android - 使用 FragmentStatePagerAdapater 的“指定的孩子已经有一个父母”错误

Question

我试图实现所有类似问题的一些解决方案，但它们似乎都不适用于我的情况。我的情况略有不同，因为我不是从 xml 获取表面视图，而是通过 SurfaceView 类创建它并将其添加到 FrameLayout。我这样做是因为我想在创建表面时使用媒体播放器。

日志猫

    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：

视频片段.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)   { 

    }

}

Activity 和 FragmentStatePagerAdapter

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();
    }

}

score 12 · Accepted Answer

这里：

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

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

. . . . . . 

return preview;

您正在将full_image布局膨胀到v. 但是您正在返回另一个 id 视图，frameLayout该视图可能已经v在布局中具有父级（可能）。v改为返回。

确保返回一个没有父视图的视图。查看R.layout.full_image并查看 ifR.id.framelayout已包含在 parentViewGroup中。

score 0 · Accepted Answer

这是解决方案：

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;
    }
}

score -1 · Accepted Answer

您的具体错误在哪一行？这通常是由于多次将孩子添加到父母中造成的。例如，当您继续将表面视图添加到片段并将表面视图的内容设置为新内容时，片段仍然会看到相同的元素。为了避免这个问题，只需设置

surfaceview = new SurfaceView()

设置surfaceview toe新内容并将其添加回您的片段。

我希望这有帮助。

android - 使用 FragmentStatePagerAdapater 的“指定的孩子已经有一个父母”错误

3 回答 3

Related

Reference