Question

我正在尝试使用服务播放音频并更新适配器中的搜索栏项目。但我无法从服务中获得音频的持续时间。此外，在滚动recyclerview时，会更新多个项目视图，而不是更新当前正在播放的搜索栏项目。我试过下面的代码。

public class LocalService extends Service {

boolean mBound = false;

private final IBinder mBinder = new LocalBinder();
private String path = "";
private int timer;

private static MediaPlayer mediaPlayer = new MediaPlayer();
// Random number generator

/**
 * 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 {

    public LocalService getService() {
        // Return this instance of LocalService so clients can call public methods

        return LocalService.this;
    }
}

@Override
public IBinder onBind(Intent intent) {

    return mBinder;
}

/**
 * method for clients
 */
public int getTotalTime() {

    return mediaPlayer.getDuration();
}

public int getDuration() {
    // Log.v("player duration",timer+"");
    try {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            Log.v("playing", (mediaPlayer.getCurrentPosition() / 1000) + "");
            return mediaPlayer.getCurrentPosition() / 1000;
        } else {
            //Log.v("not playing", (mediaPlayer.getCurrentPosition() / 1000) + "");
            return 0;
        }
    }catch (IllegalStateException i)
    {
        i.printStackTrace();
        return 0;
    }
    catch (Exception e)
    {
        e.printStackTrace();
        return 0;
    }

}

@Override
public void onCreate() {
    super.onCreate();

    try {
        mediaPlayer = new MediaPlayer();
    } catch (Exception e) {
        e.printStackTrace();
    }

}

public void setAudio(String path)
{
    try {

            mediaPlayer.setDataSource(path);



    } catch (IOException e) {
        e.printStackTrace();

    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

}

public void playAudio() {
    Log.v("audio path", path);

    try {

        mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                mediaPlayer.prepareAsync();
                mediaPlayer.start();
                timer=mediaPlayer.getDuration();

                Log.v("total timer1",timer+"");

            }
        });


        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                timer=0;
                mediaPlayer.stop();
                mediaPlayer.reset();
                //mediaPlayer.release();
            }
        });



    } catch (Exception e) {

        e.printStackTrace();
    }
}



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

    return START_STICKY;
}

@Override
public void unbindService(ServiceConnection conn) {
    super.unbindService(conn);

    mediaPlayer.reset();
    mediaPlayer.release();
}


@Override
public void onDestroy() {
    super.onDestroy();
    mediaPlayer.reset();
    mediaPlayer.release();

}

服务从适配器构造函数启动。

 Intent intent = new Intent(mContext, LocalService.class);
    mContext.bindService(intent, mConnection, Context.BIND_AUTO_CREATE);

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    vhItemHolder.playPauseImageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                currentlyPlayingPosition = position;

                if (mBound) {

                    Log.v("service","bound");

                    //Make sure you update Seekbar on UI thread
                    mService.setAudio(audioDirectory+messageArrayList.get(position).getmMediaValue());

                    mPlayer=new MediaPlayer();
                    try {
                        mPlayer.setDataSource(audioDirectory+messageArrayList.get(position).getmMediaValue());
                        mPlayer.prepareAsync();
                        vhItemHolder.seekBar.setMax(mPlayer.getDuration());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    mService.playAudio();

                    Log.v("duration",(mService.getTotalTime())+"");

                    vhItemHolder.seekBar.setMax(mService.getTotalTime());

                    mHandler.removeCallbacks(null);

                    mHandler=new Handler();

                    ((DoctorActivity)mContext).runOnUiThread(new Runnable() {

                        @Override
                        public void run() {

                            num = mService.getDuration();
                            Log.v("progress",num+"");
                            vhItemHolder.seekBar.setProgress((num));
                            vhItemHolder.runningTimerTextView.setText(convertMilliToMinutes((long)mService.getDuration()));

                            mHandler.postDelayed(this, 50);
                        }
                    });
                }
                else
                {
                    Log.v("service","not bound");
                }

Answer 1

在适配器类中：您正在viewHolder的playPauseImageView的onClickListener中创建MediaPlayer（mPlayer）的新对象，并在其上调用setDataSource（）方法，该方法将此本地mPlayer对象的数据源设置为LocalService类的mediaPlayer对象。

调用mService.playAudio（）和mService.getDuration（）方法访问尚未调用setDataSource（）方法的LocalService类'mediaPlayer对象，因此必须返回错误的持续时间且无法播放。

您应该在适配器类中进行更改，如下所示：

vhItemHolder.playPauseImageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            currentlyPlayingPosition = position;

            if (mBound) {

                Log.v("service","bound");

                //Make sure you update Seekbar on UI thread
                mService.setAudio(audioDirectory+messageArrayList.get(position).getmMediaValue());

                mPlayer = mService.mediaPlayer;// or mPlayer = LocalService.mediaPlayer; as being static object.
    //rather new MediaPlayer();
                try {
                    mPlayer.setDataSource(audioDirectory+messageArrayList.get(position).getmMediaValue());
                    mPlayer.prepareAsync();
                    vhItemHolder.seekBar.setMax(mPlayer.getDuration());
                } catch (IOException e) {
                    e.printStackTrace();
                }

                mService.playAudio();

                Log.v("duration",(mService.getTotalTime())+"");

                vhItemHolder.seekBar.setMax(mService.getTotalTime());

                mHandler.removeCallbacks(null);

                mHandler=new Handler();

                ((DoctorActivity)mContext).runOnUiThread(new Runnable() {

                    @Override
                    public void run() {

                        num = mService.getDuration();
                        Log.v("progress",num+"");
                        vhItemHolder.seekBar.setProgress((num));
                        vhItemHolder.runningTimerTextView.setText(convertMilliToMinutes((long)mService.getDuration()));

                        mHandler.postDelayed(this, 50);
                    }
                });
            }
            else
            {
                Log.v("service","not bound");
            }

如何从服务获取音频的持续时间并在适配器中设置为seekbar项目？

1 个答案: