Question

我希望在libgdx中使用特定于Android的代码。我按照链接中的教程：http://carlorodriguez.github.io/blog/2014/10/05/android-platform-specific-code-with-libgdx/

我的主要课程是：

public class mainclass extends Game implements ApplicationListener {

public ActionResolver mactionResolver;

public mainclass(ActionResolver mactionResolver){

    this.mactionResolver = mactionResolver;


};
@Override
public void create() {

    Gdx.gl.glClearColor(0, 0, 0, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    this.mactionResolver.showToast("Hi");  <----here nullpointerexception
    }

}

我的android actionresolver是：

public class actionresolverapp implements ActionResolver {
Handler handler;
Context context;
public actionresolverapp(Context context) {
    handler = new Handler();
    this.context = context;
}


@Override
public void showToast(final CharSequence text) {
    handler.post(new Runnable() {
        @Override
        public void run() {
            Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
        }
    });
}

}

最后我在libgdx核心的界面是：

public interface ActionResolver {
    public void showToast(CharSequence text);

}

请问为什么我在mainclass中有例外？

编辑：这里是AndroidLauncher

public class AndroidLauncher extends AndroidApplication{
actionresolverapp mactionresolverapp;
@Override
protected void onCreate (Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    mactionresolverapp = new actionresolverapp(this);
    AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

    initialize(new mainclass(mactionresolverapp), config);



}

}

Answer 1

我认为界面一切正常。问题可能出在您在showToast（）

中创建的Handler中

尝试：

     public actionresolverapp (Activity activity, AndroidApplication application){
            this.activity = activity;
            this.application = application;
        }

void showToast(final String text){
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                application.handler.post(new Runnable() { // This thread runs in the UI
                    @Override
                    public void run() {
                        Toast.makeText(activity, text, Toast.LENGTH_SHORT).show();
                    }
            });
        }
        };
        new Thread(runnable).start();
}

在libgdx中使用Android特定代码

1 个答案: