Initial Contribution
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The Android Open Source Project
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/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.codelab.rssexample;
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import android.app.Activity;
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import android.content.Context;
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import android.content.Intent;
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import android.graphics.Typeface;
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import android.os.Bundle;
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import android.view.Menu;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ArrayAdapter;
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import android.widget.ListView;
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import android.widget.TextView;
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import java.util.ArrayList;
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import java.util.List;
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public class MyRssReader3 extends Activity{
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private ArrayList<RssItem> mFeeds;
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ListView mRssList;
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ArrayAdapter mAdap;
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private static final int ADD_ELEMENT_REQUEST = 1;
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@Override
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public void onCreate(Bundle savedInstanceState){
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super.onCreate(savedInstanceState);
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// Load screen layout.
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setContentView(R.layout.main_screen2);
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// Populate our list
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mFeeds = initializeList();
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// Populate ArrayAdapter and bind it to ListView
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mRssList = (ListView)findViewById(R.id.rssListView);
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mAdap = new RssDataAdapter<RssItem>(this, R.layout.list_element, mFeeds);
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mRssList.setAdapter(mAdap);
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// Set the last selected item.
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// (icicle is only set if this is being restarted).
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if(savedInstanceState != null && savedInstanceState.containsKey("lastIndexItem"))
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mRssList.setSelection(savedInstanceState.getInteger("lastIndexItem"));
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}
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// Store our state before we are potentially bumped from memory.
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// We'd like to store the current ListView selection.
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@Override
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protected void onSaveInstanceState(Bundle outState){
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int index = mRssList.getSelectedItemIndex();
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if(index > -1){
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outState.putInteger("lastIndexItem", index);
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}
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}
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// Add our initial menu options. We will tweak this menu when it's loaded swap out
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// "start service" or "stop service", depending on whether the service is currently running.
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@Override
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public boolean onCreateOptionsMenu(Menu menu)
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{
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// Always call the superclass implementation to
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// provide standard items.
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super.onCreateOptionsMenu(menu);
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menu.add(0, 0, R.string.menu_option_start, null);
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menu.add(0, 1, R.string.menu_option_stop, null);
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menu.add(0, 2, R.string.menu_option_add, null);
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menu.add(0, 3, R.string.menu_option_delete, null);
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menu.add(0, 4, R.string.menu_option_update, null);
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return true;
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}
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// Toggle out start service/stop service depending on whether the service is running.
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@Override
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public boolean onPrepareOptionsMenu(Menu menu){
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return true;
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}
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// Handle our menu clicks.
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@Override
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public boolean onOptionsItemSelected(Menu.Item item){
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super.onOptionsItemSelected(item);
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switch (item.getId()){
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case 0: // Start service
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showAlert(null, "You clicked 'start'!", "ok", null, false, null);
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break;
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case 1: // Stop service
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showAlert(null, "You clicked stop!", "ok", null, false, null);
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break;
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case 2: // Add Item
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Intent addIntent = new Intent(AddRssItem.class);
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// Use an ID so that if we create a "remove item" form we
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// can tell which form is returning a value.
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startActivityForResult(addIntent, ADD_ELEMENT_REQUEST);
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break;
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case 3: // Delete item.
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if(mRssList.hasFocus()){
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Object selectedItem = mRssList.getSelectedItem();
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mAdap.removeObject(mRssList.getSelectedItem());
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}
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break;
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case 4: // Update all
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showAlert(null, "You clicked 'Update'!", "ok", null, false, null);
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break;
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default:
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showAlert(null, "I have no idea what you clicked!", "ok", null, false, null);
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break;
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}
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return true;
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}
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// Called by the "Add RSS Item" floating screen when it closes.
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@Override
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protected void onActivityResult(int requestCode, int resultCode, Intent data){
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if(resultCode == RESULT_OK){
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switch (requestCode){
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case ADD_ELEMENT_REQUEST:
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RssItem newIt = new RssItem(
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data.getStringExtra("url").toString(),
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data.getStringExtra("title").toString());
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mAdap.addObject(newIt);
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mRssList.setSelection(mRssList.getCount() - 1);
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break;
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default:
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break;
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}
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}
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}
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// Our private ArrayAdapter implementation that returns a bold TextView for
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// RSS items that are unread, or a normal TextView for items that have been read.
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private class RssDataAdapter<T> extends ArrayAdapter<T> {
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public RssDataAdapter(Context context, int resource, List objects) {
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super(context, resource, objects);
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}
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// Here's our only important override--returning the list item.
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@Override
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public View getView(int position, View convertView, ViewGroup parent){
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// Get the item from the underlying array,
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// Create a TextView wrapper, and change the typeface, if necessary.
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RssItem item = (RssItem)this.getItem(position);
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TextView view = new TextView(parent.getContext());
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view.setText(item.toString());
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if(! item.hasBeenRead){
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Typeface type = view.getTypeface();
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view.setTypeface(Typeface.create(type, Typeface.BOLD_ITALIC));
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}
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return view;
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}
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}
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// Method to initialize our list of RSS items.
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private ArrayList<RssItem> initializeList(){
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ArrayList<RssItem> list = new ArrayList<RssItem>();
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list.add(new RssItem("http://www.sciam.com/xml/sciam.xml", "Scientific American"));
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list.add(new RssItem("http://newsrss.bbc.co.uk/rss/newsonline_world_edition/front_page/rss.xml", "BBC"));
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list.add(new RssItem("http://feeds.theonion.com/theonion/daily", "The Onion"));
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list.add(new RssItem("http://feeds.engadget.com/weblogsinc/engadget", "Engadget"));
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return list;
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}
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}
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