androidx.camera:camera-core:1.0.0-alpha10 You can check is torch available or not with this: val camera = cameraProvider.bindToLifecycle(lifecycleOwner, cameraSelector, preview, imageAnalyzer) camera.cameraInfo.hasFlashUnit() And you can enable torch with: camera.cameraControl.enableTorch(true)
HTC has an alternative API that supports this, however it’s only on HTC Sense devices, and as of Gingerbread they’ve changed the permissions so it’s only for their Flashlight app, not third party ones (unless you use root). But on 2.2 HTC devices you can use it by writing a string to /sys/devices/platform/flashlight.0/leds/flashlight/brightness. This controls … Read more
Every device is a bit different. Samsung especially likes to make things complicated for app developers. On the Galaxy Tab you should be good with: Camera cam; void ledon() { cam = Camera.open(); Parameters params = cam.getParameters(); params.setFlashMode(Parameters.FLASH_MODE_ON); cam.setParameters(params); cam.startPreview(); cam.autoFocus(new AutoFocusCallback() { public void onAutoFocus(boolean success, Camera camera) { } }); } void ledoff() … Read more
I had the same issue that none of the answers here solved, so after solving it I am adding my way of solving it. This applies to new android versions that support setting permissions per app (since Marshmallow, 6.0). The permission for camera could be disabled and should be enabled from the app settings. Settings … Read more
Update #1: (torchActive isn’t returning the expected value; perhaps because it’s been modified) Update #2: For Swift 2.0 To toggle the flash from on to off (not just “on” as in mad pig’s answer), you can use the following method: func toggleFlash() { let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo) if (device.hasTorch) { do { try device.lockForConfiguration() if … Read more