Andengine engine won't set scene

Question

I am trying to create a simple scene and show it but it won't work and I can't find what I am doing wrong.

Here is my main activity

public class MainActivity extends BaseGameActivity implements IOnSceneTouchListener{
final static String TAG = "BounceTest";
Scene scene;
float downX;
float downY;

@Override
public EngineOptions onCreateEngineOptions() {
    Log.d(TAG, "onCreateEngineOptions");
    return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new FillResolutionPolicy(), new Camera(0, 0, 800, 480));
}

@Override
public void onCreateResources(OnCreateResourcesCallback pOnCreateResourcesCallback) throws Exception {
    Log.d(TAG, "onCreateResources");
}

@Override
public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback) throws Exception {
    Log.d(TAG, "onCreateScene");
    scene = new Scene(){
        @Override
        protected void onManagedUpdate(float pSecondsElapsed) {
            Log.d(TAG, "onManagedUpdate");
            super.onManagedUpdate(pSecondsElapsed);
        }
    };
    this.getEngine().setScene(scene);
    scene.setOnSceneTouchListener(this);
}

@Override
public void onPopulateScene(Scene pScene, OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception {
    Log.d(TAG, "onPopulateScene");
    Rectangle floor = new Rectangle(-200, 0, 1000, 20, this.getVertexBufferObjectManager());
    Rectangle square = new Rectangle(0, 20, 20, 20, this.getVertexBufferObjectManager());
    scene.attachChild(floor);
    scene.attachChild(square);
}

@Override
public boolean onSceneTouchEvent(Scene pScene, TouchEvent pSceneTouchEvent) {
    Log.d(TAG, "onSceneTouchEvent");
    if(pSceneTouchEvent.getAction() == TouchEvent.ACTION_DOWN){
        downX = pSceneTouchEvent.getX();
        downY = pSceneTouchEvent.getY();
    }else if(pSceneTouchEvent.getAction() == TouchEvent.ACTION_UP){
        float upX = pSceneTouchEvent.getX();
        float upY = pSceneTouchEvent.getY();
        float xDiff = downX - upX;
        float yDiff = downY - upY;
        float dragLength = (float)Math.sqrt(xDiff*xDiff+yDiff*yDiff);
        Log.d(TAG, "dragLength:"+dragLength);
    }

    return false;
}

}

All I can see on my phone is a black screen (the rectangles are not there), the "onManagedUpdate" does not show and touching the screen won't call onSceneTouchEvent.

Why is that so?

Answer 1

Return true for onSceneTouchEvent calling. Finishe callback methods when they transfer one method to other in Engine Life Cycle methods. Add below 3 line to corresponding methods.

pOnCreateResourcesCallback.onCreateResourcesFinished(); after onCreateResources() finished

pOnCreateSceneCallback.onCreateSceneFinished(mScene); after onCreateScene() finished

pOnPopulateSceneCallback.onPopulateSceneFinished(); after onPopulateScene() finished.

Like:

@Override
public void onCreateResources(OnCreateResourcesCallback pOnCreateResourcesCallback) throws Exception {
    Log.d(TAG, "onCreateResources");
    // your code will be here 
    // call this callback;
    pOnCreateResourcesCallback.onCreateResourcesFinished();
}

@Override
public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback) throws Exception {
    Log.d(TAG, "onCreateScene");

    // your code will be here 
    // call this callback;
    pOnCreateSceneCallback.onCreateSceneFinished(mScene);
}

@Override
public void onPopulateScene(Scene pScene, OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception {
    Log.d(TAG, "onPopulateScene");

    // your code will be  here

    // call this callback;
    pOnPopulateSceneCallback.onPopulateSceneFinished();
}