check android Media Scanner is running-检查Android Media Scanner 是否在运行

    public static boolean isMediaScannerScanning(Context context) {
        boolean result = false;
        Cursor cursor = query(context, MediaStore.getMediaScannerUri(),
                new String [] { MediaStore.MEDIA_SCANNER_VOLUME }, null, null, null);
        if (cursor != null) {
            if (cursor.getCount() == 1) {
                cursor.moveToFirst();
                result = "external".equals(cursor.getString(0));
            }
            cursor.close();
        }

        return result;
    }