android调节音频

		AudioManager audioManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE);
		
		try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		
		audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_RAISE, 
				AudioManager.FLAG_SHOW_UI);
		
		try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		
		audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_LOWER, 
				AudioManager.FLAG_SHOW_UI);

adjustStreamVolume方法的

第一个参数是声音类型

第二个参数是声音调节方向,就是变大还是变小

第三个参数是是否显示声音调节动画