通过Uri获取图片的绝对路径

    public static String getRealPathFromUri(Context context, Uri uri) {
        if (context == null || uri == null) {
            return null;
        }
        if ("file".equalsIgnoreCase(uri.getScheme())) {
            return getRealPathFromUri_Byfile(context, uri);
        } else if ("content".equalsIgnoreCase(uri.getScheme())) {
            return getRealPathFromUri_Api11To18(context, uri);
        }
        return null;
    }




        public static String getRealPathFromUri_Byfile(Context context,Uri uri){
        String uri2Str = uri.toString();
        String filePath = uri2Str.substring(uri2Str.indexOf(":") + 3);
        return filePath;
    }
    private static String getRealPathFromUri_Api11To18(Context context, Uri uri) {
        String filePath = null;
        String[] projection = { MediaStore.Images.Media.DATA };

        CursorLoader loader = new CursorLoader(context, uri, projection, null,
                null, null);
        Cursor cursor = loader.loadInBackground();

        if (cursor != null) {
            cursor.moveToFirst();
            filePath = cursor.getString(cursor.getColumnIndex(projection[0]));
            cursor.close();
        }
        return filePath;
    }