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The Android Open Source Project
2009-03-03 18:28:16 -08:00
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commit d4aee0c0ca
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samples/MySampleRss/src/com/example/codelab/rssexample/MyRssReader4.java
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/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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.example.codelab.rssexample;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.graphics.Typeface;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.SimpleCursorAdapter;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
public class MyRssReader4 extends Activity {
ListView mRssList;
Cursor mCur;
RssCursorAdapter mAdap;
private static final int ADD_ELEMENT_REQUEST = 1;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
// Load screen layout.
setContentView(R.layout.main_screen2);
// Populate ArrayAdapter and bind it to ListView
mRssList = (ListView)findViewById(R.id.rssListView);
mCur = managedQuery(RssContentProvider.CONTENT_URI, // Query for all items.
null,
null,
RssContentProvider.DEFAULT_SORT_ORDER);
// BEGIN_INCLUDE(4_1)
mAdap = new RssCursorAdapter(
this,
R.layout.list_element, // Our layout resource.
mCur,
new String[]{RssContentProvider.TITLE}, // Columns to retrieve.
new int[]{R.id.list_item}); // IDs of widgets to display
mRssList.setAdapter(mAdap); // the corresponding column.
// END_INCLUDE(4_1)
// Set the last selected item.
// (icicle is only set if this is being restarted).
if(savedInstanceState != null && savedInstanceState.containsKey("lastIndexItem")){
mRssList.setSelection(savedInstanceState.getInteger("lastIndexItem"));
}
}
// Store our state before we are potentially bumped from memory.
// We'd like to store the current ListView selection.
@Override
protected void onSaveInstanceState(Bundle outState){
int index = mRssList.getSelectedItemIndex();
if(index > -1){
outState.putInteger("lastIndexItem", index);
}
}
// Add our initial menu options. We will tweak this menu when it's loaded swap out
// "start service" or "stop service", depending on whether the service is currently running.
@Override
public boolean onCreateOptionsMenu(Menu menu){
// Always call the superclass implementation to
// provide standard items.
super.onCreateOptionsMenu(menu);
menu.add(0, 0, R.string.menu_option_start, null);
menu.add(0, 1, R.string.menu_option_stop, null);
menu.add(0, 2, R.string.menu_option_add, null);
menu.add(0, 3, R.string.menu_option_delete, null);
menu.add(0, 4, R.string.menu_option_update, null);
return true;
}
// Toggle out start service/stop service depending on whether the service is running.
@Override
public boolean onPrepareOptionsMenu(Menu menu){
return true;
}
// Handle our menu clicks.
@Override
public boolean onOptionsItemSelected(Menu.Item item){
super.onOptionsItemSelected(item);
switch (item.getId()){
case 0: // Start service
showAlert(null, "You clicked 'start'!", "ok", null, false, null);
break;
case 1: // Stop service
showAlert(null, "You clicked stop!", "ok", null, false, null);
break;
case 2: // Add Item
Intent addIntent = new Intent(AddRssItem.class);
// Use an ID so that if we create a "remove item" form we
// can tell which form is returning a value.
startActivityForResult(addIntent, ADD_ELEMENT_REQUEST);
break;
case 3: // Delete item.
if(mRssList.hasFocus()){
int currentSelectionIndex = mRssList.getSelectedItemIndex();
// Create our content URI by adding the ID of the currently selected item using a
// convenience method.
Long itemID = mAdap.getItemId(currentSelectionIndex);
getContentResolver().delete(RssContentProvider.CONTENT_URI.addId(itemID), null);
}
break;
case 4: // Update all
showAlert(null, "You clicked 'Update'!", "ok", null, false, null);
break;
default:
showAlert(null, "I have no idea what you clicked!", "ok", null, false, null);
break;
}
return true;
}
// Called by the "Add RSS Item" floating screen when it closes.
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if(resultCode == RESULT_OK){
switch (requestCode){
case ADD_ELEMENT_REQUEST:
ContentValues vals = new ContentValues(4);
vals.put(RssContentProvider.TITLE, data.getStringExtra(RssContentProvider.TITLE));
vals.put(RssContentProvider.URL, data.getStringExtra(RssContentProvider.URL));
vals.put(RssContentProvider.CONTENT, data.getStringExtra(RssContentProvider.CONTENT));
vals.put(RssContentProvider.LAST_UPDATED, data.getIntExtra(RssContentProvider.LAST_UPDATED, 0));
Uri uri = getContentResolver().insert(
RssContentProvider.CONTENT_URI,
vals);
if(uri != null){
mRssList.setSelection(mRssList.getCount() - 1);
}
break;
default:
break;
}
}
}
// Our private ArrayAdapter implementation that returns a bold TextView for
// RSS items that are unread, or a normal TextView for items that have been read.
private class RssCursorAdapter extends SimpleCursorAdapter {
public RssCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to){
super(context, layout, c, from, to);
}
// Here's our only important override--returning the list item.
@Override
public View getView(int position, View convertView, ViewGroup parent){
TextView view = (TextView)super.getView(position, convertView, parent);
if(view != null){
// Now get the hasBeenRead value to determine the font.
int hasBeenReadColumnIndex = getCursor().getColumnIndex(
RssContentProvider.HAS_BEEN_READ);
boolean hasBeenRead = (getCursor().getInt(hasBeenReadColumnIndex) == 1 ? true : false);
if(! hasBeenRead){
Typeface type = view.getTypeface();
view.setTypeface(Typeface.create(type, Typeface.BOLD_ITALIC));
}
}
return view;
}
}
}