AndEngine GLES 2 - black screen, no errors

I am writing an Android game using AndEngine GLES 2 . Everything worked properly - I had a background image, there were sprites around and even some kind of music - until recently, I tried something new (I wanted to switch between two different scenes) when the display turned black.

I could still execute the game and no errors were found. All the entries in the magazines that I made during the game were shown, even the music played, so I knew that the game was working "correctly", but I did not see any image. Nothing. All are black.

So, I thought, everything changed, before this “error” appeared, it would do the trick. But still the screen is black.

I even tried to comment everything, but the background image is nothing.

Now, if this is not too much to ask, can someone please take a look at this short piece of code and tell me what is wrong there?

These are the variables that I use:

private SmoothCamera camera;
private BitmapTextureAtlas bitmapTextureAtlas;  
private Scene scene;
private Sprite background;

EngineOptions I've never changed, so they should be fine.

@Override
public EngineOptions onCreateEngineOptions() {
    float positionX = 80f; // horizontal (x) position of the camera
    float positionY = 280f; // vertical (y) position of the camera
    float velocityX = 200f; // velocity of the horizontal camera movement
    float velocityY = 200f; // velocity of the vertical camera movement
    float zoomFactor = 1f; // the camera zoom Factor (standard := 1)
    this.camera = new SmoothCamera(positionX, positionY, this.getWindowManager().getDefaultDisplay().getWidth(), this.getWindowManager().getDefaultDisplay().getHeight(), velocityX, velocityY, zoomFactor);
    EngineOptions options = new EngineOptions(true, ScreenOrientation.LANDSCAPE_SENSOR, new RatioResolutionPolicy(this.camera.getWidth(), this.camera.getHeight()), this.camera);
    return options;
}

Here I create a TextureAtlas and load the background image .

@Override
protected void onCreateResources() {
    // create the TextureAtlas
    BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
    this.bitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 1024, 1600, TextureOptions.NEAREST);

    // background
    this.background = new Sprite(0, 0, BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.bitmapTextureAtlas, this, "background.png", 0, 0, 1, 1), this.getVertexBufferObjectManager());
    this.mEngine.getTextureManager().loadTexture(this.bitmapTextureAtlas);
}

Finally, the Scene is created and the background is snapped.

@Override
protected Scene onCreateScene() {
    this.scene = new Scene();
    this.scene.attachChild(this.background);        
    return this.scene;
}

Now why won't this little activity be displayed? I forgot: its SimpleBaseGameActivity.

Well, since AndEngine GLES2 does not work on the emulator, I have to use my phone (Samsung Galaxy GIO) and cannot test the application on another machine.

- ? !

• Christoph