ExampleFileObserverService.java

package com.example.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

import com.example.utility.ExampleFileObserver;

import org.alfonz.utility.Logcat;
import org.alfonz.utility.StorageUtility;

import java.io.File;
import java.util.ArrayList;
import java.util.List;


public class ExampleFileObserverService extends Service
{
	private List<ExampleFileObserver> mExampleFileObserverList;


	@Override
	public int onStartCommand(Intent intent, int flags, int startId)
	{
		// start file observers
		if(mExampleFileObserverList == null)
		{
			Logcat.d("start file observers");
			startFileObservers();
		}
		else
		{
			Logcat.d("file observers already running");
		}

		return START_STICKY;
	}


	@Override
	public IBinder onBind(Intent intent)
	{
		return null;
	}


	@Override
	public void onDestroy()
	{
		// stop file observers
		if(mExampleFileObserverList != null) stopFileObservers();
	}


	private void startFileObservers()
	{
		if(StorageUtility.isAvailable())
		{
			// create list
			mExampleFileObserverList = new ArrayList<>();

			// watch directories
			List<File> directoryList = getObservedDirectories();
			for(int i = 0; i < directoryList.size(); i++)
			{
				File directory = directoryList.get(i);

				if(directory.exists() && directory.isDirectory())
				{
					ExampleFileObserver observer = new ExampleFileObserver(directory.getAbsolutePath());
					observer.startWatching();
					mExampleFileObserverList.add(observer);
				}
			}
		}
	}


	private void stopFileObservers()
	{
		for(int i = 0; i < mExampleFileObserverList.size(); i++)
		{
			ExampleFileObserver observer = mExampleFileObserverList.get(i);
			if(observer != null)
			{
				observer.stopWatching();
				observer = null;
			}
		}
		mExampleFileObserverList = null;
	}
}