Service啟動模式

案例：

    <Button  
                   android:id="@+id/btn_start"  
               android:layout_width="match_parent"  
               android:layout_height="wrap_parent"  
               android:layout_alignParentTop="true"  
               android:layout_centerHorizontal="true"  
               android:layout_marginTop="50dp"  
               android:onClick="doStart"  
               android:text="Start Service"/>  
      
                   <Button  
                   android:layout_marginTop="20dp"  
                   android:id="@+id/btn_stop"  
               android:layout_width="match_parent"  
               android:layout_height="wrap_parent"  
               android:layout_alignParentTop="true"  
               android:layout_centerHorizontal="true"  
               android:layout_marginTop="50dp"  
               android:onClick="doStop"  
               android:text="Start Service"/>  

public void doStart(View view){
		       Intent intent = new Intent(this,SampleService.class);
		       startService(intent);
		}

		public void doStop(View view){
		   Intent intent = new Intent(this,SampleService.class);
		       stopService(intent);
		}

public class SampleService exteds Service{
             
      public void onCreate(){
      Log.d(tag,"onCreate")
         super.onCreate();
      }

     
      public int onStartCommand(Intent intent,int flags,int startId){
      Log.d(tag,"onStartCommand");
      return super.onStartCommand(intent,flags,startId);

      }

      public void onDestroy(){
      Log.d(tag,"onDestroy");
         super.onDestroy();
      }
      
      
      }

案例：

MainActivity:

package com.edu.hpu.service;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
	
	public void startMusic(View view){
		Intent intent = new Intent(this,PlayerMusicService.class);
		startService(intent);
	}

	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		Intent intent = new Intent(this,PlayerMusicService.class);
		stopService(intent);
		super.onDestroy();
	}
	
}

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
        xmlns:tools="http://schemas.android.com/tools"  
        android:layout_width="match_parent"  
        android:layout_height="match_parent"  
        >  
      
        <Button  
            android:id="@+id/button1"  
            android:layout_width="fill_parent"  
            android:layout_height="wrap_content"  
            android:layout_alignParentTop="true"  
            android:layout_centerHorizontal="true"  
            android:layout_marginTop="136dp"  
            android:onClick="startMusic"  
            android:text="播放音樂" />  
      
    </RelativeLayout>  

Service類：

package com.edu.hpu.service;

import java.io.IOException;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Environment;
import android.os.IBinder;

public class PlayerMusicService extends Service{
    private MediaPlayer player;
    
	@Override
	public void onCreate() {
             try {
				 player = new MediaPlayer();
				 player.reset();
				 player.setDataSource(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Music/Groove Coverage - She.mp3");
				 player.prepare();
				 player.start();
			} catch (IllegalArgumentException e) {
				// TODO: handle exception
				e.printStackTrace();
			}catch(SecurityException e){
				e.printStackTrace();
			}
             catch(IllegalStateException  e){
 				e.printStackTrace();
 			}
             catch(IOException  e){
  				e.printStackTrace();
  			}
	
	}
	
	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		player.release();
		player = null;
		super.onDestroy();
	}
	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

}

配置：

		   關於MediaPlayer
		      MediaPlayer支持主流的音頻、視頻文件的播放，亦支持播放
		      非本機的媒體文件；
		      MediaPlayer會開啟子線程播放歌曲；
		      可調用pause()方法暫停播放，調用seekTo()方法快進到指定的
		      位置開始播放；
	              可調用prepareAsync()方法加載歌曲，並配置OnPreparedListener,
		      在監聽器用調用MediaPlayer的start()方法；
		    通常為MediaPlayer配置OnCompletionListener,以實現在播放完成後的處理