CODEWITHSUNDEEP
javascriptjavaandroidasynchronouswebview
WSD
WSD

Reputation: 3587

Android WebView Async Call to Java Function

I'm looking for a way to make async calls to Android's native code from JS

I have a Main Activity with the following code to make accessible native code to JS:

 webView.addJavascriptInterface(new BindingHelper(this), "Android");
 webView.loadUrl("file:///android_asset/www/index.html");

The BindingHelper Class contains something like this:

 @JavascriptInterface
    public void showToast(String toast) {
        Toast.makeText(theContext, toast, Toast.LENGTH_SHORT).show();
    }

 @JavascriptInterface
        public String SuperDuperComplexFunction () {
            //A function that will need some time to finish...
            return "{}";
        }

The previous Methods can be called from the Index.html linked JS as follows:

<script type="text/js">
  Android.showToast("Toast");
</script>

In that way the showToast() function is executed synchronously. What I need is to call the method SuperDuperComplexFunction(); in a aSync way (just like an AJAX Request), and when the method success take some action. Any ideas?

Upvotes: 2

Views: 2080

Answers (1)

FoamyGuy
FoamyGuy

Reputation: 46846

One option is to use an Http Server in java code and then make the AJAX call on localhost. That way the Javascript call would be the exact same as any other AJAX call, and since you control the Http Server you can just have it call your SuperDuperComplexFunction()

I've used NanoHttpd in the past for something kind of similar but not quite the same.

Upvotes: 1

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