Looks nice. What framework/sdk did you use? How do you fetch data from Elgg: bundled web-services?

Using elgg web service. I start with this https://github.com/markharding/elgg-web-services-deprecated

@ Man Sang, that is great. Once I get off from work I will give Elgg Android App a try.
@ Ismayil Kharedinov, I had the same question in mind. Thanks for asking.

Man Sang, Will you be sharing the app code?

Yes, I will shared all code in the elgg web server. On the Android still too early, I just got it to work.

What are the pros and cons of a stand alone app vs. using a responsive web design, html5, etc?

Here's is a recent perspective on the pros and cons of HTML5 compared to native apps : 

"HTML5 On The Rise: No Longer Ahead Of Its Time"

http://techcrunch.com/2015/10/28/html5-on-the-rise-no-longer-ahead-of-its-time/

@Man Sang, The time_ago function is declared twice hence can give a new user an error

[01-Nov-2015 14:31:59 America/Detroit] PHP Fatal error:  Cannot redeclare time_ago() (previously declared in /public_html/mod/web_services/lib/news.php:2) in /public_html/mod/web_services/lib/core.php on line 439

1. mod/web_services/lib/news.php on  line 2

2. mod/web_services/lib/core.php on line 439

otherwise, everything looks great. I will test it and keep you updated.

@ Man Sang,

All these tests were done using the ElggRelease or version 1.8.19

When accessing the http://www.elggsiteurl.com/admin/administer_utilities/apiadmin

This error is shown on the admin section;
API Admin needs the Version Check plugin to check for updates and new releases

I Tried to Run the unit tests for the web services plugin through admin:utilities : Web Services Tests

Elgg Core Unit Tests shows this errors

Fail: mod/web_services/tests/user.php -> Bad TestSuite [mod/web_services/tests/user.php] with error [No runnable test cases in mod/web_services/tests/user.php]]
Fail: mod/web_services/tests/blog.php -> Bad TestSuite [mod/web_services/tests/blog.php] with error [No runnable test cases in [mod/web_services/tests/blog.php]]
Fail: mod/web_services/tests/group.php -> Bad TestSuite [mod/web_services/tests/group.php] with error [No runnable test cases in mod/web_services/tests/group.php]]
Fail: mod/web_services/tests/wire.php -> Bad TestSuite [mod/web_services/tests/wire.php] with error [No runnable test cases in [mod/web_services/tests/wire.php]]
Fail: mod/web_services/tests/file.php -> Bad TestSuite [mod/web_services/tests/file.php] with error [No runnable test cases in [mod/web_services/tests/file.php]]
Fail: mod/web_services/tests/core.php -> Bad TestSuite [mod/web_services/tests/core.php] with error [No runnable test cases in [mod/web_services/tests/core.php]]
Fail: mod/web_services/tests/messages.php -> Bad TestSuite [mod/web_services/tests/messages.php] with error [No runnable test cases in [mod/web_services/tests/messages.php]]
Fail: mod/web_services/tests/news.php -> Bad TestSuite [mod/web_services/tests/news.php] with error [No runnable test cases in [mod/web_services/tests/news.php]]

And when now accessing the Elgg Android app on Android smartphone, after using the correct Core URL and the public API Key generated through admin setting --> Utilities --> API Key Admin
Now the Core App is throwing this error: Method call failed the API Authentication

The app signs in the user and shows sign in Success but can not load anything due to Method call failed the API Authentication error

When i get time tomorrow after work, i will look at it more.

Thanks.

@ Man Sang, i know that in order to clear the Method call failed the API Authentication error, I will need an OAuth plugin, or some other sort of authentication handler. When i tried to use for example Justin Richer, OAuth 1.0. with your web service plugin, i realized your web service plugin has some conflict functions with OAuth 1.0  https://elgg.org/plugins/385119/releases/0.10.5 and even the elgg OAuth plugin https://github.com/Elgg/oauth_api  hence when the any of this two OAuth and oauth_api plugin are activated, the results is a  white page during plugin activation.

What time of OAuth plugin are you using with the web-service plugin?