Android Studio: Webview and Sessions Basics

Question

I have a webview that is working perfectly as follows:

    wv = (WebView) findViewById(R.id.wv);
    //Enable JavaScript
    wv.getSettings().setJavaScriptEnabled(true);
    wv.setFocusable(true);
    wv.setFocusableInTouchMode(true);
    //Set Render Priority To High
    wv.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
    wv.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
    wv.getSettings().setDomStorageEnabled(true);
    wv.getSettings().setDatabaseEnabled(true);
    wv.getSettings().setAppCacheEnabled(true);
    wv.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
    //Load Url
    wv.loadUrl("https://str8red.com/");

I then have the following code which runs when a button is clicked:

    button.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            final RequestQueue requestQueue = Volley.newRequestQueue(MainActivity.this);
            StringRequest stringRequest = new StringRequest(Request.Method.GET,"https://str8red.com/loggedincheck",

                    new Response.Listener<String>(){
                        @Override
                        public void onResponse(String response) {
                            textView.setText(response);
                            requestQueue.stop();
                        }
                    }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    textView.setText("Something went wrong");
                    error.printStackTrace();
                    requestQueue.stop();
                }
            });
            requestQueue.add(stringRequest);
        }
    });

The address simply returns a string of "True" or "False" depending if the user is logged into the webview. The good news is that it is returning a string but it is always returning False, even when I have logged in to my site using the webview. I know the address https://str8red.com/loggedincheck works as expected as it works both in a web browser and also in the iOS app.

I am assuming that when the button is clicked it is not using the the same webview and therefore has no idea if the user is logged in or not.

I have looked online for a solution but have come unstuck. Any help would be appreciated.

If you need any additional information please do not hesitate to ask.

Answer 1

Indeed it will be always return false, because there is no relation between your Volly code and your webView code, so the right way based on this answer, you have to use evaluateJavascript instead of volley, by passing your javaScript function you can know user case.

wv.evaluateJavascript("(function() { return 'this'; })();", new ValueCallback<String>() {
    @Override
    public void onReceiveValue(String s) {
        Log.d("LogName", s); // Prints: "this"

        //check for user case based on javaScriptFunction
    }
});