Java 将屏幕亮度控制添加到 android 应用程序
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Adding screen brightness controls to android application
提问by Cymon
I am looking to add controls to adjust screen brightness locally in my app menu but can't seem to figure out how to do it. I have seen examples to max-out or dim brightness but I am looking to add controls so that the user can control and set the brightness level. Does anyone have any examples, tutorials, source code, or just a place to point me in the right direction?
我希望在我的应用程序菜单中添加控件以在本地调整屏幕亮度，但似乎无法弄清楚如何去做。我看过最大化或调暗亮度的示例，但我希望添加控件，以便用户可以控制和设置亮度级别。有没有人有任何例子、教程、源代码，或者只是一个地方来指出我正确的方向？
回答by Jeremy Logan
The internetclaims this works, I haven't tried it though:
互联网声称这有效，但我还没有尝试过：
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 100 / 100.0f;
getWindow().setAttributes(lp);
回答by Timothy Lee Russell
This is answered by a similar question.
这是由一个类似的问题回答的。
The only difference is that you will want to tie the screenBrightnessmember to the value of a user interface control.
唯一的区别是您需要将screenBrightness成员与用户界面控件的值联系起来。
Note that this might not work as expected on devices that have auto-dimming sensors.
请注意，这在具有自动调光传感器的设备上可能无法正常工作。
回答by mylock
You can change the user's brightness setting like this (make sure you declare permission for WRITE_SETTINGS in the manifest)
您可以像这样更改用户的亮度设置（确保在清单中声明对 WRITE_SETTINGS 的权限）
android.provider.Settings.System.putInt(getContentResolver(),
android.provider.Settings.System.SCREEN_BRIGHTNESS, brightpref);
The documentation calls that setting from 0 to 255. I am trying to figure out whether it shuts the screen off at 0, as at one point I had a widget installed with a slider and you'd cause the screen to shut off if you set it to 0.
文档将该设置称为从 0 到 255。我试图弄清楚它是否会在 0 时关闭屏幕，因为有一次我安装了一个带有滑块的小部件，如果你设置，你会导致屏幕关闭它到 0。
