android - Phonegap Cordova 2.2 plugin development, cannot communicate between Java and JavaScript -

i have been trying work past few hours now. have cordova 2.2.

i created new package called com.tester.newvideouri.

i have class called newvideouri in package following content

package com.tester.newvideouri;  import org.apache.cordova.api.callbackcontext; import org.apache.cordova.api.cordovaplugin; import org.json.jsonarray; import org.json.jsonexception;  /**  * class echoes string called javascript.  */ public class newvideouri extends cordovaplugin {     @override     public boolean execute(string action, jsonarray args, callbackcontext callbackcontext) throws jsonexception {         if (action.equals("echo")) {             string message = args.getstring(0);              this.echo(message, callbackcontext);             return true;         }         return false;     }      private void echo(string message, callbackcontext callbackcontext) {         system.out.println("success here , display it");         if (message != null && message.length() > 0) {              callbackcontext.success(message);         } else {             callbackcontext.error("expected 1 non-empty string argument.");         }     } } 

in config.xml added following line:

    <plugin name="echo" value="com.tester.newvideouri.newvideouri" /> 

in javascript file have following:

    function onload() {         document.addeventlistener("deviceready", ondeviceready, false);     }     window.ondeviceready = function() {                  window.echo = function(str, callback) {             alert('started');             cordova.exec(callback, function(err) {                 callback('nothing echo.');             }, "echo", "echo", [ str ]);             alert('the end');         };                   window.echo("echome", function(echovalue) {             alert(echovalue == "echome"); // should alert true.         });     } 

nothing happens when run code. can please tell me doing wrong?

write "echome" code function this:

function echome(){     window.echo("echome", function(echovalue){     alert(echovalue == "echome");     }); } 

and call function in html code this:

<a href="javascript:echome();">click here</a> 

try run it. working me. :)