二维码扫描（ZXing）

首先加依赖
implementation ‘cn.bingoogolapple:bga-qrcode-zxing:1.2.1’

布局

<cn.bingoogolapple.qrcode.zxing.ZXingView
android:id="@+id/zxingview"
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
app:qrcv_animTime=“1000”
app:qrcv_borderColor="@android:color/white"
app:qrcv_borderSize=“1dp”
app:qrcv_cornerColor="@color/colorPrimaryDark"
app:qrcv_cornerLength=“20dp”
app:qrcv_cornerSize=“3dp”
app:qrcv_maskColor="#33FFFFFF"
app:qrcv_rectWidth=“200dp”
app:qrcv_scanLineColor="@color/colorPrimaryDark"
app:qrcv_scanLineSize=“1dp”
app:qrcv_topOffset=“90dp” />

MainActivity

package com.lll.zxing;

import android.Manifest;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import cn.bingoogolapple.qrcode.core.QRCodeView;
import cn.bingoogolapple.qrcode.zxing.ZXingView;

public class MainActivity extends AppCompatActivity implements QRCodeView.Delegate {

private ZXingView mZXingView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mZXingView = findViewById(R.id.zxingview);
    mZXingView.setDelegate(this);
    //动态权限
    String[] p = new String[]{Manifest.permission.CAMERA};
    ActivityCompat.requestPermissions(MainActivity.this, p, 1);
}

@Override
public void onScanQRCodeSuccess(String result) {
    Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
}

@Override
public void onScanQRCodeOpenCameraError() {

}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if (grantResults.length > 0) {
        int result = grantResults[0];
        if (result == PackageManager.PERMISSION_GRANTED) {
            //权限同意
            mZXingView.startSpot();
        } else {
            //权限拒绝
            Toast.makeText(MainActivity.this, "请同意打开摄像头权限", Toast.LENGTH_SHORT).show();
        }
    }
}

}