Android 扫描车牌（免费的识别开源库（Scanner））

项目中涉及到车牌识别、银行卡识别、驾驶证识别（等）

总依赖

implementation 'com.shouzhong:Scanner:1.1.3'

选择性依赖

// zxing
implementation 'com.google.zxing:core:3.3.3'
// zbar
implementation 'com.shouzhong:ScannerZBarLib:1.0.0'
// 银行卡识别
implementation 'com.shouzhong:ScannerBankCardLib:1.0.3'
// 身份证识别
implementation 'com.shouzhong:ScannerIdCardLib:1.0.4'
// 车牌识别
implementation 'com.shouzhong:ScannerLicensePlateLib:1.0.3'
// 图片文字识别
implementation 'com.shouzhong:ScannerTextLib:1.0.0'
// 黄图识别
implementation 'com.shouzhong:ScannerNsfwLib:1.0.0'
// 驾驶证识别
implementation 'com.shouzhong:ScannerDrivingLicenseLib:1.0.1'
// 身份证识别（第二种方式）
implementation 'com.shouzhong:ScannerIdCard2Lib:1.0.0'

如果依赖下载缓慢请在proiect中的build.gradle

allprojects {
    repositories {
        google()
        mavenCentral()
        //添加这一行
        maven { url 'https://jitpack.io' }
        jcenter() // Warning: this repository is going to shut down soon
    }
}

开源库地址 开源库最新版本请看wiki

代码示例

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".OCRActivity">

    <com.shouzhong.scanner.ScannerView
        android:id="@+id/sv"
        android:layout_width="match_parent"
        android:layout_height="1080px"
        android:background="#000000" />

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

主要代码

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Vibrator;
import android.view.View;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.shouzhong.scanner.Callback;
import com.shouzhong.scanner.IViewFinder;
import com.shouzhong.scanner.Result;
import com.shouzhong.scanner.ScannerView;

public class OCRActivity extends AppCompatActivity {

    private Vibrator vibrator;
    private ScannerView scannerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ocractivity);
        scannerView = findViewById(R.id.sv);
        TextView viewById = findViewById(R.id.tv_name);
        scannerView.setViewFinder(new ViewFinder(this));
//        scannerView.setSaveBmp(true);
//        scannerView.setEnableZXing(true);
//        scannerView.setEnableZBar(true);
//        scannerView.setEnableBankCard(true);
//        scannerView.setEnableIdCard(true);
        scannerView.setEnableLicensePlate(true);
        scannerView.setCallback(new Callback() {
            @Override
            public void result(Result result) {
                viewById.setText("识别结果：\n" + result.toString());
                startVibrator();
                scannerView.restartPreviewAfterDelay(2000);
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        scannerView.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        scannerView.onPause();
    }

    @Override
    protected void onDestroy() {
        if (vibrator != null) {
            vibrator.cancel();
            vibrator = null;
        }
        super.onDestroy();
    }

    private void startVibrator() {
        if (vibrator == null)
            vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
        vibrator.vibrate(300);
    }

    class ViewFinder extends View implements IViewFinder {
        private Rect framingRect;//扫码框所占区域
        private float widthRatio = 0.9f;//扫码框宽度占view总宽度的比例
        private float heightRatio = 0.8f;
        private float heightWidthRatio = 0.5626f;//扫码框的高宽比
        private int leftOffset = -1;//扫码框相对于左边的偏移量，若为负值，则扫码框会水平居中
        private int topOffset = -1;//扫码框相对于顶部的偏移量，若为负值，则扫码框会竖直居中

        private int laserColor = 0xff008577;// 扫描线颜色
        private int maskColor = 0x60000000;// 阴影颜色
        private int borderColor = 0xff008577;// 边框颜色
        private int borderStrokeWidth = 12;// 边框宽度
        private int borderLineLength = 72;// 边框长度

        private Paint laserPaint;// 扫描线
        private Paint maskPaint;// 阴影遮盖画笔
        private Paint borderPaint;// 边框画笔

        private int position;

        public ViewFinder(Context context) {
            super(context);
            setWillNotDraw(false);//需要进行绘制
            laserPaint = new Paint();
            laserPaint.setColor(laserColor);
            laserPaint.setStyle(Paint.Style.FILL);
            maskPaint = new Paint();
            maskPaint.setColor(maskColor);
            borderPaint = new Paint();
            borderPaint.setColor(borderColor);
            borderPaint.setStyle(Paint.Style.STROKE);
            borderPaint.setStrokeWidth(borderStrokeWidth);
            borderPaint.setAntiAlias(true);
        }

