Android studio Unity的windowsFocusChanged()有时会给我带来NullPointerException
我正在尝试将Unity项目导入Android Studio项目。我已经知道如何通过管理活动来实现这一点,但现在我尝试使用片段来实现这一点,以便只在屏幕的一部分显示我的Unity场景,而在另一部分显示一些本机UI。 为了做到这一点,我遵循了这一点:我修改了它以适应我的代码Android studio Unity的windowsFocusChanged()有时会给我带来NullPointerException,android-studio,android-fragments,unity3d,Android Studio,Android Fragments,Unity3d,我正在尝试将Unity项目导入Android Studio项目。我已经知道如何通过管理活动来实现这一点,但现在我尝试使用片段来实现这一点,以便只在屏幕的一部分显示我的Unity场景,而在另一部分显示一些本机UI。 为了做到这一点,我遵循了这一点:我修改了它以适应我的代码 public class UnityManagerFragment extends MyFragmentManager { protected UnityPlayer mUnityPlayer; public
public class UnityManagerFragment extends MyFragmentManager {
protected UnityPlayer mUnityPlayer;
public FrameLayout unityFrameLayout;
public UnityManagerFragment()
{
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
mUnityPlayer = new UnityPlayer(getActivity());
View view = inflater.inflate(R.layout.unity_manager_view, container, false);
this.unityFrameLayout = (FrameLayout) view.findViewById(R.id.unity_fragment);
this.unityFrameLayout.addView(mUnityPlayer.getView(), FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.MATCH_PARENT);
mUnityPlayer.requestFocus();
mUnityPlayer.windowFocusChanged(true);
return view;
}
}
MyFragmentManager
扩展了Fragments
并且不会产生任何会导致问题的东西,事实上,问题出现在我创建此类之前。
我的问题在于行mUnityPlayer.windowFocusChanged(true)当我点击按钮启动Unity片段时,它有时会使我的应用程序崩溃。日志告诉我:
Caused by: java.lang.RuntimeException:
Unable to start activity ComponentInfo{com.example.testfragments/com.example.testfragments.UnityFragmentContainerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.os.Handler.sendMessage(android.os.Message)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3124)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3233)
at android.app.ActivityThread.access$1000(ActivityThread.java:197)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1656)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6873).
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.os.Handler.sendMessage(android.os.Message)' on a null object reference
at android.os.Message.sendToTarget(Message.java:416)
at com.unity3d.player.UnityPlayer$b.a(Unknown Source)
at com.unity3d.player.UnityPlayer$b.a(Unknown Source)
at com.unity3d.player.UnityPlayer.windowFocusChanged(Unknown Source)
at com.example.testfragments.UnityManagerFragment.onCreateView(UnityManagerFragment.java:43).
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2192)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1299)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:388)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:607)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1250)
at android.app.Activity.performStart(Activity.java:6588)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3087)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3233)
at android.app.ActivityThread.access$1000(ActivityThread.java:197)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1656)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6873)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
方法windowsFocusChanged
来自unity-classes.jar,它是unity在导出其项目时生成的,我无法修改它。我必须使用它,否则我会得到一个黑屏,而不是看到我的场景。
我不知道发生了什么事,有人能帮我吗?
谢谢。在getActivity()
上进行空指针检查,有时片段管理器使用getActivity()方法返回活动的空引用 使用Unity 2019。问题已经解决,我正在使用2019.1.10f您好,谢谢您的回答。我添加了一个新的NullPointerException以查看getActivity()是否返回null,并检查了它的值。它总是返回当前活动,即使我的应用程序崩溃。所以我不认为这是问题的原因。你找到解决方案了吗?我也面临着同样的问题。在我花了相当长的时间放弃之后,请帮助我,因为我需要将Unity集成到iOS应用程序中。也许以后如果我有时间…你解决了这个问题吗?现在我面临以下问题如果你知道解决方法,请帮助我