android屏幕亮度的调整

package com.sensor.demo;/** *  from http://apps.hi.baidu.com/share/detail/53623456 */import android.app.Activity;import android.content.ContentResolver;import android.net.Uri;import android.provider.Settings;import android.provider.Settings.SettingNotFoundException;import android.util.Log;import android.view.WindowManager;public class BrightnessTools {/* Android的屏幕亮度好像在2.1+的时候提供了自动调节的功能， * 所以，如果当开启自动调节功能的时候， 我们进行调节好像是没有一点作用的， * 这点让我很是无语，结果只有进行判断，看是否开启了屏幕亮度的自动调节功能。 *//** * 判断是否开启了自动亮度调节 */public static boolean isAutoBrightness(ContentResolver aContentResolver) {    boolean automicBrightness = false;    try{        automicBrightness = Settings.System.getInt(aContentResolver,                Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;    } catch(SettingNotFoundException e) {        e.printStackTrace();    }    return automicBrightness;}//然后就是要觉得当前的亮度了，这个就比较纠结了：/** * 获取屏幕的亮度 */public static int getScreenBrightness(Activity activity) {   int nowBrightnessValue = 0;    ContentResolver resolver = activity.getContentResolver();    try{        nowBrightnessValue = android.provider.Settings.System.getInt(resolver, Settings.System.SCREEN_BRIGHTNESS);    } catch(Exception e) {        e.printStackTrace();    }    return nowBrightnessValue;}//那如何修改屏幕的亮度呢？/** * 设置亮度 */public static void setBrightness(Activity activity, int brightness) {    // Settings.System.putInt(activity.getContentResolver(),    // Settings.System.SCREEN_BRIGHTNESS_MODE,    // Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);    WindowManager.LayoutParams lp = activity.getWindow().getAttributes();    lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);   Log.d("lxy", "set  lp.screenBrightness == " + lp.screenBrightness); activity.getWindow().setAttributes(lp);  }//那么，能设置了，但是为什么还是会出现，设置了，没反映呢？//嘿嘿，那是因为，开启了自动调节功能了，那如何关闭呢？这才是最重要的：/** * 停止自动亮度调节 */public static void stopAutoBrightness(Activity activity) {    Settings.System.putInt(activity.getContentResolver(),            Settings.System.SCREEN_BRIGHTNESS_MODE,            Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); }//能开启，那自然应该能关闭了哟哟，那怎么关闭呢？很简单的：/** * 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);}//至此，应该说操作亮度的差不多都有了，结束！//哎，本来认为是应该结束了，但是悲剧得是，既然像刚才那样设置的话，只能在当前的activity中有作用，一段退出的时候，会发现毫无作用，悲剧，原来是忘记了保存了。汗！/** * 保存亮度设置状态 */public static void saveBrightness(ContentResolver resolver, int brightness) {    Uri uri = android.provider.Settings.System.getUriFor("screen_brightness");    android.provider.Settings.System.putInt(resolver, "screen_brightness", brightness);    // resolver.registerContentObserver(uri, true, myContentObserver);    resolver.notifyChange(uri, null);}}
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