onActivityResult中的操作和“错误无法在onSaveInstanceState之后执行此操作”
实现用户可以login的应用程序我有以下情况：如果用户login执行操作，否则请启动结果的login活动，如果结果是Activity.RESULT_OK，请执行操作。
我的问题是，perfom的动作是显示一个DialogFragment，但调用
DialogFragment newFragment = MyDialogFragment.newInstance(mStackLevel); newFragment.show(ft, "dialog") 在onActivityResultcallback中抛出一个exception：
Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
那我该如何解决呢？ 我正在考虑在那里举起一面旗帜，并在onResume中显示对话框，但我看到这个解决scheme有点肮脏
编辑：添加更多的代码（我按照这个例子显示DialogFragment
当用户请求动作时：
... if (!user.isLogged()){ startActivityForResult(new Intent(cnt, Login.class), REQUEST_LOGIN_FOR_COMMENT); }
在同一个片段
@Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == REQUEST_LOGIN_FOR_COMMENT && resultCode == Activity.RESULT_OK) { FragmentTransaction ft = getFragmentManager().beginTransaction(); DialogFragment newFragment = MyDialogFragment.newInstance(); newFragment.show(ft, "dialog") } }
如果用户loginlogin活动调用;
setResult(Activity.RESULT_OK); finish();
我提出的最好的事情是不使用.show（），而是做到这一点。
CheckinSuccessDialog dialog = new CheckinSuccessDialog(); //dialog.show(getSupportFragmentManager(), null); FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); ft.add(dialog, null); ft.commitAllowingStateLoss();
这是对我来说工作正常的解决方法。
private void alert(final String message) { Handler handler = new Handler(Looper.getMainLooper()); handler.post(new Runnable() { public void run() { AlertDialogFragment alertDialogFragment = AlertDialogFragment.newInstance(message); alertDialogFragment.show(getFragmentManager(), ALERT_DIALOG_FRAGMENT); } }); }
如果使用DialogFragment，唯一能解决的就是用dissmissAllowingStateLoss（）
我只是检查一个活动是否被破坏。
if (!getActivity().isFinishing()) { DialogFragment fragment = MyFragment.newInstance(); fragment.show(getActivity().getSupportFragmentManager(), MyFragment.TAG); }
重写show(Fragment manager, String tag)function，允许状态丢失并改变mDismissed = false; mShownByMe = true; 从原始function反思：
public class DialogParent extends DialogFragment { @Override public void show(FragmentManager manager, String tag) { try { Field mDismissed = DialogFragment.class.getDeclaredField("mDismissed"); Field mShownByMe = DialogFragment.class.getDeclaredField("mShownByMe"); mDismissed.setAccessible(true); mShownByMe.setAccessible(true); mDismissed.setBoolean(this, false); mShownByMe.setBoolean(this, true); } catch (NoSuchFieldException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } FragmentTransaction ft = manager.beginTransaction(); ft.add(this, tag); ft.commitAllowingStateLoss(); } }
这真实的作品。
CheckinSuccessDialog dialog = new CheckinSuccessDialog(); //dialog.show(getSupportFragmentManager(), null); FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); ft.add(dialog, null); ft.commitAllowingStateLoss();
但是，但仍然不好，因为得到错误“活动已被破坏”
ava.lang.IllegalStateException: Activity has been destroyed fragmentTransaction.commitAllowingStateLoss();
所以我的解决scheme是添加检查， if (!isFinishing()&&!isDestroyed())
CheckinSuccessDialog fragment = CheckinSuccessDialog.newInstance(); if (fragment instanceof DialogFragment) { DialogFragment dialog = (DialogFragment) fragment; if (!dialog.isAdded()) { fragmentTransaction.add(dialog, CheckinSuccessDialog.class.getName()); if (!isFinishing()&&!isDestroyed()) { fragmentTransaction.commitAllowingStateLoss(); } }
closures：
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); Fragment fragment = getSupportFragmentManager().findFragmentByTag(CheckinSuccessDialog.class.getName()); if (fragment != null && fragment instanceof DialogFragment) { DialogFragment dialog = (DialogFragment) fragment; dialog.dismiss(); if (!isFinishing()&&!isDestroyed()) { fragmentTransaction.commitAllowingStateLoss(); } }
