android - 创建声音时，AndEngine NullpointerException

Question

快速提问:
我有以下代码:

public EngineOptions onCreateEngineOptions() {
    instance = this;

    mCamera = new org.andengine.engine.camera.Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

    EngineOptions engineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE_SENSOR, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera);
    engineOptions.getAudioOptions().setNeedsSound(true);
    //engineOptions.getAudioOptions().setNeedsMusic(true);


    return engineOptions;

}

和

protected void onCreateResources() {





    SoundFactory.setAssetBasePath("mfx/");



    try {
        this.testSound = SoundFactory.createSoundFromAsset(this.mEngine.getSoundManager(), this, "explosion.ogg");
    } catch (final IOException e) {
        Debug.e(e);
    }
}

最后，我在另一场将此 Activity 作为 Realm 的类里面演奏:

    activity.mCurrentScene.registerTouchArea(image);
    activity.mCurrentScene.setOnAreaTouchListener(new IOnAreaTouchListener() {

        @Override
        public boolean onAreaTouched(TouchEvent pSceneTouchEvent,
                ITouchArea pTouchArea, float pTouchAreaLocalX,
                float pTouchAreaLocalY) {
            Zancudo.this.activity.testSound.play();
            return false;
        }
    });

任何想法为什么我会得到一个nullpointer异常？

谢谢!

Answer 1

对于播放声音，您使用的方式如下

Zancudo.this.activity.testSound.play();

这看起来像问题，因为此处未在Zancudo类中实例化 Activity 对象。

要访问testSound，您需要获取 Zancudo Activity 的实例。