获取“特定的孩子已经有父母。”

错误日志：

06-08 10:02:24.116 18960-18960/com.example.itachiuchiha.crimeintent E/AndroidRuntime: FATAL EXCEPTION: main 
Process: com.example.itachiuchiha.crimeintent, PID: 18960 
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.itachiuchiha.crimeintent/com.example.itachiuchiha.crimeintent.CrimeListActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2357) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2419) 
    at android.app.ActivityThread.access$900(ActivityThread.java:154) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:135) 
    at android.app.ActivityThread.main(ActivityThread.java:5293) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:372) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699) 
Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
    at android.view.ViewGroup.addViewInner(ViewGroup.java:3937) 
    at android.view.ViewGroup.addView(ViewGroup.java:3787) 
    at android.view.ViewGroup.addView(ViewGroup.java:3728) 
    at android.view.ViewGroup.addView(ViewGroup.java:3701) 
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1083) 
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252) 
    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:742) 
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617) 
    at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:339) 
    at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:601) 
    at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1236) 
    at android.app.Activity.performStart(Activity.java:6006) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2320) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2419)  
    at android.app.ActivityThread.access$900(ActivityThread.java:154)  
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)  
    at android.os.Handler.dispatchMessage(Handler.java:102)  
    at android.os.Looper.loop(Looper.java:135)  
    at android.app.ActivityThread.main(ActivityThread.java:5293)  
    at java.lang.reflect.Method.invoke(Native Method)  
    at java.lang.reflect.Method.invoke(Method.java:372)  
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)  
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)  06-08 10:02:25.528 18960-18960/com.example.itachiuchiha.crimeintent I/Process: Sending signal. PID: 18960 SIG: 9

CrimeListActivity类：

package com.example.itachiuchiha.crimeintent; 

    import android.support.v4.app.Fragment; 

    public class CrimeListActivity extends SingleFragmentActivity { 
     @Override 
     protected Fragment createFragment() { 
      return new CrimeListFragment(); 
     } 
    }

CrimeListFragment类：

package com.example.itachiuchiha.crimeintent; 

    import android.os.Bundle; 
    import android.support.v4.app.Fragment; 
    import android.support.v7.widget.LinearLayoutManager; 
    import android.support.v7.widget.RecyclerView; 
    import android.view.LayoutInflater; 
    import android.view.View; 
    import android.view.ViewGroup; 
    //import android.widget.CheckBox; 
    import android.widget.TextView; 
    import android.widget.Toast; 

    import java.util.List; 


    public class CrimeListFragment extends Fragment { 
     public RecyclerView recyclerView; 
     public CrimeAdapter crimeAdapter; 
     @Override 
     public View. onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){ 
      View view=inflater.inflate(R.layout.fragment_crime_list,container); 
         recyclerView=(RecyclerView)view.findViewById(R.id.crime_recycler_view); 
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 
      updateUI(); 
      return view; 
     } 
     private void updateUI(){ 
      CrimeLab crimeLab; 
       crimeLab =  CrimeLab.get(getActivity()); 
      List<Crime>  crimes=crimeLab.getCrimeList(); 
      crimeAdapter=new  CrimeAdapter(crimes); 
      recyclerView.setAdapter(crimeAdapter); 
     } 
     private class CrimeHolder extends  RecyclerView.ViewHolder implements. View.OnClickListener{ 
      public TextView titleText; 
    //  public TextView dateText; 
    //  public CheckBox solvedCheck; 
      public Crime crime; 
      public CrimeHolder(View itemView){ 
       super(itemView); 
        itemView.setOnClickListener(this); 
       titleText=(TextView)itemView;//.findViewById(R.id.list_item_crime_title_text_view); 
//      dateText=(TextView)itemView.findViewById(R.id.list_item_crime_date_text_view); 
    //   solvedCheck=(CheckBox) itemView.findViewById(R.id.list_item_crime_solved_check_box); 

     } 
      public void bindCrime(Crime mcrime){ 
        crime=mcrime; 
       titleText.setText(crime.getCrimeTitle()); 
//    dateText.setText(crime.getDate().toString()); 
//   solvedCheck.setChecked(crime.isSolved()); 
     } 

