Question

我一直在关注本教程：https://github.com/libgdx/libgdx/wiki/Admob-in-libgdx 我确定我已经正确地实现了所有内容，并且仍然为处理程序获取空指针。教程中的代码有问题吗？

这是我的Android启动码：

  public class AndroidLauncher extends AndroidApplication implements IActivityRequestHandler{
    protected AdView adView;

    private final int SHOW_ADS = 1;
    private final int HIDE_ADS = 0;

    protected Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch(msg.what) {
                case SHOW_ADS:
                {
                    adView.setVisibility(View.VISIBLE);
                    break;
                }
                case HIDE_ADS:
                {
                    adView.setVisibility(View.GONE);
                    break;
                }
            }
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      // Create the layout
      RelativeLayout layout = new RelativeLayout(this);

      // Do the stuff that initialize() would do for you
      requestWindowFeature(Window.FEATURE_NO_TITLE);
      getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
              WindowManager.LayoutParams.FLAG_FULLSCREEN);
      getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);

      // Create the libgdx View
      View gameView = initializeForView(new PBGame(this));

      // Create and setup the AdMob view
      AdView adView = new AdView(this);
      adView.setAdUnitId("Secret Key");
      adView.setAdSize(AdSize.BANNER);
      adView.loadAd(new AdRequest.Builder()
      .addTestDevice("Test Device")
      .build());

      // Add the libgdx view
      layout.addView(gameView);

      // Add the AdMob view
      RelativeLayout.LayoutParams adParams = 
         new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                RelativeLayout.LayoutParams.WRAP_CONTENT);
         adParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
         adParams.addRule(RelativeLayout.CENTER_HORIZONTAL);

      layout.addView(adView, adParams);
      // Hook it all up
      setContentView(layout);
    }

        @Override
        public void showAds(boolean show) {
            handler.sendEmptyMessage(show ? SHOW_ADS : HIDE_ADS);
        }
    }

我的游戏类：

public static final int VIRTUAL_WIDTH = 800;
public static final int VIRTUAL_HEIGHT = 480;
public static final float ASPECT_RATIO =
    (float)VIRTUAL_WIDTH/(float)VIRTUAL_HEIGHT;

public static final int zeroMakerX = 400, zeroMakerY = 240;

public static Camera camera;
public static Rectangle viewport;

private IActivityRequestHandler myRequestHandler;

public PBGame(IActivityRequestHandler handler) {
    myRequestHandler = handler;
}

@Override
public void create() {
    AssetHandler.load();
    super.setScreen(new TitleScreen(this));
    AssetHandler.music.play();
    AssetHandler.music.setLooping(true);
}

@Override 
public void dispose() {
    super.dispose();
}
}

最后是ReqestHandler：

public interface IActivityRequestHandler {
public void showAds(boolean show);
}

Answer 1

问题如下：

您的AdView对象是在onCreate()类的AndroidLauncher函数内本地定义的。然后，您尝试在onCreate()对象中的Handler之外访问它。 AdView对象超出范围。您应该在AdView之外的AndroidLauncher课程中声明onCreate()：

AdView adView;

然后在onCreate()中你可以像你一样实例化它：

// Create and setup the AdMob view
adView = new AdView(this);
adView.setAdUnitId("Secret Key");
adView.setAdSize(AdSize.BANNER);
adView.loadAd(new AdRequest.Builder()
  .addTestDevice("Test Device")
  .build());

LibGDX广告控制教程产生空指针

1 个答案: