我在市场上从我的应用程序获得用户报告,交付以下异常:
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1109)
at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:399)
at android.app.Activity.onBackPressed(Activity.java:2066)
at android.app.Activity.onKeyUp(Activity.java:2044)
at android.view.KeyEvent.dispatch(KeyEvent.java:2529)
at android.app.Activity.dispatchKeyEvent(Activity.java:2274)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1855)
at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1277)
at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.widget.TabHost.dispatchKeyEvent(TabHost.java:297)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1855)
at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1277)
at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewRoot.deliverKeyEventPostIme(ViewRoot.java:2880)
at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2853)
at android.view.ViewRoot.handleMessage(ViewRoot.java:2028)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:132)
at android.app.ActivityThread.main(ActivityThread.java:4028)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
at dalvik.system.NativeStart.main(Native Method)
显然这与FragmentManager有关,而我并不使用它。堆栈跟踪没有显示任何我自己的类,所以我不知道这个异常发生在哪里以及如何防止它。
为了记录:我有一个tabhost,在每个选项卡中都有一个在活动之间切换的ActivityGroup。
我也遇到过类似的问题,场景是这样的:
我的活动正在添加/替换列表片段。
每个列表片段都有一个对活动的引用,以便在单击列表项时通知活动(观察者模式)。
每个列表片段调用setRetainInstance(true);在其onCreate方法中。
活动的onCreate方法是这样的:
mMainFragment = (SelectionFragment) getSupportFragmentManager()
.findFragmentByTag(MAIN_FRAGMENT_TAG);
if (mMainFragment == null) {
mMainFragment = new SelectionFragment();
mMainFragment.setListAdapter(new ArrayAdapter<String>(this,
R.layout.item_main_menu, getResources().getStringArray(
R.array.main_menu)));
mMainFragment.setOnSelectionChangedListener(this);
FragmentTransaction transaction = getSupportFragmentManager()
.beginTransaction();
transaction.add(R.id.content, mMainFragment, MAIN_FRAGMENT_TAG);
transaction.commit();
}
异常被抛出是因为当配置改变时(设备旋转),活动被创建,主片段从片段管理器的历史中检索,同时片段已经有一个OLD引用到被销毁的活动
将实现改为这样就解决了问题:
mMainFragment = (SelectionFragment) getSupportFragmentManager()
.findFragmentByTag(MAIN_FRAGMENT_TAG);
if (mMainFragment == null) {
mMainFragment = new SelectionFragment();
mMainFragment.setListAdapter(new ArrayAdapter<String>(this,
R.layout.item_main_menu, getResources().getStringArray(
R.array.main_menu)));
FragmentTransaction transaction = getSupportFragmentManager()
.beginTransaction();
transaction.add(R.id.content, mMainFragment, MAIN_FRAGMENT_TAG);
transaction.commit();
}
mMainFragment.setOnSelectionChangedListener(this);
您需要在每次创建活动时设置侦听器,以避免片段引用已销毁的活动的旧实例。
如果你继承FragmentActivity,你必须调用onActivityResult()中的超类:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
...
}
如果你不这样做,并试图在该方法中显示一个片段对话框,你可能会得到OP的IllegalStateException。(说实话,我不太明白为什么超级调用可以解决这个问题。onActivityResult()在onResume()之前被调用,所以它仍然不允许显示片段对话框。
@Gian Gomen在我的案例中,SUPER解决了问题。这似乎是比commitAllowingStateLoss()更正确的解决方案,因为它解决了问题,而不是隐藏它。
@Override
public void onRequestPermissionsResult(
final int requestCode,
@NonNull final String[] permissions,
@NonNull final int[] grantResults
) {
super.onRequestPermissionsResult(requestCode,permissions, grantResults); //<--- Without this line crash
switch (requestCode) {
case Constants.REQUEST_CODE_PERMISSION_STORAGE:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
onPermissionGranted(Constants.REQUEST_CODE_PERMISSION_STORAGE);
}
break;
}
在我的情况下,我在一个叫做onActivityResult的覆盖方法中得到了这个错误。在挖掘之后,我才发现也许我之前需要打电话给“超级”。
我加进去了,效果很好
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data); //<--- THIS IS THE SUPPER CALL
if (resultCode == Activity.RESULT_OK && requestCode == 0) {
mostrarFragment(FiltroFragment.newInstance())
}
}
也许你只需要在代码之前的任何重写上添加一个“super”。
正如您在崩溃报告中看到的,引发异常的最后一行是
checkStateLoss(FragmentManager.java:1109)
如果你看checkStateLoss的实现
private void checkStateLoss() {
if (isStateSaved()) {
throw new IllegalStateException(
"Can not perform this action after onSaveInstanceState");
}
}
所以对我来说一个简单的解决方案是找到你在应用程序中调用的片段管理器的任何方法,最终导致这个方法被调用,并简单地检查是否isStateSaved()在调用该方法之前是假的。对我来说是show()方法。我是这样做的
if (!isStateSaved()) {
myDialog.show(fragmentManager, Tag)
}