MediaPlayerWrapper class

public class MediaPlayerWrapper
{
    private static final String LOG_TAG = "MediaPlayerWrapper";
    private String mFilename;
    PlayerState mState = PlayerState.Stopped;
    MediaPlayer mPlayerEngine;
    int mStartTime;
    int mStopTime;
    int mVolume;
    Handler mHandler = new Handler();


    Runnable mStopPlayerTask = new Runnable(){
        @Override
        public void run() {
            stop(PlayStopReason.Finished);
        }};


    public MediaPlayerWrapper(Context context)
    {
    }


    public void play(AudioClip clip)
             throws IllegalStateException, IllegalArgumentException, SecurityException, IOException
    {
        Log.v(LOG_TAG, "play()");
        mPlayerEngine = new MediaPlayer();
        setAudioClip(clip);
        mPlayerEngine.start();
        mState = PlayerState.Playing;
        mHandler.postDelayed(mStopPlayerTask, clip.getStopTime()-clip.getStartTime());
    }


    public void stop(PlayStopReason reason)
    {
        Log.v(LOG_TAG, "stop()");
        if (PlayerState.Paused == mState || PlayerState.Playing == mState)
        {
            Log.d(LOG_TAG, "Stopping player...");
            mHandler.removeCallbacks(mStopPlayerTask);
            mPlayerEngine.stop();
            mState = PlayerState.Stopped;
        }
    }


    private void setAudioClip(AudioClip clip)
            throws IllegalStateException, IllegalArgumentException, SecurityException, IOException
    {
        Log.v(LOG_TAG, "setAudioClip()");
        mFilename = clip.getSource();
        if (null == mFilename || mFilename.equals(""))
        {
            String text = "The given audio file name is empty!";
            Log.e(LOG_TAG, text);
            throw new IllegalStateException(text);
        }
        File f = new File(mFilename);
        if (!f.exists())
        {
            String text = "The specified file [" + mFilename + "] does not exist!";
            Log.e(LOG_TAG, "text");
            throw new FileNotFoundException(text);
        }
        try
        {
            mPlayerEngine.setDataSource(mFilename);
            mPlayerEngine.prepare();
        }catch(Exception ex)
        {
            Log.e(LOG_TAG, "An error happened preparing media player: " + ex.getMessage());
            ex.printStackTrace();
        }
        mStartTime = clip.getStartTime();
        mStopTime = clip.getStopTime();
        setPosition(mStartTime);
    }


    public void pause()
    {
        if (PlayerState.Playing == mState)
        {
            mPlayerEngine.pause();
            mHandler.removeCallbacks(mStopPlayerTask);
            mState = PlayerState.Paused;
        }
    }


    public void resume()
    {
        if (PlayerState.Paused == mState)
        {
            mHandler.postDelayed(mStopPlayerTask, mStopTime-mPlayerEngine.getCurrentPosition());
            mPlayerEngine.start();
            mState = PlayerState.Playing;
        }
    }


    private void setPosition(int pos)
    {
        Log.v(LOG_TAG, "setPosition()");
        mPlayerEngine.seekTo(pos);
    }


    @Override
    public void playRequested(AudioClip clip)
    {
        try
        {
            play(clip);
        } catch (Exception e)
        {
            //TODO: Inform user that the book is corrupted.
            e.printStackTrace();
        }
    }
}