为什么KEYCODE_VOLUME_UP和KEYCODE_VOLUME_DOWN仅适用于铃声音量事件，如何在android中使用onKeyDown获取媒体（音乐）音量事件

Question

我想根据物理音量键更新我的搜索栏，但我的代码不起作用！ 请帮帮我..

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    if (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN){
        customSeekBar.setProgress(audioManager.getStreamVolume(AudioManager.STREAM_MUSIC));
        return true;
    } 
    return super.onKeyDown(keyCode, event);
}

Answer 1

 @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)){
            //Do something
            AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);
            int volume_level= am.getStreamVolume(AudioManager.STREAM_MUSIC);
            customSeekBar.setProgress(volume_level-1);
            am.adjustStreamVolume( AudioManager.STREAM_MUSIC,AudioManager.ADJUST_LOWER,0);

        }else if(keyCode == KeyEvent.KEYCODE_VOLUME_UP){
                //Do something
                AudioManager am = (AudioManager) getSystemService(AUDIO_SERVICE);
                int volume_level= am.getStreamVolume(AudioManager.STREAM_MUSIC);
            customSeekBar.setProgress(volume_level+1);
            am.adjustStreamVolume( AudioManager.STREAM_MUSIC,AudioManager.ADJUST_RAISE,0);
        }
        return true;
    }

请尝试让我知道..

Answer 2

KeyEvent.KEYCODE_VOLUME_DOWN -> {
   audioManager?.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI)
   return true
}
KeyEvent.KEYCODE_VOLUME_UP -> {
   audioManager?.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI)
   return true}