淘宝(阿里百川)手机客户端开发日记第六篇 Service详解(五)

我们现在对上一节中的DEMO进行改进，在服务中开启线程来执行。

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();

        }

    }







}