Android-Libgdx，在按鈕上啓動遊戲後調用另一個活動點擊

Question

當遊戲開始後點擊按鈕時需要調用另一個活動時，我遇到了一個主要問題。遊戲通過AndroidApplication接口的啓動（遊戲）方法調用。

在正常的Activity中，我可以輕鬆地調用另一個Activity，但似乎很難從實現AndroidApplication的Libgdx類調用另一個Activity。

任何人都可以提出一個合適的方法來調用實現AndroidApplication接口的Libgdx類的Activity嗎？

我想了一個星期做到這一點，但似乎我的方法是完全錯誤的。在提前

感謝。

Answer 1

在你的LibGdx類中定義一個回調接口，並用它來通知你的AndroidLauncher開始新的活動。

例如在LibGdx遊戲類：

// 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!") 
     } 
    } 
} 

然後確保您的AndroidLauncher實現所需的接口：

// 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); 
    } 

}