android - 显示 DialogFragments 会使 ICS 崩溃

Question

Fragments API 发布后，我开始使用兼容包将所有已弃用的对话框移植到 DialogFraments 中。一切都运行良好，直到我注意到我的对话框仅导致 ICS 崩溃:

E/AndroidRuntime(  883): FATAL EXCEPTION: main
E/AndroidRuntime(  883): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
E/AndroidRuntime(  883):    at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1254)
E/AndroidRuntime(  883):    at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1265)
E/AndroidRuntime(  883):    at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:541)
E/AndroidRuntime(  883):    at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:525)
E/AndroidRuntime(  883):    at android.support.v4.app.DialogFragment.show(DialogFragment.java:123)
E/AndroidRuntime(  883):    at com.myapp.ui.dialogs.TwoButtonDialogFragment.showDialog(TwoButtonDialogFragment.java:84)

我的对话框显示在 AsyncTask.onPostExecute() 上，以便向用户显示 http 响应。深入研究问题后得出的结论是，这个异常只有在Activity暂停或停止时才会发生，其他版本的Android不会发生。我试过使用 commitAllowingStateLoss()，但它没有帮助，因为在 DialogFragment.show() 上抛出了异常。这是我的 DialogFragment 代码:

private static void showDialog(FragmentActivity activity, String title, String msg, 
        String positiveButtonText, String negativeButtonText, int id, Bundle args) {

    if (activity.isFinishing()) {
        return;
    }

    FragmentManager fmgr = activity.getSupportFragmentManager();
    FragmentTransaction ft = fmgr.beginTransaction();
    Fragment prev = fmgr.findFragmentByTag(TAG);
    if (prev != null) {
        try {
            ft.remove(prev);
        } catch (IllegalStateException ex) {
            // issue: http://code.google.com/p/android/issues/detail?id=17029
        }
    }

    TwoButtonDialogFragment newFragment = new TwoButtonDialogFragment();
    if (args == null) {
        args = new Bundle();
    }
    args.putString("title", title);
    args.putString("message", msg);
    args.putString("positiveButtonText", positiveButtonText);
    args.putString("negativeButtonText", negativeButtonText);
    args.putInt("id", id);
    newFragment.setArguments(args);
    newFragment.setCancelable(false);
    newFragment.show(fmgr, TAG); // exception is thrown here
    ft.commit();
}


@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    final Bundle args = getArguments();
    String title = args.getString("title");
    String msg = args.getString("message");
    String positiveButtonText = args.getString("positiveButtonText");
    String negativeButtonText = args.getString("negativeButtonText");
    final int id = args.getInt("id");

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    if (!TextUtils.isEmpty(title)) {
        builder.setTitle(title);
    }
    builder.setMessage(msg);

    final TwoButtonDialogHandler handler = (TwoButtonDialogHandler) getActivity();
    builder.setPositiveButton(positiveButtonText, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {              
            handler.doPositiveClick(id, args);
        }
    });
    builder.setNegativeButton(negativeButtonText, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            handler.doNegativeClick(id, args);
        }
    });

    return builder.create();
}

这是 ICS 上的错误吗？我该怎么办？

Answer 1

我遇到了这个问题，但在框架中找不到解决这个问题的方法。

但是我确实提供了解决该问题的方法，您可以在下面的 link 中看到该问题