学步园

package android.lekko.tools;

import android.app.Activity;
import android.content.ContentResolver;
import android.provider.Settings;
import android.provider.Settings.System;
import android.view.WindowManager;
import android.widget.Toast;

public class LightnessControl {
    // 判断是否开启了自动亮度调节 
    public static boolean isAutoBrightness(Activity act) { 
        boolean automicBrightness = false; 
        ContentResolver aContentResolver = act.getContentResolver();
        try { 
            automicBrightness = Settings.System.getInt(aContentResolver, 
                   Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; 
        } catch (Exception e) { 
            Toast.makeText(act,"无法获取亮度",Toast.LENGTH_SHORT).show();
        } 
        return automicBrightness; 
    }     
    // 改变亮度
    public static void SetLightness(Activity act,int value)
    {        
        try {
            System.putInt(act.getContentResolver(),System.SCREEN_BRIGHTNESS,value); 
            WindowManager.LayoutParams lp = act.getWindow().getAttributes(); 
            lp.screenBrightness = (value<=0?1:value) / 255f;
            act.getWindow().setAttributes(lp);
        } catch (Exception e) {
            Toast.makeText(act,"无法改变亮度",Toast.LENGTH_SHORT).show();
        }        
    }
    // 获取亮度
    public static int GetLightness(Activity act)
    {
        return System.getInt(act.getContentResolver(),System.SCREEN_BRIGHTNESS,-1);
    }
    // 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); 
    }
    // 开启亮度自动调节 
    public static void startAutoBrightness(Activity activity) { 
        Settings.System.putInt(activity.getContentResolver(), 
                Settings.System.SCREEN_BRIGHTNESS_MODE, 
                Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC); 
    } 
}