[android help] android screen goes black if I open cocos 2d project after getting out of an activity

android screen goes black if I open cocos 2d project after getting out of an activity

My android screen goes black if I open cocos 2d project after getting out of an activity

public static CCScene scene() 
    {

        CCScene scene = CCScene.node();
        CCLayer layer = new TemplateLayer();

        scene.addChild(layer);

        return scene;
    }

this is my template layer

In this teplate I am adding several sprites and initializing update selector

protected TemplateLayer(ccColor4B color) 
{

    super(color);

    sensorManager = (SensorManager) CCDirector.sharedDirector()
            .getActivity().getSystemService(Context.SENSOR_SERVICE);

    if (sensorManager != null) 
    {
        orientation = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
    }
    else
    {
        orientation = null;
    }

    this.setIsTouchEnabled(true);

    game = new GameActivity();

    ball = CCSprite.sprite("rect.png");

    x= winSize.width/8;
    y= winSize.height/8;


    ball.setAnchorPoint(CGPoint.ccp(0, 0));       
    ball.setPosition(CGPoint.ccp((float)x, (float)y));
    addChild(ball);

    killerchild = CCSprite.sprite("logo.png");
    killerchild.setAnchorPoint(CGPoint.ccp(0, 0));

    killerchild.setPosition(CGPoint.ccp(winSize.width/2-killerchild.getContentSize().width/2, winSize.height-killerchild.getContentSize().height));
    addChild(killerchild);

    boat = CCSprite.sprite("boat.png");
    boat.setAnchorPoint(CGPoint.ccp(0, 0));

    boat.setPosition(CGPoint.ccp(winSize.width/2-boat.getContentSize().width/2,-boat.getContentSize().height/4));
    addChild(boat);


    pirates = CCSprite.sprite("Pirates.png");
    pirates.setAnchorPoint(CGPoint.ccp(0, 0));

    pirates.setPosition(CGPoint.ccp(winSize.width/2-pirates.getContentSize().width/2,winSize.height/2-pirates.getContentSize().height/2));
    addChild(pirates,-1);

    this.schedule("update");

// this.schedule("moveboat", 0f);

}

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