1

我在 Android 活动中显示视图，它通过 http 加载数据并通过线程导航视图。

它工作得很好。但是当它正在加载数据并且我按下它时它已经崩溃了。我的错误代码如下。我还实现了 onSaveInstanceState() 和 onRestoreInstanceState()。

做需要，谢谢。

@Override
public void onSaveInstanceState(Bundle savedInstanceState){     
    super.onSaveInstanceState(savedInstanceState);
}

@Override 
public void onRestoreInstanceState(Bundle savedInstanceState){
    super.onRestoreInstanceState(savedInstanceState);
}
 ------------------------------------------------------------------------------------------------
 java.lang.RuntimeException: Unable to pause activity {com.sample.android/com.sample.android.SampleActivity}: java.lang.NullPointerException
 at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3354)
 at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3311)
 at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3294)
 at android.app.ActivityThread.access$2500(ActivityThread.java:126)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2045)
 at android.os.Handler.dispatchMessage(Handler.java:99) 
 at android.os.Looper.loop(Looper.java:123)
 at android.app.ActivityThread.main(ActivityThread.java:4633)
 at java.lang.reflect.Method.invokeNative(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:521)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.NullPointerException
 at android.support.v4.view.ViewPager.onSaveInstanceState(ViewPager.java:507)
 at android.view.View.dispatchSaveInstanceState(View.java:6068)
 at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1180) 
 at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1184)
 at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1184)
 at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1184)
 at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1184)
 at android.view.View.saveHierarchyState(View.java:6051) 
 at com.android.internal.policy.impl.PhoneWindow.saveHierarchyState(PhoneWindow.java:1490)
 at android.app.Activity.onSaveInstanceState(Activity.java:1086)
 at com.yoke.android.SampleActivity.onSaveInstanceState(YokeActivity.java:352)
 at android.app.Activity.performSaveInstanceState(Activity.java:1036)
 at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1180)
 at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3336)
4

0 回答 0