Android Open Source - Notepad Back Button Dialog Fragment

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License

The source code is released under:

Apache License

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Java Source Code

/* Copyright 2014 Braden Farmer
 */*from  w w w .j a  v a2  s  .co m*/
 * 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;


import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;

public class BackButtonDialogFragment 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 {
    public void onBackDialogPositiveClick(String filename);
    public void onBackDialogNegativeClick(String filename);
  }

  // Use this instance of the interface to deliver action events
  Listener listener;

  // Override the Fragment.onAttach() method to instantiate the Listener
  @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");
    }
  }  

  @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, new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int id) {
        listener.onBackDialogPositiveClick(getArguments().getString("filename"));
      }
    })
    .setNegativeButton(R.string.action_discard, new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int id) {
        listener.onBackDialogNegativeClick(getArguments().getString("filename"));
      }
    });

    // Create the AlertDialog object and return it
    return builder.create();
  }
}

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