转载：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：
/** * <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”）：
Uri is：content://com.android.providers.media.documents/document/image%3A18838 2 Uri.getPath is ：/document/image:18838 3 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）：
Uri is：content://media/external/images/media/18822 2 Uri.getPath is ：/external/images/media/18822 3 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：
Uri is：content://media/external/images/media/14046 2 Uri.getPath is ：/external/images/media/14046 3 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：
//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：
/** * <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); }
/** * <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); }
拍照通用方法，对返回数据做处理：
/** * <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：
@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