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Monthly Archives: August 2012

User Guidelines for OI WebIntents

Hi there,

This blog presents a summary of user interface for current OI WebIntents. Now the app supports both tablets and handsets.

This is the main page with an introduction section, a service registration section, a service invocation section and a link to home page of

There are five action items in the action bar: backward, forward, reload, goHome and applicaiton management.

When a new application is found, a notification message is shown. The user can enter into application management interface by click on the notification or the menu item.

There are three tabs in the Web application management interface: New Found, My App and Trash, each with its own menu items. The sign “+” here means add the checked Web apps in New Found tab to My App, while “-” means removing them to trash. Since in current version, the agent no longer marked visited applications and ignore them in future visits, I put a trash tab here for recycling instead of deleting unused applications forever.

When entering the simple share web page on and click on the share button, a chooser dialog appears (with or without web apps).

Now you can use Web application like Twitter or Android application like Gmail to complete your action.

When running the share sample app now, the chooser dialog appears in its own context now.

The interface for handsets is similar.

The biggest difference is displaying Web applications and their web intents. Still, in the intents detail interface, a user can make same menu operations as its parent. Since back button shows different results from in tablets, I added a navigation up support for the application icon to return to the home page.


GSoC 2012 Weekly Report on OI WebIntents Agent (Aug 14-Aug 20)

Hi there,

This is the last report for GSoC 2012.


Now OI WebIntents can do three major tasks as specified in the application proposal:

  1. Invoke both Web applications and Android Applications from a Web page
  2. Invoke both Web applications and Android Applications from an external Android application
  3. Web application management

Device Models

Now OI WebIntents can work well on both handsets and tablets with different screen design.

User Guidelines

Another blog post describe the user guidelines to use OI WebIntents Agent with screenshots.

Data Structure and Class Implementation

1. Main activities

There are two activity classes which are important for this part:

  • WebIntentsAgentActivity
  • WebAppManagementActivity

WebIntentsAgentActivity is the main activity for this application and launched when the app takes off.  It creates the navigation menu items and if necessary starts off the WebAppManagementActivity for Web application management.

2. Data Storage and Content Provider

Two classes are important for this part:

  • WebIntentsDatabase
  • WebIntentsProvider

Each database table is represented by an internal class of WebIntentsProvider with its column fields and  CONTENT_URI. For example, the database table ‘web_intents’ is represented by WebIntentsProvider.WebIntents.

3. Web page parsing, revising and loading

CustomWebView is a customized subclass of WebView for parsing, revising and loading a Web page. Its loadUrl() method has been overwritten to inject Javascript code for Web Intents support before loading a Web page. Generally, a Web page consists of a main frame and several sub frames or iframes.  Since the loading of iframes is counted as resources loading in Android Webkit, sub pages parsing and Javscript injection for them is placed in the shouldInterceptRequest() method of WebViewClient. The procedures are similar, using Jsoup to parse pages and inject Javascript support for Web Intents.

In the other hand, the native Java Code support for the injected Javascript code is implemented by an internal class of WebIntentsAgentActivity, i.e. WebIntentsAgentActivity.Navigator. It implements the interfaces which are used in the injected Javascript code.

4. Web application Registration

Since most available Web applications for Web Intents are implemented as Chrome Extensions. I modified four sample applications and included them in this application. They are:

  • Web Intents Debugger
  • Share Link to Twitter
  • Shorten with
  • Chromerly URL-shortener

As a result, a procedure (FileReaderThread) for registering and loading local applications was also developed. However, this application also support online app registration. now supports some online applications. Our project is applicable for the following online application:

They can be discovered by browsing the following Web pages:

5. Web application management

The following classes are important for this part:

  • WebAppManagementActivity
  • WebAppListFragment
  • WebIntentsByAppListFragment
  • WebIntentsByAppActivity

WebAppListFragment is for displaying a list of Web application and WebIntentsByAppListFragment shows web intents for a specific web application. For a tablet, both WebAppListFragment and WebIntentsByAppListFragment will be added into  WebAppManagementActivity. However, for a handset, WebAppListFragment is contained in WebAppManagementActivity while WebIntentsByAppListFragment is loaded into WebIntentsByAppActivity. The purpose is for supporting multiple screens.

6. Invoke Web applications from external Android apps

A helper class named WebIntentsHelper is for this requirement. Any external Android application can invoke Web applications by the following step:

Install OI WebIntents Agent -> Import webintents-helper.jar into libs -> Create a application chooser by invoke WebIntentsHelper.createChooserWithWebActivities()

This method will create a chooser dialog in the context of the calling application now.

Use Cases

It is a pity that OI WenIntents now only support the and action. More action supports will be added in the future.

Failure method to report

We was trying to use Javascript and it events to support Web Intents directly. However, it seems not to work on Android. The Javascript event DOMContentLoaded or load can not be triggered in time in our early experiments and this cost us some time. The feature of slow network connection of mobile devices dooms direction of Javascript support on Android.


GSoC 2012 Weekly Report on OI WebIntents Agent (Aug 6-Aug 13)

Hi there,

Last week I designed a new logo for OI WebIntents Agent together with Friedger, as in Fig 1.

Fig 1. OI WebIntents logo

It will appear in the following versions.

In the former versions, the external Android application which calls the createChooserWithWebActivities method will let the system start an empty Activity which creates a dialog for application selection. Now the dialog will be created in the context of the activity which calls the method, as in Fig 2.

Fig 2. Application chooser dialog

The dialog layout is created from Java code and I tried to use Android internal layout resources, so now the invoking methods is still the same as the former version.

Now when new applications are found, a notification message on the status bar will appear. It may refer the user to the application management UI directly, like in Fig 3.

Fig 3. New application found notification

For the application management UI, the selection mode is enabled when the user enters the activity. I also added checkboxes for item selection instead of the former long click action, as in Fig 4.

Fig 4 New application management UI

Last week, I also added handset supports. Now the application management UI also looks better on small screen devices, like in Fig 5 and 6.

Fig 5. Web Application list

Fig 6. Web Intents by application

This week is the last week before hard ‘pencil down’. A lot of document work and revisions are waiting for me so it will be very busy.

Any feedback is welcome.


GSoC 2012 Weekly Report on OI WebIntents Agent (July 30-Aug 5)

Hi there,

Happy Civic Day!

This week I added some comments to the code. Hope that they are helpful. If any part of the code is obscure to you, please leave a message and I will add more comments specific for you.

It’s a pleasure that  made some online services available besides those in Chrome. Now when you use our app to browse some online pages you can find new applications from them. Those applications include Kinlan’s Image Share, Kinlan’s Link Share and Kinlan’s Link Shortener. Up to now, our app is totally compatible with these apps except a small flaw for image sharing. But this problem also exists when you use Android’s default browser so I think it might be generic to Android Webkit.

Now the app is working better on tablet with large screens.  Next step I will test it on normal devices like phones and add necessary revisions.

Since the pencil down date is approaching, I have many small function revisions to make in the next few days and I think it must be very busy.

Work done last week

  1. Add online service registration
  2. Add an address bar
  3. Format the code according to openintents developer’s code style instructions like use tab instead of spaces for indentation