package com.example.service;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Button;

public class MyService extends Service {

    public static final String TAG = "MYSERVICE";

    private int data;

    @Override
    public void onCreate() {
        Log.i(TAG, "MyService-->onCreate");
        new Thread(new Runnable() {
            @Override
            public void run() {
                // 执行具体的任务
                getData();
            }
        }).start();
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        Log.i(TAG, "MyService-->onDestroy");
        super.onDestroy();
    }

    private MyBinder binder = new MyBinder();

    public class MyBinder extends Binder implements ICalculator
    {
         public MyService getService()
         {
             return MyService.this;
         }

        @Override
        public int getData() {

            return data;
        }

    }

    @Override
    public IBinder onBind(Intent intent) {

        return binder;
    }

     void getData()
     {
        try
        {
            //模拟耗时的任务
            Thread.sleep(10000);
            data = 100;
        }
        catch (InterruptedException e) {

            e.printStackTrace();
        }

     }

}

package com.example.service;

public interface ICalculator {
    int getData();
}

package com.example.servicedemo;

import android.app.Activity;
import android.content.ComponentName;
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;
import android.widget.Toast;

import com.example.service.ICalculator;
import com.example.service.MyService;

/*
 * bindService(intent,conn,flag)
 * Service:onCreate()
 * Service:onBind()
 * Activity:onServiceConnected()
 */
public class MainActivity extends Activity implements OnClickListener {
    private Button btnStartSrv,btnStopSrv,btnBindSrv;

    private ICalculator ical;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnStartSrv = (Button)findViewById(R.id.btnStartSrv);
        btnStopSrv = (Button)findViewById(R.id.btnStopSrv);
        btnBindSrv = (Button)findViewById(R.id.btnBindSrv);

        btnStartSrv.setOnClickListener(this);
        btnStopSrv.setOnClickListener(this);
        btnBindSrv.setOnClickListener(this);

        Intent intent=new Intent(MainActivity.this,MyService.class);
        bindService(intent, conn, BIND_AUTO_CREATE);
    }

    @Override
    protected void onDestroy() {
        unbindService(conn);
        super.onDestroy();
    }

    @Override
    public void onClick(View view) {
        Intent service = new Intent(this, MyService.class);
        switch(view.getId())
        {
            case R.id.btnStartSrv:
            {

                startService(service);
                break;
            }
            case R.id.btnStopSrv:
            {
                stopService(service);
                break;
            }
            case R.id.btnBindSrv:
            {
                testSrv();
                Toast.makeText(this, "服务调用完了", 1).show();
                break;
            }
            default:
                break;
        }
    }

    ServiceConnection conn=new ServiceConnection(){

        @Override
        public void onServiceConnected(ComponentName arg0, IBinder service) {
            ical = (ICalculator) service;
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {

        }
    };

    public void testSrv()
    {
        if(ical != null)
        {
            int x = ical.getData();
            Toast.makeText(this, String.valueOf(x), 1).show();
        }
    }

}