Pass JavaScript Value from Webview to Activity?Android

Question

I followed this to Print in android (Thermal Printer)

This is My web-view Over there On-click It will Load My Android Activity Which is Out of Web-view...

For that I have Given this... to Open new activity from web-view..

public class Main_web extends AppCompatActivity {

private WebView webView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_m);

    webView = (WebView) findViewById(R.id.webm);

    WebSettings set = webView.getSettings();
    set.setJavaScriptEnabled(true);
    webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
    final AlertDialog alertDialog = new AlertDialog.Builder(this).create();
    final ProgressDialog progressBar = ProgressDialog.show(Main_web.this, "Please Wait", "Loading...");

    webView.addJavascriptInterface(new WebAppInterface(this), "NewFUN");
    webView.requestFocusFromTouch();
    webView.setWebViewClient(new WebViewClient()

    {

        public void onPageFinished(WebView view, String url) {

            if (progressBar.isShowing()) {
                progressBar.dismiss();
            }
        }

    });

    webView.setWebChromeClient(new WebChromeClient());

    String url = "www.google.com/m_app_eta.php";
    //String url = "file:///android_asset/tex.html";
    try {

        if (URLUtil.isValidUrl(url)) {
            webView.loadUrl(url);

        } else {
          //do something
        }
    } catch (Exception e) {
         //do something

    }

}

//Class to be injected in Web page

public class WebAppInterface {

    Context mContext;
    WebAppInterface(Context c) {
        mContext = c;
    }

    @JavascriptInterface
    public void Print() {

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
        alertDialog.setTitle("Alert");
        alertDialog.setMessage("Are you sure you want to leave to next screen?");
        alertDialog.setPositiveButton("YES",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent chnIntent = new Intent(Main_web.this, Print_activity.class);
                        startActivity(chnIntent);
                    }
                });
        alertDialog.setNegativeButton("NO",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });

        alertDialog.show();
    }

}
}

Now My printer Activity is working Fine So here I want to pass a Value On click Button Which Opens Printer... But can Any one suggest me How to Receive same value in android Activity not in web-view...

All I need is In my web-view when I click on the Button its loading Android Activity Along with that I want to Pass A string value to new Activity

Why Should I pass Value means In that I have a Url so I can Print with that URL Here JS value is different form current URL

Update

I followed this But its Inside the Web-view I want same at Outside the web-view...

Means When I click on the web-view Its opening android activity with the same its should pass a value to my activity not the web-view

Update 1

I followed @Sujal Mandal answer But I dont Know How to use that Value In next activity Can any one suggest me... on this kind... in next activity It may in System.out.println or text-view or any other string So I can use can Any one suggest How to Use the JavaScript Value in other activity outside the web-view..

Don't Be negative · Accepted Answer · 2017-03-09 11:52:49Z

1

HTML JS CODE

<script type="text/javascript">
function Pa(value) {
       //value is the param received from onClick
       NewFUN.Print(value); //call the android method with value param
    }
</script>

<center>
    <h3>Sample HTML</h3>
    <div id="content">Click on Button To thermal print</div>
    <div>
        <input type="button" onClick="Pa('26997')" /><br/>
        </div>
</center>

& change your android code to be like this

@JavascriptInterface
    public void Print(final String stringFromWebView) {
        //use stringFromWebView
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
        alertDialog.setTitle("Alert");
        alertDialog.setMessage("Are you sure you want to leave to next screen?");
        alertDialog.setPositiveButton("YES",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent chnIntent = new Intent(Main_web.this, Print_activity.class);
                        chnIntent.putExtra("STRING_DATA", stringFromWebView);
                        startActivity(chnIntent);
                    }
                });
        alertDialog.setNegativeButton("NO",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });
        alertDialog.show();
    }

In next activity receive the web JS response by using

String data = getIntent().getStringExtra("STRING_DATA");

at oncreate

edited Mar 9, 2017 at 11:52

Don't Be negative

1,2153 gold badges20 silver badges46 bronze badges

answered Mar 9, 2017 at 5:01

Sujal Mandal

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7 Comments

Don't Be negative Over a year ago

This is fine But its not working... If I give this public void Print() Its Opening new Activity... But If I give this public void Print(String stringFromWebView) its not working Because.. I have Given this in JS function Pa(value) { NewFUN.Print(); } SO here what ever its there it will work NewFUN.Print(); ,NewFUN.Splash();.. but its not working when I give NewFUN.Print(String stringFromWebView);

Don't Be negative Over a year ago

Thanks for Responce @Sujal Mandal

Sujal Mandal Over a year ago

NewFUN.Print('string') try this, why would you pass a variable declaration as a parameter anyway?

Sujal Mandal Over a year ago

alternatively if you have a variable in js just pass the variable in the method it should work, e.g var valToSend="string stringer"; NewFUN.Print(valToSend);

Don't Be negative Over a year ago

Sorry I am not getting SO asked can you update your code

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