wanted to know how to make the stream keep running

Hello, I wanted to know how to make the stream continue to run, even if I went to another screen, or quit the application. But I do not know how. Someone give me a hint and example. Thanks

I'm using class of type Fragmen When I left for another activity I already saw in the log this: W / MediaPlayer-JNI: MediaPlayer finalized without being released

     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.tab1aovivo, container, false);

    imgStream = (ImageView) view.findViewById(R.id.imgStreamId);
    btnTocar = (ImageView)  view.findViewById(R.id.btnExecutarId);
    btnTocar.setImageResource(R.drawable.play);
    imgStream.setVisibility(imgStream.INVISIBLE);

    mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

    progressDialog = new ProgressDialog(getActivity());

    btnTocar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(estadoInicial) {
                if(mediaPlayer.isPlaying()) {
                    mediaPlayer.pause();
                }
                estadoInicial = false;
            } else {
                if(playPause) {
                    new Player().execute(stream);
                } else {
                    if(!mediaPlayer.isPlaying()) {
                        mediaPlayer.start();
                    }
                }
                estadoInicial = true;
                playPause = false;
            }
            checkIsPlaying();
        }
    });
    checkIsPlaying();
    return view;
}

private void checkIsPlaying(){
    if(!estadoInicial) {
        btnTocar.setImageResource(R.drawable.play);
        imgStream.setImageResource(R.drawable.streaming_parado);
    } else {
        btnTocar.setImageResource(R.drawable.stop);
        Glide.with(getActivity()).load(R.drawable.streaming).asGif().into(imgStream);
    }
}

class Player extends AsyncTask<String, Void, Boolean> {
    @Override
    protected Boolean doInBackground(String... strings) {
        try {
            mediaPlayer.setDataSource(strings[0]);
            mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mediaPlayer) {
                    estadoInicial = false;
                    playPause = true;
                    btnTocar.setImageResource(R.drawable.play);
                    mediaPlayer.stop();
                    mediaPlayer.reset();
                }
            });
            mediaPlayer.prepare();
            prepared = true;

        } catch (IOException e) {
            e.printStackTrace();
            prepared = false;
        }
        return prepared;
    }

    @Override
    protected void onPostExecute(Boolean aBoolean) {
        super.onPostExecute(aBoolean);
        if(progressDialog.isShowing()) {
            progressDialog.cancel();
        }
        btnTocar.setImageResource(R.drawable.stop);
        mediaPlayer.start();
        imgStream.setVisibility(imgStream.VISIBLE);
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        Glide.with(getActivity()).load(R.drawable.carregando).asGif().into(btnTocar);
        progressDialog.setMessage("Carregando Streaming...");
        progressDialog.show();
    }
}

@Override
public void onPause() {
    super.onPause();
    Toast.makeText(getActivity(), "atc pause", Toast.LENGTH_SHORT).show();
    if(estadoInicial) {
        mediaPlayer.start();
        Toast.makeText(getActivity(), "play-pause", Toast.LENGTH_SHORT).show();
    }
}

@Override
public void onResume() {
    super.onResume();
    if(estadoInicial) {
        mediaPlayer.start();
    }
}

@Override
public void onDestroy() {
    if(prepared) {
        mediaPlayer.release();
        mediaPlayer = null;
    }
    super.onDestroy();
}