我最近在我的程序中收到了崩溃。使用 logCat，我确定崩溃是由于onRestoreInstanceState()我的应用程序恢复时主要活动中的代码造成的。日志文件：
07-23 16:27:01.927 I/ActivityManager( 390): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.myapp/.MainActivity bnds=[1184,809][1376,1001]} from pid 30666
07-23 16:27:01.997 I/ActivityManager( 390): Start proc com.myapp for activity com.myapp/.MainActivity: pid=31007 uid=10070 gids={50070, 1028}
07-23 16:27:02.137 E/AndroidRuntime(31007): FATAL EXCEPTION: main
07-23 16:27:02.137 E/AndroidRuntime(31007): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp/com.myapp.MainActivity}: java.lang.ClassCastException: android.os.Parcelable[] cannot be cast to com.myapp.Panel[]
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.app.ActivityThread.access$600(ActivityThread.java:141)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.os.Handler.dispatchMessage(Handler.java:99)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.os.Looper.loop(Looper.java:137)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-23 16:27:02.137 E/AndroidRuntime(31007): at java.lang.reflect.Method.invokeNative(Native Method)
07-23 16:27:02.137 E/AndroidRuntime(31007): at java.lang.reflect.Method.invoke(Method.java:511)
07-23 16:27:02.137 E/AndroidRuntime(31007): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-23 16:27:02.137 E/AndroidRuntime(31007): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-23 16:27:02.137 E/AndroidRuntime(31007): at dalvik.system.NativeStart.main(Native Method)
07-23 16:27:02.137 E/AndroidRuntime(31007): Caused by: java.lang.ClassCastException: android.os.Parcelable[] cannot be cast to com.myapp.Panel[]
07-23 16:27:02.137 E/AndroidRuntime(31007): at com.myapp.MainActivity.onRestoreInstanceState(MainActivity.java:177)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.app.Activity.performRestoreInstanceState(Activity.java:910)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1131)
07-23 16:27:02.137 E/AndroidRuntime(31007): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2158)
07-23 16:27:02.137 E/AndroidRuntime(31007): ... 11 more
07-23 16:27:02.167 W/ActivityManager( 390): Force finishing activity com.myapp/.MainActivity
崩溃发生在mPanels = (Panel[]) inState.getParcelableArray("panelParcel");下面的 onRestoreInstanceState 方法中。
这种方法对我来说一直有效，直到这次崩溃，我试图弄清楚为什么 inState 似乎没有我保存在其中的对象数组（面板）。我很困惑，因为 inState 似乎不包括我保存到其中的 panelParcel。
我从这个问题中看到我通常应该使用onCreate而不是onRestoreInstanceState，但我很想了解为什么这在极少数情况下不起作用，也许我不完全了解活动生命周期的某些内容？
保存和恢复实例状态的代码：
@Override
public void onSaveInstanceState(@NotNull Bundle outState)
{
Log.d("panelCreation", "onSaveInstanceState Called");
super.onSaveInstanceState(outState);
// save the current panel state
outState.putParcelableArray("panelParcel", mPanels);
}
@Override
public void onRestoreInstanceState(Bundle inState)
{
Log.d("panelCreation", "onsState Called");
super.onRestoreInstanceState(inState);
// Note getParcelable returns a *new* array, so we must setup the drawer listener after this
mPanels = (Panel[]) inState.getParcelableArray("panelParcel");
// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new PanelArrayAdapter(this,
R.layout.drawer_list_item, mPanels));
refreshDrawerListChecked();
// Forces the Adapter to redraw the view to ensure color stylings are applied
((PanelArrayAdapter)mDrawerList.getAdapter()).notifyDataSetChanged();
}