转载自:https://www.jb51.net/article/136383.html
1、声明需要的权限
<uses-permission android:name="android.permission.CHANGE_CONFIGURATION"/>
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
2、判断是否开启了自动亮度调节
public static boolean isAutoBrightness(Context context) {
ContentResolver resolver = context.getContentResolver();
boolean automicBrightness = false;
try {
automicBrightness = Settings.System.getInt(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE) == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
} catch (Settings.SettingNotFoundException e) {
e.printStackTrace();
}
return automicBrightness;
}
3、获取当前屏幕亮度
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;
}
4、关闭自动亮度调节
public static boolean autoBrightness(Context activity, boolean flag) {
int value = 0;
if (flag) {
value = Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC; //开启
} else {
value = Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;//关闭
}
return Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
value);
}
5、设置亮度,退出app也能保持该亮度值
public static void saveBrightness(Context context, int brightness) {
ContentResolver resolver = context.getContentResolver();
Uri uri = android.provider.Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS);
android.provider.Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, brightness);
resolver.notifyChange(uri, null);
}
6、设置当前activity显示的亮度
public static void setBrightness(Activity activity, int brightness) {
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
activity.getWindow().setAttributes(lp);
}