设置屏幕亮度，并且监听屏幕亮度变化

公司有个需求，弹出对话框，设置当前屏幕亮度是最大亮度的90%，对话框消失，恢复到原来亮度。有一种特殊情况，就是在弹出对话框的界面打开之后，用户手动调节了亮度，需要在界面中监听亮度变化
工具类代码：

public class ScreenUtil
{/*** 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** @param activity* @return*/public static int getScreenBrightness(Activity activity) {int nowBrightnessValue = 0;ContentResolver resolver = activity.getContentResolver();try {nowBrightnessValue = Settings.System.getInt(resolver, Settings.System.SCREEN_BRIGHTNESS);} catch (Exception e) {e.printStackTrace();}return nowBrightnessValue;}/*** 设置亮度** @param activity* @param brightness*/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);}/*** 停止自动亮度调节** @param activity*/public static void stopAutoBrightness(Activity activity) {Settings.System.putInt(activity.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS_MODE,Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);}/*** 开启亮度自动调节** @param activity*/public static void startAutoBrightness(Activity activity) {Settings.System.putInt(activity.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS_MODE,Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);}/*** 保存亮度设置状态*  不保存，只能在当前的activity中有作用* @param resolver* @param brightness*/public static void saveBrightness(ContentResolver resolver, int brightness) {Uri uri = Settings.System.getUriFor("screen_brightness");Settings.System.putInt(resolver, "screen_brightness",brightness);// resolver.registerContentObserver(uri, true, myContentObserver);resolver.notifyChange(uri, null);}}

对话框中相应的代码

 private int currentBrightness=0;//获得当前屏幕亮度private boolean isAutoBrightness=false;//记录屏幕是否开启自动调节.......
//对话框显示的时候，设置亮度为最大亮度的90%setBrightness90();this.setOnDismissListener(new OnDismissListener(){@Overridepublic void onDismiss(){//对话框消失的时候，还原亮度setDefaultBrightness();}});
....../*** 设置屏幕亮度为最大亮度的90%*/private void setBrightness90(){currentBrightness = ScreenUtil.getScreenBrightness(mContext);isAutoBrightness = ScreenUtil.isAutoBrightness(mContext);if(isAutoBrightness){ScreenUtil.stopAutoBrightness(mContext);}String model = Build.MODEL;int brightness =0;if ("ALP-AL00".equals(model)){//如果是华为Mate 10 就设置最大亮度是165brightness=165;}else {//其余大部分手机最大亮度是255brightness=255;}ScreenUtil.setBrightness(mContext, (int) (brightness*0.9));}/*** 还原屏幕亮度*/private void setDefaultBrightness(){if(isAutoBrightness){ScreenUtil.startAutoBrightness(mContext);}ScreenUtil.setBrightness(mContext, currentBrightness);}public void setCurrentBrightnessAndAutoBrightness(int currentBrightness,boolean autoBrightness){this.currentBrightness = currentBrightness;isAutoBrightness = autoBrightness;}

弹出对话框的界面

 /*** 监听屏幕亮度变化*/private ContentObserver mBrightnessObserver = new ContentObserver(new Handler()) {@Overridepublic void onChange(boolean selfChange) {if(!qrCodeWindow.isShowing()){//不显示对话框，根据系统设置调节屏幕亮度ScreenUtil.setBrightness(IDCardOneCodeActivity.this,ScreenUtil.getScreenBrightness(IDCardOneCodeActivity.this));}else{//显示对话框，不根据系统调节变化亮度，先设置当前亮度和是否自动调节亮度配置，等对话框消失以后，设置亮度为调整后的亮度qrCodeWindow.setCurrentBrightnessAndAutoBrightness(ScreenUtil.getScreenBrightness(IDCardOneCodeActivity.this),ScreenUtil.isAutoBrightness(IDCardOneCodeActivity.this));}}};@Overrideprotected void onResume(){super.onResume();getContentResolver().registerContentObserver(Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS), true,mBrightnessObserver);}@Overrideprotected void onDestroy(){super.onDestroy();getContentResolver().unregisterContentObserver(mBrightnessObserver);}

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