MediaPlayer.create returns null

[PuntoDiGoccia]

Description

MediaPlayer.create always returns null.
I dug into Robolectric framework and looks like this ShadowMediaPlayer's method fails:

  @Implementation
  public void prepare() {
    checkStateException("prepare()", preparableStates);
    MediaInfo info = getMediaInfo();
    if (info.preparationDelay > 0) {
      SystemClock.sleep(info.preparationDelay);
    }
    invokePreparedListener();
  }

getMediaInfo() returns null, which throws a NullPointerException, which in turn returns null to MediaPlayer.create

Steps to Reproduce

        if (mediaPlayer == null) {
            mediaPlayer = new MediaPlayer();
        }

        if (!mediaPlayer.isPlaying()) {
            mediaPlayer = MediaPlayer.create(this, R.raw.push_sound);
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setLooping(true);
            mediaPlayer.start();
        }

Robolectric & Android Version

Robolectric 3.8
Gradle 4.1
Android Plugin 3.0.1
AndroidStudio 3.1.1

[mrkostua]

Also had problems using ShadowMediaPlayer, tried to create simple player with create() method and test it but it field with same NullPointer exception. Have you made any progress on it?

[PuntoDiGoccia]

I inherited my own ShadowMediaPlayer to implement the create() method so that it adds the missing MediaInfo object:

`@Implements(MediaPlayer.class)
public class MediaPlayerShadow extends ShadowMediaPlayer{

@Implementation
public void __constructor__() {
    super.__constructor__();
}

@Implementation
public static MediaPlayer create(Context context, int resid){
    DataSource ds = DataSource.toDataSource(String.valueOf(resid));
    addMediaInfo(ds, new ShadowMediaPlayer.MediaInfo());

    MediaPlayer mp = new MediaPlayer();
    ShadowMediaPlayer shadow = Shadow.extract(mp);
    try {
        shadow.setDataSource(ds);
        shadow.setState(INITIALIZED);
        mp.prepare();
    } catch (Exception e) {
        return null;
    }

    return mp;
}

}`

[Kisty]

Hmm, I've encountered this bug. Would be great to add this to the library ShadowMediaPlayer.

[Kisty]

@PuntoDiGoccia can you reopen, please? This should be in the Robolectric framework really, shouldn't it, @xian?

[PuntoDiGoccia]

@Kisty sure can do if it can improve the framework