android 实现保存图片到相册

private boolean addBitmapToAlbum(Context context, Bitmap bm) {        String uriStr = MediaStore.Images.Media.insertImage(context.getContentResolver(), bm, "", "");                  SwitchLogger.d(LOG_TAG, "local album uriStr = " + uriStr);        if(uriStr == null){            return false;        }                  String picPath  = getFilePathByContentResolver(PictureDetailActivity.this, Uri.parse(uriStr) );        SwitchLogger.d(LOG_TAG, "begin to add to album, picture path = " + picPath);        if(picPath == null) {            return false;        }                      ContentResolver contentResolver = context.getContentResolver();        ContentValues values = new ContentValues(4);        values.put(Images.Media.DATE_TAKEN, System.currentTimeMillis());        values.put(Images.Media.MIME_TYPE, "image/png");        values.put(Images.Media.ORIENTATION, 0);        values.put(Images.Media.DATA, picPath);                         contentResolver.insert(Images.Media.EXTERNAL_CONTENT_URI, values);                  return true;    }
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