android - DialogFragment 在屏幕旋转时消失

Question

尽管我将 RetainInstance 设置为 true，但这个相当简单的对话框在屏幕旋转后自行消失。任何想法怎么了？

public class StreetDialog extends DialogFragment {

    public static StreetDialog newInstance(String[] values) {
        StreetDialog f = new StreetDialog();
        Bundle args = new Bundle();
        args.putStringArray("values", values);
        f.setArguments(args);
        return f;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRetainInstance(true);
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        final String[] values = getArguments().getStringArray("values");

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        //build my dialog
        return builder.create();
    }

    @Override
    public void onDestroyView() {
        if (getDialog() != null && getRetainInstance())
            getDialog().setDismissMessage(null);

        super.onDestroyView();
    }
}

Answer 1

如果我没记错的话是正常行为。我一般是给show方法提供一个tag，当Activity的onCreate再次被调用的时候，再去寻找这个tag。如果 fragment != null 我将其删除，然后再创建和显示新 fragment 。在代码中，我通常做的是:

Fragment fragment = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG);
if (fragment != null) {
  getSupportFragmentManager().beginTransaction().remove(fragment).commit();
}
new CustomDialogFragment().show(getSupportFragmentManager(), FRAGMENT_TAG );