How to create plugin in phonegap to run the application in background?

I have created plugin for background service (to run the application in background) in phonegap.

here is my java code for plugin:

public class BackgroundService extends Plugin {
    @Override
    public PluginResult execute(String action, JSONArray args, String callbackId)
    {
        PluginResult.Status status = PluginResult.Status.OK;
        String result = "";

        try {
            if (action.equals("onCreate")) {
                this.onCreate();
            }
            else if (action.equals("onBind")) {
                Intent intent = null;
                this.onBind(intent);
            }
            else if (action.equals("onDestroy")) {
                this.onDestroy();
            }
            else if (action.equals("onStart")) {
                Intent intent = null;
                this.onStart(intent,args.getInt(1));
            }
            else if (action.equals("onUnbind")) {
                Intent intent = null;
                this.onUnbind(intent);
            }
            return new PluginResult(status, result);
        } catch(JSONException e) {
            return new PluginResult(PluginResult.Status.JSON_EXCEPTION);
        }
    }
    public void onCreate() {

        // TODO Auto-generated method stub



        }
    public IBinder onBind(Intent intent) {

        // TODO Auto-generated method stub



        return null;

        }
    public void onDestroy() {

        // TODO Auto-generated method stub

        super.onDestroy();



        }
    public void onStart(Intent intent, int startId) {

        // TODO Auto-generated method stub

        //super.onStart(intent, startId);



        }
    public boolean onUnbind(Intent intent) {

        // TODO Auto-generated method stub



        }
    public void onPause()
    {
        super.webView.loadUrl("javascript:navigator.BackgroundService.onBackground();");
    }

    public void onResume()
    {
        super.webView.loadUrl("javascript:navigat