import android.app.Activity;import android.content.ContentResolver;import android.provider.Settings;import android.provider.Settings.SettingNotFoundException;import android.view.WindowManager;public class ScreenBrightness {	public static int getScreenBrightness(Activity activity) {		int value = 0;		ContentResolver cr = activity.getContentResolver();		try {			value = Settings.System.getInt(cr,					Settings.System.SCREEN_BRIGHTNESS);		} catch (SettingNotFoundException e) {		}		return value;	}	public static void setScreenBrightness(Activity activity, int value) {		WindowManager.LayoutParams params = activity.getWindow()				.getAttributes();		params.screenBrightness = value / 255f;		activity.getWindow().setAttributes(params);	}}

此类直接调用系统功能来调节屏幕参数！

注意如果调用

setScreenBrightness()

方法时传入的value值为0，那屏幕就全暗了，然后你的设备就一直暗着，直到重新启动系统了，所以在调用前最好先对传值进行下处理