Question

When I pass sprite in parameter and initialize that object in method but reference of Object is still null which I passed in method. Here is my Method.

public void createAndLoadSimpleSprite(Sprite sprite ,String name,
        SimpleBaseGameActivity activity, int width, int height) {

    BitmapTextureAtlas atlasForBGSprite = new BitmapTextureAtlas(
            activity.getTextureManager(), width, height);
    TextureRegion backgroundSpriteTextureRegion = BitmapTextureAtlasTextureRegionFactory
            .createFromAsset(atlasForBGSprite, activity, name, 0, 0);
    sprite = new Sprite(0, 0, backgroundSpriteTextureRegion,
            activity.getVertexBufferObjectManager());
    activity.getTextureManager().loadTexture(atlasForBGSprite);

}

and here how I am calling it.

createAndLoadSimpleSprite(defualtCageSprite,"bg.png", this, 450, 444);

but accessing defaultCageSprite still throws a null pointer exception… I am not if sure it’s a AndEngine issue. But Can’t we pass sprites as parameters in AndEngine if no what is the work around??

Answer 1

You have to change your method to return the sprite object:

public Sprite createAndLoadSimpleSprite(String name,
    SimpleBaseGameActivity activity, int width, int height) {

BitmapTextureAtlas atlasForBGSprite = new BitmapTextureAtlas(
        activity.getTextureManager(), width, height);
TextureRegion backgroundSpriteTextureRegion = BitmapTextureAtlasTextureRegionFactory
        .createFromAsset(atlasForBGSprite, activity, name, 0, 0);
activity.getTextureManager().loadTexture(atlasForBGSprite);

Sprite sprite = new Sprite(0, 0, backgroundSpriteTextureRegion,
        activity.getVertexBufferObjectManager());

return sprite;

}

Now you can call:

defualtCageSprite = createAndLoadSimpleSprite("bg.png", this, 450, 444);

Do not forget to attach your sprite to the scene.