android 實現保存圖片到相冊

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;
    }