指定的孩子已经有

Question

我在我的代码使用Fragments因为TabActivity不赞成家长例外，但我得到这个错误在我Logcat：

07-09 09:19:40.936: E/AndroidRuntime(5935): FATAL EXCEPTION: main 
07-09 09:19:40.936: E/AndroidRuntime(5935): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.view.ViewGroup.addViewInner(ViewGroup.java:1976) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.view.ViewGroup.addView(ViewGroup.java:1871) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.view.ViewGroup.addView(ViewGroup.java:1828) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.view.ViewGroup.addView(ViewGroup.java:1808) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:915) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.os.Handler.handleCallback(Handler.java:587) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.os.Handler.dispatchMessage(Handler.java:92) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.os.Looper.loop(Looper.java:130) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at android.app.ActivityThread.main(ActivityThread.java:3691) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at java.lang.reflect.Method.invoke(Method.java:507) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665) 
07-09 09:19:40.936: E/AndroidRuntime(5935):  at dalvik.system.NativeStart.main(Native Method) 

这里是我添加的代码选项卡：

public class RelatorioPontos extends FragmentActivity { 

    private FragmentTabHost mTabHost; 
    private String id; 

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

      setContentView(R.layout.relatorio_layout); 
      mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost); 
      mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent); 

      id = getIntent().getStringExtra("idPonto"); 

      Bundle args = new Bundle(); 
      args.putString("id", id); 

      mTabHost.addTab(mTabHost.newTabSpec("dados").setIndicator("Dados"), DadosPonto.class, args); 
      mTabHost.addTab(mTabHost.newTabSpec("analises").setIndicator("Análises"), AnalisesPonto.class, args); 
      mTabHost.addTab(mTabHost.newTabSpec("multimidia").setIndicator("Multimídia"), ArquivosMultimidia.class, args); 
     } 


} 

这里是第一选项卡类：

public class DadosPonto extends Fragment{ 

    Ponto ponto = new Ponto(); 
    private String id; 

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

     id = getArguments().getString("id"); 

     PontoDAO pdao = new PontoDAO(getActivity().getApplicationContext()); 
     ponto = pdao.retornaPonto(id); 
    } 

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

     if (container == null) { 
      return null; 
     } 

     View view = inflater.inflate(R.layout.dados_ponto_layout, container, false); 

     View idPonto = view.findViewById(R.id.idPonto); 
     View idUser = view.findViewById(R.id.idUser); 
     View pontoNome = view.findViewById(R.id.nomePonto); 
     View dtCampo = view.findViewById(R.id.dtCampo); 
     View projeto = view.findViewById(R.id.projeto); 
     View UTMEste = view.findViewById(R.id.utmEste); 
     View UTMNorte = view.findViewById(R.id.utmNorte); 
     View UTMFuso = view.findViewById(R.id.utmFuso); 
     View UTMHemisferio = view.findViewById(R.id.utmHemisferio); 
     View latDec = view.findViewById(R.id.latDec); 
     View longDec = view.findViewById(R.id.longDec); 
     View altitude = view.findViewById(R.id.altitude); 
     View localidade = view.findViewById(R.id.localidade); 
     View outrasUG = view.findViewById(R.id.outrasUG); 
     View descPonto = view.findViewById(R.id.descPonto); 
     View complemento = view.findViewById(R.id.complemento); 
     View equipe = view.findViewById(R.id.equipe); 
     View fonteUG = view.findViewById(R.id.fonteUG); 

     ((TextView) idPonto).setText("Id do ponto: " + ponto.getIdPonto()); 
     ((TextView) idUser).setText("Id do usuário: " + ponto.getIdUsuario()+""); 
     ((TextView) pontoNome).setText("Nome do ponto: " + ponto.getPontoNome()); 
     ((TextView) dtCampo).setText("Data do campo: " + ponto.getDtCampo()); 
     ((TextView) projeto).setText("Projeto: " + ponto.getProjeto()+""); 
     ((TextView) UTMEste).setText("UTM Este: " + String.valueOf(ponto.getUTMEste())); 
     ((TextView) UTMNorte).setText("UTM Norte: " + String.valueOf(ponto.getUTMNorte())); 
     ((TextView) UTMFuso).setText("UTM Fuso: " + ponto.getUTMFuso()+""); 
     ((TextView) UTMHemisferio).setText("UTM Hemisfério: " + ponto.getUTMHemisferio()); 
     ((TextView)latDec).setText("Latitude decimal: " + String.valueOf(ponto.getLatDec())); 
     ((TextView)longDec).setText("Longitude decimal: " + String.valueOf(ponto.getLongDec())); 
     ((TextView)altitude).setText("Altitude: " + ponto.getAltitude()+""); 
     ((TextView)localidade).setText("Localidade: " + ponto.getLocalidade()); 
     ((TextView)outrasUG).setText("Outras Unidades Geológicas: " + ponto.getOutrasUG()); 
     ((TextView)descPonto).setText("Descrição do ponto: " + ponto.getDescPonto()); 
     ((TextView)complemento).setText("Complemento da descrição: " + ponto.getComplement()); 
     ((TextView)equipe).setText("Equipe: " + ponto.getEquipe()); 
     ((TextView)fonteUG).setText("Fonte da Unidade Geológica: " + ponto.getFonteUG()); 

     return view; 
    } 
} 

而第二个选项卡活动：

public class AnalisesPonto extends ListFragment { 

    private ArrayList<AnaliseEstrutural> analises; 
    AnalisesDAO andao; 
    String idPonto; 


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

     idPonto = getArguments().getString("id"); 



     if (container == null) { 
      return null; 
     } 

     View lista = inflater.inflate(R.layout.analises_ponto_layout, container, false); 

     //ListView analisesList = (ListView) lista.findViewById(android.R.id.list); 
     View analisesList = (ListView) lista.findViewById(android.R.id.list); 

     andao = new AnalisesDAO(getActivity().getApplicationContext()); 
     analises = andao.relatorioAnalises(idPonto); 

     AnalisesAdapter analisesAdapter = new AnalisesAdapter(getActivity().getApplicationContext()); 
     for(int j = 0; j < analises.size(); j++) { 
      analisesAdapter.add(analises.get(j)); 
     } 

     return analisesList; 
    }  
} 

第三类代码是相同的，第二个，所以我会不会在这里发布，第一个选项卡工作得很好，但是当我在进入第二个我得到这个例外。

我的疑问是如何处理这个异常？

Answer 1

当发生配置更改时（例如屏幕方向），很可能您会得到此异常。它抱怨说视图仍然附着在先前的视图层次结构中，因此您需要将其删除并重新附加到当前视图。

public class DadosPonto extends Fragment{ 

    // Keep a reference to the view; 
    private View view; 

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

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     if (view == null) { 
      view = inflater.inflate(R.layout.dados_ponto_layout, container, false); 
      View idPonto = view.findViewById(R.id.idPonto); 
      // ..... 
     } else { 
      // If we are returning from a configuration change: 
      // "view" is still attached to the previous view hierarchy 
      // so we need to remove it and re-attach it to the current one 
      ViewGroup parent = (ViewGroup) view.getParent(); 
      parent.removeView(view); 
     } 
     return view; 
    } 
}