Accessing js variable from android MainActivity

Question

I want to access a webapp as a android app, for this what I have done is simply calling url of that webapp by using webview. Webapp contains one js variable, I want to access that variable into androids MainActivity, how can I access and assign value to js variable which is in different webapp by using android MainActivity. Following is my code snippet for MainActivity,

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mWebview = new WebView(this);

        mWebview.getSettings().setJavaScriptEnabled(true);
        mWebview.getSettings().setDatabaseEnabled(true);
        mWebview.getSettings().setLoadWithOverviewMode(true);

        mWebview.setScrollBarStyle(WebView.SCROLLBARS_INSIDE_OVERLAY);
        mWebview.setScrollbarFadingEnabled(false);
        mWebview.loadUrl("http://www.mywebapp.com");

        setContentView(mWebview);


    }

My main question is how to access and assign a value to js variable through androids MainActivity which is in different app/html?

this may help you stackoverflow.com/questions/11287820/…

Nouman Ch
– Nouman Ch

2017-11-23 11:55:16 +00:00
Commented Nov 23, 2017 at 11:55 — Nouman Ch
– Nouman Ch, Commented Nov 23, 2017 at 11:55

Pratik18 · Accepted Answer · 2017-11-23 12:14:10Z

3

     // Call method in js or html
 Android.getImageUrl("text");

    // add this line in main activity.    
     webView.addJavascriptInterface(new JavaScriptInterface(this), "Android");

    // js value get in this method.(add this method in activity)
    public class JavaScriptInterface {
                Context mContext;

                JavaScriptInterface(Context c) {
                    mContext = c;
                }

                @JavascriptInterface
                public void getImageUrl(String text) {
        // js value get here.
                    }
                }
            }

edited Nov 23, 2017 at 12:14

answered Nov 23, 2017 at 12:01

Pratik18

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3 Comments

Sonali Khaladkar Over a year ago

where should I implement getImageUrl(); method ?

Pratik18 Over a year ago

you can call this method in js or html

Sonali Khaladkar Over a year ago

Yes I will call it from js/html, but where is getImageUrl() method definition is implemented? In mainActivity or somewhere else? Should I have to implement it or not?? I am sorry asking very basic questions I am new to android.

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