Stream radio em segundo plano

Ainda não consegui deixar a música rolando em segundo plano.
Vou tentar explicar como estou fazendo para ver se alguém consegue me ajuda.

O aplicativo que eu peguei está usando aacdecoder-android para ler uma url responsável pelo stream da rádio. Porém quando eu tento eu saio da aplicação e vou utilizar outro app ele para de tocar.

Já pesquisei em vários fóruns pela internet, mas todos só explicam como usar o Service com arquivos e MP3 e eu desejo mesmo é usar com uma URL.
Por favor, alguém me ajuda.

Vou postar os códigos para ajudar.

MainActivity:

public class MainActivity extends Activity {
    public AACPlayer mp;
    private Toast myToast;
    private Handler mHandler;
    private ImageParser mImageParser;
    
    private WebView publicidadecapa;
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add("Sair");
        return super.onCreateOptionsMenu(menu);
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getTitle().toString() == "Sair") {
            finish();
        }
        return super.onOptionsItemSelected(item);
    }
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.maintab);       
        mHandler = new Handler();
      //  mHandler.postDelayed(this,1000);
        
        mp = new AACPlayer(new RadioCallBack(this));                
        ProgressBar loading = (ProgressBar) findViewById(R.id.loadingAudio);
        loading.setVisibility(View.INVISIBLE);
        ImageView playButton = (ImageView) findViewById(R.id.playButton);
        playButton.setTag("1");
        playButton.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                ImageView playButton = (ImageView) arg0;
                    ConnectivityManager cm =
                        (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
                
                if ( cm.getActiveNetworkInfo() == null || !cm.getActiveNetworkInfo().isConnectedOrConnecting() ) {
                    if (myToast == null) {
                        myToast = Toast.makeText(getBaseContext(), "Verifique a conexão com a internet", 5000);
                    }
                    myToast.setDuration(5000);
                    myToast.show();
                    return;
                }
                    
                if (playButton.getTag() == "1" && cm.getActiveNetworkInfo().isConnectedOrConnecting() ) {
//                  mp.prepareAsync();                          
                    playButton.setImageResource(R.drawable.btn_menustop);
                    playButton.setTag("0");
                    playButton.setVisibility(View.INVISIBLE);
                    ProgressBar loading = (ProgressBar) findViewById(R.id.loadingAudio);
                    loading.setVisibility(View.VISIBLE);
                    ((TextView)findViewById(R.id.textView1)).setText("Conectando...");
                    
                 
                     mp.playAsync( "http://voxsc1.somafm.com:9002/" );
                   
                } else if ( playButton.getTag() == "0" ) {                  
//                  mp.stop();  
//                  mp.release();   
//                  mp = null;                  
                    playButton.setVisibility(View.INVISIBLE);
                    ProgressBar loading = (ProgressBar) findViewById(R.id.loadingAudio);
                    loading.setVisibility(View.VISIBLE);
                    playButton.setImageResource(R.drawable.btn_menuplay);
                    playButton.setTag("1");

                    mp.stop();
                }                                               
                
            }           
        });        
        
        final AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);        
        
        SeekBar volumeControl = (SeekBar) findViewById(R.id.volumeControl);
        volumeControl.setMax(audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
        volumeControl.setProgress(audioManager.getStreamVolume(AudioManager.STREAM_MUSIC));
        volumeControl.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            
            public void onStopTrackingTouch(SeekBar arg0) {
                // TODO Auto-generated method stub
                
            }
            
            public void onStartTrackingTouch(SeekBar arg0) {
                // TODO Auto-generated method stub
                
            }
            
            public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {
                audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, arg1,0);
                if(arg1 == 0) {
                    ((ImageView) findViewById(R.id.imageView2)).setImageResource(R.drawable.ic_volume2);
                } else {
                    ((ImageView) findViewById(R.id.imageView2)).setImageResource(R.drawable.ic_volume1);
                }
            }
        });        
    }
       
    @Override
    public void onStop() {
        super.onStop();
        
    }
    @Override
    protected void onDestroy() {
        if (this.isFinishing()) {
            //mp.stop();
        }
        super.onDestroy();
    }
    
    public void onStart()
    {
       super.onStart();
     
       // your code
    }

/*  public void run() {
        mHandler.postDelayed(this, 15000);
    }*/
    
    private Drawable ImageOperations(Context ctx, String url, String saveFilename) {
        try {
            InputStream is = (InputStream) this.fetch(url);
            Drawable d = Drawable.createFromStream(is, "src");
            return d;
        } catch (MalformedURLException e) {
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    public Object fetch(String address) throws MalformedURLException,IOException {
        URL url = new URL(address);
        Object content = url.getContent();
        return content;
    }
    
    //Verifica se está conectado
    private Boolean isOnline()  {
        ConnectivityManager cm = 
          (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo ni = cm.getActiveNetworkInfo();
        if(ni != null && ni.isConnected())
            return true;

        return false;
    }
    
    /* Abrir em uma nova aba o link da publicidade */
    public class MyWebClient extends WebViewClient{
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            //Uri uri = Uri.parse(url);
            Context context = view.getContext();
            Intent intent = new Intent(context,OpenSiteWebView.class);
            
            Bundle parametros = new Bundle();
            parametros.putString("url", url);
            
            intent.putExtras(parametros);
            
            startActivity(intent);
            return true;
        }
    }


}

RadioCallBack:

public class RadioCallBack implements PlayerCallback {

    private MainActivity activity;
    
    public RadioCallBack(MainActivity activity) {
        super();
        this.activity = activity;
    }

    public void playerException(Throwable arg0) {
        activity.runOnUiThread(new Runnable()  {                    
            public void run() {
                Toast.makeText(activity, "O stream pode estar offline! Tente novamente mais tarde", 50000).show();
                
                ProgressBar loading = (ProgressBar) activity.findViewById(R.id.loadingAudio);
                loading.setVisibility(View.INVISIBLE);
                ImageView playButton = (ImageView) activity.findViewById(R.id.playButton);
                playButton.setVisibility(View.VISIBLE);
                playButton.setImageResource(R.drawable.btn_menuplay);
                playButton.setTag("1");
                ((TextView)activity.findViewById(R.id.textView1)).setText("Pressione PLAY para tocar!");
            }
        });
    }

    public void playerPCMFeedBuffer(boolean arg0, int arg1, int arg2) {
        // TODO Auto-generated method stub

    }

    public void playerStarted() {
        activity.runOnUiThread(new Runnable()  {            
            public void run() {
                ProgressBar loading = (ProgressBar) activity.findViewById(R.id.loadingAudio);
                loading.setVisibility(View.INVISIBLE);
                ImageView playButton = (ImageView) activity.findViewById(R.id.playButton);
                playButton.setVisibility(View.VISIBLE);
                ((TextView)activity.findViewById(R.id.textView1)).setText("Mais música brasileira");
            }           
        });     
    }

    public void playerStopped(int arg0) {
        activity.runOnUiThread(new Runnable()  {            
            public void run() {
                activity.mp = null;
                activity.mp = new AACPlayer(new RadioCallBack(activity));
                ProgressBar loading = (ProgressBar) activity.findViewById(R.id.loadingAudio);
                loading.setVisibility(View.INVISIBLE);
                ImageView playButton = (ImageView) activity.findViewById(R.id.playButton);
                playButton.setVisibility(View.VISIBLE);
                ((TextView)activity.findViewById(R.id.textView1)).setText("Pressione PLAY para tocar!");
            }           
        }); 
    }   

}