无法暂停活动 DroFeedsActivity：java.lang.NullPointerException

Posted 2023-02-26

【中文标题】无法暂停活动 DroFeedsActivity：java.lang.NullPointerException

【英文标题】：Unable to pause activity DroFeedsActivity: java.lang.NullPointerException无法暂停活动 DroFeedsActivity：java.lang.NullPointerException

【发布时间】：2012-12-20 06:04:47

【问题描述】：

我的项目中有以下异常：

12-20 05:51:49.641: E/androidRuntime(426): java.lang.RuntimeException: Unable to pause activity com.dz.dro/com.dz.dro.DroFeedsActivity: java.lang.NullPointerException
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3162)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3119)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3102)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.ActivityThread.access$2400(ActivityThread.java:119)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1870)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.os.Handler.dispatchMessage(Handler.java:99)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.os.Looper.loop(Looper.java:123)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.ActivityThread.main(ActivityThread.java:4363)
12-20 05:51:49.641: E/AndroidRuntime(426):  at java.lang.reflect.Method.invokeNative(Native Method)
12-20 05:51:49.641: E/AndroidRuntime(426):  at java.lang.reflect.Method.invoke(Method.java:521)
12-20 05:51:49.641: E/AndroidRuntime(426):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
12-20 05:51:49.641: E/AndroidRuntime(426):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
12-20 05:51:49.641: E/AndroidRuntime(426):  at dalvik.system.NativeStart.main(Native Method)
12-20 05:51:49.641: E/AndroidRuntime(426): Caused by: java.lang.NullPointerException
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1576)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1617)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:481)
12-20 05:51:49.641: E/AndroidRuntime(426):  at com.actionbarsherlock.app.SherlockFragmentActivity.onSaveInstanceState(SherlockFragmentActivity.java:127)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.Activity.performSaveInstanceState(Activity.java:1022)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1180)
12-20 05:51:49.641: E/AndroidRuntime(426):  at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3144)
12-20 05:51:49.641: E/AndroidRuntime(426):  ... 12 more

当我在我的项目中使用带有 carasoul 效果的寻呼机 adpater 的 action bar sherlock 库时。对于每个部分，我定义了单独的片段。在我的应用程序中，一切都很顺利，但是当我单击 sherlock 操作栏中的操作菜单项时，它会抛出上述错误，我尝试了几种解决此问题的方法。

And I gone through several *** links which is similar to my issue, none of the links solves my probs

我使用以下方法将片段添加到 sectionpageradapter 中：

    @Override
    public Fragment getItem(int position) 
        Fragment fragment = new Fragment();

      switch(position) 
         case 0 :
            fragment = new ListUserFeedFragment("some url");
            break;
         case 1 :
            fragment = new ListAllFeedFragment("some url");
            break;
      
    return fragment;
    

【问题讨论】：

如果有帮助，请查看这两个帖子。 ***.com/questions/9292047/…***.com/questions/8748064/…

【参考方案1】：

我认为你应该这样做：

@Override
public Fragment getItem(int position) 
    ListUserFeedFragment fragment;

  switch(position) 
     case 0 :
        fragment = new ListUserFeedFragment("some url");
        break;
     case 1 :
        fragment = new ListAllFeedFragment("some url");
        break;
  
return fragment;