Java get variable from another class in Android JavascriptInterface

Question

I have two class and I want to get 'JSI.var' in MainActivity. Firstly i getting "" empty value when i button clicked. So, no log. Secondly i getting document.getElementsByName('name')[4].src) value. So, there are document.getElementsByName('name')[4].src) in next logs. How i get another class in @JavascriptInterface method.

in onCreate() method in MainActivity

  webview.getSettings().setJavaScriptEnabled(true);
  webview.addJavascriptInterface(new JSI(), "HTMLOUT");
  bt1.setOnClickListener(new OnClickListener(){
        public void onClick(View v){        
            for(int i=0;i<5;i++){
             webview.loadUrl("javascript:window.HTMLOUT.processHTML(document.getElementsByName('name')["+i+"].src);");
             Log.i("CODE : ",JSI.var);
             //or
             String str = JSI.var;}
        }});

JSI class

import android.webkit.JavascriptInterface;

public class JSI
{
    static String var="";

 @JavascriptInterface
 public static void processHTML(String html)
{    
    var=html;
 }
 }

May be the problem is that the Log.i is executed before the javascript, try to put a delay before the Log, or Log in the processHTML method — Pablo Gallego Falcón
– Pablo Gallego Falcón, Commented Jan 22, 2015 at 10:08
if i put Log.i--->in processHTML(String html) method. Log works correctly. but i want to get 'var' and apply Log.i(var); in MainActivity — Taha Körkem
– Taha Körkem, Commented Jan 22, 2015 at 10:09

Pablo Gallego Falcón · Accepted Answer · 2015-01-22 10:15:07Z

1

Try this

static String var="";

public void onCreate() {
webview.getSettings().setJavaScriptEnabled(true);
webview.addJavascriptInterface(this, "HTMLOUT");
bt1.setOnClickListener(new OnClickListener(){
    public void onClick(View v){        
        for(int i=0;i<5;i++){
    webview.loadUrl("javascript:window.HTMLOUT.processHTML(document.getElementsByName('name')["+i+"].src);");
        }
    }
);
}

@JavascriptInterface
 public static void processHTML(String html){    
    var=html;
    Log.i("CODE : ",var);
 }

This way you have the value in your activity when the javascript is executed.

answered Jan 22, 2015 at 10:15

Pablo Gallego Falcón

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2 Comments

Taha Körkem Over a year ago

its worked but i want to get 'JSI.var' in MainActivity. Because i equal 'JSI.var' to String variable in MainActivity.

Pablo Gallego Falcón Over a year ago

But if you put all in the MainActivity, even the processHTML method, you get what you want.

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