Android调节屏幕亮度工具类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
QQ技术交流群:129518033
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