1 /*
2  * Copyright (C) 2012 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package com.example.android.fragments;
17 
18 import android.app.Activity;
19 import android.os.Bundle;
20 import android.support.v4.app.ListFragment;
21 import android.view.View;
22 import android.widget.ArrayAdapter;
23 import android.widget.ListView;
24 
25 public class HeadlinesFragment extends ListFragment {
26     OnHeadlineSelectedListener mCallback;
27 
28     // The container Activity must implement this interface so the frag can deliver messages
29     public interface OnHeadlineSelectedListener {
30         /** Called by HeadlinesFragment when a list item is selected */
onArticleSelected(int position)31         public void onArticleSelected(int position);
32     }
33 
34     @Override
onCreate(Bundle savedInstanceState)35     public void onCreate(Bundle savedInstanceState) {
36         super.onCreate(savedInstanceState);
37 
38         // We need to use a different list item layout for devices older than Honeycomb
39         int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
40                 android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;
41 
42         // Create an array adapter for the list view, using the Ipsum headlines array
43         setListAdapter(new ArrayAdapter<String>(getActivity(), layout, Ipsum.Headlines));
44     }
45 
46     @Override
onStart()47     public void onStart() {
48         super.onStart();
49 
50         // When in two-pane layout, set the listview to highlight the selected list item
51         // (We do this during onStart because at the point the listview is available.)
52         if (getFragmentManager().findFragmentById(R.id.article_fragment) != null) {
53             getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
54         }
55     }
56 
57     @Override
onAttach(Activity activity)58     public void onAttach(Activity activity) {
59         super.onAttach(activity);
60 
61         // This makes sure that the container activity has implemented
62         // the callback interface. If not, it throws an exception.
63         try {
64             mCallback = (OnHeadlineSelectedListener) activity;
65         } catch (ClassCastException e) {
66             throw new ClassCastException(activity.toString()
67                     + " must implement OnHeadlineSelectedListener");
68         }
69     }
70 
71     @Override
onListItemClick(ListView l, View v, int position, long id)72     public void onListItemClick(ListView l, View v, int position, long id) {
73         // Notify the parent activity of selected item
74         mCallback.onArticleSelected(position);
75 
76         // Set the item as checked to be highlighted when in two-pane layout
77         getListView().setItemChecked(position, true);
78     }
79 }