For this problem you should:.Check whether the flashlight isavailable or not?.If so then Turn Off/On.If not then you can do whatever, according to your appneeds.For Checking availability of flash in the device:You can use the following: context.getPackageManager.hasSystemFeature(PackageManager.FEATURECAMERAFLASH);which will return true if a flash is available, false if not.See:for more information.For turning on/off flashlight:I googled out and got this about android.permission.FLASHLIGHT. Android manifests' permission looks promising:
Here (Note: This link is now broken)For Flashlight directly look (Note: This link is now broken)Update6You could also try to add a SurfaceView as described in this answerThis seems to be a solution that works on many phones.Update 5 Major UpdateI have found an alternative Link (for the broken links above): You can now use this link. Update: 14/9/2012 This link is now brokenUpdate 1Another OpenSource Code:Update 2Example showing how to enable the LED on a Motorola Droid:Another Open Source Code:Update 3 (Widget for turning on/off camera led)If you want to develop a widget that turns on/off your camera led, then you must refer my answer.Update 4If you want to set the intensity of light emerging from camera LED you can refer full post. Note that only rooted HTC devices support this feature. Issues:.There are also some problems while turning On/Off flashlight.
For the devices not having FLASHMODETORCH or even if it has, then flashlight does not turn ON etc.Typically Samsung creates a lot of problems.You can refer to problems in the given below list. Android Lollipop introduced camera2 API and deprecated the previous camera API. However, using the deprecated API to turn on the flash still works and is much simpler than using the new API.It seems that the new API is intended for use in dedicated full featured camera apps and that its architects didn't really consider simpler use cases such as turning on the flashlight. To do that now, one has to get a CameraManager, create a CaptureSession with a dummy Surface, and finally create and start a CaptureRequest.
Exception handling, resource cleanup and long callbacks included!To see how to turn the flashlight on Lollipop and newer, take a look at the in the AOSP project (try to find the newest as older use APIs that have been modified). Don't forget to set the needed permissions.Android Marshmallow finally introduced a simple way to turn on the flash with.
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I trying to install five times 1809 update (not clear windows install from 1803 build) and all things worked fine except this shitty flashlight. In menu when i press windows button on controller i see the picture, video, volume buttons and empty circle for flashlight. After the group is created, you can just ask Alexa to turn on the lights and the lights you associated with that Amazon Echo device will turn on. You can also control any other light setting such as dim level and color using the same command.
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