本文实例讲述了Android开发实现调节屏幕亮度功能。分享给大家供大家参考，具体如下：

在很多app中进入二维码显示界面时会自动调整屏幕亮度，那么如何实现调节app的屏幕亮度呢？下面我来为大家介绍：

注:调节屏幕亮度的核心思想就是对安卓系统提供的ContentProvider进行操作

1、声明权限

需要允许用户修改系统配置

<uses-permission android:name="android.permission.CHANGE_CONFIGURATION"/><uses-permission android:name="android.permission.WRITE_SETTINGS"/>

2、具体操作

/*** 判断是否开启了自动亮度调节*/public static boolean isAutoBrightness(Context context) { ContentResolver resolver = context.getContentResolver(); boolean automicBrightness = false; try { automicBrightness = Settings.System.getInt(resolver, Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; } catch (Settings.SettingNotFoundException e) { e.printStackTrace(); } return automicBrightness;}/*** 获取屏幕的亮度*/public static int getScreenBrightness(Context context) { int nowBrightnessValue = 0; ContentResolver resolver = context.getContentResolver(); try { nowBrightnessValue = android.provider.Settings.System.getInt(resolver, Settings.System.SCREEN_BRIGHTNESS); } catch (Exception e) { e.printStackTrace(); } return nowBrightnessValue;}/*** 设置当前Activity显示时的亮度* 屏幕亮度最大数值一般为255，各款手机有所不同* screenBrightness 的取值范围在[0,1]之间*/public static void setBrightness(Activity activity, int brightness) { WindowManager.LayoutParams lp = activity.getWindow().getAttributes(); lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f); activity.getWindow().setAttributes(lp);}/*** 开启关闭自动亮度调节*/public static boolean autoBrightness(Context activity, boolean flag) { int value = 0; if (flag) { value = Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; //开启 } else { value = Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;//关闭 } return Settings.System.putInt(activity.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, value);}/*** 保存亮度设置状态，退出app也能保持设置状态*/public static void saveBrightness(Context context, int brightness) { ContentResolver resolver = context.getContentResolver(); Uri uri = android.provider.Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS); android.provider.Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, brightness); resolver.notifyChange(uri, null);}

好了，亮度调节差不多就这样了。

另外，更多关于Android权限控制的说明可点击此处查看Android权限操作说明

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android开发入门与进阶教程》、《Android视图View技巧总结》、《Android编程之activity操作技巧总结》、《Android文件操作技巧汇总》、《Android资源操作技巧汇总》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。