WebView methods on same thread error
The JavaScript method is executed on a background (i.e. non-UI) thread. You need to call all Android View related methods on the UI thread. You can achieve what you need with:
mWebView.post(new Runnable() { @Override public void run() { mWebView.loadUrl(...). }});
Which will post the task to run on the UI thread.
In my case nothing was shown in a WebView, so I prefer another way:
runOnUiThread(new Runnable() { @Override public void run() { final WebView webView = (WebView) findViewById(R.id.map); webView.loadDataWithBaseURL(...); }});
Java version: You must to use Runnable interface and Post to Handler.
webView.post(new Runnable() { @Override public void run() { webView.loadUrl("file:///android_asset/www/index.html"); } });
Kotlin version:
webView.post(new Runnable { webView.loadUrl("file:///android_asset/www/index.html")})