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。
提供:IllegalStateException的解决方案
这个问题困扰了我很久,但幸运的是,我想出了一个具体的解决方案。这里有详细的解释。
使用commitAllowStateloss()可能会防止这种异常,但会导致UI不规范。到目前为止,我们已经了解到,当我们在Activity状态丢失后试图提交一个片段时,会遇到IllegalStateException—所以我们应该延迟事务,直到状态恢复。可以像这样简单地做
声明两个私有布尔变量
public class MainActivity extends AppCompatActivity {
//Boolean variable to mark if the transaction is safe
private boolean isTransactionSafe;
//Boolean variable to mark if there is any transaction pending
private boolean isTransactionPending;
现在在onPostResume()和onPause中,我们设置和取消设置布尔变量isTransactionSafe。想法是只有当活动在前台时才标记事务安全,这样就不会有无状态的机会。
/*
onPostResume is called only when the activity's state is completely restored. In this we will
set our boolean variable to true. Indicating that transaction is safe now
*/
public void onPostResume(){
super.onPostResume();
isTransactionSafe=true;
}
/*
onPause is called just before the activity moves to background and also before onSaveInstanceState. In this
we will mark the transaction as unsafe
*/
public void onPause(){
super.onPause();
isTransactionSafe=false;
}
private void commitFragment(){
if(isTransactionSafe) {
MyFragment myFragment = new MyFragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.frame, myFragment);
fragmentTransaction.commit();
}
}
-我们到目前为止所做的将从IllegalStateException保存,但我们的事务将丢失,如果它们在活动移动到后台后完成,有点像commitAllowStateloss()。为了解决这个问题,我们有一个isTransactionPending布尔变量
public void onPostResume(){
super.onPostResume();
isTransactionSafe=true;
/* Here after the activity is restored we check if there is any transaction pending from
the last restoration
*/
if (isTransactionPending) {
commitFragment();
}
}
private void commitFragment(){
if(isTransactionSafe) {
MyFragment myFragment = new MyFragment();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.frame, myFragment);
fragmentTransaction.commit();
isTransactionPending=false;
}else {
/*
If any transaction is not done because the activity is in background. We set the
isTransactionPending variable to true so that we can pick this up when we come back to
foreground
*/
isTransactionPending=true;
}
}