在后台淡出MediaPlayer可以通过以下步骤实现:
以下是一个示例代码,展示了如何在后台淡出MediaPlayer:
public class MyService extends Service {
private MediaPlayer mediaPlayer;
private AudioManager audioManager;
private BroadcastReceiver audioFocusReceiver;
@Override
public void onCreate() {
super.onCreate();
mediaPlayer = new MediaPlayer();
audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioFocusReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (AudioManager.ACTION_AUDIO_BECOMING_NOISY.equals(intent.getAction())) {
// 处理音频焦点丢失的情况
fadeOutMediaPlayer();
}
}
};
registerReceiver(audioFocusReceiver, new IntentFilter(AudioManager.ACTION_AUDIO_BECOMING_NOISY));
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// 在这里开始播放音乐
mediaPlayer.start();
return START_STICKY;
}
private void fadeOutMediaPlayer() {
final int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
int currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
// 逐渐降低音量
while (currentVolume > 0) {
float volume = (float) currentVolume / maxVolume;
mediaPlayer.setVolume(volume, volume);
currentVolume--;
try {
Thread.sleep(100); // 控制音量变化的速度
} catch (InterruptedException e) {
e.printStackTrace();
}
}
// 停止播放并释放资源
mediaPlayer.stop();
mediaPlayer.release();
}
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(audioFocusReceiver);
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
请注意,以上代码仅为示例,实际应用中可能需要根据具体情况进行适当修改和优化。
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