How to blink flashlight using "kotlin" on button click in android studio-CodePudding

I am an absolute beginner and just want to create an app in kotlin in which I just click a button and the flashlight of the phone blinks once please help this is urgent.

CodePudding user response：

Please check this answer. Also don't forgot to include camera permissions in manifest and request permission before turning on flash light

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

https://stackoverflow.com/a/63259765/16098431

CodePudding user response：

first add these two permissions to your manifest

   <uses-permission android:name="android.permission.CAMERA" />
   <uses-feature android:name="android.hardware.camera.flash" />

Now use this function to switch the flash light status

private fun switchFlashLight(status: Boolean) {
        val cameraManager = getSystemService(Context.CAMERA_SERVICE) as CameraManager
        try {
            val cameraId = cameraManager.cameraIdList[0]

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                cameraManager.setTorchMode(cameraId, status)
            }
        } catch (e: CameraAccessException) {
            e.printStackTrace()
        }
    }