android使用zxing实现二维码扫描

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implementation 'com.google.zxing:core:3.3.3' //引入zxing包

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/**
     * 扫描按钮单击事件
     * @param view
     */
    public void startQRCodeHandler(View view) {
        startQrCode();
    }

    /**
     * 启动二维码扫描
     */
    private void startQrCode() {
        // 摄像机申请权限
        if (ContextCompat.checkSelfPermission(HomeActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            // android 6.0以上需要动态申请权限
            ActivityCompat.requestPermissions(HomeActivity.this, new String[]{Manifest.permission.CAMERA}, Constants.REQ_PERM_CAMERA);
            return;
        }
        // 访问手机存储申请权限
        if (ContextCompat.checkSelfPermission(HomeActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            // android 6.0以上需要动态申请权限
            ActivityCompat.requestPermissions(HomeActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, Constants.REQ_PERM_CAMERA);
            return;
        }
        // 二维码扫码
        Intent intent = new Intent(HomeActivity.this, CaptureActivity.class);
        startActivityForResult(intent, Constants.REQ_QR_CODE);
    }

    /**
     * 重载扫描页activity返回函数（接受扫描码）
     * @param requestCode
     * @param resultCode
     * @param data
     */
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //扫描结果回调
        if (resultCode == Activity.RESULT_OK){
            if(requestCode == Constants.REQ_QR_CODE || requestCode == Constants.REQUEST_CODE_SCAN_GALLERY){
                //扫描二维码或者扫描相册成功
                Bundle bundle = data.getExtras();
                String scanResult = bundle.getString(Constants.INTENT_EXTRA_KEY_QR_SCAN);
                Toast.makeText(HomeActivity.this,"扫描成功",Toast.LENGTH_SHORT).show();
                //将扫描出的信息显示出来
                //textView.setText(scanResult);
                showRemindDialog("温馨提示",scanResult);
            }
        } else {
            Toast.makeText(HomeActivity.this,"取消扫描",Toast.LENGTH_SHORT).show();
        }
    }

    /**
     * 重载请求权限结果函数
     * @param requestCode
     * @param permissions
     * @param grantResults
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case Constants.REQ_PERM_CAMERA:
                // 摄像头权限申请
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // 获得授权
                    startQrCode();
                } else {
                    // 被禁止授权
                    Toast.makeText(HomeActivity.this, "请至权限中心打开本应用的相机访问权限", Toast.LENGTH_LONG).show();
                }
                break;
        }
    }

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    <uses-permission android:name="android.permission.INTERNET" /> <!-- 网络权限 -->
    <uses-permission android:name="android.permission.VIBRATE" /> <!-- 震动权限 -->
    <uses-permission android:name="android.permission.CAMERA" /> <!-- 摄像头权限 -->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <!-- 读取手机存储权限 -->
    <uses-feature android:name="android.hardware.camera.autofocus" /> <!-- 自动聚焦权限 -->