我有一个带片段的活动。片段中的一个下拉菜单决定了下方显示哪个2个片段。这两个片段继承了一个抽象片段。在这些片段中,用户通过输入域输入一些数据。我需要在屏幕旋转后恢复这些数据。如何使用
应用程序没有崩溃,但活动似乎已经完成。旋转后,屏幕会短暂冻结,然后显示父活动。
我已检查并使用项目中的最新SDK和库。
onSaveInstanceState
来做到这一点?我不想保留片段或其他任何东西。
代码:
- In the activity I don't do anything related to rotation or saving the state. I don't override
onSaveInstanceState
. In the fragment with the spinner
@Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt(SPINNER_SELECTION, selectedPosition); outState.putParcelable(FIELDS, getFragmentManager() .saveFragmentInstanceState(getFragmentManager() .findFragmentById(R.id.container_with_fields))); }
In
onCreateView
I checkif (savedInstanceState == null)
and restore the fields.- In the inner fragments I don't do anything.
错误
目前onSaveInstanceState
方法被调用,但是onCreateView
方法没被调用。在两者之间,我得到了以下错误,这似乎与我的代码无关:
07-03 10:33:06.079: W/dalvikvm(4286): threadid=1: thread exiting with uncaught exception (group=0x41e26700)
07-03 10:33:06.079: E/AndroidRuntime(4286): FATAL EXCEPTION: main
07-03 10:33:06.079: E/AndroidRuntime(4286): java.lang.NullPointerException
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1599)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1655)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.Activity.onSaveInstanceState(Activity.java:1238)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.Activity.performSaveInstanceState(Activity.java:1186)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1240)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3851)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.ActivityThread.access$800(ActivityThread.java:159)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1322)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.os.Handler.dispatchMessage(Handler.java:99)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.os.Looper.loop(Looper.java:176)
07-03 10:33:06.079: E/AndroidRuntime(4286): at android.app.ActivityThread.main(ActivityThread.java:5419)
07-03 10:33:06.079: E/AndroidRuntime(4286): at java.lang.reflect.Method.invokeNative(Native Method)
07-03 10:33:06.079: E/AndroidRuntime(4286): at java.lang.reflect.Method.invoke(Method.java:525)
07-03 10:33:06.079: E/AndroidRuntime(4286): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
07-03 10:33:06.079: E/AndroidRuntime(4286): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
07-03 10:33:06.079: E/AndroidRuntime(4286): at dalvik.system.NativeStart.main(Native Method)
应用程序没有崩溃,但活动似乎已经完成。旋转后,屏幕会短暂冻结,然后显示父活动。
我已检查并使用项目中的最新SDK和库。