利用com.journeyapps:zxing-android-embedded:3.6.0实现扫码
 
在配置文件中进行如下配置：
implementation 'com.google.zxing:core:3.4.0'
implementation 'com.journeyapps:zxing-android-embedded:3.6.0'
 
给integrator添加RequestCode，如下红色
private void scan_qrcode()
{
    IntentIntegrator integrator = new IntentIntegrator(ScanActivity.this);
    integrator.setCaptureActivity(CaptureActivityAnyOrientation.class)
    .setRequestCode(SCAN_CODE)
    .setOrientationLocked(true)
    .setPrompt(getString(R.string.s_scan_text))
    .setBarcodeImageEnabled(false)
    .setBeepEnabled(false)
    .initiateScan();
}
 
发现在onActivityResult中怎么也获取不到二维码数据，后来发现是用错了方法。
不应该用IntentIntegrator.parseActivityResult(requestCode，resultCode, intent)
而是要用IntentIntegrator.parseActivityResult(resultCode, intent)
onActivityResult代码如下：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent)
{
    if (resultCode == RESULT_OK)
    {
        if (requestCode == SCAN_CODE)
        {
            IntentResult scanResult = IntentIntegrator.parseActivityResult(resultCode, intent);
            final String qrContent = scanResult.getContents();
            tv_result.setText(qrContent);
        }
    }
    super.onActivityResult(requestCode, resultCode, intent);
}