调节屏幕亮度

源地址:http://www.itivy.com/android/archive/2011/7/3/android-adjust-screen-brightness.html

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。

 

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/**
 * 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:

 

 

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/**
 * 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?

 

 

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/**
 * 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);
    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:

 

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/**
 * 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:

 

 

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/**
 * 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!

 

 

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/**
 * 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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