android螢幕亮度的調整

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的螢幕亮度好像在2.1+的時候提供了自動調節的功能， * 所以，如果當開啟自動調節功能的時候， 我們進行調節好像是沒有一點作用的， * 這點讓我很是無語，結果只有進行判斷，看是否開啟了螢幕亮度的自動調節功能。 *//** * 判斷是否開啟了自動亮度調節 */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;}//然後就是要覺得當前的亮度了，這個就比較糾結了：/** * 擷取螢幕的亮度 */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;}//那如何修改螢幕的亮度呢？/** * 設定亮度 */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);  }//那麼，能設定了，但是為什麼還是會出現，設定了，沒反映呢？//嘿嘿，那是因為，開啟了自動調節功能了，那如何關閉呢？這才是最重要的：/** * 停止自動亮度調節 */public static void stopAutoBrightness(Activity activity) {    Settings.System.putInt(activity.getContentResolver(),            Settings.System.SCREEN_BRIGHTNESS_MODE,            Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); }//能開啟，那自然應該能關閉了喲喲，那怎麼關閉呢？很簡單的：/** * 開啟亮度自動調節 *  * @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，應該說操作亮度的差不多都有了，結束！//哎，本來認為是應該結束了，但是悲劇得是，既然像剛才那樣設定的話，只能在當前的activity中有作用，一段退出的時候，會發現毫無作用，悲劇，原來是忘記了儲存了。汗！/** * 儲存亮度設定狀態 */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);}}

/** *  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的螢幕亮度好像在2.1+的時候提供了自動調節的功能， * 所以，如果當開啟自動調節功能的時候， 我們進行調節好像是沒有一點作用的， * 這點讓我很是無語，結果只有進行判斷，看是否開啟了螢幕亮度的自動調節功能。 *//** * 判斷是否開啟了自動亮度調節 */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;}//然後就是要覺得當前的亮度了，這個就比較糾結了：/** * 擷取螢幕的亮度 */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;}//那如何修改螢幕的亮度呢？/** * 設定亮度 */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);  }//那麼，能設定了，但是為什麼還是會出現，設定了，沒反映呢？//嘿嘿，那是因為，開啟了自動調節功能了，那如何關閉呢？這才是最重要的：/** * 停止自動亮度調節 */public static void stopAutoBrightness(Activity activity) {    Settings.System.putInt(activity.getContentResolver(),            Settings.System.SCREEN_BRIGHTNESS_MODE,            Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL); }//能開啟，那自然應該能關閉了喲喲，那怎麼關閉呢？很簡單的：/** * 開啟亮度自動調節 *  * @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，應該說操作亮度的差不多都有了，結束！//哎，本來認為是應該結束了，但是悲劇得是，既然像剛才那樣設定的話，只能在當前的activity中有作用，一段退出的時候，會發現毫無作用，悲劇，原來是忘記了儲存了。汗！/** * 儲存亮度設定狀態 */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);}}