Android-Libgdx，在按钮点击游戏开始后调用另一个活动

Question

当我需要在游戏启动后单击按钮时调用另一个活动时，我遇到了一个重大问题。 Game 是通过 AndroidApplication 接口的initial(game, ) 方法调用的。

在普通 Activity 中，我可以轻松调用另一个 Activity，但从实现 AndroidApplication 的 Libgdx 类调用另一个 Activity 似乎很困难。

谁能建议一个适当的方法来从实现 AndroidApplication 接口的 Libgdx 类调用 Activity？

我尝试了一个星期，但似乎我的方法完全错误..

提前致谢。

Answer 1

在你的 LibGdx 类中定义一个回调接口，并用它来通知你的AndroidLauncher 开始新的活动。

例如在您的 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!")
        }
    }
}

然后确保您的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);
    }

}