Waldemar/src/de/schatenseite/android/waldemar/WaldemarWidget.java

package de.schatenseite.android.waldemar;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.widget.RemoteViews;
import android.widget.Toast;
import de.schatenseite.android.datepreference.DatePreference;

public class WaldemarWidget extends AppWidgetProvider {
	public static String MIDNIGHTLY_WIDGET_UPDATE = "MIDNIGHTLY_WIDGET_UPDATE";
	static AlarmManager myAlarmManager;
	static PendingIntent myPendingIntent;
	
	@Override
	public void onEnabled(Context context) {
		Intent intent = new Intent(
				WaldemarWidget.MIDNIGHTLY_WIDGET_UPDATE);
		PendingIntent pendingIntent = PendingIntent.getBroadcast(
				context, 0, intent, 0);
		AlarmManager alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
		Calendar calendar = new GregorianCalendar();
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);

		alarmManager.setRepeating(AlarmManager.RTC,
				calendar.getTimeInMillis(), AlarmManager.INTERVAL_FIFTEEN_MINUTES, pendingIntent);
		
		WaldemarWidget.SaveAlarmManager(alarmManager, pendingIntent);
		Toast.makeText(context, "onEnabled()", Toast.LENGTH_LONG).show();
	}

	@Override
	public void onDisabled(Context context) {
		myAlarmManager.cancel(myPendingIntent);
		Toast.makeText(context, "onDisabled()", Toast.LENGTH_LONG).show();
	}

	@Override
	public void onReceive(Context context, Intent intent) {
		if (MIDNIGHTLY_WIDGET_UPDATE.equals(intent.getAction()) || "PreferencesUpdated".equals(intent.getAction())) {
			Bundle extras = intent.getExtras();
			if (extras != null) {
				AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
				ComponentName thisAppWidget = new ComponentName(
						context.getPackageName(),
						WaldemarWidget.class.getName());
				int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisAppWidget);

				onUpdate(context, appWidgetManager, appWidgetIds);
			}
		} else {
			super.onReceive(context, intent);
		}
	}

	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		for (int appWidgetId : appWidgetIds) {
			updateAppWidget(context, appWidgetManager, appWidgetId);
		}
	}

	public static void updateAppWidget(Context context,
			AppWidgetManager appWidgetManager, int appWidgetId) {
		RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.main);

		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
		remoteViews.setTextViewText(R.id.name, prefs.getString("pref_name", context.getString(R.string.title)));

		Calendar calNow = new GregorianCalendar();
		calNow.set(Calendar.HOUR_OF_DAY, 0);
		calNow.set(Calendar.MINUTE, 0);
		calNow.set(Calendar.SECOND, 0);
		long timeNow = calNow.getTimeInMillis();
		
		Calendar calThen = DatePreference.getDateFor(PreferenceManager.getDefaultSharedPreferences(context), "pref_dateThen"); 
	    long timeThen = calThen.getTimeInMillis();

		long days = Math.round((double) (timeThen - timeNow) / 86400000.);
		remoteViews.setTextViewText(R.id.daycount, String.valueOf(days));

		DateFormat format = SimpleDateFormat.getTimeInstance(
				SimpleDateFormat.MEDIUM, Locale.getDefault());
		remoteViews.setTextViewText(R.id.debug, format.format(new Date()));

		appWidgetManager.updateAppWidget(appWidgetId, remoteViews);
	}

	static void SaveAlarmManager(AlarmManager tAlarmManager,
			PendingIntent tPendingIntent) {
		myAlarmManager = tAlarmManager;
		myPendingIntent = tPendingIntent;
	}
}