您好，感谢您的帮助。
我刚刚开始配置我的代码来处理旋转:我已经实现了 onDestroy()，但还没有任何 onSaveInstanceState() 或 onRetainNonConfigurationInstance()，因为我正在弄清楚如果销毁和重新创建什么不会导致问题旋转后需要保存的内容。
在我的应用程序中，我使用运行 AsyncTask 的服务和 3 个在用户按下按钮时交换的 fragment 。
我使用兼容性库来管理 fragment 。
我怀疑我遇到的错误与 fragment 有关；
具体来说，我更希望 fragment 在旋转时被销毁并重新创建，而不是保留它们 (因为我希望这会使我的代码更简单...)
当我旋转模拟器时，标题中出现错误。
这是主要 Activity 的代码:
public class Quotes extends FragmentActivity {
private String url2;
//public String responseBody;
public static ArrayList<Stock> lt;
public static ArrayList<Stock> best;
public static ArrayList<Stock> worst;
public static ArrayList<Stock> fav;// =new ArrayList<Stock>();
public static LocalService mService;
boolean mBound;// = false;
public MyAdapter myAdap;
public Messenger messenger;
public Messenger messenger2;
public Grab g;
public static Handler handler;
public static Handler handler2;
public Intent intent;
public ListView lv;
public dettagliofragment fragment;
public listafragment fragmentlista ;
public static boolean tablet;//=true;
public static WorstBest worstbest;
public static favouritesFragment fragmentfavourites;
public static FragmentActivity fragmentActivity;
public static int stack;
public static ArrayList<Integer> stackArray; // stackArray =new ArrayList<Integer>();
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
stackArray =new ArrayList<Integer>();
fav =new ArrayList<Stock>();
tablet=true;
mBound = false;
fragmentActivity = this;
setContentView(R.layout.splash);
url2=getString(R.string.url2);
g = new Grab(url2);
String s = g.vai();
//Log.e("", s);
Log.e("", "passo oltre l'invocazione al grab");
lt = new MyParser(s).parseResp();
fragmentlista = new listafragment();
fragmentfavourites= new favouritesFragment() ;
worstbest = new WorstBest();
/////////////////primo message handler
handler=new Handler() {
@Override
public void handleMessage(Message msg) {
Message mess=msg;
Log.e("","MESSAGGIO RICEVUTO");
lt = mService.ritira();
Log.e("what?", Integer.toString(mess.what));
if( mess.what==0){
worst=mService.ritiraWorst();
best=mService.ritiraBest();
fav=mService.ritiraFav();
setContentView(R.layout.main);
View view1=(View)findViewById(R.id.view1);
View view2=(View)findViewById(R.id.view2);
if(view2==null) {tablet=false;};
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.view1, fragmentlista);
if(tablet){fragmentTransaction.add(R.id.view2, worstbest);}
fragmentTransaction.commit();
g.fermaGrab();
Log.e("", "fermograb");
};
}
};
messenger = new Messenger(handler);
intent = new Intent(this, LocalService.class);
intent.putExtra("messenger", messenger);
/////////////////secondo message handler
handler2=new Handler() {
@Override
public void handleMessage(Message msg) {
Message mess=msg;
Log.e("","SECONDO MESSAGGIO RICEVUTO");
lt = mService.ritira();
worst=mService.ritiraWorst();
best=mService.ritiraBest();
fav=mService.ritiraFav();
if(lt==null){Log.e("","lt è nullo");};
if(fragmentlista==null){Log.e("","fragmentlista è nullo");};
fragmentlista.prendiLista(lt);
worstbest.prendiListaWorst(worst);
worstbest.prendiListaBest(best);
if(fav.size()>0)fragmentfavourites.prendiLista(fav);
};
};
messenger2 = new Messenger(handler2);
intent.putExtra("messenger2", messenger2);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}
public static void layoutSchermo(int conf){
if(conf==1){
FragmentManager fragmentManager = fragmentActivity.getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
if(!tablet){fragmentTransaction.replace(R.id.view1, fragmentfavourites);}
if(tablet){fragmentTransaction.replace(R.id.view2, fragmentfavourites);}
fragmentTransaction.addToBackStack(null);
stack=fragmentTransaction.commit();
stackArray.add(stack);
Log.e("","stack = "+ Integer.toString(stack));
}
if(conf==2){
FragmentManager fragmentManager = fragmentActivity.getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right);
if(!tablet){fragmentTransaction.replace(R.id.view1, worstbest);}
if(tablet){fragmentTransaction.replace(R.id.view2, worstbest);}
fragmentTransaction.addToBackStack(null);
stack= fragmentTransaction.commit();
stackArray.add(stack);
Log.e("","stack = "+ Integer.toString(stack));
}
}
@Override
