android - Android：如何将消息从 DialogFagment 发送到 Fragment？

Question

我有一个 Fragment，从那个 Fragment 显示一个 DialogFragment，我希望 DialogFragment 向 Fragment 发送消息，或者 rech Fragment 的变量。我该怎么做？

Answer 1

You probably want to utilize a Listener pattern for this. Here's a quick example to get you started:

public class MyDialogFragment extends DialogFragment {

    public interface MyDialogFragmentListener {
        public void abstract onDialogMessage(int someValueIWantToSendToFragment);
    }

    private MyDialogFragmentListener mListener;


....

    public void setListener(MyDialogFragmentListener listener) {
        mListener = listener;
    }


}

and then whenever you need to send some bit of data to your fragment from the dialog, call mListener.onDialogMessage(someValue);

Make sure that when you create your dialogfragment, you call setListener on it with an instance of MyDialogFragmentListener.

Answer 2

您可以将此代码放在 dialogFragment 中所需的位置：

Bundle args = new Bundle();
args.putString("message",myMessage);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction ft = fragmentManager.beginTransaction();
Fragment fragment = Fragment.instantiate(getActivity(), MyFragment.class.getName(), args);
ft.replace(R.id.details, fragment);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();

例如，在onCreate对话框片段中，我们使用 bundle 发送消息：

public static class MyDialogFragment extends DialogFragment { 

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        String myMessage="Hello Fragment";
        Bundle args = new Bundle();
        args.putString("message",myMessage);
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction ft = fragmentManager.beginTransaction();
        Fragment fragment = Fragment.instantiate(getActivity(), MyFragment.class.getName(), args);
        ft.replace(R.id.details, fragment);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        ft.addToBackStack(null);
        ft.commit();
        return new AlertDialog.Builder(getActivity())
                .setIcon(R.drawable.ic_dialog_about)
                .setTitle(R.string.about)
                .setMessage(R.string.about_message)
                // ...
                .create();
    }
}

在MyFragment我可以得到我的信息，只使用这一行：

getArguments().getString("message");