Java tutorial
/* * Copyright (C) 2008 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.androtwitt; import java.util.ArrayList; import java.util.Iterator; import android.appwidget.AppWidgetManager; import android.appwidget.AppWidgetProvider; import android.content.ComponentName; import android.content.Context; import android.content.pm.PackageManager; import android.os.SystemClock; import android.util.Log; import android.widget.RemoteViews; import twitter4j.Status; import twitter4j.Twitter; import twitter4j.TwitterException; import twitter4j.TwitterFactory; import java.util.List; /** * A widget provider. We have a string that we pull from a preference in order to show * the configuration settings and the current time when the widget was updated. We also * register a BroadcastReceiver for time-changed and timezone-changed broadcasts, and * update then too. * * <p>See also the following files: * <ul> * <li>ExampleAppWidgetConfigure.java</li> * <li>ExampleBroadcastReceiver.java</li> * <li>res/layout/appwidget_configure.xml</li> * <li>res/layout/appwidget_provider.xml</li> * <li>res/xml/appwidget_provider.xml</li> * </ul> */ public class ExampleAppWidgetProvider extends AppWidgetProvider { // log tag private static final String TAG = "ExampleAppWidgetProvider"; public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { Log.d(TAG, "onUpdate"); // For each widget that needs an update, get the text that we should display: // - Create a RemoteViews object for it // - Set the text in the RemoteViews object // - Tell the AppWidgetManager to show that views object for the widget. final int N = appWidgetIds.length; for (int i = 0; i < N; i++) { int appWidgetId = appWidgetIds[i]; updateAppWidget(context, appWidgetManager, appWidgetId); } } public void onDeleted(Context context, int[] appWidgetIds) { Log.d(TAG, "onDeleted"); // When the user deletes the widget, delete the preference associated with it. final int N = appWidgetIds.length; for (int i = 0; i < N; i++) { ExampleAppWidgetConfigure.deleteTitlePref(context, appWidgetIds[i]); } } public void onEnabled(Context context) { Log.d(TAG, "onEnabled"); // When the first widget is created, register for the TIMEZONE_CHANGED and TIME_CHANGED // broadcasts. We don't want to be listening for these if nobody has our widget active. // This setting is sticky across reboots, but that doesn't matter, because this will // be called after boot if there is a widget instance for this provider. PackageManager pm = context.getPackageManager(); pm.setComponentEnabledSetting(new ComponentName("com.androtwitt", ".ExampleBroadcastReceiver"), PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP); } public void onDisabled(Context context) { // When the first widget is created, stop listening for the TIMEZONE_CHANGED and // TIME_CHANGED broadcasts. Log.d(TAG, "onDisabled"); Class clazz = ExampleBroadcastReceiver.class; PackageManager pm = context.getPackageManager(); pm.setComponentEnabledSetting(new ComponentName("com.androtwitt", ".ExampleBroadcastReceiver"), PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP); } static void updateAppWidget(Context context, AppWidgetManager appWidgetManager, int appWidgetId) { Log.d(TAG, "updateAppWidget appWidgetId=" + appWidgetId); ArrayList lines = new ArrayList(); Twitter unauthenticatedTwitter = new TwitterFactory().getInstance(); System.out.println("Showing public timeline."); try { List<Status> statuses = unauthenticatedTwitter.getPublicTimeline(); // Other methods require authentication String username = ExampleAppWidgetConfigure.loadTitlePref(context, appWidgetId, "username"); String password = ExampleAppWidgetConfigure.loadTitlePref(context, appWidgetId, "password"); Twitter twitter = new TwitterFactory().getInstance(username, password); statuses = twitter.getFriendsTimeline(); for (Status status : statuses) { lines.add(status.getUser().getScreenName() + ":" + status.getText()); } } catch (TwitterException te) { Log.d("AT_Error", "Failed to get timeline: " + te.getMessage()); } // Construct the RemoteViews object. It takes the package name (in our case, it's our // package, but it needs this because on the other side it's the widget host inflating // the layout from our package). RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider); ArrayList<Integer> widgetTexts = new ArrayList(); widgetTexts.add(R.id.appwidget_text0); widgetTexts.add(R.id.appwidget_text1); widgetTexts.add(R.id.appwidget_text2); widgetTexts.add(R.id.appwidget_text3); widgetTexts.add(R.id.appwidget_text4); widgetTexts.add(R.id.appwidget_text5); widgetTexts.add(R.id.appwidget_text6); widgetTexts.add(R.id.appwidget_text7); widgetTexts.add(R.id.appwidget_text8); widgetTexts.add(R.id.appwidget_text9); Iterator i = widgetTexts.iterator(); Iterator j = lines.iterator(); while (i.hasNext()) { Integer value = (Integer) i.next(); if (j.hasNext()) { views.setTextViewText(value, (String) j.next()); } } // Tell the widget manager appWidgetManager.updateAppWidget(appWidgetId, views); } }