Android 之service: startService

原文地址：android之Service（1）startService作者：sean

运行service的方法有两种startService和bindService，区别startService的调用者和serice没有联系，及调用者结束后，service依然继续运行，而bindService组件结束后，service也结束。

该文主要讲的是使用startService启动服务。

在startService调用方法中，service的生命周期：

onCreate()->onStratCommand()->onStart()->服务->onDestroy()

说明：系统中不存在服务时，才执行oncreate方法，否则直接执行onStartCommand

 

首先创建服务程序，继承service基类

//文件名:servicejava

package jun.xiao;

 

import android.app.Service;

import android.content.Intent;

import android.media.MediaPlayer;

import android.os.IBinder;

import android.util.Log;

import android.widget.VideoView;

 

public class service extends Service {

 

@Override

public IBinder onBind(Intent arg0) {

// TODO Auto-generated method stub

return null;

}

 

@Override

public void onCreate() {

// TODO Auto-generated method stub

super.onCreate();

Log.i("Service","Oncreate");

}

 

@Override

public void onDestroy() {

// TODO Auto-generated method stub

super.onDestroy();

Log.i("Service","OnDestroy");

}

 

@Override

public void onRebind(Intent intent) {

// TODO Auto-generated method stub

super.onRebind(intent);

}

 

@Override

public void onStart(Intent intent, int startId) {

// TODO Auto-generated method stub

super.onStart(intent, startId);

Log.i("Service","OnStart");

MediaPlayer m=new MediaPlayer();

try{

m.setDataSource("/sdcard/test.mp3");

m.prepare();

m.start();

}

catch(Exception e)

{

Log.i("播放音乐", e.getMessage());

}

}

 

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

// TODO Auto-generated method stub

Log.i("Service","OnStartCommand");

return super.onStartCommand(intent, flags, startId);

}

 

@Override

public boolean onUnbind(Intent intent) {

// TODO Auto-generated method stub

return super.onUnbind(intent);

}

 

}

 

创建activity，调用startService方法

//文件名:xiaotech.java

package jun.xiao;

 

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

 

public class xiaotech extends Activity {

    

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        Button start=(Button)findViewById(R.id.button1);

        Button stop=(Button)findViewById(R.id.button2);

        start.setOnClickListener(lis);

        stop.setOnClickListener(lis);

    }

    private Button.OnClickListener lis=new Button.OnClickListener()

    {

 

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Intent intent=new Intent(xiaotech.this,service.class);

switch(v.getId())

{

case R.id.button1:

startService(intent);

Toast.makeText(xiaotech.this, "开启服务", Toast.LENGTH_SHORT).show();

break;

case R.id.button2:

stopService(intent);

Toast.makeText(xiaotech.this, "停止服务", Toast.LENGTH_SHORT).show();

break;

}

}

    

    };

}