Android WebView err_unknown_url_scheme

You have to set a client in the webview and pass these to an intent

webView.setWebViewClient(new WebViewClient() {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if( URLUtil.isNetworkUrl(url) ) {
                return false;
            }
            if (appInstalledOrNot(url)) {
                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
                startActivity( intent );
            } else {
                // do something if app is not installed
            }
            return true;
        }

    });
}

You can have a method to check if app is installed

private boolean appInstalledOrNot(String uri) {
        PackageManager pm = getPackageManager();
        try {
            pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
            return true;
        } catch (PackageManager.NameNotFoundException e) {
        }

        return false;
    }

You need override the method shouldOverrideUrlLoading of WebViewClient in which you can control link transfer by yourself.

Because html links that starts with mailto: whatsapp: and tg: (Telegram). is not common url start with "http://" or "https://", so WebView cannot parse it to right place, we should use intent to redirect the url.

For example:

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                if (url == null || url.startsWith("http://") || url.startsWith("https://")) return false;

                try {
                    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
                    view.getContext().startActivity(intent);
                    return true;
                } catch (Exception e) {
                    Log.i(TAG, "shouldOverrideUrlLoading Exception:" + e);
                    return true;
                }
            }

then setWebViewClient to your WebView, like this:

    public class MainActivity extends Activity {

    private WebView mWebView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mWebView = (WebView) findViewById(R.id.activity_main_webview);

        // Force links and redirects to open in the WebView instead of in a browser
        mWebView.setWebViewClient(new WebViewClient() {

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            if (url == null || url.startsWith("http://") || url.startsWith("https://")) return false;

            try {
                Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
                view.getContext().startActivity(intent);
                return true;
            } catch (Exception e) {
                Log.i(TAG, "shouldOverrideUrlLoading Exception:" + e);
                return true;
            }
        }
        });

        // Enable Javascript
        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);

        // Use remote resource
        mWebView.loadUrl("http://myexample.com");
    }}

@Override
        public boolean shouldOverrideUrlLoading(WebView wv, String url) {
            if(url.startsWith("tel:") || url.startsWith("whatsapp:")) {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse(url));
                startActivity(intent);
                return true;
            }
            return false;
        }

Put this code in your mWebView.setWebViewClient(new WebViewClient(). it will be working perfectly for all link like tel:, whatsapp:, mailto: etc.

This Work For Me

"webview.setWebViewClient(new WebViewClient() { String currentUrl;

       @Override
       public boolean shouldOverrideUrlLoading(WebView view, String url) {
           currentUrl = url;

           if (url.startsWith("http") || url.startsWith("https")) {
               return false;
           }
           if (url.startsWith("intent")) {




             try {
                 Intent intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);

                 String fallbackUrl = intent.getStringExtra("browser_fallback_url");
               if (fallbackUrl != null) {
                   webview.loadUrl(fallbackUrl);
                   return true;
               }}

           catch (URISyntaxException e) {
               //not an intent uri
           }
   return true;//do nothing in other cases

mailto links will not get loaded in your webview.You have check for it like this in shouldOverrideUrlLoading and handle it with intent.

    public boolean shouldOverrideUrlLoading(WebView view, String url) {
    if (url.startsWith("mailto:")) {

        Intent share = new Intent(Intent.ACTION_SEND);
        share.setType("text/plain");
        share.putExtra(Intent.EXTRA_TEXT, message);
        startActivity(Intent.createChooser(share, "Title of the dialog the system will open"));
        view.reload();
        return true;
    }
  }

Similar question Android Webview ERR_UNKNOWN_URL_SCHEME Error

this is for internal web browser.

you can open url with external app (like Chrome) for resolve this.

use url_handler package for opening a url with external app.