Java 将OnCreateOptions菜单结果删除到NullPointerException

我发现当我按下设备上的菜单按钮时，它会给我一个NullPointerException

 public boolean onCreateOptionsMenu(Menu menu) {
       getMenuInflater().inflate(R.menu.main, menu); //NullPointer Here
        return true;
    }

因此，我所做的是通过删除上面的第二行并将返回类型更改为false来完全禁用菜单。然而，它仍然给我一个NullPointerException。以下是堆栈：

11-25 03:50:20.931    1212-1212/com.sblive.aufschoolbliz E/InputEventSender﹕ Exception dispatching finished signal.
11-25 03:50:20.931    1212-1212/com.sblive.aufschoolbliz E/MessageQueue-JNI﹕ Exception in MessageQueue callback: handleReceiveCallback
11-25 03:50:21.040    1212-1212/com.sblive.aufschoolbliz E/MessageQueue-JNI﹕ java.lang.NullPointerException
            at android.support.v7.app.ActionBarImplICS.getThemedContext(ActionBarImplICS.java:274)
            at android.support.v7.app.ActionBarActivityDelegate.getMenuInflater(ActionBarActivityDelegate.java:89)
            at android.support.v7.app.ActionBarActivity.getMenuInflater(ActionBarActivity.java:71)
            at android.app.Activity.onCreatePanelMenu(Activity.java:2505)
            at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)
            at android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:224)
            at android.support.v7.app.ActionBarActivityDelegateICS.onCreatePanelMenu(ActionBarActivityDelegateICS.java:141)
            at android.support.v7.app.ActionBarActivity.onCreatePanelMenu(ActionBarActivity.java:199)
            at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.onCreatePanelMenu(ActionBarActivityDelegateICS.java:280)
            at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:413)
            at com.android.internal.policy.impl.PhoneWindow.onKeyDownPanel(PhoneWindow.java:795)
            at com.android.internal.policy.impl.PhoneWindow.onKeyDown(PhoneWindow.java:1471)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1867)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:3791)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3774)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3379)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3429)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3398)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3483)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3406)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3540)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3379)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3429)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3398)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3406)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3379)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3429)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3398)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3516)
            at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3666)
            at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:1982)
            at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1698)
            at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1689)
            at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:1959)
            at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
            at android.os.MessageQueue.nativePollOnce(Native Method)
            at android.os.MessageQueue.next(MessageQueue.java:132)
            at android.os.Looper.loop(Looper.java:124)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)

11-25 03:50:21.040    1212-1212/com.sblive.aufschoolbliz D/AndroidRuntime﹕ Shutting down VM
11-25 03:50:21.040    1212-1212/com.sblive.aufschoolbliz W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41465700)
11-25 03:50:21.150    1212-1212/com.sblive.aufschoolbliz E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NullPointerException
            at android.support.v7.app.ActionBarImplICS.getThemedContext(ActionBarImplICS.java:274)
            at android.support.v7.app.ActionBarActivityDelegate.getMenuInflater(ActionBarActivityDelegate.java:89)
            at android.support.v7.app.ActionBarActivity.getMenuInflater(ActionBarActivity.java:71)
            at android.app.Activity.onCreatePanelMenu(Activity.java:2505)
            at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)
            at android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:224)
            at android.support.v7.app.ActionBarActivityDelegateICS.onCreatePanelMenu(ActionBarActivityDelegateICS.java:141)
            at android.support.v7.app.ActionBarActivity.onCreatePanelMenu(ActionBarActivity.java:199)
            at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.onCreatePanelMenu(ActionBarActivityDelegateICS.java:280)
            at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:413)
            at com.android.internal.policy.impl.PhoneWindow.onKeyDownPanel(PhoneWindow.java:795)
            at com.android.internal.policy.impl.PhoneWindow.onKeyDown(PhoneWindow.java:1471)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1867)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:3791)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3774)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3379)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3429)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3398)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3483)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3406)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3540)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3379)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3429)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3398)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3406)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3379)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3429)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3398)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3516)
            at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3666)
            at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:1982)
            at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1698)
            at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1689)
            at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:1959)
            at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)
            at android.os.MessageQueue.nativePollOnce(Native Method)
            at android.os.MessageQueue.next(MessageQueue.java:132)
            at android.os.Looper.loop(Looper.java:124)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)

---

默认情况下为支持选项菜单创建。它会对指定的“menu R.menu.main”进行充气，您可能尚未对其进行定义。如果希望继续支持选项菜单，请在/res/menu文件夹中将菜单定义为“main.xml”，否则，如果不想支持选项菜单，请删除整个方法。

堆栈跟踪显示实际NPE位于

ActionBarImplICS.java

：

@Override
public Context getThemedContext() {
        return mActionBar.getThemedContext(); // here
}

操作栏为空的原因可能存在

• 您不是在onCreate（）中调用setContentView（）吗
• 您的清单中是否至少缺少了安卓：minSdkVersion=“11”
• 您使用的主题是否类似于android:theme=“@style/theme.NoTitle”
• 您是否在使用自定义样式，如

  android:windowIsFloating

  、

  android:backgroundDimEnabled

  或

  android:windowNoTitle

---

编辑：如果没有标题/操作栏，解决此问题的最佳方法似乎是。

尝试清理您的项目并重新构建。.检查应用程序中的

res/menu/main.xml

文件是否存在？我的res/menu/folder中确实有main.xml文件。您可以发布main.xml文件吗？我的res/menu文件夹中有一个menu.xml，但因为我不支持此选项菜单，我更改了返回类型。我还试图删除整个方法，但它也给我一个错误..我使用的主题没有标题栏。如果不使用带有标题栏的主题，我如何禁用选项？最好的方法是在这种情况下覆盖菜单按键：如果我要使用onKeyDown方法，这是否意味着我需要在应用程序的每个活动中覆盖菜单键？您可以定义一个名为

BaseActivity

的类，该类扩展

activity

，并在其中定义方法。然后让每个其他活动扩展

BaseActivity

。这样，我们就不能使用选项菜单，如果我们还需要支持显示选项菜单呢？

@Override
public Context getThemedContext() {
        return mActionBar.getThemedContext(); // here
}