/*
 *  Copyright 2015 Erkan Molla
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package com.em.batterywidget;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.content.Intent;

public class BatteryWidget extends AppWidgetProvider {

    @Override
    public void onEnabled(Context context) {
        super.onEnabled(context);
        context.startService(new Intent(context, MonitorService.class));
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager widgetManager, int[] widgetIds) {
        super.onUpdate(context, widgetManager, widgetIds);
        // ensure service is running
        context.startService(new Intent(context, MonitorService.class));
    }

    @Override
    public void onDeleted(Context context, int[] widgetIds) {
        super.onDeleted(context, widgetIds);
        context.stopService(new Intent(context, MonitorService.class));
    }

}

/*
 *  Copyright 2015 Erkan Molla
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package com.em.batterywidget;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;

public class BatteryWidget extends AppWidgetProvider {

    @Override
    public void onEnabled(Context context) {
        super.onEnabled(context);
        context.startService(new Intent(context, MonitorService.class));
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager widgetManager, int[] widgetIds) {
        super.onUpdate(context, widgetManager, widgetIds);
        // ensure service is running
        context.startService(new Intent(context, MonitorService.class));
    }

    @Override
    public void onDeleted(Context context, int[] widgetIds) {
        super.onDeleted(context, widgetIds);
        // stop monitoring if there are no more widgets on screen
        ComponentName componentName = new ComponentName(context, BatteryWidget.class);
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
        int[] activeWidgetIds = appWidgetManager.getAppWidgetIds(componentName);
        if (activeWidgetIds != null && activeWidgetIds.length == 0) {
            context.stopService(new Intent(context, MonitorService.class));
        }
    }

}

Stop monitoring service only if there are no more widgets on the screen