“指定的孩子已经有父母”错误使用FragmentStatePagerAdapater

Question

我试图实现一些类似的问题的解决方案，但他们都没有在我的情况下工作。我的情况稍有不同，因为不是从xml获取surfaceview，而是通过SurfaceView类创建它并将其添加到FrameLayout中。我这样做是因为我想在创建表面时使用mediaplayer。

logcat的

07-12 11:02:28.221: E/AndroidRuntime(7055): FATAL EXCEPTION: main 
07-12 11:02:28.221: E/AndroidRuntime(7055): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.ViewGroup.addViewInner(ViewGroup.java:3337) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.ViewGroup.addView(ViewGroup.java:3208) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.ViewGroup.addView(ViewGroup.java:3165) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.ViewGroup.addView(ViewGroup.java:3145) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:915) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.view.ViewPager.populate(ViewPager.java:1064) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.view.ViewPager.populate(ViewPager.java:911) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.View.measure(View.java:12892) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.View.measure(View.java:12892) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.View.measure(View.java:12892) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:812) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.View.measure(View.java:12892) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2268) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.View.measure(View.java:12892) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1159) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2545) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.os.Looper.loop(Looper.java:137) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at android.app.ActivityThread.main(ActivityThread.java:4507) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at java.lang.reflect.Method.invoke(Method.java:511) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 
07-12 11:02:28.221: E/AndroidRuntime(7055):  at dalvik.system.NativeStart.main(Native Method) 

我的代码如下：

VideoFragment.java

public class VideoFragment extends Fragment{ 
private static final String TAG = "Fuck this"; 
static String vpath; 
static Context cxt; 
static int pos; 
static VideoFragment newInstance(int position, Cursor cursor, Context context) { 
    pos = position; 

    cursor.moveToPosition(position); 
    vpath = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.DATA)); 
    cxt = context; 
    VideoFragment f = new VideoFragment(); 

    Bundle args = new Bundle(); 
    args.putInt("position", position); 
    f.setArguments(args); 

    return f; 
} 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    //mNum = getArguments() != null ? getArguments().getInt("num") : 1; 

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 

    View v = inflater.inflate(R.layout.full_image, container, false); 

    FrameLayout preview = (FrameLayout) v.findViewById(R.id.framelayout); 

    VidView vidview = new VidView(cxt); 
    preview.addView(vidview, pos); 
    return preview; 


} 

public class VidView extends SurfaceView implements SurfaceHolder.Callback { 
    MediaPlayer player; 
    public VidView(Context context) { 
     super(context); 
     // TODO Auto-generated constructor stub 
    } 

    @Override 
    public void surfaceCreated(SurfaceHolder holder) { 
     player = new MediaPlayer(); 

     player.setDisplay(holder); 

    try { 
     player.setDataSource(vpath); 
     player.prepare(); 
    } catch (IllegalStateException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    } 
    @Override 
    public void surfaceDestroyed(SurfaceHolder holder) { 
     if (player != null){ 
      if (player.isPlaying()) 
       player.stop(); 
     player.reset(); 
     player.release(); 
     player = null; 
     } 

    } 
    @Override 
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 

    } 

} 

的活动和FragmentStatePagerAdapater

public class FullImageActivity extends FragmentActivity { 


private static final String TAG = "MediaPlayer shit"; 
//MediaPlayer player; 
//SurfaceView surfaceview; 
SurfaceHolder surfaceHolder; 
Gridview gridview = new Gridview(); 
int width; 
int height; 
Cursor cursor; 
ViewPager viewpager; 
PagerAdapter pageradapter; 
String path; 
int position; 
String[] projection = { GridviewData.ROWID, GridviewData.BITMAPPATH, GridviewData.VIDEOFILEPATH}; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.image_pager); 

    Intent i = getIntent(); 

    position = i.getExtras().getInt("position"); 
    path = i.getExtras().getString("videopath"); 


    cursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, 
           gridview.mediaColumns, 
           MediaStore.Video.Media.DATA + " like ?", 
           new String[] {Environment.getExternalStorageDirectory().getPath() + "/Reelcam/TheReelcams/%"}, 
           null); 

    pageradapter = new PagerAdapter(getSupportFragmentManager()); 
    viewpager = (ViewPager) findViewById(R.id.pager); 
    //viewpager.setOffscreenPageLimit(1); 
    viewpager.setAdapter(pageradapter); 

} 


@Override 
protected void onPause() { 

    super.onPause(); 
} 
@Override 
protected void onResume() { 
    //surfaceview.setVisibility(View.VISIBLE); 
    super.onResume(); 
} 


@Override 
protected void onDestroy() { 
    cursor.close(); 
    super.onDestroy(); 
} 

public class PagerAdapter extends FragmentStatePagerAdapter{ 
    public PagerAdapter(FragmentManager fm) { 
     super(fm); 
     // TODO Auto-generated constructor stub 
    } 

    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) { 
     container.removeView((View) object);   
     } 

    @Override 
    public Fragment getItem(int position) { 
     Log.i(TAG, "in getitem"); 
     return VideoFragment.newInstance(position, cursor, getApplicationContext()); 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return cursor.getCount(); 
    } 

} 

Answer 1

这里：

View v = inflater.inflate(R.layout.full_image, container, false); 

FrameLayout preview = (FrameLayout) v.findViewById(R.id.framelayout); 

. . . . . . 

return preview; 

您充气full_image布局v。但是，您正在返回另一个ID为frameLayout的视图，该视图在布局中可能已经是父级（可能为v）。改为返回v。

请确保您返回没有父级的视图。查看R.layout.full_image并查看R.id.framelayout是否已包含在父母ViewGroup中。

Answer 2

什么线为y我们的具体错误在？这通常是由于多次将子项添加到父项引起的。例如，当您不断将曲面视图添加到片段并将曲面视图的内容设置为新内容时，片段仍会看到相同的元素。为了避免这个问题，只需设置

surfaceview = new SurfaceView() 

设置surfaceview脚趾的新内容并将其添加回您的片段。

我希望这会有所帮助。

Answer 3

这是sollution：

public class FragmentItem extends Android.Support.V4.App.Fragment 
{ 
    View rootView; 
    TextView textView; 

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     if (rootView != null) 
     { 
      ViewGroup parent = (ViewGroup)rootView.Parent; 
      parent.RemoveView(rootView); 
     } else { 
      rootView = inflater.Inflate(Resource.Layout.FragmentItem, container, false); 
      textView = rootView.FindViewById<TextView>(Resource.Id.textViewDisplay);    
     } 
     return rootView; 
    } 
}