非常简单的代码,但在使用Fragment时出现错误"Activity已被破坏"

Question

我做了一个非常简单的Activity,它显示了一个简单的ListFragment,如下所示:

我的活动:

public class MyActivity extends FragmentActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
          FragmentManager fragMgr = getSupportFragmentManager();

          FirstFragment list = new FirstFragment();
          fragMgr.beginTransaction().add(android.R.id.content, list).commit();
    }

}

我的ListFragment:

public class FirstFragment extends ListFragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        inflater.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        View view = inflater.inflate(R.layout.main, null);
        return view;
    }


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

        String listContent[] = {"Larry", "Moe", "Curly"}; 
        setListAdapter(new ArrayAdapter<String>(getActivity(), R.layout.list_item, listContent));
    }
   ...
}

当我启动我的应用程序时,我收到错误消息:

 java.lang.IllegalStateException: Activity has been destroyed
E/AndroidRuntime(  947):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
E/AndroidRuntime(  947):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
E/AndroidRuntime(  947):    at android.app.ActivityThread.access$2200(ActivityThread.java:119)
E/AndroidRuntime(  947):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
E/AndroidRuntime(  947):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  947):    at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(  947):    at android.app.ActivityThread.main(ActivityThread.java:4363)
E/AndroidRuntime(  947):    at java.lang.reflect.Method.invokeNative(Native Method)
...

它抱怨活动已被破坏,为什么???

PS main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:paddingLeft="8dp"
  android:paddingRight="8dp">

  <Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="next" />

  <ListView
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#00FF00"
    android:layout_weight="1"
    android:drawSelectorOnTop="false" />

  <TextView
    android:id="@android:id/empty"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FF0000"
    android:text="No data" />
</LinearLayout>

Answer 1

我也遇到过类似的问题.
我意识到发生这种情况是因为活动FragmentTransaction在即将到来时被破坏了.commit().

对此的解决方案是检查是否Activity.isFinishing()为真.

if (!isFinishing()) {
  FragmentTransaction ft = getSupportFragmentManager()
     .beginTransaction();
  ft.replace(SOME_RES_ID, myFragmentInstance);
  ft.commit();
}

Answer 2

我想通了自己,这是因为我错过了super.onCreate(savedInstanceState);我的Activity onCreate()方法.添加之后,一切都很好.

Answer 3

我遇到了同样的问题,无法修复它.事件我添加了isFinishing()检查.但没有运气.

然后我又添加了一个检查isDestroyed()并且它现在工作正常.

if (!isFinishing() && !isDestroyed()) {
  FragmentTransaction ft = getSupportFragmentManager()
     .beginTransaction();
  ft.replace(LAYOUT_ID, myFragmentInstance);
  ft.commit();
}