/* Copyright 2014 Braden Farmer * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.farmerbb.notepad.fragment.dialog; import android.app.Activity; import android.app.Dialog; import android.os.Bundle; import com.farmerbb.notepad.R; import androidx.annotation.NonNull; import androidx.appcompat.app.AlertDialog; import androidx.fragment.app.DialogFragment; public class SaveButtonDialogFragment extends DialogFragment { /* The activity that creates an instance of this fragment must * implement this interface in order to receive event call backs. */ public interface Listener { void onSaveDialogPositiveClick(); void onSaveDialogNegativeClick(); } // Use this instance of the interface to deliver action events Listener listener; // Override the Fragment.onAttach() method to instantiate the Listener @SuppressWarnings("deprecation") @Override public void onAttach(Activity activity) { super.onAttach(activity); // Verify that the host activity implements the callback interface try { // Instantiate the Listener so we can send events to the host listener = (Listener) activity; } catch (ClassCastException e) { // The activity doesn't implement the interface, throw exception throw new ClassCastException(activity.toString() + " must implement Listener"); } } @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { // Use the Builder class for convenient dialog construction AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setMessage(R.string.dialog_save_changes) .setTitle(R.string.dialog_save_button_title) .setPositiveButton(R.string.action_save, (dialog, id) -> listener.onSaveDialogPositiveClick()) .setNegativeButton(R.string.action_discard, (dialog, id) -> listener.onSaveDialogNegativeClick()); // Create the AlertDialog object and return it return builder.create(); } }