大家好!
一年前,我使用“ActivityGroup + TabWidget”组合开发了一个应用,在Android OS 2.3+上运行良好。但我在OS 4.0上测试它时,发现有时会崩溃。 - 如果我打开应用程序,什么也不做,然后点击“返回”,它就可以正常工作。 - 如果我打开应用程序,在应用程序中导航(点击列表项,查看详细信息,然后返回),然后当我回到标签的“根”页面时,点击“返回”时,它就会崩溃。(它应该正常关闭应用程序)------- 在这种情况下,ActivityGroup启动新的活动并接收back键事件。 - 如果我像上面那样打开应用程序,在应用程序中导航,但只查看由组中的根活动而不是activitygroup启动的视图,那么它就可以正常工作。
我的ActivityGroup中有一些代码。
public void startActivity(Intent intent) {
// Start the root activity withing the group and get its view
View view = getLocalActivityManager().startActivity(id, intent)
.getDecorView();
// Replace the view of this ActivityGroup
replaceView(view);
}
public void back() {
if(history.size() > 1) { //history = new ArrayList<View>(); global variable
history.remove(history.size()-1);
setContentView(history.get(history.size()-1));
mIds.pop();
}else {
finish(); // I tried to commment it too, but no lucks
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
back();
return true;
}
return super.onKeyDown(keyCode, event);
}
还有错误堆栈:
05-18 18:47:47.687: E/AndroidRuntime(6828): FATAL EXCEPTION: main
05-18 18:47:47.687: E/AndroidRuntime(6828): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1213)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:442)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.app.Activity.onBackPressed(Activity.java:2121)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.app.Activity.onKeyUp(Activity.java:2099)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.KeyEvent.dispatch(KeyEvent.java:2557)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.app.Activity.dispatchKeyEvent(Activity.java:2329)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1806)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1859)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1361)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.app.Activity.dispatchKeyEvent(Activity.java:2324)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1806)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.widget.TabHost.dispatchKeyEvent(TabHost.java:298)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1248)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1859)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1361)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.app.Activity.dispatchKeyEvent(Activity.java:2324)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1806)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3300)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewRootImpl.handleFinishedEvent(ViewRootImpl.java:3273)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2436)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.os.Handler.dispatchMessage(Handler.java:99)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.os.Looper.loop(Looper.java:137)
05-18 18:47:47.687: E/AndroidRuntime(6828): at android.app.ActivityThread.main(ActivityThread.java:4340)
05-18 18:47:47.687: E/AndroidRuntime(6828): at java.lang.reflect.Method.invokeNative(Native Method)
05-18 18:47:47.687: E/AndroidRuntime(6828): at java.lang.reflect.Method.invoke(Method.java:511)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-18 18:47:47.687: E/AndroidRuntime(6828): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-18 18:47:47.687: E/AndroidRuntime(6828): at dalvik.system.NativeStart.main(Native Method)
我没有使用Fragment,因为在我开发这个应用程序时它还没有被Android SDK发布。
有什么想法吗?每一个想法都会受到赞赏!
谢谢!