How to retrieve Album Art from .mp3 file using MediaMetadataRetriever()

Question

I'm trying to retrieve Album Art from MP3 file but the following code isn't working. Whenever the application starts it shows me Gray color box (check code in try/catch block).

public class MainActivity extends AppCompatActivity {

    MediaMetadataRetriever metaRetriver;
    byte[] art;
    ImageView album_art;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        getInit();

        Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;

        Cursor cursor = getContentResolver().query(uri, null, null, null, null);


        cursor.moveToFirst();

        String url = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));

        cursor.close();

        metaRetriver = new MediaMetadataRetriever();
        metaRetriver.setDataSource(url);

        try {
            art = metaRetriver.getEmbeddedPicture();

            Bitmap songImage = BitmapFactory
                    .decodeByteArray(art, 0, art.length);

            album_art.setImageBitmap(songImage);

        } catch (Exception e) {
            album_art.setBackgroundColor(Color.GRAY);
        }
    }

    public void getInit() {

        album_art = (ImageView) findViewById(R.id.album_art);

    }

}

I also tried using cursor for getting Album Art but it do not work.

Answer 1

You're getting NullPointerException

art = metaRetriver.getEmbeddedPicture();

MediaMetadataRetriever document](https://developer.android.com/reference/android/media/MediaMetadataRetriever#getembeddedpicture):

Call this method after setDataSource(). This method finds the optional graphic or album/cover art associated associated with the data source. If there are more than one pictures, (any) one of them is returned.

The byte array returned is null if not found so you have to check for null before decode.

Answer 2

There is no Album art for MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;

You need to use Uri uri = MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI;