怎样才能让android的屏幕亮度保持不变？

Question

我已经设法使用以下代码更改活动（以及整个应用程序的扩展）中的屏幕亮度：

Settings.System.putFloat(this.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS, ((float)LocationService.settings.screenBrightness));

WindowManager.LayoutParams lp = getWindow().getAttributes();
float brightness = someValue;
lp.screenBrightness = brightness;
getWindow().setAttributes(lp);

但是，一旦我关闭应用程序，亮度就会恢复到以前的设置。 有没有办法让这些更改在应用程序的生命周期之外持续存在？

谢谢！

Answer 1

尝试这个

Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);

int brightnessLevel = 255;
Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, brightnessLevel);

您需要在 AndroidManifest.xml 中设置 WRITE_SETTINGS 权限

http://android-er.blogspot.com/2011/02/change-system-screen-brightness-using.html

Answer 2

设置应用程序这样做：

private static final int MINIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_DIM + 10;
private static final int MAXIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_ON;

System.putInt(getContext().getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, value + MINIMUM_BACKLIGHT);

但我怀疑如果没有系统共享用户 ID，您将无法更改系统设置

Answer 3

在 androidMainfest.xml 中提供权限

<uses-permission android:name="android.permission.WRITE_SETTINGS"/>

并提供一个介于 0 到 255 之间的 integer 数

//number>=0 && number<=255
//If you have passed context then you can use context.getContentResolver()
android.provider.Settings.System.putInt(cgetContentResolver(),
            android.provider.Settings.System.SCREEN_BRIGHTNESS,
            number);

Answer 4

这里也许可以帮助你：

WindowManager.LayoutParams layoutParams = getWindow().getAttributes();  
layoutParams.buttonBrightness = value;
getWindow().setAttributes(layoutParams);