textureview onSurfaceTextureAvailable n'a jamais appelé à l'intérieur de relativelayout à l'intérieur du fragment

onSurfaceTextureAvailable dans VideoView n'est jamais appelé...
J'ai ce point de vue qui est maintenant le textureview.

public class MyMediaPlayer extends RelativeLayout{

Context mContext;
VideoView player;//this is a custom textureview that streams video

public MyMediaPlayer(Context context) {
    super(context);
    mContext = context; 
    init();
}
public MyMediaPlayer(Context context, AttributeSet attrs) {
    super(context, attrs);
    mContext = context; 
    init();
}
public MyMediaPlayer(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    mContext = context; 
    init();
}
private void init() {
    setBackgroundColor(Color.BLACK);    
    player = new VideoView(mContext);
    LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
    addView(player,lp);
}
public void setURL(String url){
    player.setVideoPath(url);
}
public void start(){
    player.start();
}

}

VideoView est mis en place comme ceci:

public class VideoView extends TextureView {
public VideoView(final Context context) {
super(context);
mContext = context;
initVideoView();
}
public VideoView(final Context context, final AttributeSet attrs) {
super(context, attrs);
mContext = context;
initVideoView();
}
public VideoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
initVideoView();
}
public void initVideoView() {
Log.d(LOG_TAG, "Initializing video view.");
videoHeight = 0;
videoWidth = 0;
setFocusable(false);
setSurfaceTextureListener(surfaceTextureListener);
}
SurfaceTextureListener surfaceTextureListener = new SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(final SurfaceTexture surface, final int width, final int height) {
Log.d(LOG_TAG, "Surface texture now avaialble.");
surfaceTexture = surface;
openVideo();
}
@Override
public void onSurfaceTextureSizeChanged(final SurfaceTexture surface, final int width, final int height) {
Log.d(LOG_TAG, "Resized surface texture: " + width + '/' + height);
surfaceWidth = width;
surfaceHeight = height;
boolean isValidState =  (targetState == STATE_PLAYING);
boolean hasValidSize = (videoWidth == width && videoHeight == height);
if (mediaPlayer != null && isValidState && hasValidSize) {
start();
}
}
@Override
public boolean onSurfaceTextureDestroyed(final SurfaceTexture surface) {
Log.i(LOG_TAG, "Destroyed surface number " + number);
return false;
}
@Override
public void onSurfaceTextureUpdated(final SurfaceTexture surface) {
}
};
}

MyMediaPlayer de configuration dans un fichier xml d'un fragment.
Si je place le VideoView à l'intérieur du fragment ensuite tout fonctionne bien.
Mais si c'est dans mymediaplayer à l'intérieur du fragment onSurfaceTextureAvailable n'est jamais appelée.

source d'informationauteur Amitay Molko