Android - evaluatejavascript for before api-level 19

Question

evaluatejavascript is available API-level 19 and later. It has a callback. I know that I can use loadUrl instead of evaluatejavascript for before API-level 19. But how can I handle return value from script? Is there a solution for this?

String script = "function(){ return "abc"}()";
mywebview.loadUrl(script);

Your code has wrong combination of quotes. You can use `JavascriptInterface` to return value from Javascript. — Vladyslav Matviienko, Jul 11 '17 at 07:34

score 0 · Answer 1 · answered Mar 09 '20 at 08:54

You can use WebView.addJavascriptInterface() for this. Then the JavaScript can use the interface to communicate back to your code.

Example code:

class JsObject {
    @JavascriptInterface
    public void returnValue(String value){
        Log.d("JsObject", "Got value [" + value + "]");
    }
}
mywebview.getSettings().setJavaScriptEnabled(true);
mywebview.addJavascriptInterface(new JsObject(), "injectedObject");
mywebview.loadUrl("javascript:function(){ injectedObject.returnValue('abc')}()");

Android - evaluatejavascript for before api-level 19

1 Answers1