I am new to capacitorjs and trying out your plugin BarcodeScanner.

Followed the instructions, defining build.gradle, adding BarcodeScanner.class in MainActivity.
Also, run 'ionic build; ionic cap copy; ionic cap sync' and then re-compile and run on Android device.
In the Ionic App, I have a service providing startScan() function that will be trigger by a user click:

  public startScan = async () => {
    console.log(`here in startScan()`);
    // const { BarcodeScanner } = Plugins;
    BarcodeScanner.hideBackground(); // make background of WebView transparent
    const result = await BarcodeScanner.startScan(); // start scanning and wait for a result
    // if the result has content
    if (result.hasContent) {
      console.log(result.content); // log the raw scanned content
    }
  }

However, it seems it has no function at all. After clicked and called the function, it has no scanning window popped. Can anyone help to give me some hints? Thanks.