android - 如何解决 viewpager : The specified child already has a parent. 您必须先在 child 的 parent 上调用 removeView()

Question

在我的项目中，我使用 viewpager 和三个名为 History、Main、Map 的选项卡。Main Activity 包含计时器，秒表等。 map 显示谷歌地图。现在进入 History，我只使用简单的 Textview。

Viewpager 流向:History - Main - Map

我将 Main 设置为当前项目(默认显示 Main 标记)。现在当我从 Main> Map 和 Map 滑动时> Main 完美运行。但是当从 Main> History 滑动时没有错误，而是从 History 返回到 Main( History> Main) eclipse 给我这样的错误:

E/AndroidRuntime(  533): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

仅供引用，我正在使用 intent 进入 map Activity 。请检查以下代码。请告诉我如何解决我的问题。

ViewPager 类:

@Override
    public Fragment getItem(int position) {
        // return SwipeyTabFragment.newInstance(TITLES[position]);

        Fragment f = new Fragment();

        switch (position) {
        case 0:
            f = History.newInstance(position);
            break;
        case 1:
            f = Main.newInstance(position);
            break;
        case 2:
            f = Map.newInstance(position);
            break;

        }

        return f;

    }

History.class:

public class History extends Fragment {

public static Fragment newInstance(int position) {
    History f = new History();
    Bundle args = new Bundle();

    args.putInt("title", position);
    f.setArguments(args);
    return f;

}

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    ViewGroup root = (ViewGroup) inflater.inflate(R.layout.history, null);


     ( (TextView) root.findViewById(R.id.text)).setText("Hello");
    return root;
} 

}

主类:

 public class Main extends Fragment implements GPSCallback {

 ......

public static Fragment newInstance(int position) {
    Main f = new Main();
    Bundle args = new Bundle();

    args.putInt("title", position);
    f.setArguments(args);
    return f;

}

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

    final ViewGroup root = (ViewGroup) inflater
            .inflate(R.layout.main, null);

    .......

    return root;
 }

    ........
}

map 类:

public class Map extends Fragment {

private static final String KEY_STATE_BUNDLE = "localActivityManagerState";

private LocalActivityManager mLocalActivityManager;

protected LocalActivityManager getLocalActivityManager() {
    return mLocalActivityManager;
}

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

    Bundle state = null;
    if (savedInstanceState != null) {
        state = savedInstanceState.getBundle(KEY_STATE_BUNDLE);
    }

    mLocalActivityManager = new LocalActivityManager(getActivity(), true);
    mLocalActivityManager.dispatchCreate(state);
}



public static Fragment newInstance(int position) {
    Map f = new Map();
    Bundle args = new Bundle();

    args.putInt("title", position);
    f.setArguments(args);
    return f;

}


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

        Intent i = new Intent(getActivity(), MapViewActivity.class);
       // Intent i = new Intent(getActivity(), hellogooglemap.class);
        Window w = mLocalActivityManager.startActivity("tag", i); 

        View currentView=w.getDecorView(); 
        currentView.setVisibility(View.VISIBLE); 
        currentView.setFocusableInTouchMode(true); 
        ((ViewGroup) currentView).setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
        return currentView;


      /*ViewGroup root = (ViewGroup) inflater.inflate(R.layout.history, null);


         ( (TextView) root.findViewById(R.id.text)).setText("Hello");
        return root;*/

}


 @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBundle(KEY_STATE_BUNDLE,
                mLocalActivityManager.saveInstanceState());
    }

    @Override
    public void onResume() {
        super.onResume();
        mLocalActivityManager.dispatchResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mLocalActivityManager.dispatchPause(getActivity().isFinishing());
    }

    @Override
    public void onStop() {
        super.onStop();
        mLocalActivityManager.dispatchStop();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mLocalActivityManager.dispatchDestroy(getActivity().isFinishing());
    }

}

Logcat:

 E/AndroidRuntime(  533): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
 E/AndroidRuntime(  533):   at android.view.ViewGroup.addViewInner(ViewGroup.java:1976)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.addView(ViewGroup.java:1871)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.addView(ViewGroup.java:1828)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.addView(ViewGroup.java:1808)
 E/AndroidRuntime(  533):   at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)
 E/AndroidRuntime(  533):   at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:874)
 E/AndroidRuntime(  533):   at android.support.v4.app.FragmentManagerImpl.attachFragment(FragmentManager.java:1240)
 E/AndroidRuntime(  533):   at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:612)
 E/AndroidRuntime(  533):   at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416)
 E/AndroidRuntime(  533):   at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:431)
 E/AndroidRuntime(  533):   at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:139)
 E/AndroidRuntime(  533):   at android.support.v4.view.ViewPager.populate(ViewPager.java:804)
 E/AndroidRuntime(  533):   at android.support.v4.view.ViewPager.completeScroll(ViewPager.java:1280)
 E/AndroidRuntime(  533):   at android.support.v4.view.ViewPager.computeScroll(ViewPager.java:1176)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.drawChild(ViewGroup.java:1562)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
 E/AndroidRuntime(  533):   at android.view.View.draw(View.java:6883)
 E/AndroidRuntime(  533):   at android.widget.FrameLayout.draw(FrameLayout.java:357)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
 E/AndroidRuntime(  533):   at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
 E/AndroidRuntime(  533):   at android.view.View.draw(View.java:6883)
 E/AndroidRuntime(  533):   at android.widget.FrameLayout.draw(FrameLayout.java:357)
 E/AndroidRuntime(  533):   at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1862)
 E/AndroidRuntime(  533):   at android.view.ViewRoot.draw(ViewRoot.java:1522)
 E/AndroidRuntime(  533):   at android.view.ViewRoot.performTraversals(ViewRoot.java:1258)
 E/AndroidRuntime(  533):   at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
 E/AndroidRuntime(  533):   at android.os.Handler.dispatchMessage(Handler.java:99)
 E/AndroidRuntime(  533):   at android.os.Looper.loop(Looper.java:130)
 E/AndroidRuntime(  533):   at android.app.ActivityThread.main(ActivityThread.java:3683)
 E/AndroidRuntime(  533):   at java.lang.reflect.Method.invokeNative(Native Method)
 E/AndroidRuntime(  533):   at java.lang.reflect.Method.invoke(Method.java:507)
 E/AndroidRuntime(  533):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
 E/AndroidRuntime(  533):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
 E/AndroidRuntime(  533):   at dalvik.system.NativeStart.main(Native Method)
 W/ActivityManager(   68):   Force finishing activity      com.android.gps/.viewpager.SwipeyTabsSampleActivity
 W/ActivityManager(   68): Activity pause timeout for HistoryRecord{40716740 com.android.gps/.viewpager.SwipeyTabsSampleActivity}

谢谢。

编辑:

没有 Intent 进入 map Activity 它可以工作 pwrfect。我的意思是当我使用与历史相同的 map 时，没有任何错误。

Answer 1

我用的时候也遇到过问题

View res = inflater.inflate(R.layout.fragment_guide_search, container);

在 Fragment.onCreateView(...

你必须打电话

View res = inflater.inflate(R.layout.fragment_guide_search, container, false);

或

View res = inflater.inflate(R.layout.fragment_guide_search, null);