Android调剂屏幕亮度工具类BrightnessUtils

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项目需要做了一个调节屏幕的工具类

/* * Android调节屏幕亮度工具类 * by itas109 * http://blog.csdn.net/itas109 *  * 注意：需要添加setting权限 * <uses-permission android:name="android.permission.WRITE_SETTINGS" /> */public class BrightnessUtils {	// 判断是否开启了自动亮度调节	public static boolean IsAutoBrightness(Context context) {		boolean IsAutoBrightness = false;		try {			IsAutoBrightness = Settings.System.getInt(					context.getContentResolver(),					Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;		}		catch (SettingNotFoundException e)		{			e.printStackTrace();		}		return IsAutoBrightness;	}	// 获取当前屏幕的亮度	public static int getScreenBrightness(Context context) {		int nowBrightnessValue = 0;		ContentResolver resolver = context.getContentResolver();		try {			nowBrightnessValue = android.provider.Settings.System.getInt(					resolver, Settings.System.SCREEN_BRIGHTNESS);		}		catch (Exception e) {			e.printStackTrace();		}		return nowBrightnessValue;	}	// 设置亮度	// 程序退出之后亮度失效	public static void setCurWindowBrightness(Context context, int brightness) {		// 如果开启自动亮度，则关闭。否则，设置了亮度值也是无效的		if (IsAutoBrightness(context)) {			stopAutoBrightness(context);		}		// context转换为Activity		Activity activity = (Activity) context;		WindowManager.LayoutParams lp = activity.getWindow().getAttributes();		// 异常处理		if (brightness < 1) {			brightness = 1;		}		// 异常处理		if (brightness > 255) {			brightness = 255;		}		lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);		activity.getWindow().setAttributes(lp);	}	// 设置系统亮度	// 程序退出之后亮度依旧有效	public static void setSystemBrightness(Context context, int brightness) {		// 异常处理		if (brightness < 1) {			brightness = 1;		}		// 异常处理		if (brightness > 255) {			brightness = 255;		}		saveBrightness(context, brightness);	}	// 停止自动亮度调节	public static void stopAutoBrightness(Context context) {		Settings.System.putInt(context.getContentResolver(),		Settings.System.SCREEN_BRIGHTNESS_MODE,		Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);	}	// 开启亮度自动调节	public static void startAutoBrightness(Context context) {		Settings.System.putInt(context.getContentResolver(),		Settings.System.SCREEN_BRIGHTNESS_MODE,		Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);	}	// 保存亮度设置状态	public static void saveBrightness(Context context, int brightness) {		Uri uri = android.provider.Settings.System				.getUriFor("screen_brightness");		android.provider.Settings.System.putInt(context.getContentResolver(),				"screen_brightness", brightness);		context.getContentResolver().notifyChange(uri, null);	}}

运行效果图

工程下载地址：

http://download.csdn.net/detail/itas109/8706979

如需转载请标明出处：http://blog.csdn.net/itas109

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