     @Override 
     public void onClick(View vo) { 
      Toast.makeText(getActivity(),crime.getCrimeTitle()+"clicked",Toast.LENGTH_SHORT).show(); 
     } 
    } 
    private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder>{ 
     private List<Crime> crimes; 
     public CrimeAdapter(List<Crime> crimess){ 
      crimes=crimess; 
     } 
     @Override 
     public CrimeHolder onCreateViewHolder(ViewGroup parent,int viewType){ 
      LayoutInflater layoutInflater=LayoutInflater.from(getActivity()); 
      View vh=layoutInflater.inflate(android.R.layout.simple_list_item_1,parent,false); 
      return new CrimeHolder(vh); 
     } 

     @Override 
     public void onBindViewHolder(CrimeHolder holder, int position) { 
      Crime crime=crimes.get(position); 
      holder.bindCrime(crime); 
     } 

     @Override 
     public int getItemCount() { 
      return crimes.size(); 
     } 
    } 
}

SingleFragmentActivity等级：

package com.example.itachiuchiha.crimeintent; 

import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentManager; 


public abstract class SingleFragmentActivity extends FragmentActivity{ 
    protected abstract Fragment createFragment(); 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_fragment); 
     FragmentManager fm=getSupportFragmentManager(); 
     Fragment fragment=fm.findFragmentById(R.id.fragmet_container); 
     if(fragment==null){ 
      fragment=createFragment(); 
      fm.beginTransaction().add(R.id.fragmet_container,fragment).commit(); 
     } 

    } 
}

犯罪类：

package com.example.itachiuchiha.crimeintent; 

import java.util.Date; 
import java.util.UUID; 

public class Crime { 
    public UUID crimeID; 
    public String crimeTitle; 
    public Date date; 
    public boolean isSolved; 
    public Crime(){ 
     crimeID=UUID.randomUUID(); 
     this.date=new Date(); 
    } 

    public boolean isSolved() { 
     return isSolved; 
    } 

    public void setSolved(boolean solved) { 
     isSolved = solved; 
    } 

    public Date getDate() { 
     return date; 
    } 

    public void setDate(Date date) { 
     this.date = date; 
    } 



    public UUID getCrimeID() { 
     return crimeID; 
    } 


    public String getCrimeTitle() { 
     return crimeTitle; 
    } 

    public void setCrimeTitle(String crimeTitle) { 
     this.crimeTitle = crimeTitle; 
    } 
}

CrimeLab类：

package com.example.itachiuchiha.crimeintent; 


    import android.content.Context; 

    import java.util.ArrayList; 
    import java.util.List; 
    import java.util.UUID; 


    public class CrimeLab { 
     public static CrimeLab crimeLab; 
     public List<Crime> crimeList; 
     public static CrimeLab get(Context context){ 
      if(crimeLab==null){ 
       crimeLab=new CrimeLab(context); 
      } 
      return crimeLab; 
     } 
     private CrimeLab(Context context){ 
      crimeList=new ArrayList<>(); 
      for(int i=0;i<100;i++){ 
       Crime crime=new Crime(); 
       crime.setCrimeTitle("Crime #"+i); 
       crime.setSolved(i%2==0); 
       crimeList.add(crime); 
      } 
     } 
     public List<Crime> getCrimeList(){ 
      return crimeList; 
     } 
     public Crime getCrimebyUUID(UUID id){ 
      for (Crime crime:crimeList){ 
       if(crime.getCrimeID().equals(id)){ 
        return crime; 
       } 
      } 
      return null; 
     } 
    }

fragment_crime_list.XML：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_height="wrap_content" 
    android:layout_width="wrap_content"> 
<android.support.v7.widget.RecyclerView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_height="match_parent" 
    android:layout_width="match_parent" 
    android:id="@+id/crime_recycler_view"> 

</android.support.v7.widget.RecyclerView> 
</RelativeLayout>

activity_fragment.XML：

<?xml version="1.0" encoding="utf-8"?> 

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/fragmet_container" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"/>

如果你能解释为什么会出现这个错误，以及如何对未来进行分类，它将会很棒。

来源

2016-06-08 Akshay Milmile

in onCreateView()试试这个。

inflater.inflate(R.layout.fragment_crime_list, container, false);

根据Java文档，所述第三装置PARAM

无论充气层次应附根参数？如果为false，则root用于仅在XML中为根视图创建LayoutParams的正确子类。

来源

2016-06-08 05:40:04 Uday

谢谢你乌代！ –

很高兴帮助:) ..请标记它回答。 – Uday

获取“特定的孩子已经有父母。”

回答

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