appcomm.js

/**
 *   Application Communication Interface from JS to Native
 */

var AppCommControl = function() {
};

AppCommControl.prototype.addUser = function(args, successCallback, failureCallback) {
	 return PhoneGap.exec(    successCallback,    //Success callback from the plugin
	      failureCallback,     //Error callback from the plugin
	      'AppComm',  //Tell PhoneGap to run Plugin
	      'addUser',              //Tell plugin, which action we want to perform
	      args);        //Passing list of args to the plugin
};

AppCommControl.prototype.getUpdates = function(successCallback, failureCallback) {
	 return PhoneGap.exec(    successCallback,    //Success callback from the plugin
	      failureCallback,     //Error callback from the plugin
	      'AppComm',  //Tell PhoneGap to run Plugin
	      'getUpdates',              //Tell plugin, which action we want to perform
	      []);        //Passing list of args to the plugin
};

AppCommControl.prototype.hasUpdates = function(successCallback, failureCallback) {
	 return PhoneGap.exec(    successCallback,    //Success callback from the plugin
	      failureCallback,     //Error callback from the plugin
	      'AppComm',  //Tell PhoneGap to run Plugin
	      'hasUpdates',              //Tell plugin, which action we want to perform
	      []);        //Passing list of args to the plugin
};

AppCommControl.prototype.clearUpdates = function(successCallback, failureCallback) {
	 return PhoneGap.exec(    successCallback,    //Success callback from the plugin
	      failureCallback,     //Error callback from the plugin
	      'AppComm',  //Tell PhoneGap to run Plugin
	      'clearUpdates',              //Tell plugin, which action we want to perform
	      []);        //Passing list of args to the plugin
};

PhoneGap.addConstructor(function() {
        PhoneGap.addPlugin("appcomm", new AppCommControl());
});


	

plugin.xml

<?xml version="1.0" encoding="utf-8"?>
<plugins>
    <plugin name="App" value="com.phonegap.App"/>
    <plugin name="Geolocation" value="com.phonegap.GeoBroker"/>
    <plugin name="Device" value="com.phonegap.Device"/>
    <plugin name="Accelerometer" value="com.phonegap.AccelListener"/>
    <plugin name="Compass" value="com.phonegap.CompassListener"/>
    <plugin name="Media" value="com.phonegap.AudioHandler"/>
    <plugin name="Camera" value="com.phonegap.CameraLauncher"/>
    <plugin name="Contacts" value="com.phonegap.ContactManager"/>
    <plugin name="Crypto" value="com.phonegap.CryptoHandler"/>
    <plugin name="File" value="com.phonegap.FileUtils"/>
    <plugin name="Network Status" value="com.phonegap.NetworkManager"/>
    <plugin name="Notification" value="com.phonegap.Notification"/>
    <plugin name="Storage" value="com.phonegap.Storage"/>
    <plugin name="Temperature" value="com.phonegap.TempListener"/>
    <plugin name="FileTransfer" value="com.phonegap.FileTransfer"/>
    <plugin name="Capture" value="com.phonegap.Capture"/>
    
    <plugin name="Keyboard" value="com.dhavaln.mobile.android.plugin.KeyboardControl"/>
    <plugin name="AppComm"  value="com.dhavaln.mobile.android.plugin.AppCommControl"/>
    <plugin name="SyncThread"  value="com.dhavaln.mobile.android.plugin.SyncThread"/>
</plugins>

SyncThread.java

package com.dhavaln.mobile.android.plugin;

import java.util.Date;

import org.json.JSONArray;

import android.util.Log;

import com.phonegap.api.PhonegapActivity;
import com.phonegap.api.Plugin;
import com.phonegap.api.PluginResult;

public class SyncThread extends Plugin {

	public static final String ACTION_START = "start";

	private String syncCallBackId;
	private Thread t;
	private boolean stop;
	
	public SyncThread() {
	}

	@Override
	public void setContext(PhonegapActivity ctx) {
		super.setContext(ctx);
		this.syncCallBackId = null;
	}
	
	@Override
	public PluginResult execute(String action, JSONArray data, String callbackId) {
		Log.i("SyncThread", action + " Action called with callback id "
				+ callbackId );

		PluginResult.Status status = PluginResult.Status.INVALID_ACTION;
		String result = "Unsupported Operation: " + action;
		// either start or stop the listener...
		if (action.equals(ACTION_START)) {
			if (this.syncCallBackId != null) {
				return new PluginResult(PluginResult.Status.ERROR,
						"Thread already running.");
			}
			this.syncCallBackId = callbackId;
			PluginResult pluginResult = new PluginResult(
					PluginResult.Status.NO_RESULT);
			pluginResult.setKeepCallback(true);

			if (t == null) {
				t = new Thread() {
					@Override
					public void run() {
						while (!stop) {
							try {
								Thread.sleep(15000);
								Log.i("SyncThread",
										"ready to call javascript for sync " + new Date() + SyncThread.this.toString());
								initSync(true);
							} catch (Exception e) {
								e.printStackTrace();
							}
						}
					}
				};
				t.start();
			}

			return pluginResult;
		}

		return new PluginResult(status, result); // no valid action called
	}

	private void initSync(boolean keepCallback) {
		if (this.syncCallBackId != null) {
			PluginResult result = new PluginResult(PluginResult.Status.OK);
			result.setKeepCallback(keepCallback);
			this.success(result, this.syncCallBackId);
		}
	}

	@Override
	public void onDestroy() {
		stop = true;
		t.stop();
	}
}

syncthread.js

/**
 *  SyncThread JS Interface
 */

var SyncThread = function() {
};

SyncThread.prototype.start = function(successCallback, failureCallback) {
	return PhoneGap.exec(successCallback, failureCallback, 'SyncThread',
			'start', []);
};

PhoneGap.addConstructor(function() {
	PhoneGap.addPlugin("syncthread", new SyncThread());
});

test.html

<html>
<head>
<script type="application/javascript" src="lib/js/phonegap/phonegap.js"></script>
<script type="application/javascript" src="lib/js/plugins/android/appcomm.js"></script>
<script type="application/javascript" src="lib/js/plugins/android/syncthread.js"></script>
</head>
<body>
<script type="text/javascript">
document.addEventListener('deviceready', function() {
    window.plugins.syncthread.start(doSync);    
});

function doSync(){
   console.log("------> received native event to initiate the SYNC");
   window.plugins.appcomm.hasUpdates(function(updateStatus){
       if(updateStatus){
          
       }
   });
}
</script>
</body>
</html>