我在我的代码中使用Fragments，因为TabActivity已被弃用，但我在Logcat中收到此错误：
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)
以下是我添加标签的代码：
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);
}
}
以下是第一个标签类：
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;
}
}
第二个标签活动：
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;
}
}
第三类代码与第二类代码相同，所以我不会在这里发布，第一个选项卡效果很好但是当我进入第二个选项卡时，我得到了这个例外。
我怀疑我是如何处理这个例外的？
答案 0 :(得分：10)
最有可能在发生配置更改时遇到此异常，例如屏幕方向。它抱怨视图仍然附加到先前的视图层次结构，因此您需要将其删除并将其重新附加到当前视图层次结构中。
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;
}
}