        @Override
        protected void onSizeChanged(int xNew, int yNew, int xOld, int yOld) {
            updateFramingRect();
        }

        @Override
        public void onDraw(Canvas canvas) {
            if (getFramingRect() == null) {
                return;
            }
            drawViewFinderMask(canvas);
            drawViewFinderBorder(canvas);
            drawLaser(canvas);
        }

        private void drawLaser(Canvas canvas) {
            Rect framingRect = getFramingRect();
            int top = framingRect.top + 10 + position;
            canvas.drawRect(framingRect.left + 10, top, framingRect.right - 10, top + 5, laserPaint);
            position = framingRect.bottom - framingRect.top - 25 < position ? 0 : position + 2;
            //区域刷新
            postInvalidateDelayed(20, framingRect.left + 10, framingRect.top + 10, framingRect.right - 10, framingRect.bottom - 10);
        }

        /**
         * 绘制扫码框四周的阴影遮罩
         */
        private void drawViewFinderMask(Canvas canvas) {
            int width = canvas.getWidth();
            int height = canvas.getHeight();
            Rect framingRect = getFramingRect();
            canvas.drawRect(0, 0, width, framingRect.top, maskPaint);//扫码框顶部阴影
            canvas.drawRect(0, framingRect.top, framingRect.left, framingRect.bottom, maskPaint);//扫码框左边阴影
            canvas.drawRect(framingRect.right, framingRect.top, width, framingRect.bottom, maskPaint);//扫码框右边阴影
            canvas.drawRect(0, framingRect.bottom, width, height, maskPaint);//扫码框底部阴影
        }

        /**
         * 绘制扫码框的边框
         */
        private void drawViewFinderBorder(Canvas canvas) {
            Rect framingRect = getFramingRect();

            // Top-left corner
            Path path = new Path();
            path.moveTo(framingRect.left, framingRect.top + borderLineLength);
            path.lineTo(framingRect.left, framingRect.top);
            path.lineTo(framingRect.left + borderLineLength, framingRect.top);
            canvas.drawPath(path, borderPaint);

            // Top-right corner
            path.moveTo(framingRect.right, framingRect.top + borderLineLength);
            path.lineTo(framingRect.right, framingRect.top);
            path.lineTo(framingRect.right - borderLineLength, framingRect.top);
            canvas.drawPath(path, borderPaint);

            // Bottom-right corner
            path.moveTo(framingRect.right, framingRect.bottom - borderLineLength);
            path.lineTo(framingRect.right, framingRect.bottom);
            path.lineTo(framingRect.right - borderLineLength, framingRect.bottom);
            canvas.drawPath(path, borderPaint);

            // Bottom-left corner
            path.moveTo(framingRect.left, framingRect.bottom - borderLineLength);
            path.lineTo(framingRect.left, framingRect.bottom);
            path.lineTo(framingRect.left + borderLineLength, framingRect.bottom);
            canvas.drawPath(path, borderPaint);
        }

        /**
         * 设置framingRect的值（扫码框所占的区域）
         */
        private synchronized void updateFramingRect() {
            Point viewSize = new Point(getWidth(), getHeight());
            int width = getWidth() * 801 / 1080, height = getWidth() * 811 / 1080;
            width = (int) (getWidth() * widthRatio);
//            height = (int) (getHeight() * heightRatio);
            height = (int) (heightWidthRatio * width);

            int left, top;
            if (leftOffset < 0) {
                left = (viewSize.x - width) / 2;//水平居中
            } else {
                left = leftOffset;
            }
            if (topOffset < 0) {
                top = (viewSize.y - height) / 2;//竖直居中
            } else {
                top = topOffset;
            }
            framingRect = new Rect(left, top, left + width, top + height);
        }

        @Override
        public Rect getFramingRect() {
            return framingRect;
        }
    }
}

复制粘贴即可用