shadows/framework/src/main/java/org/robolectric/shadows/ShadowMediaPlayer.java
@Implementation
  protected void prepareAsync() {
    checkStateException("prepareAsync()", preparableStates);
    state = PREPARING;
    MediaInfo info = getMediaInfo();
    if (info.preparationDelay >= 0) {
      postEventDelayed(preparedCallback, info.preparationDelay);
    }
  }
@Implementation
  protected void prepareAsync() {
    checkStateException("prepareAsync()", preparableStates);
    state = PREPARING;
    MediaInfo info = getMediaInfo();
    if (info.preparationDelay >= 0) {
      postEventDelayed(preparedCallback, info.preparationDelay);
    }
  }
Simulates {@link MediaPlayer#prepareAsync()}. Sets state to PREPARING and posts a callback to
{@link #invokePreparedListener()} if the current preparation delay for the current media (see
{@link #getMediaInfo()}) is &gt;= 0, otherwise the test suite is responsible for calling {@link
#invokePreparedListener()} directly if required.

@see MediaInfo#setPreparationDelay(int)
@see #invokePreparedListener()