Android Open Source - Link-Schedule Bus Stop Widget Provider

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License

The source code is released under:
GNU General Public License
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Java Source Code

/**
 * Copyright 2011 Kurtis Nusbaum//from w w  w  . j  ava 2  s .  c o  m
 *
 * This file is part of LinkSchedule.  
 *
 * LinkSchedule is free software: you can 
 * redistribute it and/or modify it under the terms of the GNU General Public 
 * License as published by the Free Software Foundation, either version 2 of the 
 * License, or (at your option) any later version.  
 *
 * LinkSchedule is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
 * for more details.  You should have received a copy of the GNU  General 
 * Public License along with LinkSchedule. If not, see 
 * http://www.gnu.org/licenses/.
 */

package org.klnusbaum.linkschedule;

import android.content.Intent;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.ComponentName;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.appwidget.AppWidgetProvider;
import android.appwidget.AppWidgetManager;
import android.widget.RemoteViews;
import android.view.View;
import android.preference.PreferenceManager;
import android.util.Log;

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.lang.NullPointerException;
import java.util.Map;

/**
 * Class used for BusStopWidgets 
 *
 * @author Kurtis Nusbaum
 * @version 1.0
 */
public class BusStopWidgetProvider extends AppWidgetProvider{

  /**
   * The alarm manager responsible for controlling the alarm that updates
   * all widgets.
   */
  private static AlarmManager alarmManager;

  /**
    * The PendingIntent used to update all widgets
   */
  private static PendingIntent pendingIntent;

  /**
   * Constant used for specifying an Braodcast Intent that forces
   * all widgets to update.
    */
  public static final String ACTION_FORCE_UPDATE = "ACTION_FORCE_UPDATE";

  /**
   * Constant used for logging purposes.
   */
  public static final String LOG_TAG = "BusStopWidgetProvider";
      
  @Override
  public void onReceive(Context context, Intent intent){
    if(intent.getAction().equals(AppWidgetManager.ACTION_APPWIDGET_UPDATE)){
      return;
    }
    super.onReceive(context, intent);
    if(
      intent.getAction().equals(context.getString(R.string.widget_update_action)) ||
      intent.getAction().equals(Intent.ACTION_TIME_CHANGED) ||
      intent.getAction().equals(Intent.ACTION_TIMEZONE_CHANGED) ||
      intent.getAction().equals(ACTION_FORCE_UPDATE))
    {
      AppWidgetManager widgetManager = AppWidgetManager.getInstance(context);
      ComponentName appWidgetName = 
        new ComponentName(context, BusStopWidgetProvider.class);  
      int[] appWidgetIds = widgetManager.getAppWidgetIds(appWidgetName);
      onUpdate(context, widgetManager, appWidgetIds);
    }
  }

  @Override
  public void onEnabled(Context context){
    Intent updateIntent = 
      new Intent(context.getString(R.string.widget_update_action));
    pendingIntent = 
      PendingIntent.getBroadcast(context, 0, updateIntent, 0);
    alarmManager = 
      (AlarmManager)context.getSystemService(Context.ALARM_SERVICE); 
    GregorianCalendar nextMinute = (GregorianCalendar)Calendar.getInstance();
    nextMinute.add(Calendar.MINUTE, 1);
    nextMinute.set(Calendar.SECOND, 0);
    alarmManager.setRepeating(
      AlarmManager.RTC, 
      nextMinute.getTimeInMillis(),
      60000,
      pendingIntent);
  }

  @Override
  public void onDeleted(Context context, int[] appWidgetIds){
    SharedPreferences settings = 
      PreferenceManager.getDefaultSharedPreferences(context);
    SharedPreferences.Editor prefEditor = settings.edit();
    for(int i=0; i<appWidgetIds.length; i++){
      prefEditor.remove(String.valueOf(appWidgetIds[i]));
    }
    prefEditor.commit();
  }
      

  @Override
  public void onDisabled(Context context){
    alarmManager.cancel(pendingIntent);
  }

  @Override
  public void onUpdate(
    Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
  {
    SharedPreferences settings = 
      PreferenceManager.getDefaultSharedPreferences(context);
    boolean showTimeTill = settings.getBoolean(
      context.getString(R.string.show_timetill_widget_key), false);
    final int N = appWidgetIds.length;
    final GregorianCalendar currentTime = 
      showTimeTill ? LinkSchedule.getCalendarInstance() : null;
    for(int i=0; i<N; i++){
      int appWidgetId = appWidgetIds[i];
      String stopLabel = 
        settings.getString(String.valueOf(appWidgetId), 
        context.getString(R.string.unknown_stop));
      RemoteViews views = getWidgetView(context, stopLabel, currentTime);
      appWidgetManager.updateAppWidget(appWidgetId, views);
    }
  }
  
  /**
   * Used for createing a RemoteViews that should be displayed in a widget
   *
   * @param context The context in which the RemoteViews should be created.
   * @param stopLabel Label specifying for which stop the RemoteViews will be
   * showing times.
   * @param currentTime The current time. This is used to calculate the
   * timeTill field in the view. If this argument is null, the timeTill field
   * will be hidden.
   * @return A RemoteViews that can be used in the widgets display.
   */
  public static RemoteViews getWidgetView(
    Context context, 
    String stopLabel,
    GregorianCalendar currentTime)
  {
      if(!LinkSchedule.validBusStop(stopLabel, context)){
        Log.e(LOG_TAG, "Can't create remote view for bus stop: " + stopLabel);
        RemoteViews views = new RemoteViews(context.getPackageName(),
          R.layout.error_widget);
        views.setTextViewText(R.id.msg, 
          context.getString(R.string.contact_dev));
        return views;
      }  
      LinkSchedule linkSchedule = 
        LinkSchedule.getLinkSchedule(context.getResources());
      RemoteViews views = new RemoteViews(context.getPackageName(), 
        R.layout.bus_stop_widget);
      Map.Entry nextTime = linkSchedule.getNextTime(stopLabel);
      views.setTextViewText(R.id.time, ((String)nextTime.getValue()));
      if(currentTime != null){
        views.setViewVisibility(R.id.timeTill, View.VISIBLE);
        views.setTextViewText(
          R.id.timeTill, 
          ClockView.getTimeTillString(
            currentTime, (GregorianCalendar)nextTime.getKey()
          )
        );
      }
      else{
        views.setViewVisibility(R.id.timeTill, View.GONE);
      }
      views.setTextViewText(R.id.stopLabel, stopLabel);
      
      Intent busStopIntent = new Intent(context, SingleStopActivity.class);
      busStopIntent.putExtra(BusStopActivity.EXTRA_STOPNAME, stopLabel);
      busStopIntent.setAction("VIEW_" + stopLabel);
      PendingIntent pendingIntent = 
        PendingIntent.getActivity(context, 0, busStopIntent, 0);
      views.setOnClickPendingIntent(R.id.bus_stop_widget, pendingIntent);
      return views;
  }
}
Java Source Code List
