Android IllegalStateException：指定的孩子已经有一个家长

Question

我得到这个IllegalStateException，如标题中所述，我知道这是因为某处我添加一个已经有父母的视图，但我找不到在哪里？我已经尝试了几种不同的解决方案，我发现了其他人有这个问题，但它没有奏效，因为他们似乎得到了另一个来源的问题比我。帮助将非常感谢！

错误堆栈：

10-26 17:46:54.783: E/AndroidRuntime(14255): FATAL EXCEPTION: main 
10-26 17:46:54.783: E/AndroidRuntime(14255): Process: com.example.digiexammobile, PID: 14255 
10-26 17:46:54.783: E/AndroidRuntime(14255): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.addViewInner(ViewGroup.java:3562) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.addView(ViewGroup.java:3415) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.addView(ViewGroup.java:3360) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.addView(ViewGroup.java:3336) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:951) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.view.ViewPager.populate(ViewPager.java:1073) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.view.ViewPager.populate(ViewPager.java:919) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.View.measure(View.java:16521) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.View.measure(View.java:16521) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.View.measure(View.java:16521) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2552) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.View.measure(View.java:16521) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1915) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1109) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1291) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5603) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.Choreographer.doCallbacks(Choreographer.java:574) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.Choreographer.doFrame(Choreographer.java:544) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.os.Handler.handleCallback(Handler.java:733) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.os.Handler.dispatchMessage(Handler.java:95) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.os.Looper.loop(Looper.java:136) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at android.app.ActivityThread.main(ActivityThread.java:5146) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at java.lang.reflect.Method.invokeNative(Native Method) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at java.lang.reflect.Method.invoke(Method.java:515) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132) 
10-26 17:46:54.783: E/AndroidRuntime(14255): at dalvik.system.NativeStart.main(Native Method) 

我找不到任何在这里我的文件的内容？我建立在标准的选项卡式应用程序之上（来自eclipse的创建应用程序指南），但我已经改变了一些东西到支持库的替代品，以便与SwipeRefreshLayout一起使用它。

我MainActivity.java：

package com.example.digiexammobile; 

import java.util.Locale; 

import android.app.ActionBar.Tab; 
import android.app.ActionBar; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.os.Bundle; 
import android.support.v4.view.ViewPager; 
import android.view.Menu; 
import android.view.MenuItem; 


public class MainActivity extends FragmentActivity implements ActionBar.TabListener { 

    /** 
    * The {@link android.support.v4.view.PagerAdapter} that will provide 
    * fragments for each of the sections. We use a 
    * {@link FragmentPagerAdapter} derivative, which will keep every 
    * loaded fragment in memory. If this becomes too memory intensive, it 
    * may be best to switch to a 
    * {@link android.support.v13.app.FragmentStatePagerAdapter}. 
    */ 
    SectionsPagerAdapter mSectionsPagerAdapter; 

    /** 
    * The {@link ViewPager} that will host the section contents. 
    */ 
    ViewPager mViewPager; 
    NWManager nwmanager; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     // Set up the action bar. 
     final ActionBar actionBar = getActionBar(); 
     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 

     // Create the adapter that will return a fragment for each of the three 
     // primary sections of the activity. 
     mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 
     nwmanager = new NWManager(); 

     // Set up the ViewPager with the sections adapter. 
     mViewPager = (ViewPager) findViewById(R.id.pager); 
     mViewPager.setAdapter(mSectionsPagerAdapter); 

     // When swiping between different sections, select the corresponding 
     // tab. We can also use ActionBar.Tab#select() to do this if we have 
     // a reference to the Tab. 
     mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { 
      @Override 
      public void onPageSelected(int position) { 
       actionBar.setSelectedNavigationItem(position); 
      } 
     }); 

     // For each of the sections in the app, add a tab to the action bar. 
     for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) { 
      // Create a tab with text corresponding to the page title defined by 
      // the adapter. Also specify this Activity object, which implements 
      // the TabListener interface, as the callback (listener) for when 
      // this tab is selected. 
      actionBar.addTab(
        actionBar.newTab() 
          .setText(mSectionsPagerAdapter.getPageTitle(i)) 
          .setTabListener(this)); 
     } 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    @Override 
    public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) { 
     mViewPager.setCurrentItem(tab.getPosition()); 

    } 


    @Override 
    public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) { 
     // TODO Auto-generated method stub 

    } 


    @Override 
    public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) { 
     // TODO Auto-generated method stub 

    } 

    /** 
    * A {@link FragmentPagerAdapter} that returns a fragment corresponding to 
    * one of the sections/tabs/pages. 
    */ 
    public class SectionsPagerAdapter extends FragmentPagerAdapter { 

     Fragment[] fragments = new Fragment[this.getCount()]; 

     public SectionsPagerAdapter(FragmentManager fm) { 
      super(fm); 
     } 

     @Override 
     public Fragment getItem(int position) { 
      // getItem is called to instantiate the fragment for the given page. 
      if(fragments[position] == null){ 
       fragments[position] = (Fragment) LibraryListFragment.newInstance(nwmanager); 
      } 

      return fragments[position]; 
     } 

     @Override 
     public int getCount() { 
      // Show 2 total pages. 
      return 2; 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
      Locale l = Locale.getDefault(); 
      switch (position) { 
       case 0: 
        return getString(R.string.title_section1).toUpperCase(l); 
       case 1: 
        return getString(R.string.title_section2).toUpperCase(l); 
      } 
      return null; 
     } 
    } 
} 

LibraryListFragment.java：

package com.example.digiexammobile; 

import android.support.v4.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.BaseAdapter; 
import android.widget.ListView; 

public class LibraryListFragment extends Fragment { 

    BaseAdapter listadapter; 
    NWManager nwmanager; 

    public static LibraryListFragment newInstance(NWManager nwmanager){ 
     LibraryListFragment fragment = new LibraryListFragment(); 
     fragment.nwmanager = nwmanager; 
     return fragment; 
    } 

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

     View rootView = inflater.inflate(R.layout.fragment_librarylist, container); 

     final String[] values = new String[] { "Android", "iPhone", "WindowsMobile", 
      "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X", 
      "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X", 
      "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X", 
      "Linux", "OS/2" }; // You have the necessary data to bind the list. 

     final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), 
     android.R.layout.simple_list_item_1, android.R.id.text1, values); // You have set  the previous array to an adapter that can be now setted to a list. 

     ListView list = (ListView) rootView.findViewById(R.id.librarylist); 
     list.setAdapter(adapter); 

     return rootView; 
    } 

    public void notifyDataSetChanged(){ 
     listadapter.notifyDataSetChanged(); 
    } 

} 

最后我fragment_librarylist.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.SwipeRefreshLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/swipe_container" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <ListView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/librarylist"> 
    </ListView> 

</android.support.v4.widget.SwipeRefreshLayout> 

提前非常感谢！

Answer 1

内LibraryListFragmentonCreateView，改变这种：

View rootView = inflater.inflate(R.layout.fragment_librarylist, container); 

这样：

View rootView = inflater.inflate(R.layout.fragment_librarylist, container, false);