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;}