Java tutorial
/*** Copyright (c) 2017 CommonsWare, LLC 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. Covered in detail in the book _The Busy Coder's Guide to Android Development_ https://commonsware.com/Android */ package com.commonsware.android.service.ouroboros; import android.app.Notification; import android.app.NotificationManager; import android.app.Service; import android.content.Context; import android.content.Intent; import android.os.IBinder; import android.support.v4.app.NotificationCompat; import android.util.Log; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; abstract public class AbstractSillyService extends Service { abstract protected Class<? extends AbstractSillyService> getOtherClass(); static final String EXTRA_FOREGROUND = "foreground"; static final String EXTRA_BROADCAST_HACK = "hack"; private final ScheduledExecutorService timer = Executors.newScheduledThreadPool(1); @Override public int onStartCommand(final Intent intent, int flags, int startId) { Log.e(getClass().getSimpleName(), "onStartCommand() called"); timer.schedule(new Runnable() { @Override public void run() { Intent next = new Intent(AbstractSillyService.this, getOtherClass()); if (intent.getBooleanExtra(EXTRA_FOREGROUND, false)) { Log.e(getClass().getSimpleName(), "starting foreground"); next.putExtra(EXTRA_FOREGROUND, true); getSystemService(NotificationManager.class).startServiceInForeground(next, 1337, buildNotification(AbstractSillyService.this)); } else if (intent.getBooleanExtra(EXTRA_BROADCAST_HACK, false)) { Log.e(getClass().getSimpleName(), "starting via broadcast hack"); next.putExtra(EXTRA_BROADCAST_HACK, true); sendBroadcast(new Intent(AbstractSillyService.this, HackReceiver.class) .putExtra(Intent.EXTRA_INTENT, next)); } else { Log.e(getClass().getSimpleName(), "starting normal"); startService(next); } } }, 1, TimeUnit.MINUTES); return (START_STICKY); } @Override public IBinder onBind(Intent intent) { throw new IllegalStateException("Do. Not. Want."); } @Override public void onDestroy() { Log.e(getClass().getSimpleName(), "onDestroy() called"); super.onDestroy(); } static Notification buildNotification(Context ctxt) { NotificationCompat.Builder b = new NotificationCompat.Builder(ctxt).setOngoing(true) .setContentTitle(ctxt.getString(R.string.msg_notify_title)) .setContentText(ctxt.getString(R.string.msg_notify_text)) .setSmallIcon(android.R.drawable.stat_notify_more); return (b.build()); } }