android - 扫描仪返回 null

Question

我使用第 3 方库( Zxing) 进行条码扫描。扫描的结果是null。扫描后我尝试将结果添加到 alabel但结果是null.

这是我的代码：

if (requestCode === SCANNER_REQUEST_CODE && resultCode === android.app.Activity.RESULT_OK) {
  // Handle successful scan
  var contents = intent.getStringExtra("SCAN_RESULT");
  var format = intent.getStringExtra("SCAN_RESULT_FORMAT");
  // var scanned = page.getViewById("scanned");
  //scanned.url = "";
  pageData.set("message", contents);
  page.bindingContext = pageData;
}