_PICTURE_KITKAT);
}

拍照通用方法,对返回数据做处理:


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  1. /  
  2.       <br>功能简述:对拍照的图片剪切 
  3.       <br>功能详细描述: 
  4.       <br>注意: 
  5.       @param uri 
  6.      */  
  7.     private void cameraCropImageUri(Uri uri) {  
  8.         Intent intent = new Intent(“com.android.camera.action.CROP”);  
  9.         intent.setDataAndType(uri, ”image/jpeg”);  
  10.         intent.putExtra(”crop”“true”);  
  11.         intent.putExtra(”aspectX”, 1);  
  12.         intent.putExtra(”aspectY”, 1);  
  13.         intent.putExtra(”outputX”, 640);  
  14.         intent.putExtra(”outputY”, 640);  
  15.         intent.putExtra(”scale”true);  
  16.         if (mIsKitKat) {  
  17.             intent.putExtra(”return-data”true);  
  18.         } else {  
  19.             intent.putExtra(”return-data”false);  
  20.             intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);  
  21.         }  
  22.         intent.putExtra(”outputFormat”, Bitmap.CompressFormat.JPEG.toString());  
  23.         intent.putExtra(”noFaceDetection”true);  
  24.         startActivityForResult(intent, SET_PICTURE);  
  25.     }  
/  
* <br>功能简述:对拍照的图片剪切
* <br>功能详细描述:
* <br>注意:
* @param uri
*/
private void cameraCropImageUri(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/jpeg");
        intent.putExtra("crop", "true");
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        intent.putExtra("outputX", 640);
        intent.putExtra("outputY", 640);
        intent.putExtra("scale", true);
        if (mIsKitKat) {
            intent.putExtra("return-data", true);
        } else {
            intent.putExtra("return-data", false);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
        }
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
        intent.putExtra("noFaceDetection", true);
        startActivityForResult(intent, SET_PICTURE);
    }

显示等处理如下:
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  1. @Override  
  2.     protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
  3.         super.onActivityResult(requestCode, resultCode, data);  
  4.         if (requestCode == SELECT_A_PICTURE) {  
  5.             if (resultCode == RESULT_OK && null != data) {  
  6.                 Log.i(”zou”“4.4以下的”);  
  7.                 Bitmap bitmap = decodeUriAsBitmap(Uri.fromFile(new File(IMGPATH,  
  8.                         TMP_IMAGE_FILE_NAME)));  
  9.                 mAcountHeadIcon.setImageBitmap(bitmap);  
  10.             }  
  11.         } else if (requestCode == SELECET_A_PICTURE_AFTER_KIKAT) {  
  12.             if (resultCode == RESULT_OK && null != data) {  
  13.                 Log.i(”zou”“4.4以上上的”);  
  14.                 mAlbumPicturePath = getPath(MainActivity.this, data.getData());  
  15.                 cropImageUriAfterKikat(Uri.fromFile(new File(mAlbumPicturePath)));  
  16.             }  
  17.         } else if (requestCode == SET_ALBUM_PICTURE_KITKAT) {  
  18.             Log.i(”zou”“4.4以上上的 RESULT_OK”);  
  19.             Bitmap bitmap = data.getParcelableExtra(”data”);  
  20.             mAcountHeadIcon.setImageBitmap(bitmap);  
  21.         } else if (requestCode == TAKE_A_PICTURE) {  
  22.             Log.i(”zou”“resultCode:” + resultCode);  
  23.             cameraCropImageUri(Uri.fromFile(new File(IMGPATH, IMAGE_FILE_NAME)));  
  24.         } else if (requestCode == SET_PICTURE) {  
  25.             Log.i(”zou”“SET_PICTURE-resultCode:” + resultCode);  
  26.   
  27.             Bitmap bitmap = null;  
  28.             if (mIsKitKat) {  
  29.                 if (null != data) {  
  30.                     bitmap = data.getParcelableExtra(”data”);  
  31.                 }  
  32.             } else {  
  33.                 bitmap = decodeUriAsBitmap(Uri.fromFile(new File(IMGPATH, IMAGE_FILE_NAME)));  
  34.             }  
  35.             mAcountHeadIcon.setImageBitmap(bitmap);  
  36.         }  
  37.     }  
@Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == SELECT_A_PICTURE) {
            if (resultCode == RESULT_OK && null != data) {
                Log.i(“zou”, “4.4以下的”);
                Bitmap bitmap = decodeUriAsBitmap(Uri.fromFile(new File(IMGPATH,
                        TMP_IMAGE_FILE_NAME)));
                mAcountHeadIcon.setImageBitmap(bitmap);
            }
        } else if (requestCode == SELECET_A_PICTURE_AFTER_KIKAT) {
            if (resultCode == RESULT_OK && null != data) {
                Log.i(“zou”, “4.4以上上的”);
                mAlbumPicturePath = getPath(MainActivity.this, data.getData());
                cropImageUriAfterKikat(Uri.fromFile(new File(mAlbumPicturePath)));
            }
        } else if (requestCode == SET_ALBUM_PICTURE_KITKAT) {
            Log.i(“zou”, “4.4以上上的 RESULT_OK”);
            Bitmap bitmap = data.getParcelableExtra(“data”);
            mAcountHeadIcon.setImageBitmap(bitmap);
        } else if (requestCode == TAKE_A_PICTURE) {
            Log.i(“zou”, “resultCode:” + resultCode);
            cameraCropImageUri(Uri.fromFile(new File(IMGPATH, IMAGE_FILE_NAME)));
        } else if (requestCode == SET_PICTURE) {
            Log.i(“zou”, “SET_PICTURE-resultCode:” + resultCode);

            Bitmap bitmap = null;
            if (mIsKitKat) {
                if (null != data) {
                    bitmap = data.getParcelableExtra(“data”);
                }
            } else {
                bitmap = decodeUriAsBitmap(Uri.fromFile(new File(IMGPATH, IMAGE_FILE_NAME)));
            }
            mAcountHeadIcon.setImageBitmap(bitmap);
        }
    }

GIthub工程地址:https://github.com/ZBJDSBJ/CameraDemo


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