问题
I know that there are several similar questions.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//...
getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, new LoginFragment()).commit();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Log.i(TAG, "DZActivity onSaveInstanceState");
}
@Override
public void onRequestStarted() {
DZActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
Log.i(TAG, "DZActivity onRequestStarted");
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new ProgressFragment()).commit();
}
});
}
@Override
public void onSignIn(String accessToken) {
DZActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
Log.i(TAG, "DZActivity onSignIn");
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new HomeFragment()).commit();
}
});
}
After pressing Back I start my app the second time and after pressing "Sign in" I get:
08-07 18:02:54.609: I/DZActivity(3302): DZActivity onCreate
08-07 18:02:54.659: I/DZActivity(3302): DZActivity onResume
08-07 18:03:05.349: I/DZActivity(3302): DZActivity onRequestStarted
08-07 18:03:07.929: I/DZActivity(3302): DZActivity onSignIn
08-07 18:03:19.489: I/DZActivity(3302): DZActivity onPause
08-07 18:03:19.769: I/DZActivity(3302): DZActivity onStop
08-07 18:03:19.769: I/DZActivity(3302): DZActivity onDestroy
08-07 18:03:42.799: I/DZActivity(3302): DZActivity onCreate
08-07 18:03:42.819: I/DZActivity(3302): DZActivity onResume
08-07 18:03:49.559: I/DZActivity(3302): DZActivity onRequestStarted
08-07 18:03:49.559: E/AndroidRuntime(3302): java.lang.IllegalStateException: Activity has been destroyed
08-07 18:03:49.559: E/AndroidRuntime(3302): at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1376)
08-07 18:03:49.559: E/AndroidRuntime(3302): at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
08-07 18:03:49.559: E/AndroidRuntime(3302): at android.support.v4.app.BackStackRecord.commitAllowingStateLoss(BackStackRecord.java:578)
Why do I get it if my activity was recreated and even onSaveInstanceState was not called?
回答1:
This is know issue look here
This is a bug in the nested fragments. Basically, the child FragmentManager ends up with a broken internal state when it is detached from the activity.
A short-term workaround is to add the following code in your fragment.
@Override
public void onDetach() {
super.onDetach();
try {
Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
childFragmentManager.setAccessible(true);
childFragmentManager.set(this, null);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
来源：https://stackoverflow.com/questions/25185950/java-lang-illegalstateexception-activity-has-been-destroyed