1 /*
2  * Copyright (C) 2007 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 
17 package com.example.codelab.rssexample;
18 
19 import android.app.Activity;
20 import android.content.Context;
21 import android.graphics.Typeface;
22 import android.os.Bundle;
23 import android.view.Menu;
24 import android.view.View;
25 import android.view.ViewGroup;
26 import android.widget.ArrayAdapter;
27 import android.widget.ListView;
28 import android.widget.TextView;
29 
30 import java.util.ArrayList;
31 import java.util.List;
32 import java.util.logging.Logger;
33 public class MyRssReader2 extends Activity{
34     private ArrayList<RssItem> mFeeds = null;
35     ListView mRssList = null;
36     private Logger mLogger = Logger.getLogger("com.example.codelab.rssexample");
37 
38     @Override
onCreate(Bundle savedInstanceState)39     public void onCreate(Bundle savedInstanceState){
40         super.onCreate(savedInstanceState);
41 
42         // Load screen layout.
43         setContentView(R.layout.main_screen2);
44 
45        // Populate our list
46         mFeeds = initializeList();
47         mLogger.info("MyRssReader.onCreate-1  mFeeds value:" + mFeeds.size());
48 // BEGIN_INCLUDE(2_2)
49         // Populate ArrayAdapter and bind it to ListView
50         mRssList = (ListView)findViewById(R.id.rssListView);
51         if(mRssList == null){
52             // Note: Calling showAlert() would fail here because dialogs opened
53             // in onCreate won't be displayed properly, if at all.
54             mLogger.warning("MyRssReader.onCreate-2 -- Couldn't instantiate a ListView!");
55         }
56         RssDataAdapter<RssItem> adap = new RssDataAdapter<RssItem>(this, R.layout.add_item, mFeeds);
57         if(adap == null){
58             mLogger.warning("MyRssReader.onCreate-3 -- Couldn't instantiate RssDataAdapter!");
59         }
60         if(mFeeds == null){
61             mLogger.warning("MyRssReader.onCreate-4 -- Couldn't instantiate a ListView!");
62         }
63         mRssList.setAdapter(adap);
64 // END_INCLUDE(2_2)
65 
66         mLogger.info("MyRssReader.onCreate-5 -- Loading preferences.");
67         // Set the last selected item.
68         // (icicle is only set if this is being restarted).
69         if(savedInstanceState != null && savedInstanceState.containsKey("lastIndexItem"))
70         {
71             Integer selectedItem = savedInstanceState.getInteger("lastIndexItem");
72             if(selectedItem >= 0 && selectedItem < mRssList.getChildCount()){
73                 mRssList.setSelection(savedInstanceState.getInteger("lastIndexItem"));
74             }
75             mLogger.info("MyRssReader.onCreate-6 -- Last selected item:" + selectedItem);
76         }
77     }
78 
79     // Store our state before we are potentially bumped from memory.
80     // We'd like to store the current ListView selection.
81     @Override
onSaveInstanceState(Bundle outState)82     protected void onSaveInstanceState(Bundle outState){
83         int index = mRssList.getSelectedItemIndex();
84         if(index > -1){
85             outState.putInteger("lastIndexItem", index);
86         }
87     }
88 
89 
90 
91     // Add our initial menu options. We will tweak this menu when it's loaded swap out
92     // "start service" or "stop service", depending on whether the service is currently running.
93     @Override
onCreateOptionsMenu(Menu menu)94     public boolean onCreateOptionsMenu(Menu menu){
95         // Always call the superclass implementation to
96         // provide standard items.
97         super.onCreateOptionsMenu(menu);
98 
99         menu.add(0, 0, "Start RSS Service", null);
100         menu.add(0, 1, "Stop RSS Service", null);
101         menu.add(0, 2, "Add New Feed", null);
102         menu.add(0, 3, "Delete Feed", null);
103         menu.add(0, 4, "Update All Feeds", null);
104 
105         return true;
106     }
107 
108     // Toggle out start service/stop service depending on whether the service is running.
109     @Override
onPrepareOptionsMenu(Menu menu)110     public boolean onPrepareOptionsMenu(Menu menu){
111         return true;
112     }
113 
114     // Handle our menu clicks.
115     @Override
onOptionsItemSelected(Menu.Item item)116     public boolean onOptionsItemSelected(Menu.Item item){
117         switch (item.getId()){
118             case 0:
119               showAlert(null, "You clicked 'start'!", "ok", null, false, null);
120               break;
121             case 1:
122               showAlert(null, "You clicked stop!", "ok", null, false, null);
123               break;
124             case 2:
125                 showAlert(null, "You clicked 'Add'!", "ok", null, false, null);
126                 break;
127             case 3:
128                 showAlert(null, "You clicked 'Delete'!", "ok", null, false, null);
129                 break;
130             case 4:
131                 showAlert(null, "You clicked 'Update'!", "ok", null, false, null);
132                 break;
133             default:
134                 showAlert(null, "I have no idea what you clicked!", "ok", null, false, null);
135                 break;
136             }
137         return true;
138     }
139 
140 
141     // Our private ArrayAdapter implementation that returns a bold TextView for
142     // RSS items that are unread, or a normal TextView for items that have been read.
143 // BEGIN_INCLUDE(2_3)
144     private class RssDataAdapter<T> extends ArrayAdapter<T> {
RssDataAdapter(Context context, int resource, List objects)145         public RssDataAdapter(Context context, int resource, List objects) {
146             super(context, resource, objects);
147         }
148 // END_INCLUDE(2_3)
149         // Here's our only important override--returning the list item.
150         @Override
getView(int position, View convertView, ViewGroup parent)151         public View getView(int position, View convertView, ViewGroup parent){
152             TextView view = null;
153             // Get the item from the underlying array,
154             // Create a TextView wrapper, and change the typeface, if necessary.
155             RssItem item = (RssItem)this.getItem(position);
156             if(item != null)
157             {
158                 view = new TextView(parent.getContext());
159                 view.setText(item.toString());
160 
161                 if(! item.hasBeenRead){
162                     Typeface type = view.getTypeface();
163                     view.setTypeface(Typeface.create(type, Typeface.BOLD_ITALIC));
164                 }
165             }
166             return view;
167         }
168      }
169 
170 //BEGIN_INCLUDE(2_1)
171     // Method to initialize our list of RSS items.
initializeList()172     private ArrayList<RssItem> initializeList(){
173         ArrayList<RssItem> list = new ArrayList<RssItem>();
174         list.add(new RssItem("http://www.sciam.com/xml/sciam.xml", "Scientific American"));
175         list.add(new RssItem("http://newsrss.bbc.co.uk/rss/newsonline_world_edition/front_page/rss.xml", "BBC"));
176         list.add(new RssItem("http://www.theonion.com/content/feeds/daily.", "The Onion"));
177         list.add(new RssItem("http://feeds.engadget.com/weblogsinc/engadget", "Engadget"));
178         return list;
179     }
180 //END_INCLUDE(2_1)
181 }
182