Android 3 - 조각을 프로그래밍 방식으로 추가 : 잘못된 상태 예외

Question

해당 사용자와의 상호 작용에 의해 조각을 교환하는 응용 프로그램을 작성하려고합니다. Activity의 XML에 정의 된 Fragment와 다른 Fragment를 포함해야하는 LinearLayout이 있습니다.

내 주요 활동 :

public class DashActivity extends Activity { 
private static final String TAG = "DashActivity"; 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_dashboard); 
    //-- Instantiate Fragmentstuff 
    FragmentManager fragmentManager = getFragmentManager(); 
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
    ActivitystreamFragment asf = new ActivitystreamFragment(); 

    fragmentTransaction.add(R.id.rightfrag, asf); 
    fragmentTransaction.commit(); 
    Log.i(TAG, "RightView has been committed"); 
} 

의 XML 파일 :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="horizontal" > 
    <fragment 
    android:id="@+id/fragment_dashboard" 
     android:layout_width="5dp" 
     android:layout_height="fill_parent" 
     android:layout_marginLeft="20dp" 
     android:layout_weight="0.97" 
     android:name="de.upb.cs.ginkgo.tablet.ui.fragments.DashboardFragment" > 
    <!-- Preview: layout=@layout/fragment_dashboard --> 
     </fragment> 
    <LinearLayout 
     android:id="@+id/rightfrag" 
     android:layout_width="450dp" 
     android:layout_height="match_parent" 
     android:layout_weight="1" 
     android:layout_marginTop="10dp" 
     android:layout_marginBottom="15dp" 
     android:layout_marginRight="10dp" > 
    </LinearLayout> 
</LinearLayout> 

내 조각 :

public class ActivitystreamFragment extends ListFragment { 
private static final String TAG = "ActivitystreamFragment"; 
ArrayList<Status> states; 

public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     Log.i(TAG,"Begin: Inflate"); 
     View root = inflater.inflate(R.layout.fragment_activitystream, container); 
     Log.i(TAG,"Finished: Inflate"); 
     if(root == null) 
      Log.e(TAG, "omg Inflate == null"); 
     return root; 
     } 

@Override 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    states = new ArrayList<Status>(); 
    // THE FOLLOWING HAS TO BE DELETED LATER!! 
    Profile p1 = new Profile("1", null, "Max Muster", 
      null, null, null, null, null, null, null); 
    Status status1 = new Status(p1,"Hello world", "12.02.2012", null); 
    states.add(status1); 
    // --- DELTE ---------------------------- 
    ActivitystreamAdapter asa = new ActivitystreamAdapter(getActivity(), R.layout.list_item_event, states); 
    setListAdapter(asa); 
    Log.i(TAG, "onCreate is done"); 

} 

} 

조각 XML :

<?xml version="1.0" encoding="utf-8"?> 
<ListView xmlns:android="http://schemas.android.com/apk/res/android" 

     android:id="@+id/android:list" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_weight="1" 
     android:drawSelectorOnTop="false" 
     android:background="@drawable/back_rightfrag" > 

</ListView> 

그리고 로그 캣의 출력 :

01-25 14:14:29.788: I/Process(781): Sending signal. PID: 781 SIG: 9 
01-25 14:17:32.387: I/DashActivity(814): RightView has been committed 
01-25 14:17:32.387: I/ActivitystreamFragment(814): onCreate is done 
01-25 14:17:32.397: I/ActivitystreamFragment(814): Begin: Inflate 
01-25 14:17:32.467: D/dalvikvm(814): GC_FOR_ALLOC freed 86K, 3% free 6509K/6663K, paused 59ms 
01-25 14:17:32.477: I/dalvikvm-heap(814): Grow heap (frag case) to 6.902MB for 513744-byte allocation 
01-25 14:17:32.597: D/dalvikvm(814): GC_CONCURRENT freed 3K, 3% free 7007K/7175K, paused 4ms+4ms 
01-25 14:17:32.657: I/ActivitystreamFragment(814): Finished: Inflate 
01-25 14:17:32.657: D/AndroidRuntime(814): Shutting down VM 
01-25 14:17:32.657: W/dalvikvm(814): threadid=1: thread exiting with uncaught exception (group=0x40014760) 
01-25 14:17:32.677: E/AndroidRuntime(814): FATAL EXCEPTION: main 
01-25 14:17:32.677: E/AndroidRuntime(814): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.upb.cs.ginkgo.tablet/de.upb.cs.ginkgo.tablet.ui.DashActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.ActivityThread.access$500(ActivityThread.java:122) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.os.Looper.loop(Looper.java:132) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.ActivityThread.main(ActivityThread.java:4123) 
01-25 14:17:32.677: E/AndroidRuntime(814): at java.lang.reflect.Method.invokeNative(Native Method) 
01-25 14:17:32.677: E/AndroidRuntime(814): at java.lang.reflect.Method.invoke(Method.java:491) 
01-25 14:17:32.677: E/AndroidRuntime(814): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
01-25 14:17:32.677: E/AndroidRuntime(814): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
01-25 14:17:32.677: E/AndroidRuntime(814): at dalvik.system.NativeStart.main(Native Method) 
01-25 14:17:32.677: E/AndroidRuntime(814): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.view.ViewGroup.addViewInner(ViewGroup.java:3011) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.view.ViewGroup.addView(ViewGroup.java:2900) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.view.ViewGroup.addView(ViewGroup.java:2857) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.view.ViewGroup.addView(ViewGroup.java:2837) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:787) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:977) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.BackStackRecord.run(BackStackRecord.java:638) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1309) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.Activity.performStart(Activity.java:4406) 
01-25 14:17:32.677: E/AndroidRuntime(814): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1788) 
01-25 14:17:32.677: E/AndroidRuntime(814): ... 11 more 

Answer 1

변경

View root = inflater.inflate(R.layout.fragment_activitystream, null); 

또는 더 나은에 선

View root = inflater.inflate(R.layout.fragment_activitystream, container); 

:

View root = inflater.inflate(R.layout.fragment_activitystream, container, false); 

그리고 그것은 작동합니다. 당신이 들어가기를 원하는 컨테이너에 조각을 붙이는 것이 왜 효과가 없는지 묻지 말고 ...

Answer 2

동적/제거 XML에서 추가 된 Fragments을 대체 할 수 없습니다. 원하는 것을 얻으려면 XML의 <fragment> 태그를 FrameLayout과 같이 바꿔야하고 FrameLayout에는 add과 remove 조각 만 넣어야합니다.