Android : How to set MediaPlayer volume programmatically?

问题

How to set the mediaplayer volume programmatically. I use it for alarm notification. Any help is highly appreciated and thanks in advance.

回答1:

Using AudioManager you can control the volume of media player.

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);

also from MediaPlayer (But I didn't try that)

public void  setVolume  (float leftVolume, float rightVolume)

Since: API Level 1

Sets the volume on this player. This API is recommended for balancing the output of audio streams within an application. Unless you are writing an application to control user settings, this API should be used in preference to setStreamVolume(int, int, int) which sets the volume of ALL streams of a particular type. Note that the passed volume values are raw scalars. UI controls should be scaled logarithmically.

Parameters

leftVolume left volume scalar

rightVolume right volume scalar

回答2:

Hope this help

    audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

For Volume UP

 audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                        AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);

for Volume Down

audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                        AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);

回答3:

You do have the setVolume method in the MediaPlayer class. See here

回答4:

To Hide Volume Controll UI:

audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

For Volume UP

audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                    AudioManager.ADJUST_RAISE, 0);

for Volume Down

audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                    AudioManager.ADJUST_LOWER, 0);

回答5:

Read this page right here. It explains very well. Basically, unless your app is a replacement alarm clock, you need to make the following call in the "onCreate()" function:

setVolumeControlStream(AudioManager.STREAM_MUSIC);

In this way you can create the volume of your app using the hardware buttons.

回答6:

Remember to set left and right speaker volumes.

if (System.nanoTime() == alarm){
    yourMediaPlayer.setVolume(volume, volume)}
}

回答7:

Try This

protected static void setVolume(int volume) {
        currentVolume = volume;
        {
            if (volume == 1) {
                volume = 2;
            }
            try {
                float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);
                mediaPlayer.setVolume(vol, vol);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

回答8:

The below code sets the volume to the maximum level (getStreamMaxVolume()).

AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

回答9:

You can do the below using Kotlin, this code will check if the media volume is more than 20% of the maximum volume of the device, and will reduce it to be 20% only.

    val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager
    val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)

    val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)
    val percent = 0.2f
    val twintyVolume = (maxVolume * percent).toInt()

    if ( level > twintyVolume) {
        Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()
        audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)
    }

回答10:

Code:

AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
try 
 {        
   float count = 100 * 0.2f;
   Log.d("--count_float", count + "");
   Log.d("--count_final", Math.round(count) + "");
   Log.d("--count_volume", new 
   PreferenceMotionSensor(mContext).getStreamVolume());
   mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);
 } 
catch (Exception e) 
 {
  Log.d("--Error", e.getMessage());
 }

Output

D/--count_float: 20.0
D/--count_final: 20
D/--count_volume: 100

来源：https://stackoverflow.com/questions/8238231/android-how-to-set-mediaplayer-volume-programmatically

标签

java

android

media-player