无法在libGDX中恢复活动

时间:2013-05-27 07:53:27

标签: android android-activity libgdx onresume

我正在尝试开发一个应用程序。它有一些活动,这些是, SplashActivityMainMenuActivity,和 GameActivity

现在,所有三个活动都扩展了BaseActivity,这也扩展了libgdx的AndroidApplication

SplashActivityMainMenuActivity中,我使用onCreate编写了纯机器人专用代码,setContentView使用了布局等等。我没有在这些活动上编写任何libgdx代码。

活动过渡是这样的, SplashActivity(它完成) - > MainMenuActivity(未完成) - > GameActivity

On,GameActivity,我的setContentView mygame布局,然后编写这段代码:

public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.mygame);

      gbbrdlyot1 = (RelativeLayout) findViewById(R.id.gbbrdlyot1);
      gameBoard = new RelativeLayout(this);
      RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(newBlockWidth, newBlockWidth);
      gameBoard.setLayoutParams(layoutParams);

      View gameView = initializeForView(new GameView(), true);
      gameBoard.addView(gameView);   

        gbbrdlyot1.addView(gameBoard);
}

但是我在SplashActivity上得到了RuntimeException,我不知道为什么,

    05-27 12:56:22.609:  java.lang.RuntimeException: Unable to resume activity com.game.MyGame/com.game.MyGame.SplashActivity}: java.lang.NullPointerException
05-27 12:56:22.609:  at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2124)
05-27 12:56:22.609:  at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139)
05-27 12:56:22.609: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672)
05-27 12:56:22.609:    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-27 12:56:22.609:    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
05-27 12:56:22.609: at android.os.Handler.dispatchMessage(Handler.java:99)
05-27 12:56:22.609: at android.os.Looper.loop(Looper.java:130)
05-27 12:56:22.609: at android.app.ActivityThread.main(ActivityThread.java:3687)
05-27 12:56:22.609: at java.lang.reflect.Method.invokeNative(Native Method)
05-27 12:56:22.609: at java.lang.reflect.Method.invoke(Method.java:507)
05-27 12:56:22.609: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
05-27 12:56:22.609: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
05-27 12:56:22.609: at dalvik.system.NativeStart.main(Native Method)
05-27 12:56:22.609: Caused by: java.lang.NullPointerException
05-27 12:56:22.609: at com.badlogic.gdx.backends.android.AndroidApplication.onResume(AndroidApplication.java:249)
05-27 12:56:22.609: at com.game.MyGame.SplashActivity.onResume(SplashActivity.java:43)
05-27 12:56:22.609: at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1150)
05-27 12:56:22.609: at android.app.Activity.performResume(Activity.java:3832)
05-27 12:56:22.609: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2114)
05-27 12:56:22.609: ... 12 more

1 个答案:

答案 0 :(得分:2)

这部分堆栈跟踪:

05-27 12:56:22.609: Caused by: java.lang.NullPointerException
05-27 12:56:22.609: at com.badlogic.gdx.backends.android.AndroidApplication.onResume(AndroidApplication.java:249)
05-27 12:56:22.609: at com.game.MyGame.SplashActivity.onResume(SplashActivity.java:43)

表示您的SplashActivity扩展了Libgdx AndroidApplication。但你写道:

  

在SplashActivity,MainMenuActivity中,我编写了纯机器人   特定代码使用onCreate,setcontentView布局等我有   不要在那些活动上写任何libgdx代码。

但是,如果您正在扩展AndroidApplication,那么您将获得一堆在暂停和恢复时运行的Libgdx代码。但是你还没有初始化Libgdx(因为这似乎是你GameActivity创作的副作用。

保持纯粹的Android活动纯净,不要扩展Libgdx类。