Android开发之Service用法实例

package com.example.servicetest; 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
public class MainActivity extends Activity { 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    Button btnstart = (Button) findViewById(R.id.btnstart); 
    btnstart.setOnClickListener(new OnClickListener() { 
 
      @Override 
      public void onClick(View v) { 
        startService(new Intent("com.yarin.Android.MUSIC")); 
      } 
    }); 
    Button btnstop = (Button) findViewById(R.id.btnstop); 
    btnstop.setOnClickListener(new OnClickListener() { 
 
      @Override 
      public void onClick(View v) { 
        stopService(new Intent("com.yarin.Android.MUSIC")); 
      } 
    }); 
  } 
}

package com.example.servicetest; 
import android.app.Service; 
import android.content.Intent; 
import android.media.MediaPlayer; 
import android.os.IBinder; 
public class MusicService extends Service { 
  private MediaPlayer player; 
  @Override 
  public IBinder onBind(Intent intent) { 
    // TODO Auto-generated method stub 
    return null; 
  } 
  public void onStart(Intent intent, int startId) { 
    super.onStart(intent, startId); 
    player = MediaPlayer.create(this, R.raw.a); 
    player.start(); 
  } 
  public void onDestroy() { 
    super.onDestroy(); 
    player.stop(); 
  } 
}