Android允许我们使用Service组件来完成后台任务，这些任务的允许不会影响到用户其他的交互。
1、Activity类
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package demo.camera;
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import android.app.Activity;
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import android.content.ComponentName;
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import android.content.Context;
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import android.content.Intent;
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import android.content.ServiceConnection;
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import android.os.Bundle;
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import android.os.IBinder;
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import android.view.View;
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public class BackgroundAudioDemo extends Activity {
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private AudioService audioService;
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private ServiceConnection conn = new ServiceConnection() {
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@Override
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public void onServiceDisconnected(ComponentName name) {
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audioService = null;
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}
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@Override
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public void onServiceConnected(ComponentName name, IBinder binder) {
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audioService = ((AudioService.AudioBinder)binder).getService();
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}
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};
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public void onCreate(Bundle savedInstanceState){
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super.onCreate(savedInstanceState);
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setContentView(R.layout.back_audio);
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}
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public void onClick(View v){
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int id = v.getId();
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Intent intent = new Intent();
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intent.setClass(this, AudioService.class);
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if(id == R.id.btn_start){
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startService(intent);
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bindService(intent, conn, Context.BIND_AUTO_CREATE);
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finish();
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}else if(id == R.id.btn_end){
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unbindService(conn);
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stopService(intent);
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finish();
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}else if(id == R.id.btn_fun){
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audioService.haveFun();
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}
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}
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}
2、Service类
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package demo.camera;
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import android.app.Service;
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import android.content.Intent;
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import android.media.MediaPlayer;
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import android.os.Binder;
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import android.os.IBinder;
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import android.widget.MediaController.MediaPlayerControl;
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public class AudioService extends Service implements MediaPlayer.OnCompletionListener{
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MediaPlayer player;
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private final IBinder binder = new AudioBinder();
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@Override
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public IBinder onBind(Intent arg0) {
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return binder;
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}
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@Override
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public void onCompletion(MediaPlayer player) {
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stopSelf();
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}
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public void onCreate(){
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super.onCreate();
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player = MediaPlayer.create(this, R.raw.tt);
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player.setOnCompletionListener(this);
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}
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public int onStartCommand(Intent intent, int flags, int startId){
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if(!player.isPlaying()){
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player.start();
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}
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return START_STICKY;
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}
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public void onDestroy(){
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if(player.isPlaying()){
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player.stop();
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}
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player.release();
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}
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class AudioBinder extends Binder{
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AudioService getService(){
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return AudioService.this;
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}
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}
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public void haveFun(){
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if(player.isPlaying() && player.getCurrentPosition()>2500){
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player.seekTo(player.getCurrentPosition()-2500);
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}
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}
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}
3、在清单文件AndroidManifest.xml中配置Service
<service
android:name=".AudioService" />
Android多媒体学习六：利用Service实现背景音乐的播放
原文：http://blog.csdn.net/u011730649/article/details/44304929
