WidgetTimetable.java

package de.htwdd;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.SystemClock;
import android.util.Log;

/**
 * Implementation of App Widget functionality.
 *
 * @url http://www.helloandroid.com/tutorials/mastering-android-widget-development-part4
 */
public class WidgetTimetable extends AppWidgetProvider {

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        Log.i("Widget", "onUpdate");

        for (int appWidgetId : appWidgetIds) {
            setAlarm(context, appWidgetId, 1000 * 60);
        }
    }

    @Override
    public void onDeleted(Context context, int[] appWidgetIds) {
        for (int appWidgetId : appWidgetIds) {
            setAlarm(context, appWidgetId, -1);
        }

        super.onDeleted(context, appWidgetIds);
    }

    /**
     * Stopp Service wenn alle Instancen beendet wurden
     *
     * @param context App-Context
     */
    @Override
    public void onDisabled(Context context) {
        Log.i("Widget Timetable", "onDisable: Stoppe Service");

        // Stoppe Service
        context.stopService(new Intent(context, WidgetTimetableService.class));
    }

    public static PendingIntent makeControlPendingIntent(Context context, String command, int appWidgetId) {
        Intent active = new Intent(context, WidgetTimetableService.class);
        active.setAction(command);
        active.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
        //this Uri data is to make the PendingIntent unique, so it wont be updated by FLAG_UPDATE_CURRENT
        //so if there are multiple widget instances they wont override each other
        Uri data = Uri.withAppendedPath(Uri.parse("countdownwidget://widget/id/#" + command + appWidgetId), String.valueOf(appWidgetId));
        active.setData(data);
        return (PendingIntent.getService(context, 0, active, PendingIntent.FLAG_UPDATE_CURRENT));
    }


    /**
     * This will start and stop the updating of an AppWidget with the given appWidgetId.
     */
    public static void setAlarm(Context context, int appWidgetId, int updateRate) {
        PendingIntent newPending = makeControlPendingIntent(context, WidgetTimetableService.UPDATE, appWidgetId);

        AlarmManager alarms = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        if (updateRate >= 0)
            alarms.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(), updateRate, newPending);
        else
            // on a negative updateRate stop the refreshing
            alarms.cancel(newPending);
    }
}