Alexa.KeypadController Interface
Implement the Alexa.KeypadController
interface in your Alexa skill so that users can voice-control onscreen navigation. You can voice-enable scrolling, directional pad (d-pad), selection of onscreen elements, and showing more details for elements that have focus. You can enable voice navigation on your smart TV home screens, for live TV providers, or for in streaming apps. For details about video skills, see Understand the Video Skill API.
For the list of languages that the Alexa.KeypadController
interface supports, see List of Alexa Interfaces and Supported Languages.
Utterances
The Alexa.KeypadController
interface uses the pre-built voice interaction model. After the customer says one of the following utterances, Alexa sends a corresponding directive to your skill.
The following examples show some customer utterances:
Alexa, scroll right.
Alexa, page down.
Alexa, go right.
Alexa, move down.
Alexa, select this.
Alexa, go back.
Alexa, choose this.
Alexa, show details.
Alexa, show info.
Alexa, see more information.
Scenarios
Consider the following scenarios where you might use Alexa.KeypadController
.
Voice-enable your home screen
If you're a manufacturer of a smart TV, you can use Alexa.KeypadController
to voice-enable the home screen. When the user views the list of apps that the TV supports, the user can use their voice to scroll right, left, up, or down, and to select the app of their choice. This scenario also uses the Alexa.PowerController
and Alexa.Launcher
interfaces. The following is an example of user utterances for this scenario:
Alexa, turn on the TV.
Alexa, scroll right.
Alexa, launch [app].
Voice-enable your channel guide
If you're a live TV provider, you can use Alexa.KeypadController
to voice-enable the channel guide. The user can use their voice to scroll up, down, right, or left through the guide, and to select a program. This scenario also uses the Alexa.PowerController
and Alexa.Launcher
interfaces. The following is an example of user utterances for this scenario:
Alexa, turn on [name of live TV provider].
Alexa, go to cable guide.
Alexa, scroll down.
Alexa, select this.
Alexa, go home.
Voice-enable your app
If you're an app developer, you might use Alexa.KeypadController
to voice-enable your app to let the user use their voice to scroll up, down, right, or left. The user can use voice to see more information about an onscreen element by opening the details page, and to navigate back to the previous screen. This scenario also uses the Alexa.Launcher
interface and the Alexa.RemoteVideoPlayer
interface to display comedies. The following is an example of user utterances for this scenario:
Alexa, launch [app].
Alexa, show me comedies.
Alexa, scroll right.
Alexa, show me details.
Alexa, go back.
Reportable properties
The Alexa.KeypadController
interface uses the keystroke
property as the primary property. You identify that you support the properties in your discovery response.
The following table shows the valid values for the keystroke
property.
Keystroke type | Keystroke values | Description |
---|---|---|
Directional pad (d-pad) |
UP , DOWN , LEFT , RIGHT , SELECT |
Move up, down, left, or right one unit or to the next onscreen element, or select the element or item that has focus. |
Scrolling | PAGE_UP , PAGE_DOWN , PAGE_LEFT , PAGE_RIGHT |
Scroll in the specified direction. |
Information | INFO , MORE |
Display more information about the onscreen element that has focus. For example, show content that's offscreen, or jump to a detail page. |
Back button | BACK |
Simulate the behavior of the back button on the remote control. For example, navigate back to the previous screen. |
Discovery
You describe endpoints that support Alexa.KeypadController
by using the standard discovery mechanism described in Alexa.Discovery
.
For the KeypadController
interface, include a keys
attribute and list the keystrokes that you support.
Discover response example
The following example shows a Discover.Response
message for a device that supports the Alexa.KeypadController
.
{
"event": {
"header": {
"namespace": "Alexa.Discovery",
"name": "Discover.Response",
"payloadVersion": "3",
"messageId": "a unique identifier, preferably a version 4 UUID"
},
"payload": {
"endpoints": [
{
"endpointId": "unique ID of the endpoint",
"manufacturerName": "<the manufacturer name of the endpoint>",
"description": "<a description that is shown in the Alexa app>",
"friendlyName": "<device name, displayed in the Alexa app>",
"displayCategories": ["TV"],
"cookie": {},
"capabilities": [
{
"type": "AlexaInterface",
"interface": "Alexa.KeypadController",
"version": "3",
"keys": [
"BACK",
"INFO", "MORE", "SELECT",
"UP", "DOWN", "LEFT", "RIGHT",
"PAGE_UP", "PAGE_DOWN", "PAGE_LEFT", "PAGE_RIGHT"
]
},
{
"type": "AlexaInterface",
"interface": "Alexa",
"version": "3"
}
]
}
]
}
}
}
Directives
SendKeystroke directive
Support the SendKeystroke
directive so that customers can scroll your content.
SendKeystroke directive example
The following example shows a SendKeystroke
directive that Alexa sends to your skill.
{
"directive": {
"header": {
"namespace": "Alexa.KeypadController",
"name": "SendKeystroke",
"messageId": "message id",
"correlationToken": "<an opaque correlation token>",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "<an OAuth2 bearer token>"
},
"endpointId": "endpoint ID",
"cookie": {}
},
"payload": {
"keystroke": "SELECT"
}
}
}
SendKeystroke directive payload
The following table shows the payload details for the SendKeystroke
directive.
Property | Description | Type |
---|---|---|
|
Keystroke requested by the user. |
String |
SendKeystroke response
If you handle a SendKeystroke
directive successfully, respond with an Alexa.Response
event. You can respond synchronously or asynchronously. If you respond asynchronously, include a correlation token and a scope with an authorization token.
The following example shows a SendKeystroke
response.
{
"event": {
"header": {
"namespace": "Alexa",
"name": "Response",
"messageId": "a unique identifier, preferably a version 4 UUID",
"correlationToken": "<an opaque correlation token>",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "<an OAuth2 bearer token>"
},
"endpointId": "endpoint ID"
},
"payload": {}
}
}
SendKeystroke directive error handling
If you can't handle a SendKeystroke
directive successfully, respond with an Alexa.ErrorResponse
event. Use the INVALID_VALUE
error type if the user requests a keystroke that your device doesn't support.