亮度工具类

import android.content.ContentResolver;
import android.content.Context;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Build;
import android.preference.PreferenceManager;
import android.provider.Settings;

/**
 * @author L
 */
public class BrightnessManager {

    /**
     * 获得当前屏幕亮度的模式
     *
     * @return 1 为自动调节屏幕亮度,0 为手动调节屏幕亮度,-1 获取失败
     */
    public static int getScreenMode(Context context) {
        int mode = -1;
        try {
            mode = Settings.System.getInt(context.getContentResolver(),
                    Settings.System.SCREEN_BRIGHTNESS_MODE);
        } catch (Settings.SettingNotFoundException e) {
            e.printStackTrace();
        }
        return mode;
    }

    /**
     * 获得当前屏幕亮度值
     *
     * @return 0--255
     */
    public static int getScreenBrightness(Context context) {
        int screenBrightness = -1;
        try {
            screenBrightness = Settings.System.getInt(context.getContentResolver(),
                    Settings.System.SCREEN_BRIGHTNESS);
        } catch (Settings.SettingNotFoundException e) {
            e.printStackTrace();
        }
        return screenBrightness;
    }
    public static int saveBrightnessToSP(Context context) {
        int screenBrightness = -1;
        try {
            screenBrightness = Settings.System.getInt(context.getContentResolver(),
                    Settings.System.SCREEN_BRIGHTNESS);
            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
            sp.edit().putInt("system_screen_bright",screenBrightness).apply();
        } catch (Settings.SettingNotFoundException e) {
            e.printStackTrace();
        }
        return screenBrightness;
    }
    public static void restoreBrightness(Context context) {
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
        int paramInt = sp.getInt("system_screen_bright",90);
        if(Build.VERSION.SDK_INT<23){
            if (Build.VERSION.SDK_INT>=21){
                Settings.System.putInt(context.getContentResolver(),
                        Settings.System.SCREEN_BRIGHTNESS, paramInt);
                Uri uri = Settings.System.getUriFor("screen_brightness");
                context.getContentResolver().notifyChange(uri, null);
            }
/*            else {
                适配4.0
            }*/

        }
        if (Build.VERSION.SDK_INT>=23){
            if (Settings.System.canWrite(context)) {
                saveBrightness(context.getContentResolver(),paramInt);
            }
        }
    }

    /**
     * 设置当前屏幕亮度的模式
     *
     * @param mode 1 为自动调节屏幕亮度,0 为手动调节屏幕亮度
     */
    public static void setScreenMode(int mode, Context context) {
        try {

            Settings.System.putInt(context.getContentResolver(),
                    Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
            Uri uri = Settings.System.getUriFor("screen_brightness_mode");
            context.getContentResolver().notifyChange(uri, null);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 保存当前的屏幕亮度值，并使之生效
     *
     * @param paramInt 0-255
     */
    public static void setScreenBrightness(int paramInt, Context context) {
        if(Build.VERSION.SDK_INT<23){
            if (Build.VERSION.SDK_INT>=21){
                Settings.System.putInt(context.getContentResolver(),
                        Settings.System.SCREEN_BRIGHTNESS, paramInt);
                Uri uri = Settings.System.getUriFor("screen_brightness");
                context.getContentResolver().notifyChange(uri, null);
            }
/*            else {
                适配4.0
            }*/

        }
        if (Build.VERSION.SDK_INT>=23){
            if (Settings.System.canWrite(context)) {
                saveBrightness(context.getContentResolver(),paramInt);
            }
        }
    }
    public static void saveBrightness(ContentResolver resolver, int brightness) {
        //改变系统的亮度值
        //这里需要权限android.permission.WRITE_SETTINGS
        //设置为手动调节模式

        Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
        //保存到系统中
        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);
    }
}