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zxing - 将 Zxing 库与 Jetpack 组合使用

问题描述

我正在尝试使用 zxing 库实现 qr 扫描仪。为此，我在屏幕上添加了一个按钮，单击它，我将启动扫描仪，如下所示

Button(
        onClick = {
            val intentIntegrator = IntentIntegrator(context)
            intentIntegrator.setPrompt(QrScanLabel)
            intentIntegrator.setOrientationLocked(true)
            intentIntegrator.initiateScan()
        },
        modifier = Modifier
            .fillMaxWidth()
    ) {
        Text(
            text = QrScanLabel
        )
    }

但是，它启动了一个意图，该意图期望onActivityResult方法能够取回结果。Jetpack compose 使用rememberLauncherForActivityResult如下

val intentLauncher = rememberLauncherForActivityResult(
        contract = ActivityResultContracts.StartIntentSenderForResult()
    ) {
        if (it.resultCode != RESULT_OK) {
            return@rememberLauncherForActivityResult
        }
        ...
    }

但是我们如何在这里将两者整合在一起呢？

标签： zxingandroid-jetpack-compose

解决方案

我使用相同的库制作了一个临时解决方案：Gradle 依赖项：

implementation('com.journeyapps:zxing-android-embedded:4.1.0') { transitive = false }
implementation 'com.google.zxing:core:3.4.0'

我的带有 jetpack compose 和相机捕捉的新屏幕，适用于我的应用程序：

@Composable
fun AdminClubMembershipScanScreen(navController: NavHostController) {
    val context = LocalContext.current
    var scanFlag by remember {
        mutableStateOf(false)
    }

    val compoundBarcodeView = remember {
        CompoundBarcodeView(context).apply {
            val capture = CaptureManager(context as Activity, this)
            capture.initializeFromIntent(context.intent, null)
            this.setStatusText("")
            capture.decode()
            this.decodeContinuous { result ->
                if(scanFlag){
                    return@decodeContinuous
                }
                scanFlag = true
                result.text?.let { barCodeOrQr->
                    //Do something and when you finish this something
                    //put scanFlag = false to scan another item
                    scanFlag = false
                }
                //If you don't put this scanFlag = false, it will never work again.
                //you can put a delay over 2 seconds and then scanFlag = false to prevent multiple scanning 
                
            }
        }
    }

    AndroidView(
        modifier = Modifier,
        factory = { compoundBarcodeView },
    )
}

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