Javascript on Android WebView not working

Question

I have some issues with Android WebView and Javascript. Some of customers of app said that WebView on app is not showing anything. As I checked - its probably not showing javascript at all (whole webpage is loaded in javascript by react).

That my code:

    public void setupWebView(WebView accessWebView) {
    accessWebView.setWebViewClient(new WebViewClient() {

        @SuppressWarnings("deprecation")
        @Override
        public boolean shouldOverrideUrlLoading(WebView webView, String url) {
            handleRedirect(accessWebView);
            return true;
        }

    });
    accessWebView.getSettings().setJavaScriptEnabled(true);
    accessWebView.getSettings().setDomStorageEnabled(true);
    accessWebView.loadUrl(URL);

(I have to use WebViewClient, not WebChromeClient, because of the redirect handling)

Is there anything possible to change so the javascript will load on EVERY device with Android +5.0? Is it possible that updating WebView on device will help some users?

Answer 1

You need to use setWebChromeClient to enable javascript in your WebView. But don't worry, you can use both setWebChromeClient and setWebViewClient in the same time. Just like in official docs:

  // Let's display the progress in the activity title bar, like the
  // browser app does.
  getWindow().requestFeature(Window.FEATURE_PROGRESS);

  webview.getSettings().setJavaScriptEnabled(true);

  final Activity activity = this;
  webview.setWebChromeClient(new WebChromeClient() {
    public void onProgressChanged(WebView view, int progress) {
      // Activities and WebViews measure progress with different      scales.
      // The progress meter will automatically disappear when we reach 100%
      activity.setProgress(progress * 1000);
    }
  });
  webview.setWebViewClient(new WebViewClient() {
    public void onReceivedError(WebView view, int errorCode, String      description, String failingUrl) {
      Toast.makeText(activity, "Oh no! " + description,      Toast.LENGTH_SHORT).show();
    }
  });

  webview.loadUrl("https://developer.android.com/");

https://developer.android.com/reference/android/webkit/WebView.html