问题描述

不使用 OnCompletionListener() 如何动态的播放音频文件？

不使用 OnCompletionListener() 如何连续播放音频文件？
我用的下面的代码：

mp.setOnCompletionListener(new OnCompletionListener() {            @Override            public void onCompletion(MediaPlayer mp) {                // TODO Auto-generated method stub                i = i + 1;                System.out.println("""" + audio.length);                if(i < audio.length){                    img.setImageResource(image[i]);                    try {                        descriptor = getAssets().openFd(audio[i]);                        mp.reset();                        mp.setDataSource( descriptor.getFileDescriptor() descriptor.getStartOffset()descriptor.getLength());                        descriptor.close();                        mp.prepare();                        mp.start();                        xml();                    } catch (IOException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                }

这里的 xml() 方法包含图像，并从assets文件夹获取音频文件，我还需要动态的播放这些文件。如何实现？

解决方案

这个文件从你的源文件中加载一个音频文件，你应该在 activity 中调用 startService()来开启这个服务，不要忘了在 manifest 文件中添加这个服务。

public class Backgroundmusic extends Service {    // Binder given to clients    private final IBinder mBinder = new LocalBinder();    // Random number generator    private final Random mGenerator = new Random();    private SoundPool soundPool;    private HashMap<Integer Integer> soundsMap;    int SOUND1=1;    int SOUND2=2;@Overridepublic void onCreate() {    // TODO Auto-generated method stub    super.onCreate();    soundPool = new SoundPool(4 AudioManager.STREAM_MUSIC 100);    soundsMap = new HashMap<Integer Integer>();    soundsMap.put(SOUND1 soundPool.load(this R.raw.baby_laugh 1));    soundsMap.put(SOUND2 soundPool.load(this R.raw.touchdown 1));}public void playSound(int sound float fSpeed) {    AudioManager mgr = (AudioManager)getSystemService(Context.AUDIO_SERVICE);    float streamVolumeCurrent = mgr.getStreamVolume(AudioManager.STREAM_MUSIC);    float streamVolumeMax = mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC);    float volume = streamVolumeCurrent / streamVolumeMax;    soundPool.play(soundsMap.get(sound) volume volume 1 0 fSpeed);   }/** * Class used for the client Binder.  Because we know this service always * runs in the same process as its clients we don't need to deal with IPC. */public class LocalBinder extends Binder {    LocalService getService() {        // Return this instance of LocalService so clients can call public methods        return LocalService.this;    }}@Overridepublic IBinder onBind(Intent intent) {    return mBinder;}/** method for clients */public int getRandomNumber() {  return mGenerator.nextInt(100);}public void soundPlay(int index){     playSound(index 1.0f);     Log.d(""SOUND1""hi1"");}   }