Android 集成二维码扫描功能

实现效果：

实现步骤：

1.Gradle添加二维码包引用。

implementation 'cn.bingoogolapple:bga-qrcode-zbar:1.3.7'

添加好后，点击右上角的“Sync Now”

2.AndroidManifest.xml 增加相关权限配置。

3.测试Activity代码：page_qr.xml

注意：顶部申明许加上 xmlns:app="http://schemas.android.com/apk/res-auto" 这是自定义控件需要申明的命名空间。

4.后置代码 Page_QR.java

package com.example.rc114.ui;

import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Vibrator;
import android.provider.Settings;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import com.example.rc114.R;

import java.util.ArrayList;
import java.util.List;

import cn.bingoogolapple.qrcode.core.QRCodeView;
import cn.bingoogolapple.qrcode.zbar.ZBarView;

public class Page_QR extends AppCompatActivity {
    QRCodeView qrCodeView;
    String[] permissions = new String[]{
            Manifest.permission.CAMERA,
            Manifest.permission.VIBRATE
    };
    private final int permissionCode = 100;//权限请求码

    //检查权限
    private void checkPermission() {
        List permissionList = new ArrayList<>();
        for (int i = 0; i < permissions.length; i++) {
            if (ContextCompat.checkSelfPermission(this, permissions[i]) != PackageManager.PERMISSION_GRANTED) {
                permissionList.add(permissions[i]);
            }
        }
        if (permissionList.size() <= 0) {
            //说明权限都已经通过，可以做你想做的事情去
            bindEvent();
        } else {
            //存在未允许的权限
            ActivityCompat.requestPermissions(this, permissions, permissionCode);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        boolean haspermission = false;
        if (permissionCode == requestCode) {
            for (int i = 0; i < grantResults.length; i++) {
                if (grantResults[i] == -1) {
                    haspermission = true;
                }
            }
            if (haspermission) {
                //跳转到系统设置权限页面，或者直接关闭页面，不让他继续访问
                permissionDialog();
            } else {
                //全部权限通过，可以进行下一步操作
                bindEvent();
            }
        }
    }

    AlertDialog alertDialog;

    //打开手动设置应用权限
    private void permissionDialog() {
        if (alertDialog == null) {
            alertDialog = new AlertDialog.Builder(this)
                    .setTitle("提示信息")
                    .setMessage("当前应用缺少必要权限，该功能暂时无法使用。如若需要，请单击【确定】按钮前往设置中心进行权限授权。")
                    .setPositiveButton("设置", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            cancelPermissionDialog();
                            Uri packageURI = Uri.parse("package:" + getPackageName());
                            Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, packageURI);
                            startActivity(intent);
                        }
                    })
                    .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            cancelPermissionDialog();
                        }
                    })
                    .create();
        }
        alertDialog.show();
    }

    private void cancelPermissionDialog() {
        alertDialog.cancel();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.page_qr);

        //6.0才用动态权限
        if (Build.VERSION.SDK_INT >= 23) {
            checkPermission();
        } else {
            bindEvent();
        }
    }

    private void bindEvent() {
        qrCodeView = (ZBarView) findViewById(R.id.zbarview);
        qrCodeView.setDelegate(new QRCodeView.Delegate() {
            @Override
            public void onScanQRCodeSuccess(String result) {
                vibrate();//震动手机
                //扫描成功后处理事件
                Toast.makeText(Page_QR.this, result, Toast.LENGTH_SHORT).show();
                qrCodeView.startSpot();//继续扫描
                TextView txtText = (TextView) findViewById(R.id.txtText);
                txtText.setText(result);
            }

            @Override
            public void onCameraAmbientBrightnessChanged(boolean isDark) {
                // 这里是通过修改提示文案来展示环境是否过暗的状态，接入方也可以根据 isDark 的值来实现其他交互效果
                String tipText = qrCodeView.getScanBoxView().getTipText();
                String ambientBrightnessTip = "\n环境过暗，请打开闪光灯";
                if (isDark) {
                    if (!tipText.contains(ambientBrightnessTip)) {
                        qrCodeView.getScanBoxView().setTipText(tipText + ambientBrightnessTip);
                    }
                } else {
                    if (tipText.contains(ambientBrightnessTip)) {
                        tipText = tipText.substring(0, tipText.indexOf(ambientBrightnessTip));
                        qrCodeView.getScanBoxView().setTipText(tipText);
                    }
                }
            }

            @Override
            public void onScanQRCodeOpenCameraError() {
                Toast.makeText(Page_QR.this, "错误", Toast.LENGTH_SHORT).show();
            }
        });
        qrCodeView.startCamera();

        findViewById(R.id.start_spot).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onStart();
                Toast.makeText(Page_QR.this, "开始扫码", Toast.LENGTH_SHORT).show();
            }

        });

        findViewById(R.id.stop_spot).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                onStop();
                Toast.makeText(Page_QR.this, "停止扫码", Toast.LENGTH_SHORT).show();
            }
        });

        findViewById(R.id.open_flashlight).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                qrCodeView.openFlashlight();
                Toast.makeText(Page_QR.this, "打开闪光灯", Toast.LENGTH_SHORT).show();
            }
        });

        findViewById(R.id.close_flashlight).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                qrCodeView.closeFlashlight();
                Toast.makeText(Page_QR.this, "关闭闪光灯", Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        qrCodeView.startCamera();//打开后置摄像头开始预览，但是并未开始识别
        qrCodeView.startSpotAndShowRect(); // 显示扫描框，并开始识别

//        mQRCodeView.showScanRect();//显示扫描框
//        mQRCodeView.startSpot();//开始识别二维码
        //mQRCodeView.openFlashlight();//开灯
        //mQRCodeView.closeFlashlight();//关灯
    }

    @Override
    protected void onStop() {
        qrCodeView.stopCamera();// 关闭摄像头预览，并且隐藏扫描框
        super.onStop();
    }

    @Override
    protected void onDestroy() {
        qrCodeView.onDestroy();
        super.onDestroy();
    }

    private void vibrate() {
        Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
        vibrator.vibrate(200);
    }

}

参考：https://www.jianshu.com/p/b55808410cd7