BrightUtil.java

package org.carelife.creader.util;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.net.Uri;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.view.WindowManager;

public class BrightUtil {

	
	/**
     * �ж��Ƿ����Զ���������
     * 
     * @param activity
     * @return
     */
    public static boolean isAutoBrightness(Activity activity) {
    	ContentResolver aContentResolver = activity.getContentResolver();
        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;
    }


/**
     * ȡ����Ļ����
     * 
     * @param activity
     * @return
     */
    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;
    }


/**
     * ������Ļ����
     * 
     * @param activity
     * @param brightness
     */
    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);
        android.provider.Settings.System.putInt(activity.getContentResolver(),
				android.provider.Settings.System.SCREEN_BRIGHTNESS,
				brightness);
    }



/**
     * ֹͣ�Զ�����
     * 
     * @param activity
     */
    public static void stopAutoBrightness(Activity activity) {
        Settings.System.putInt(activity.getContentResolver(),
                Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
    }



/**
     *�����Զ�����
     * 
     * @param activity
     */
    public static void startAutoBrightness(Activity activity) {
        Settings.System.putInt(activity.getContentResolver(),
                Settings.System.SCREEN_BRIGHTNESS_MODE,
                Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
    }



/**
     * ��������
     * 
     * @param activity
     * @param brightness
     */
    public static void saveBrightness(Activity activity, int brightness) {
    	ContentResolver resolver = activity.getContentResolver();
        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);
    }


	
	
}