Question

我正在尝试开发一个Android应用程序，即使应用程序最小化，也会在任何应用程序开始播放音频时显示弹出窗口。

到目前为止，我尝试使用带有onAudioFocusChange侦听器的服务，但从不调用侦听器。以下是我到目前为止的情况：

public class MyService extends Service {

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

        Log.i("AUDIO", "SERVICE STARTED"); //CALLED

        AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);
        AudioManager.OnAudioFocusChangeListener listener = new  AudioManager.OnAudioFocusChangeListener(){
            @Override
            public void onAudioFocusChange(int i) {
                Log.i("AUDIO", "FOCUS CHANGED"); //NOT CALLED
            }
        };

        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }
}

我是在正确的轨道上吗？

编辑：尝试按照建议注册听众，但仍然无法正常工作。即使是在主要活动中。

public class MainActivity extends AppCompatActivity {
    @Override


  protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.test);

        Button btnPlay1 = (Button) findViewById(R.id.btn_play_1);

        btnPlay1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mediaPlayer.start();
            }
        });

        AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);

        AudioManager.OnAudioFocusChangeListener listener = new  AudioManager.OnAudioFocusChangeListener(){
            @Override
            public void onAudioFocusChange(int i) {
                Log.i("AUDIO", "FOCUS CHANGED"); //NOT CALLED
            }
        };

        am.requestAudioFocus(listener, AudioManager.STREAM_MUSIC,
                AudioManager.AUDIOFOCUS_GAIN );
    }

}

Answer 1

您刚刚在代码中声明了侦听器，但未注册它。你需要注册

am.requestAudioFocus(listener, AudioManager.STREAM_MUSIC,
                AudioManager.AUDIOFOCUS_GAIN );

检查this

检测音频何时开始在其他应用中播放

1 个答案: