TimeWidgetProvider.java

package com.rakesh.widgetalarmmanagerexample;

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.os.Bundle;
import android.widget.RemoteViews;
import android.widget.Toast;

public class TimeWidgetProvider extends AppWidgetProvider {

	@Override
	public void onDeleted(Context context, int[] appWidgetIds) {
		Toast.makeText(context, "TimeWidgetRemoved id(s):"+appWidgetIds, Toast.LENGTH_SHORT).show();
		super.onDeleted(context, appWidgetIds);
	}

	@Override
	public void onDisabled(Context context) {
		Toast.makeText(context, "onDisabled():last widget instance removed", Toast.LENGTH_SHORT).show(); 
		Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);
		PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
		AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
		alarmManager.cancel(sender);
		super.onDisabled(context);
	}

	@Override
	public void onEnabled(Context context) {
		super.onEnabled(context);
		AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
		Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);
		PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, 0);
		//After after 3 seconds
		am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+ 100 * 3, 1000 , pi);
	}

	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		ComponentName thisWidget = new ComponentName(context,
				TimeWidgetProvider.class);

		for (int widgetId : appWidgetManager.getAppWidgetIds(thisWidget)) {

			//Get the remote views
			RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
					R.layout.time_widget_layout);
			// Set the text with the current time.
			remoteViews.setTextViewText(R.id.tvTime, Utility.getCurrentTime("hh:mm:ss a"));
			appWidgetManager.updateAppWidget(widgetId, remoteViews);
		}
	}

	@Override
	public void onAppWidgetOptionsChanged(Context context,
			AppWidgetManager appWidgetManager, int appWidgetId,
			Bundle newOptions) {
		//Do some operation here, once you see that the widget has change its size or position.
		Toast.makeText(context, "onAppWidgetOptionsChanged() called", Toast.LENGTH_SHORT).show();
	}

}