android選擇圖片，經過uri獲取路徑

/**
 * 選擇相冊圖片
 */
public void choosePhoto() {
        Intent intent = new Intent();
		intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
        intent.setAction(Intent.ACTION_PICK);
        startActivityForResult(intent, ALBUM_REQUEST_CODE);
}

 	@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == ALBUM_REQUEST_CODE) {
                try {
                    Uri uri = data.getData();

                    Bitmap bitmap = getBitmap(uri);
                    // 設置圖片預覽
                    ivPhoto.setImageBitmap(bitmap);

                    photoPath = getRealPathFromUri(FeedBackActivity.this, uri);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
	
	private Bitmap getBitmap(Uri uri) {
        if (uri == null) return null;

        Bitmap bitmap = null;
        try {
            ContentResolver cr = this.getContentResolver();
            bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            LogUtils.e("Exception", e.getMessage(),e);
        }
        return bitmap;
    }

/**
 * 根據Uri獲取圖片的絕對路徑
 *
 * @param context 上下文對象
 * @param uri     圖片的Uri
 * @return 若是Uri對應的圖片存在, 那麼返回該圖片的絕對路徑, 不然返回null
 */
public static String getRealPathFromUri(Context context, Uri uri) {
    int sdkVersion = Build.VERSION.SDK_INT;
    if (sdkVersion >= 19) { // api >= 19
        return getRealPathFromUriAboveApi19(context, uri);
    } else { // api < 19
        return getRealPathFromUriBelowAPI19(context, uri);
    }
}
 
/**
 * 適配api19如下(不包括api19),根據uri獲取圖片的絕對路徑
 *
 * @param context 上下文對象
 * @param uri     圖片的Uri
 * @return 若是Uri對應的圖片存在, 那麼返回該圖片的絕對路徑, 不然返回null
 */
private static String getRealPathFromUriBelowAPI19(Context context, Uri uri) {
    return getDataColumn(context, uri, null, null);
}
 
/**
 * 適配api19及以上,根據uri獲取圖片的絕對路徑
 *
 * @param context 上下文對象
 * @param uri     圖片的Uri
 * @return 若是Uri對應的圖片存在, 那麼返回該圖片的絕對路徑, 不然返回null
 */
@SuppressLint("NewApi")
private static String getRealPathFromUriAboveApi19(Context context, Uri uri) {
    String filePath = null;
    if (DocumentsContract.isDocumentUri(context, uri)) {
        // 若是是document類型的 uri, 則經過document id來進行處理
        String documentId = DocumentsContract.getDocumentId(uri);
        if (isMediaDocument(uri)) { // MediaProvider
            // 使用':'分割
            String id = documentId.split(":")[1];
 
            String selection = MediaStore.Images.Media._ID + "=?";
            String[] selectionArgs = {id};
            filePath = getDataColumn(context, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection, selectionArgs);
        } else if (isDownloadsDocument(uri)) { // DownloadsProvider
            Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(documentId));
            filePath = getDataColumn(context, contentUri, null, null);
        }
    } else if ("content".equalsIgnoreCase(uri.getScheme())){
        // 若是是 content 類型的 Uri
        filePath = getDataColumn(context, uri, null, null);
    } else if ("file".equals(uri.getScheme())) {
        // 若是是 file 類型的 Uri,直接獲取圖片對應的路徑
        filePath = uri.getPath();
    }
    return filePath;
}
 
/**
 * 獲取數據庫表中的 _data 列，即返回Uri對應的文件路徑
 * @return
 */
private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
    String path = null;
 
    String[] projection = new String[]{MediaStore.Images.Media.DATA};
    Cursor cursor = null;
    try {
        cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
        if (cursor != null && cursor.moveToFirst()) {
            int columnIndex = cursor.getColumnIndexOrThrow(projection[0]);
            path = cursor.getString(columnIndex);
        }
    } catch (Exception e) {
            e.printStackTrace();
	}finally {
		if (cursor != null) {
			cursor.close();
		}
	}
    return path;
}
 
/**
 * @param uri the Uri to check
 * @return Whether the Uri authority is MediaProvider
 */
private 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 DownloadsProvider
 */
private static boolean isDownloadsDocument(Uri uri) {
    return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}