Android的碎片IllegalStateException異常

Question

這裏是我走對輸出：

10-09 21:57:56.344: W/dalvikvm(3141): threadid=1: thread exiting with uncaught exception (group=0x40cb8378) 
10-09 21:57:56.364: E/AndroidRuntime(3141): FATAL EXCEPTION: main 
10-09 21:57:56.364: E/AndroidRuntime(3141): java.lang.IllegalStateException: Activity has been destroyed 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1329) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:548) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:532) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.trade.MainActivity.showFragment(MainActivity.java:85) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.trade.MainActivity.showSettingsFragment(MainActivity.java:179) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.trade.Home.setting(Home.java:40) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.trade.Home.onOptionsItemSelected(Home.java:31) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.app.Activity.onMenuItemSelected(Activity.java:2534) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:353) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:964) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.android.internal.view.menu.ListMenuPresenter.onItemClick(ListMenuPresenter.java:166) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.widget.AdapterView.performItemClick(AdapterView.java:298) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.widget.AbsListView.performItemClick(AbsListView.java:1086) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.widget.AbsListView$PerformClick.run(AbsListView.java:2859) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.widget.AbsListView$1.run(AbsListView.java:3533) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.os.Handler.handleCallback(Handler.java:615) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.os.Handler.dispatchMessage(Handler.java:92) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.os.Looper.loop(Looper.java:213) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at android.app.ActivityThread.main(ActivityThread.java:4787) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at java.lang.reflect.Method.invoke(Method.java:511) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556) 
10-09 21:57:56.364: E/AndroidRuntime(3141):  at dalvik.system.NativeStart.main(Native Method) 
10-09 21:57:58.847: I/Process(3141): Sending signal. PID: 3141 SIG: 9 

唯一的例外是未知的我。請幫我理解它。

感謝

Answer 1

我會盡我所能來回答你的問題，一般在一般考慮到錯誤時拋出，因爲這是你的要求。如果您希望在應用程序中遇到特定問題的具體幫助，您需要在此發佈您的MainActivity（尤其是85行左右的部分）。

你得到的消息是一個安卓系統例外，它告訴你，你正在運行一個不再「活着」的Activity。這是非常容易實現，並具有最有可能與不當可變householding做（或在你的問題下面的評論中提到不當實例householding。不要通過new操作建立自己Activity實例）。一個例子可能是如下

import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 

public class MyActivity extends Activity { 

    public static Activity instance; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     if (instance != null) { 
      instance.setContentView(R.layout.myLayout); 
     } 

     instance = this; 

     finish(); 
     startActivity(new Intent(this, MyActivity.class)); 
    } 
} 

正如你可能在這個簡單的例子認識，變量instance只在第一次閱讀重新 -entrance到活動！但是，那裏仍然提到了舊的（現在是「死亡」）活動。那麼系統應該做什麼？對此「死」活動執行一個操作？不，它會給你上面看到的異常

所以簡而言之：很可能你有一個Fragment，Dialog或另一個UI「操作」一個「死」的活動（操作=使用對它的引用或其中的某些資源（FragmentManager ...）

正如我所說的，您的錯誤可能很容易解決，請將您的代碼給我們，我們將能夠提供幫助。但是，也許你甚至可以使用以上信息來修復它自己 - 這肯定會更滿意自己我猜:)