如何在安卓上播放流 aacp 运行后台

Question

我正在寻找几天如何在后台运行流 Shoutcast，其内容/类型：音频/AACP。目前，我正在使用库 aacdecoder-android 获取运行流，但不了解如何使用服务将流留在后台。有人用过这样的东西吗？

法典：

主要活动：

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);       
        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() ) {
                    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" ) {                  
                    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) {

            }
            public void onStartTrackingTouch(SeekBar arg0) {

            }
            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 Object fetch(String address) throws MalformedURLException,IOException {
        URL url = new URL(address);
        Object content = url.getContent();
        return content;
    }

    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;
        }
    }
}

无线电回调：

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!");
            }           
        }); 
    }
}

Answer 1

"使用服务" - 右：Android 服务授予您的应用程序组件额外的运行权限，即使组件不在任务堆栈顶部，甚至当您的应用程序退出时，这些权限也可以保留。大多数情况下，除了那些关键资源不足的情况，系统不会干扰和停止服务，因此由您决定如何控制它。

专门针对您的情况，官方网站上有一篇关于构建具有后台播放功能的播放器的文章。然而，他们谈论MediaPlayer，我相信相同的原则适用于任何自定义播放器。

祝你好运。

Answer 2

您必须创建一个后台服务才能使您的音乐播放器在后台运行。

首先，您必须启动该服务。然后在服务的 onCreate（） 方法中初始化您的多人游戏对象。

然后在您的 UI 活动（具有您的多人游戏 UI）上实现服务连接。这会将 UI 活动与后台服务连接起来。现在，您可以控制后台服务和多人游戏对象的功能，例如播放，暂停功能。请参阅此处以实现服务连接。

如果您希望用户通过单击通知栏中的通知来导航回 UI，也可以创建 serviceForground。

希望这有帮助