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Mobile Design Pattern: SMS Form
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[[Category:Mobile Design Patterns]]
[[Category:Mobile Design Patterns]]
Latest revision as of 06:06, 16 April 2012
Mobile applications could offer to users the ability to send SMS messages directly from within the application. In order to offer this kind of functionality, a form for SMS composing is usually presented to the user, with characteristics that are easily recognizable.
SMS Forms integrated in a mobile application give to the user the possibility to send SMS messages without the need to leave the application and open the default SMS composer. Also, being integrated within the application, the SMS Form can be customized in order to offer to the user a richer or smoother user experience (e.g.: filling fields with pre-compiled data, allowing to send a SMS message to multiple recipients).
In order to offer the SMS sending functionality, the used technology must offer programmatic access to Messaging (to send the SMS message) and (optionally) to Contacts (in order to choose the recipient number from the phonebook). Depending on the used technology, this kind of access could or could not be available.
 Fallback option
When direct SMS sending from a mobile application is not possible because of technology limits, a fallback option is, when available, to open the default SMS editor. If possible, the SMS editor fields are pre-compiled with data passed from the mobile application, in order to provide a better user experience to the final user.
 Use when
The SMS Form Design Pattern is useful in all these situations where you want to allow users to compose and send SMS messages from within a mobile application. This can include scenarios like:
- Messaging applications
- Sending an application download link to a friend (the classical "Send to a friend" functionality), as shown in the following screenshot.
 Use how
 Design guidelines
SMS Forms are actually a common pattern for most mobile users, since SMS messaging is a functionality always present on mobile phones. For this reason, when adding a SMS Form to a mobile application, it is good practice to respect some common layout and usability guidelines that allow users to easily understand the various interface functionalities.
An SMS Form is typically composed of few, well distinguishable UI elements. These are:
- A single-line field for the receiver's phone number
- A button (typically placed near the phone number's field, or in the soft-keys' menu) to allow users to choose a phone number from the device's phonebook
- A multi-line field to allow users to type the message body
- A button to send the SMS
If the SMS sending is a core functionality of the application, it is also good practice to provide extra functionalities to the user, such as:
- saving an SMS draft, and the ability re-open and send saved drafts
- sending a single SMS message to multiple recipients, without the need to re-type the message for each number
 Technology how-to
In order to correctly implement the SMS Form design pattern, the used technology must allow the access to these device functionalities:
- SMS sending: this functionality is usually offered through some sort of Messaging API
- Access to phonebook: in order to choose a phone number of a stored contacts
Depending on the used technology, these functionalities are offered through different methods and APIs.
 Symbian C++
The following articles explain how to access stored Contacts, and how to send SMS messages from a Symbian C++ application:
The following articles explain how to access stored Contacts, and how to send SMS messages from a Python application:
 Java ME
The following articles explain how to access stored Contacts, and how to send SMS messages from a Java ME application:
 Flash Lite
The following articles explain how to access stored Contacts, and how to send SMS messages from a Flash Lite application, by using Platform Services:
If Platform Services are not available, the default SMS editor can be opened with pre-compiled data, as shown in this Nokia Developer Wiki article:
 Design tips
- Give to the user the ability to directly type the number in the number field, without requiring an extra click to access a separate view. If this feature is not natively supported by the used technology, check if it can be programmatically implemented.
- When possible, give to the user the ability to directly type the message in the message field, without requiring an extra click to access a separate view.
- Always support T9 functionality where available.
- Provide a clear notification about the sending status