Android摄像头识别多个二维码并绘制识别区域

说起Android扫描二维码，可能很多人都会想到用zxing，个人感觉不是很好用，后来使用华为的“统一扫码服务”，用着还行，不用开发者再辛苦钻研不同手机的分辨率以及方向了，如今机器学习热度这么高，各大厂商已经把条码识别归入机器学习SDK，本文要介绍的就是使用谷歌的 CameraX 以及机器学习，实现二维码识别，超级简单！

1、相机权限那是少不了的，添加如下权限：

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

2、添加相关依赖：

    def camerax_version = "1.2.0-beta02"
    implementation "androidx.camera:camera-camera2:${camerax_version}"
    implementation "androidx.camera:camera-core:${camerax_version}"
    implementation "androidx.camera:camera-extensions:${camerax_version}"
    implementation "androidx.camera:camera-lifecycle:${camerax_version}"
    implementation "androidx.camera:camera-view:${camerax_version}"
    implementation "androidx.camera:camera-video:${camerax_version}"
    implementation "androidx.camera:camera-mlkit-vision:${camerax_version}"
    implementation 'com.google.mlkit:barcode-scanning:17.0.3'//扫码库
    implementation 'com.google.guava:guava:27.1-android'

3、从官方的示例代码复制两份代码

GraphicOverlay.java

BarcodeGraphic.kt

4、布局文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.camera.view.PreviewView
        android:id="@+id/previewView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <site.feiyuliuxing.camera2test.widget.GraphicOverlay
        android:id="@+id/overlayView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintStart_toStartOf="@id/previewView"
        app:layout_constraintTop_toTopOf="@id/previewView"
        app:layout_constraintEnd_toEndOf="@id/previewView"
        app:layout_constraintBottom_toBottomOf="@id/previewView" />

</androidx.constraintlayout.widget.ConstraintLayout>

 5、主要代码

import android.annotation.SuppressLint
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.camera.core.CameraSelector
import androidx.camera.core.Preview
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.camera.mlkit.vision.MlKitAnalyzer
import androidx.camera.view.CameraController
import androidx.camera.view.LifecycleCameraController
import androidx.camera.view.PreviewView
import androidx.core.content.ContextCompat
import androidx.lifecycle.LifecycleOwner
import com.google.common.util.concurrent.ListenableFuture
import com.google.mlkit.vision.barcode.BarcodeScannerOptions
import com.google.mlkit.vision.barcode.BarcodeScanning
import com.google.mlkit.vision.barcode.common.Barcode

class MainActivity : AppCompatActivity() {
    private lateinit var previewView: PreviewView
    private lateinit var cameraController: LifecycleCameraController
    private lateinit var graphicOverlay: GraphicOverlay

    @SuppressLint("MissingInflatedId")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        //申请权限
        PermissionUtil.requestPermissions(this)

        graphicOverlay = findViewById(R.id.overlayView)
        cameraController = LifecycleCameraController(this)
        cameraController.bindToLifecycle(this)
        previewView = findViewById(R.id.previewView)
        previewView.controller = cameraController
        listenBarcodeScanning()

    }

    override fun onResume() {
        super.onResume()
        graphicOverlay.clear()
    }

    private fun listenBarcodeScanning() {
        val options = BarcodeScannerOptions.Builder()
            .setBarcodeFormats(Barcode.FORMAT_QR_CODE)
            .build()
        val barcodeScanner = BarcodeScanning.getClient(options)
        cameraController.setImageAnalysisAnalyzer(
            ContextCompat.getMainExecutor(this),
            MlKitAnalyzer(
                listOf(barcodeScanner),
                CameraController.COORDINATE_SYSTEM_VIEW_REFERENCED,
                ContextCompat.getMainExecutor(this)
            ) { result ->
                result.getValue(barcodeScanner)?.let { barcodeList ->
                    graphicOverlay.clear()
                    barcodeList.forEach { barcode ->
                        //barcode还包含其他一些信息，比如根据位置，区域等可以绘制自己的UI
                        println("### ${barcode.rawValue}")
                        graphicOverlay.add(BarcodeGraphic(graphicOverlay, barcode))
                    }
                    graphicOverlay.invalidate()
                }
            })
    }

}

最后附上效果图

最后

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