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非法状态异常：在FragmentActivity类中，无法在onSaveInstanceState之后执行此操作。

androidandroid-fragmentsandroid-fragmentactivity
5
这是我编写的代码。有时它可以正常工作，但我找不到它出错的原因。
public class ListFragmentActivity extends FragmentActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
  main();
  IntentFilter filter1 = new IntentFilter("com.venkat.listfragment");
  registerReceiver(myReceiver, filter1);
  // register reciever intent filter.

}
public void main(){
    IntentFilter filter1 = new IntentFilter("com.venkat.listfragment");
    registerReceiver(myReceiver, filter1);
     List_Fragment ls_fragment = new List_Fragment();
     getSupportFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
     getSupportFragmentManager().beginTransaction()
     .replace(android.R.id.content, ls_fragment).addToBackStack(null).commitAllowingStateLoss();
}

@Override
protected void onSaveInstanceState(Bundle outState) {
}
private BroadcastReceiver myReceiver = new BroadcastReceiver()
{
    @Override
    public void onReceive(Context context, Intent intent) {
        main();

    }
};}

我有四个选项卡，当我点击其中一个选项卡时，它会显示相应的屏幕，并从该屏幕中导航到同一选项卡中的另一个屏幕。但是，为了在单击同一选项卡时返回上一个屏幕，我编写了一个广播接收器。
我遇到了以下错误：
08-19 10:13:51.436: E/AndroidRuntime(2830): FATAL EXCEPTION: main
08-19 10:13:51.436: E/AndroidRuntime(2830): java.lang.RuntimeException: Error receiving broadcast Intent { act=com.venkat.listfragment } in com.iheartsalesevent.main.ListFragmentActivity$1@44a89218
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.app.ActivityThread$PackageInfo$ReceiverDispatcher$Args.run(ActivityThread.java:905)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.os.Handler.handleCallback(Handler.java:587)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.os.Looper.loop(Looper.java:123)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.app.ActivityThread.main(ActivityThread.java:4627)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at java.lang.reflect.Method.invokeNative(Native Method)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at java.lang.reflect.Method.invoke(Method.java:521)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at dalvik.system.NativeStart.main(Native Method)
08-19 10:13:51.436: E/AndroidRuntime(2830): Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1343)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1354)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.support.v4.app.FragmentManagerImpl.popBackStack(FragmentManager.java:493)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at com.venkat.main.ListFragmentActivity.main(ListFragmentActivity.java:65)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at com.venkat.main.ListFragmentActivity$1.onReceive(ListFragmentActivity.java:89)
08-19 10:13:51.436: E/AndroidRuntime(2830):     at android.app.ActivityThread$PackageInfo$ReceiverDispatcher$Args.run(ActivityThread.java:892)
08-19 10:13:51.436: E/AndroidRuntime(2830):     ... 9 more

我查阅了许多与这个问题相关的链接，但它们都没有解决我的问题。
我认为这与在此 SO 问题中报告和讨论的这类问题有关。 - gunar
请不要在您的问题/答案中滥用引号符“>”。这不应该用于非引用。 - WarrenFaith
1个回答
7
在onResume()中注册BroadcastReceiver，然后在onPause()中取消注册可以解决该问题。如果需要，也可以使用onStart()/onStop()。
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