samples/MySampleRss/src/com/example/codelab/rssexample/MyRssReader5.java - platform/development - Git at Google

 /*
  * 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.database.Cursor;
 import android.graphics.Typeface;
 import android.net.Uri;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.View;
 import android.view.ViewGroup;
 import android.webkit.WebView;
 import android.widget.AdapterView;
 import android.widget.ListView;
 import android.widget.SimpleCursorAdapter;
 import android.widget.TextView;
 import android.widget.AdapterView.OnItemSelectedListener;

 import java.util.logging.Logger;

 public class MyRssReader5 extends Activity implements OnItemSelectedListener {

     private ListView mRssList;
     private Cursor mCur;
     private RssCursorAdapter mAdap;
     private WebView mWebView;
     private static final int ADD_ELEMENT_REQUEST = 1;
     private Logger mLogger = Logger.getLogger(this.getPackageName());

     @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);
         mRssList.setOnItemSelectedListener(this);

         mWebView = (WebView)findViewById(R.id.rssWebView);

         mCur = managedQuery(RssContentProvider.CONTENT_URI, // Query for all items.
                        null,
                        null,
                        RssContentProvider.DEFAULT_SORT_ORDER);

         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.

         // 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"));
         }
     }

 //BEGIN_INCLUDE(5_4)
     // Listener to listen for list selection changes, and send the new text to
     // the web view.
     public void onItemSelected(AdapterView parent, View v, int position, long id){
         // Need to nest this in a try block because we get called sometimes
         // with the index of a recently deleted item.
         String content = "";
         try{
             content = mCur.getString(mCur.getColumnIndex(RssContentProvider.CONTENT));
             mLogger.info("MyRssReader5 content string:" + content);
         }
         catch (Exception e){
             // This method is sometimes called after a backing data item
             // is deleted. In that case, we don't want to throw an error.
             mLogger.warning("MyRssReader5.onItemSelected() couldn't get the content" +
                             "from the cursor " + e.getMessage());
         }
         mWebView.loadData(content, "text/html", null);
     }
 //END_INCLUDE(5_4)

     public void onNothingSelected(AdapterView parent){
         mWebView.loadData("<html><body><p>No selection chosen</p></body></html>", "text/html", null);
     }

     // 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
                 Intent basicStartIntent = new Intent(RssService.class);
                 startService(basicStartIntent);
                 break;
             case 1:    // Stop service
                 Intent stopIntent = new Intent(RssService.class);
                 stopService(stopIntent);
                 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();
                     mLogger.info("MyRssReader5.onOptionsItemSelected(): Deleting list member:" +
                             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:     // Requery all
                 Bundle startupVals = new Bundle(1);
                 startupVals.putBoolean(RssService.REQUERY_KEY, true);
                 Intent requeryIntent = new Intent(RssService.class);
                 startService(requeryIntent, startupVals);
                 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(5);
                       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){
                           // Tell the service to requery the service, then set
                           // it as the active selection.
                           Bundle startupVals = new Bundle(1);
                           startupVals.putString(RssService.RSS_URL, data.getStringExtra("URL"));
                           Intent startIntent = new Intent(RssService.class);
                           startIntent.putExtras(startupVals);
                           startService(startIntent);
                           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;
         }
     }

 }
	/*
	* 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.database.Cursor;
	import android.graphics.Typeface;
	import android.net.Uri;
	import android.os.Bundle;
	import android.view.Menu;
	import android.view.View;
	import android.view.ViewGroup;
	import android.webkit.WebView;
	import android.widget.AdapterView;
	import android.widget.ListView;
	import android.widget.SimpleCursorAdapter;
	import android.widget.TextView;
	import android.widget.AdapterView.OnItemSelectedListener;

	import java.util.logging.Logger;

	public class MyRssReader5 extends Activity implements OnItemSelectedListener {

	private ListView mRssList;
	private Cursor mCur;
	private RssCursorAdapter mAdap;
	private WebView mWebView;
	private static final int ADD_ELEMENT_REQUEST = 1;
	private Logger mLogger = Logger.getLogger(this.getPackageName());

	@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);
	mRssList.setOnItemSelectedListener(this);

	mWebView = (WebView)findViewById(R.id.rssWebView);

	mCur = managedQuery(RssContentProvider.CONTENT_URI, // Query for all items.
	null,
	null,
	RssContentProvider.DEFAULT_SORT_ORDER);

	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.

	// 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"));
	}
	}

	//BEGIN_INCLUDE(5_4)
	// Listener to listen for list selection changes, and send the new text to
	// the web view.
	public void onItemSelected(AdapterView parent, View v, int position, long id){
	// Need to nest this in a try block because we get called sometimes
	// with the index of a recently deleted item.
	String content = "";
	try{
	content = mCur.getString(mCur.getColumnIndex(RssContentProvider.CONTENT));
	mLogger.info("MyRssReader5 content string:" + content);
	}
	catch (Exception e){
	// This method is sometimes called after a backing data item
	// is deleted. In that case, we don't want to throw an error.
	mLogger.warning("MyRssReader5.onItemSelected() couldn't get the content" +
	"from the cursor " + e.getMessage());
	}
	mWebView.loadData(content, "text/html", null);
	}
	//END_INCLUDE(5_4)

	public void onNothingSelected(AdapterView parent){
	mWebView.loadData("<html><body><p>No selection chosen</p></body></html>", "text/html", null);
	}

	// 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
	Intent basicStartIntent = new Intent(RssService.class);
	startService(basicStartIntent);
	break;
	case 1: // Stop service
	Intent stopIntent = new Intent(RssService.class);
	stopService(stopIntent);
	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();
	mLogger.info("MyRssReader5.onOptionsItemSelected(): Deleting list member:" +
	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: // Requery all
	Bundle startupVals = new Bundle(1);
	startupVals.putBoolean(RssService.REQUERY_KEY, true);
	Intent requeryIntent = new Intent(RssService.class);
	startService(requeryIntent, startupVals);
	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(5);
	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){
	// Tell the service to requery the service, then set
	// it as the active selection.
	Bundle startupVals = new Bundle(1);
	startupVals.putString(RssService.RSS_URL, data.getStringExtra("URL"));
	Intent startIntent = new Intent(RssService.class);
	startIntent.putExtras(startupVals);
	startService(startIntent);
	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;
	}
	}

	}