我在开发Android应用程序时,如何检测音量是否设置为静音?
如果音量更改为静音或取消静音,我的应用程序如何收到通知?
您可以使用AudioManager来检查音量是否静音。
AudioManager audio = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
switch( audio.getRingerMode() ){
case AudioManager.RINGER_MODE_NORMAL:
break;
case AudioManager.RINGER_MODE_SILENT:
break;
case AudioManager.RINGER_MODE_VIBRATE:
break;
}
对于音量变化,有广播接收器。
public class VolumeKeyReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
//Implement Logic
}
}
注册广播接收器
VolumeKeyReceiver keyReceiver = new VolumeKeyReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("android.media.VOLUME_CHANGED_ACTION");
registerReceiver(keyReceiver, intentFilter);
您可以执行以下操作来观察特定流(在本例中为音乐)是否静音:
val Context.musicMutedFlow
get() = callbackFlow {
val receiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
when (intent.getIntExtra("android.media.EXTRA_VOLUME_STREAM_TYPE", 0)) {
AudioManager.STREAM_MUSIC -> trySend(
intent.getBooleanExtra(
"android.media.EXTRA_STREAM_VOLUME_MUTED",
false
)
)
}
}
}
registerReceiver(receiver, IntentFilter("android.media.STREAM_MUTE_CHANGED_ACTION"))
awaitClose { unregisterReceiver(receiver) }
}
然后,从
ContextWrapper
(例如,Activity
、Service
),您可以按如下方式收集流量:
lifecycleScope.launch {
musicMutedFlow.collect { Timber.d("Music stream muted: $it") }
}