Android基础篇 使用SeekBar 变更屏幕亮度和声音音量

Posted 2021-07-23 彭老希

一、androidManifest.xml

根据所需功能自行申请权限

<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS"/>
<uses-permission android:name="android.permission.DEVICE_POWER"/>
<uses-permission android:name="android.permission.UPDATE_DEVICE_STATS"/>
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS"/>

arg1 为 SeekBar onProgressChanged 中progress

二、屏幕亮度调整

WindowManager.LayoutParams win = getWindow().getAttributes();
win.screenBrightness=(float)arg1/255;
getWindow().setAttributes(win);

三、声音调整

1)系统音量 AudioManager.STREAM_SYSTEM
2)通话音量 AudioManager.STREAM_VOICE_CALL
3)铃声音量 AudioManager.STREAM_RING
4)提示声音音量 AudioManager.STREAM_ALARM
5)多媒体音量 AudioManager.STREAM_MUSIC

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

int current;

//获取当前值
current = audio.getStreamVolume(AudioManager.STREAM_MUSIC); 

if(arg1<current){
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER,AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);
}else{
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_SHOW_UI);
}