public void onBackPressed(){
FragmentManager fragmentManager = fragmentActivity.getSupportFragmentManager();
if(stackArray.size()>0)
{for(int i=1;i<stackArray.size();i++){
fragmentManager.popBackStackImmediate(stackArray.get(i), FragmentManager.POP_BACK_STACK_INCLUSIVE);}
}
super.onBackPressed();
}
protected void onStop() {
Log.e("onstop","passo per onstop");
mService.stop();
g.fermaGrab();
super.onStop();
}
protected void onPause() {
Log.e("onpause","passo per onpause");
mService.stop();
g.fermaGrab();
super.onPause();
}
protected void onDestroy() {
Log.e("ondestroy","passo per ondestroy");
mService.stop();
g.fermaGrab();
//handler.removeMessages(333);
stopService(intent);
//g=null;
FragmentManager fragmentManager = fragmentActivity.getSupportFragmentManager();
if(stackArray.size()>0)
{for(int i=1;i<stackArray.size();i++){
fragmentManager.popBackStackImmediate(stackArray.get(i), FragmentManager.POP_BACK_STACK_INCLUSIVE);}
}
super.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) { }
public static ArrayList<Stock> dammi(){
return lt;
}
public void inizia()
{
Log.e("","il serlizio è bound ? "+ mBound);
mService.prendi(lt);
mService.getNumber();
}
private ServiceConnection mConnection = new ServiceConnection() {
//@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
Log.e("", "sono in ServiceConnection");
// We've bound to LocalService, cast the IBinder and get LocalService instance
LocalBinder binder = (LocalBinder) service;
mService = binder.getService();
mBound = true;
//inizia();
mService.prendi(lt);
mService.getNumber();
}
//@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
mService = null;
}
};
他是我的 LogCat:
01-06 12:20:27.869: E/AndroidRuntime(2165): FATAL EXCEPTION: main
01-06 12:20:27.869: E/AndroidRuntime(2165): java.lang.RuntimeException: Unable to destroy activity {com.example.quotes/com.example.quotes.Quotes}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3273)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3291)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3489)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.ActivityThread.access$700(ActivityThread.java:130)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.os.Handler.dispatchMessage(Handler.java:99)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.os.Looper.loop(Looper.java:137)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.ActivityThread.main(ActivityThread.java:4745)
01-06 12:20:27.869: E/AndroidRuntime(2165): at java.lang.reflect.Method.invokeNative(Native Method)
01-06 12:20:27.869: E/AndroidRuntime(2165): at java.lang.reflect.Method.invoke(Method.java:511)
01-06 12:20:27.869: E/AndroidRuntime(2165): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-06 12:20:27.869: E/AndroidRuntime(2165): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-06 12:20:27.869: E/AndroidRuntime(2165): at dalvik.system.NativeStart.main(Native Method)
01-06 12:20:27.869: E/AndroidRuntime(2165): Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1314)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.support.v4.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:480)
01-06 12:20:27.869: E/AndroidRuntime(2165): at com.example.quotes.Quotes.onDestroy(Quotes.java:201)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.Activity.performDestroy(Activity.java:5172)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1109)
01-06 12:20:27.869: E/AndroidRuntime(2165): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3260)
01-06 12:20:27.869: E/AndroidRuntime(2165): ... 12 more
非常感谢您的帮助!!!
最佳答案
感谢您的信息。同时，我解决了这个问题。
导致问题的原因是当 Activty 由于旋转而被销毁时需要解除绑定(bind)的服务。
据我所知，当 Activity 被销毁时， fragment 不会被销毁。但是，如果对此有任何评论，我将不胜感激。
因此，当 Activty 在销毁后再次创建时，我在 onCreate() 方法上重新初始化了 Fragment，这不会给应用程序带来麻烦。
protected void onDestroy() {
mService.stop();
stopService(new Intent(this, LocalService.class));
unbindService(mConnection);
g.fermaGrab();
stopService(intent);
Log.e("ondestroy","passostopService(intent)");
super.onDestroy();
}
关于android - 在旋转时我得到 "Unable to destroy activity ... Can not perform this action after onSaveInstanceState"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14182432/