package com.example.servdemo;

import android.app.Activity;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.IBinder;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener, ServiceConnection {

    private Button btnStartService, btnStopService, btnBindService, btnUnbindService, btnGetCurrentNum;

    private Intent serviceIntent;

    private EchoService echoService = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        serviceIntent = new Intent(this, EchoService.class);

        btnStartService = (Button) findViewById(R.id.btnStartService);

        btnStopService = (Button) findViewById(R.id.btnStopService);

        btnBindService = (Button) findViewById(R.id.btnBindService);

        btnUnbindService = (Button) findViewById(R.id.btnUnbindService);

        btnGetCurrentNum = (Button) findViewById(R.id.btnGetCurrentNum);

        btnStartService.setOnClickListener(this);

        btnStopService.setOnClickListener(this);

        btnBindService.setOnClickListener(this);

        btnUnbindService.setOnClickListener(this);

        btnGetCurrentNum.setOnClickListener(this);

    }

    @Override

    public void onClick(View v) {

        switch (v.getId()) {

        case R.id.btnStartService:

            startService(serviceIntent);

            break;

        case R.id.btnStopService:

            stopService(serviceIntent);

            break;

        case R.id.btnBindService:

            bindService(serviceIntent, this, Context.BIND_AUTO_CREATE);

            break;

        case R.id.btnUnbindService:

            unbindService(this);

            echoService = null;

            break;

        case R.id.btnGetCurrentNum:

            if (echoService != null) {

                System.out.println("The Number is  "+echoService.getCurrentNum());

            }

            break;

        }

    }

    @Override

    public void onServiceConnected(ComponentName name, IBinder binder) {

        System.out.println("onServiceConnected!");

        echoService = ( (EchoService.EchoServiceBinder)binder ).getService();

    }

    @Override

    public void onServiceDisconnected(ComponentName name) {

    }

}

package com.example.servdemo;

import java.util.Timer;

import java.util.TimerTask;

import android.app.Service;

import android.content.Intent;

import android.os.Binder;

import android.os.IBinder;

public class EchoService extends Service {

    @Override

    public IBinder onBind(Intent intent) {

        System.out.println("onBind!");

        return echoServiceBinder;

    }

    private final EchoServiceBinder echoServiceBinder = new EchoServiceBinder();

    public class EchoServiceBinder extends Binder{

        public EchoService getService() {

            return EchoService.this;

        }

    }

    public int getCurrentNum(){

        return i;

    }

    @Override

    public void onCreate() {

        // TODO Auto-generated method stub

        System.out.println("Service Start!");

        startTimer();

        super.onCreate();

    }

    @Override

    public void onDestroy() {

        // TODO Auto-generated method stub

        System.out.println("Service Stop!");

        stopTimer();

        super.onDestroy();

    }

    private int i = 0;

    public void startTimer(){

        if(timer == null){

            timer = new Timer();

            timerTask = new TimerTask() {

                @Override

                public void run() {

                    i++;

                    System.out.println(i);

                }

            };

            timer.schedule(timerTask, 1000, 1000);

        }

    }

    public void stopTimer(){

        if(timer != null){

            timerTask.cancel();

            timer.cancel();

            timer = null;

            timerTask = null;

        }

    }

    private Timer timer = null;

    private TimerTask timerTask = null;

}