Android调节屏幕亮度实现代码

这篇文章主要介绍了Android调节屏幕亮度实现代码,调节屏幕亮度时,先设置当前activity亮度,再并保存为系统亮度即可,本文分别给出两个步骤的实现代码,需要的朋友可以参考下

调节屏幕亮度时，先设置当前activity亮度，再并保存为系统亮度即可。

1 onCreate()里检查系统亮度并设置seekBar：

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 private void screenBrightness_check() {       //先关闭系统的亮度自动调节       try       {           if (android.provider.Settings.System.getInt(getContentResolver(),android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE) == android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC)           {                   android.provider.Settings.System.putInt(getContentResolver(),                     android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE,                     android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);           }       }       catch (SettingNotFoundException e)       {           // TODO Auto-generated catch block           e.printStackTrace();       }       //获取当前亮度,获取失败则返回255       intScreenBrightness=( int )(android.provider.Settings.System.getInt(getContentResolver(),                android.provider.Settings.System.SCREEN_BRIGHTNESS,                255 ));       //文本、进度条显示       mSeekBar_light.setProgress(intScreenBrightness);       mTextView_light.setText( "" +intScreenBrightness* 100 / 255 );       }

2 拖动seekBar时设置当前activity亮度，并保存为系统亮度：         

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 //屏幕亮度       private void setScreenBritness( int brightness)       {            //不让屏幕全暗            if (brightness<= 1 )            {                brightness= 1 ;            }            //设置当前activity的屏幕亮度            WindowManager.LayoutParams lp = this .getWindow().getAttributes();            //0到1,调整亮度暗到全亮            lp.screenBrightness = Float.valueOf(brightness/255f);            this .getWindow().setAttributes(lp);                  //保存为系统亮度方法1            android.provider.Settings.System.putInt(getContentResolver(),                     android.provider.Settings.System.SCREEN_BRIGHTNESS,                     brightness);                       //保存为系统亮度方法2 //        Uri uri = android.provider.Settings.System.getUriFor("screen_brightness"); //        android.provider.Settings.System.putInt(getContentResolver(), "screen_brightness", brightness);  //        // resolver.registerContentObserver(uri, true, myContentObserver); //        getContentResolver().notifyChange(uri, null);                       //更改亮度文本显示            mTextView_light.setText( "" +brightness* 100 / 255 );       }