Android基于MLKit实现条形码扫码的代码示例

//公共库
implementation ''com.github.jenly1314.MLKit:mlkit-common:2.0.0'
//条码识别
implementation 'com.github.jenly1314.MLKit:mlkit-barcode-scanning:2.0.0'

class BarcodeScanningActivity : BarcodeCameraScanActivity() {
    override fun initCameraScan(cameraScan: CameraScan<MutableList<Barcode>>) {
        super.initCameraScan(cameraScan)
        cameraScan.setPlayBeep(true)
            .setVibrate(true)
    }
    override fun onScanResultCallback(result: AnalyzeResult<MutableList<Barcode>>) {
        cameraScan.setAnalyzeImage(false)
        Toast.makeText(this, "result:${result.result[0].displayValue}", Toast.LENGTH_SHORT).show()
    }
    override fun getLayoutId(): Int = R.layout.custom_camera_scan
    override fun getFlashlightId(): Int = View.NO_ID
}

<?xml version="1.0" encoding="UTF-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <androidx.camera.view.PreviewView
        android:id="@+id/previewView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    <com.king.view.viewfinderview.ViewfinderView
        android:id="@+id/viewfinderView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    <!-- 只需保证有布局内有PreviewView即可，然后自己可根据需要添加的控件 -->
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Put the barcode in the window"
        android:layout_gravity="bottom|center_horizontal"
        android:layout_marginBottom="50dp"
        android:textColor="@color/white"/>
</FrameLayout>

        findViewById<Button>(R.id.bt).setOnClickListener {
            startActivity(Intent(this, BarcodeScanningActivity::class.java))
        }

    private fun openGallery() {
        val intent = Intent()
        intent.type = "image/*"
        intent.action = Intent.ACTION_GET_CONTENT
        openGalleryRequest.launch(Intent.createChooser(intent, "识别相册二维码图片"))
    }

    private val openGalleryRequest =
        registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
            if (it.resultCode == RESULT_OK) {
                it.data?.data?.let { uri -> handleImage(uri) }
            }
        }

    private fun processPhoto(data: Uri?) {
        data?.let {
            try {
                val srcBitmap = MediaStore.Images.Media.getBitmap(contentResolver, it)
                BarcodeDecoder.process(srcBitmap, object : Analyzer.OnAnalyzeListener<List<Barcode>?> {
                    override fun onSuccess(result: List<Barcode>) {
                        if (result.isNotEmpty()) {
                            Toast.makeText(this@MainActivity, "result:${result[0].displayValue}", Toast.LENGTH_SHORT).show()
                        } else {
                            Toast.makeText(this@MainActivity, "result is null", Toast.LENGTH_SHORT).show()
                        }
                    }
                    override fun onFailure(e: Exception?) {
                        Toast.makeText(this@MainActivity, "onFailure", Toast.LENGTH_SHORT).show()
                    }
                    // 如果指定具体的识别条码类型，速度会更快
                }, Barcode.FORMAT_ALL_FORMATS)
            } catch (e: Exception) {
                e.printStackTrace()
                Toast.makeText(this@MainActivity, e.message, Toast.LENGTH_SHORT).show()
            }
        }
    }