Android WebView err_unknown_url_scheme

Question

With the simple below code I can get my url loaded correctly, but, I get "ERR_UNKNOWN_URL_SCHEME" when trying to tap on html links that starts with mailto: whatsapp: and tg: (Telegram).

Anyone can help me to fix this please? Unfortunately I do not know Java at all :(

Thanks.

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

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());

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

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

Answer 1

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;     } 

Answer 2

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");
}}