Plugin-Phonegap android

/* pluginName.js */
/* start plugin Scope. */
(function(){
    var cordovaRef = window.PhoneGap || window.cordova || window.Cordova;

    function GAPlugin() { }

    GAPlugin.prototype.init = function(success, fail, period) {
        console.log("init....GAPlugin");
        return cordovaRef.exec(function(ss){alert("Call back success.."+ss)}, fail, 'GAPlugin', 'initGA', [period]);
    };

    if (cordovaRef && cordovaRef.addConstructor) {
        cordovaRef.addConstructor(init);
    }
    else {
        init();
    }

    function init () {
        if(!window.plugins) {
            window.plugins = {};
        }
        if(!window.plugins.gaPlugin) {
            window.plugins.gaPlugin = new GAPlugin();
        }
    }

    if (typeof module != 'undefined' && module.exports) {
        module.exports = new GAPlugin();
    }
})(); /* End plugin Scope. */


/* index.js */
document.addEventListener("deviceready", init, false);
var gaPlugin;
function init(){
        gaPlugin = window.plugins.gaPlugin;
        gaPlugin.init(nativePluginResultHandler, nativePluginErrorHandler, "swagat...");
}
function nativePluginResultHandler (result) {
    console.log('nativePluginResultHandler: '+result);
}
function nativePluginErrorHandler (error) {
    console.log('nativePluginErrorHandler: '+error);
}
/* End index Scope. */


/* Start GAPlugin.java Scope. */

/* import package_name */
public class GAPlugin extends CordovaPlugin {
        @Override
        public boolean execute(String action, JSONArray args, CallbackContext callback) {

             if (action.equals("initGA")) {
                try {   Toast.makeText(this.cordova.getActivity().getApplicationContext(), "swagat", 3000).show();
                        callback.success("initGA - id = " + args.getString(0));
                        return true;
                     } catch (final Exception e) {
                        callback.error(e.getMessage());
                     }
        return false;
        }
     }

/* End GAPlugin.java Scope. */


/* Start config.xml Scope. */
 <plugins>
        <plugin name="GAPlugin" value="package_name.GAPlugin"/>
 </plugins>
/* Endconfig.xml Scope. */