在適配器中使用佈局充氣器時出現IllegalStateException

Question

我有一個僅包含GridView的片段，我有一個適配器使用LayoutInflater從XML創建其視圖。下面是我的片段：

public class MagazineFragment extends SherlockFragment{ 
private GridView mGridView; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    return inflater.inflate(R.layout.magazine_grid, container); 
} 

@Override 
public void onViewCreated(View view, Bundle savedInstanceState) { 
    super.onViewCreated(view, savedInstanceState); 
    mGridView = (GridView)view.findViewById(R.id.grid_view); 
    mGridView.setAdapter(new MagazineAdapter(getActivity(), savedInstanceState)); 
} 

class MagazineAdapter extends BaseAdapter{ 
    int[] mImages; 
    private Context mContext; 
    private Bundle mSavedInstanceState; 

    public MagazineAdapter(Context context, Bundle savedInstanceState) { 
     mContext = context; 
     mSavedInstanceState = savedInstanceState; 
     mImages = getResources().getIntArray(R.array.magazines); 
    } 

    @Override 
    public int getCount() { 
     return mImages.length; 
    } 

    @Override 
    public Object getItem(int position) { 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     final ImageView imageView; 
     if(convertView == null){ 
      imageView = (ImageView)getLayoutInflater(mSavedInstanceState).inflate(R.layout.magazine_grid_item, parent, false); 
     }else{ 
      imageView = (ImageView)convertView; 
     } 

     imageView.setImageResource(mImages[position]); 
     return imageView; 
    } 

} 

}

和magazine_grid.xml：

<?xml version="1.0" encoding="utf-8"?> 
<GridView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/grid_view" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:columnWidth="150dip" 
    android:numColumns="auto_fit" 
    android:gravity="center" 
    android:stretchMode="columnWidth" 
    android:scrollbarStyle="outsideOverlay" 
    android:padding="4dip"/> 

和magazine_grid_item.xml：

<?xml version="1.0" encoding="utf-8"?> 
<ImageView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="150dip" 
    android:layout_height="200dip" 
    android:adjustViewBounds="true" 
    android:scaleType="fitCenter" 
    android:paddingTop="6dip" 
    android:paddingBottom="6dip" 
    android:paddingLeft="2dip" 
    android:paddingRight="2dip"/> 

日誌消息：

12-19 08:38:36.675: E/AndroidRuntime(11977): FATAL EXCEPTION: main 12-19 08:38:36.675: E/AndroidRuntime(11977): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.coderdem.android.zaytung/com.coderdem.android.zaytung.MainActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 12-19 08:38:36.675: E/AndroidRuntime(11977):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.app.ActivityThread.access$600(ActivityThread.java:127) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.os.Handler.dispatchMessage(Handler.java:99) 12-19 08:38:36.675: E/AndroidRuntime(11977):  at android.os.Looper.loop(Looper.java:137) 12-19 08:38:36.675: E/AndroidRuntime(11977):  at android.app.ActivityThread.main(ActivityThread.java:4511) 12-19 08:38:36.675: E/AndroidRuntime(11977): at java.lang.reflect.Method.invokeNative(Native Method) 12-19 08:38:36.675: E/AndroidRuntime(11977): at java.lang.reflect.Method.invoke(Method.java:511) 12-19 08:38:36.675: E/AndroidRuntime(11977): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980) 12-19 08:38:36.675: E/AndroidRuntime(11977):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747) 12-19 08:38:36.675: E/AndroidRuntime(11977): at dalvik.system.NativeStart.main(Native Method) 12-19 08:38:36.675: E/AndroidRuntime(11977): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.view.ViewGroup.addViewInner(ViewGroup.java:3342) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.view.ViewGroup.addView(ViewGroup.java:3213) 12-19 08:38:36.675: E/AndroidRuntime(11977):  at android.view.ViewGroup.addView(ViewGroup.java:3170) 12-19 08:38:36.675: E/AndroidRuntime(11977):  at android.view.ViewGroup.addView(ViewGroup.java:3150) 12-19 08:38:36.675: E/AndroidRuntime(11977):  at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:915) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:551) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1136) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.app.Activity.performStart(Activity.java:4480) 12-19 08:38:36.675: E/AndroidRuntime(11977): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1940) 12-19 08:38:36.675: E/AndroidRuntime(11977): ... 11 more 

我做錯了什麼？

Answer 1

你onCreateView：

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    // why? 
    container.removeAllViews(); 
    return inflater.inflate(R.layout.magazine_grid, container); 
} 

不正確。嘗試像這樣修改它：

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    // Android will attach the view returned by this method on its own so don't 
    // add it yourself to the container 
    return inflater.inflate(R.layout.magazine_grid, container, false); 
} 

Answer 2

使用此代碼在您的MagazineFragment類剛剛到位Overrided方法 公共查看getView（）的

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    //Use here parent to remove previouse view 
     parent.removeAllViews(); 
     //this create a new view. 
    final ImageView imageView; 
    if(convertView == null){ 
     imageView = (ImageView)getLayoutInflater(mSavedInstanceState).inflate(R.layout.magazine_grid_item, parent, false); 
    }else{ 
     imageView = (ImageView)convertView; 
    } 

    imageView.setImageResource(mImages[position]); 
    return imageView; 
} 

這可能會幫助你。