Android: How to launch the camera when selecting a file?

File selection is triggered by the HTML <input type="file"> element, which supports an optional "capture" attribute that instructs the browser to launch the device's camera instead of a file picker. If the web page's file input element includes the capture attribute, then 3D WebView for Android launches the camera instead of a file picker. So, if the web page is one that you control (i.e. it's your website), you can add the capture attribute to the file input element to make it launch the camera. If the web page is not one that you control (i.e. it's a third party website), and you want to force it to launch the camera, then here are some options:

1. The first option is to use IWebView.ExecuteJavaScript() to execute JavaScript that adds the capture attribute to the file input element, like this:

   await webViewPrefab.WaitUntilInitialized();
   await webViewPrefab.WebView.WaitForNextPageLoadToFinish();
   await webViewPrefab.WebView.ExecuteJavaScript(@"
       // Every 250ms, check for any file input elements without the capture attribute.
       setInterval(() => {
           const fileInputs = document.querySelectorAll('input[type=file]:not([capture])');
           for (const fileInput of fileInputs) {
               fileInput.setAttribute('capture', 'environment');
           }
       }, 250);
   ");

2. The other option is to use the IWithFileSelection interface to completely override file selection and create your own custom file selection implementation.