03_Service的绑定

Start Service启动的Service，Application退出，Service也不会退出；

Bind Service启动的Service，Application退出，Service就会退出。

Start Service和Stop Service仅仅是启动服务，并不能进行通信。通过Bind Service与服务进行绑定，才能与服务通信。

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;

}