在應用程序處於後臺時更改語言

Question

有沒有人試過嗎？

我有一個應用程序，我已配置根據設備的區域設置使用兩種不同語言運行。

重現步驟。

（考慮到我用法語和英語）

1. 設置英語語言環境。
2. 加載應用程序。
3. 將應用程序發送到後臺。
4. 將設備區域設置更改爲法語。
5. 返回到您的應用並將其激活。
6. （全部看起來好吧..現在一切都用法語加載（因爲它應該））
7. 轉到另一個屏幕。
8. 收到NullPointerException !!!

HUH ?!

對此有何看法？

後來編輯（請求）

這裏的亞行堆棧跟蹤：

06-04 00:35:27.093: WARN/dalvikvm(18434): threadid=3: thread exiting with uncaught exception (group=0x4001dc20) 
06-04 00:35:27.093: ERROR/AndroidRuntime(18434): Uncaught handler: thread main exiting due to uncaught exception 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MyPackageName.__XXXXX__/com.MyPackageName.__XXXXX__.activity.MenuTabActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MyPackageName.__XXXXX__/com.MyPackageName.__XXXXX__.activitygroup.MyProfileActivityGroup}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MyPackageName.__XXXXX__/com.MyPackageName.__XXXXX__.activity.myprofile.DriverProfileActivity}: java.lang.NullPointerException 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.access$2200(ActivityThread.java:119) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.os.Looper.loop(Looper.java:123) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at java.lang.reflect.Method.invoke(Method.java:521) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at dalvik.system.NativeStart.main(Native Method) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MyPackageName.__XXXXX__/com.MyPackageName.__XXXXX__.activitygroup.MyProfileActivityGroup}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MyPackageName.__XXXXX__/com.MyPackageName.__XXXXX__.activity.myprofile.DriverProfileActivity}: java.lang.NullPointerException 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.startActivityNow(ActivityThread.java:2335) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:648) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.widget.TabHost.setCurrentTab(TabHost.java:320) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.widget.TabHost.addTab(TabHost.java:213) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at com.MyPackageName.__XXXXX__.activity.MenuTabActivity.onCreate(MenuTabActivity.java:80) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  ... 11 more 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MyPackageName.__XXXXX__/com.MyPackageName.__XXXXX__.activity.myprofile.DriverProfileActivity}: java.lang.NullPointerException 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.startActivityNow(ActivityThread.java:2335) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at com.MyPackageName.__XXXXX__.activitygroup.MyProfileActivityGroup.startChildActivity(MyProfileActivityGroup.java:69) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at com.MyPackageName.__XXXXX__.activitygroup.MyProfileActivityGroup.onCreate(MyProfileActivityGroup.java:63) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  ... 20 more 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434): Caused by: java.lang.NullPointerException 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at com.MyPackageName.__XXXXX__.activity.myprofile.DriverProfileActivity.onCreate(DriverProfileActivity.java:545) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 
06-04 00:35:27.123: ERROR/AndroidRuntime(18434):  ... 27 more 

有人嗎？

Answer 1

發現了什麼是錯誤的。

我的OnDestroy方法中有一個System.Exit（0），它在我進入後臺時處於屏幕中。

看來，如果您將應用程序發送到背景然後回來，OnDestroy將不會被調用。

但

如果在此期間發生變化的區域設置，然後再回來吧，OnDestray將被稱爲!!!!

這很奇怪，但它更多但在我的情況下，onDestroy被隱式調用（System.exit（0），但屏幕仍然存在..應用程序沒有退出（甚至更多..它您輸入正確加載的法語！），這是令人困惑的。

反正..怪異的東西解決了，謝謝。

Answer 2

沒有真正看到你的代碼，它是不可能確定問題是什麼。上面的評論給你一個開始嘗試調試問題的好地方。有一點需要注意，只要你使用String作爲關鍵字。如果在運行應用程序期間鍵被翻譯，它將無法找到值。

Answer 3

它可能是，你在外面活動的生命週期和當你切換沒有被創造了一些對象，所以你應該檢查下一個：

1. 如果這個工程W/O第4步？

2. 如果被緩存某些值/沒有翻譯正確（就像你設置一些領域，而不是每次更新）

   mField = getString(R.string.title);