Android-Libgdx,在游戏开始后点击按钮,调用另一个活动

Question

当我在游戏开始后点击按钮时需要调用另一个活动时,我遇到了一个主要问题.游戏通过AndroidApplication界面的启动(游戏)方法调用.

在正常的Activity中,我可以轻松地调用另一个Activity,但似乎很难从实现AndroidApplication的Libgdx类调用另一个Activity.

任何人都可以建议一个适当的方法来调用实现AndroidApplication接口的Libgdx类的Activity吗？

我试着做了一个星期,但似乎我的方法完全错了..

提前致谢.

Answer 1

在LibGdx类中定义回调接口,并使用它来通知您AndroidLauncher启动新活动.

例如在你的LibGdx游戏类中:

// Your Game class in the core package
public class MyGame extends Game {

    // Define an interface for your various callbacks to the android launcher
    public interface MyGameCallback {
        public void onStartActivityA();
        public void onStartActivityB();
        public void onStartSomeActivity(int someParameter, String someOtherParameter);
    }

    // Local variable to hold the callback implementation
    private MyGameCallback myGameCallback;

    // ** Additional **
    // Setter for the callback
    public void setMyGameCallback(MyGameCallback callback) {
        myGameCallback = callback;
    }

    @Override
    public void create () {
        ...
    }

    ...

    private void someMethod() {
        ...
        // check the calling class has actually implemented MyGameCallback
        if (myGameCallback != null) {

            // initiate which ever callback method you need.
            if (someCondition) {
                myGameCallback.onStartActivityA();
            } else if (someOtherCondition) {
                myGameCallback.onStartActivityB();
            } else {
                myGameCallback.onStartSomeActivity(someInteger, someString);
            }

        } else {
            Log.e("MyGame", "To use this class you must implement MyGameCallback!")
        }
    }
}

然后确保您AndroidLauncher实现所需的接口:

// Your AndroidLauncher
public class AndroidLauncher extends AndroidApplication implements MyGame.MyGameCallback {

    @Override
    protected void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();

        // create an instance of MyGame, and set the callback
        MyGame myGame = new MyGame;
        // Since AndroidLauncher implements MyGame.MyGameCallback, we can just pass 'this' to the callback setter.
        myGame.setMyGameCallback(this);

        initialize(myGame, config);
    }

    @Override
    public void onStartActivityA() {
        Intent intent = new Intent(this, ActivityA.class);
        startActivity(intent);
    }

    @Override
    public void onStartActivityB(){
        Intent intent = new Intent(this, ActivityB.class);
        startActivity(intent);
    }

    @Override
    public void onStartSomeActivity(int someParameter, String someOtherParameter){
        Intent intent = new Intent(this, ActivityA.class);

        // do whatever you want with the supplied parameters.
        if (someParameter == 42) {
            intent.putExtra(MY_EXTRA, someOtherParameter);
        }
        startActivity(intent);
    }

}