Android 片段中的非法状态异常
我正在做一个活动,其中包含一个片段。当按下fragment1上的一个按钮时,fragment1变为fragment2,但它表示IllegalStateException活动已被销毁 这是活动容器中的代码Android 片段中的非法状态异常,android,android-fragments,fragment,illegalstateexception,Android,Android Fragments,Fragment,Illegalstateexception,我正在做一个活动,其中包含一个片段。当按下fragment1上的一个按钮时,fragment1变为fragment2,但它表示IllegalStateException活动已被销毁 这是活动容器中的代码 public class SeleccionEjercito extends FragmentActivity implements FragmentEjercito.listener { Context contexto; Fragment firsFragment; @Override p
public class SeleccionEjercito extends FragmentActivity implements FragmentEjercito.listener {
Context contexto;
Fragment firsFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_seleccionejercito);
// Crea una instancia de FragmentEjercito
firsFragment = new FragmentEjercito();
// Añadimos el fragmento al FrameLayout contenedor
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(R.id.fragment_container,firsFragment);
ft.commit();
}
//metodo que hace la consulta a la base de datos y cambia el fragment
public void cambiarFragment()
{
Toast.makeText(getApplicationContext(), "this is my Toast message!!! =)",
Toast.LENGTH_LONG).show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_menu_principal, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void swap()
{
FragmentSectorial secondFragement = new FragmentSectorial();
//SeleccionEjercito s = new SeleccionEjercito();
FragmentTransaction ft = this.getSupportFragmentManager().beginTransaction();
//ft.remove(firsFragment);
ft.replace(R.id.fragment_container, secondFragement);
ft.addToBackStack(null);
ft.commit();
}
public void backSwap()
{
swap();
}
}
这是第一个片段中的代码
public class FragmentEjercito extends Fragment {
Button test;
private static String LOGCAT = "LogsAndroid";
listener mCallBack;
Activity mActivity;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflamos la interfaz de usuario para este fragmento
final View InputFragmentView = inflater.inflate(R.layout.fragment_ejercito, container, false);
test = (Button) InputFragmentView.findViewById(R.id.bnTest);
test.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCallBack.backSwap();
}
});
return InputFragmentView;
}
@Override
public void onAttach(Activity activity)
{
mActivity = activity;
super.onAttach(activity);
mCallBack = (listener) activity;
}
@Override
public void onDetach() {
super.onDetach();
try {
Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
childFragmentManager.setAccessible(true);
childFragmentManager.set(this, null);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
public interface listener
{
public void backSwap();
}
}
这是第二个片段
public class FragmentSectorial extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_sectorial, container, false);
}
@Override
public void onActivityCreated(Bundle state) {
super.onActivityCreated(state);
}
我把logcat放在这里了
11-12 03:01:36.301 3117-3117/armymovil E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Activity has been destroyed
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1399)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:637)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:616)
at albertorollan.armymovil.SeleccionEjercito.swap(SeleccionEjercito.java:75)
at albertorollan.armymovil.SeleccionEjercito.backSwap(SeleccionEjercito.java:80)
at albertorollan.armymovil.FragmentEjercito$1.onClick(FragmentEjercito.java:38)
at android.view.View.performClick(View.java:4240)
at android.view.View$PerformClick.run(View.java:17721)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
很可能您正试图用片段1本身的片段2替换片段1。
请尝试将swap()方法移动到主活动中,并向片段交互添加一个侦听器。通常,您不能用片段中的另一个片段替换片段。正如多布里所说,使用一个倾听者。您需要从活动实现的片段中获得一个接口 在片段中创建以下字段:
listener mCallback;
activity mActivity;
@Override
public void onAttach(Activity activity) {
mActivity=activity;
super.onAttach(activity);
mCallback = (listener) activity;
}
public interface listener {
public void backSwap();
}
在片段中创建以下方法:
listener mCallback;
activity mActivity;
@Override
public void onAttach(Activity activity) {
mActivity=activity;
super.onAttach(activity);
mCallback = (listener) activity;
}
public interface listener {
public void backSwap();
}
在片段中创建以下接口:
listener mCallback;
activity mActivity;
@Override
public void onAttach(Activity activity) {
mActivity=activity;
super.onAttach(activity);
mCallback = (listener) activity;
}
public interface listener {
public void backSwap();
}
从片段中的onCLick中删除swap(),并替换为
mCallback.backSwap();
将swap方法从片段移动到seleccionEjercito
修改活动声明以实现接口
public class SeleccionEjercito extends FragmentActivity implements fragmentEjercito.listener{ etc
最后在seleccionEjercito中创建以下方法
public void backSwap(){ swap();}
如果不让我知道的话,我希望这能起作用。首先,您需要使用片段容器作为布局(框架、线性等)
2) 然后使用FragmentManager.replace代替FragmentManager.add(在MainActivity中)
就这些 请出示你的logcat。请张贴整个堆栈张贴你的logcat堆栈跟踪张贴更新的logcat。请也张贴更新的代码。它可以工作,我在方法交换中更改了一行,你可以看到它,谢谢大家。好消息!我意识到不需要现场活动,