0

我一直在尝试在我的代码扫描应用程序中实现打开/关闭手电筒，但我没有找到解决我面临的问题的好方法。

负责扫描代码的代码：( MainActivity.kt)

val clipboard = getSystemService(context, ClipboardManager::class.java)
val compoundBarcodeView = remember {
    CompoundBarcodeView(context).apply {
        val capture = CaptureManager(activity, this)
        capture.initializeFromIntent(
            Intent(Intent.ACTION_MEDIA_SCANNER_STARTED).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK),
            null
        )
        this.setStatusText("")
        capture.decode()
        this.resume()
        this.decodeSingle { result ->
            result.text?.let { barCodeOrQr ->
                contentOfScannedCode = barCodeOrQr
                showPopup = true // basically this takes care of displaying a popup message, you do not have to add this
            }
        }
    }
}

后来这被使用：

if(!showPopup) {
    AndroidView(
        modifier = Modifier.fillMaxSize(),
        factory = { compoundBarcodeView },
    )
    Row(
        Modifier
            .padding(15.dp)
            .border(
                width = 1.dp,
                color = colorResource(id = R.color.button_background_light_blue),
                shape = RoundedCornerShape(10.dp)
            )
    ){
        IconButton(onClick = {}) {
            Icon(painterResource(id = R.drawable.ic_photo), contentDescription = "scan code from image", tint = colorResource(
                id = R.color.button_background_light_blue
            ))
        }
        IconButton(onClick = {
            currentFlashlightMode = if(currentFlashlightMode == 0) {
                Camera(context).startFlashlight()
                1
            } else {
                Camera(context).stopFlashlight()
                0
            }
        }) {
            Icon(painterResource(id = R.drawable.ic_flashlight), contentDescription = "turn on flashlight", tint = colorResource(
                id = R.color.button_background_light_blue
            ))
        }
    }
}

你可以猜到我想在用户点击手电筒图标时切换手电筒状态，应该处理的代码是：

class Camera(private val context: Context) {
    fun startFlashlight(){
        val canUseFlashlight = context.packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)
        var cameraId = ""
        if(!canUseFlashlight){
            Toast.makeText(context, "your device doesn't support flash light", Toast.LENGTH_SHORT).show()
        } else {
            val camManager = context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
            try {
                cameraId = camManager.cameraIdList[0]
            } catch (e: CameraAccessException) {
                logcat{e.printStackTrace().toString()}
            }

            try {
                logcat { cameraId }
                camManager.setTorchMode(cameraId, true)
            } catch (e: CameraAccessException) {
                logcat{e.printStackTrace().toString()}
            }
        }
    }

    fun stopFlashlight(){
        val canUseFlashlight = context.packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)
        var cameraId = ""
        if(!canUseFlashlight){
            Toast.makeText(context, "your device doesn't support flash light", Toast.LENGTH_SHORT).show()
        } else {
            val camManager = context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
            try {
                cameraId = camManager.cameraIdList[0]
            } catch (e: CameraAccessException) {
                logcat{e.printStackTrace().toString()}
            }

            try {
                logcat { cameraId }
                camManager.setTorchMode(cameraId, false)
            } catch (e: CameraAccessException) {
                logcat{e.printStackTrace().toString()}
            }
        }
    }
}

如果我停止相机，打开/关闭手电筒并恢复相机进度，它可能会起作用，但这似乎对用户不太友好，所以我尝试同时使用手电筒和相机，结果导致

由于现有相机用户（代码 7），相机“0”的手电筒不可用

任何想法如何解决这个问题？

4

0 回答 0