AbstractWidgetProvider.java

/*******************************************************************************
 * Copyright (c) 2011 Michel DAVID mimah35-at-gmail.com
 * 
 * This program 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 3 of the License.
 * 
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package fr.gotorennes;

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.widget.RemoteViews;
import fr.gotorennes.util.UpdateUtils;

public abstract class AbstractWidgetProvider extends AppWidgetProvider {

	private int updateCount = 0;

	public AbstractWidgetProvider() {
		super();
	}

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

		updateCount++;

		if (updateCount >= (1440 / scheduleInMinutes())) {
			UpdateUtils.checkUpdate(context);
			updateCount = 0;
		}
	}

	protected abstract RemoteViews updateRemoteViews(Context context, int appWidgetId);

	@Override
	public void onDeleted(Context context, int[] appWidgetIds) {
		for (int appWidgetId : appWidgetIds) {
			stopAlarm(context, appWidgetId);
		}
		super.onDeleted(context, appWidgetIds);
	}

	protected void stopAlarm(Context context, int widgetId) {
		Intent widgetUpdate = new Intent();
		widgetUpdate.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
		widgetUpdate.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);
		widgetUpdate.setData(Uri.withAppendedPath(Uri.parse(getScheme() + "://widget/id/"), String.valueOf(widgetId)));

		PendingIntent newPending = PendingIntent.getBroadcast(context, 0, widgetUpdate, PendingIntent.FLAG_UPDATE_CURRENT);

		AlarmManager alarms = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
		alarms.cancel(newPending);
	}

	protected void startAlarm(Context context, int widgetId) {
		Intent widgetUpdate = new Intent();
		widgetUpdate.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
		widgetUpdate.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] { widgetId });
		widgetUpdate.setData(Uri.withAppendedPath(Uri.parse(getScheme() + "://widget/id/"), String.valueOf(widgetId)));

		PendingIntent newPending = PendingIntent.getBroadcast(context, 0, widgetUpdate, PendingIntent.FLAG_UPDATE_CURRENT);

		AlarmManager alarms = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
		alarms.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(), 60 * 1000 * scheduleInMinutes(), newPending);
	}

	protected void restartAlarm(Context context, int widgetId) {
		stopAlarm(context, widgetId);
		startAlarm(context, widgetId);
	}

	@Override
	public void onReceive(Context context, Intent intent) {

		final String action = intent.getAction();

		if (AppWidgetManager.ACTION_APPWIDGET_UPDATE.equals(action)) {

			if (!getScheme().equals(intent.getScheme()) && intent.getExtras() != null) {

				final int[] appWidgetIds = intent.getExtras().getIntArray(AppWidgetManager.EXTRA_APPWIDGET_IDS);

				for (int appWidgetId : appWidgetIds) {
					restartAlarm(context, appWidgetId);
				}
			}
		}
		super.onReceive(context, intent);
	}

	protected abstract int scheduleInMinutes();

	protected abstract String getScheme();
}