If your notification includes an action to respond with text, such as to reply to an email, it should normally launch an activity on the handheld device. However, when your notification appears on an Android wearable, you can allow users to dictate a reply with voice input. You can also provide pre-defined text messages for the user to select.
When the user replies with voice or selects one of the available
messages, the system sends the message to your app on the connected handheld device.
The message is attached as an extra in the Intent
you specified
to be used for the notification action.
Note: When developing with the Android emulator, you must type text replies into the voice input field, so be sure you have enabled Hardware keyboard present in the AVD settings.
Define the Remote Input
To create an action that supports voice input, first create an instance of
RemoteInput
using the
RemoteInput.Builder
APIs.
The
RemoteInput.Builder
constructor takes a string that the system
will use as a key for the Intent
extra that carries the reply message
to your app on the handheld.
For example, here's how to create a new
RemoteInput
object that provides a custom
label for the voice input prompt:
// Key for the string that's delivered in the action's intent private static final String EXTRA_VOICE_REPLY = "extra_voice_reply"; String replyLabel = getResources().getString(R.string.reply_label); RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_VOICE_REPLY) .setLabel(replyLabel) .build();
Add Pre-defined Text Responses
In addition to allowing voice input, you can
provide up to five text responses that the user can select for quick replies. Call
setChoices()
and pass it a string array.
For example, you may define some responses in a resource array:
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="reply_choices"> <item>Yes</item> <item>No</item> <item>Maybe</item> </string-array> </resources>
Then, inflate the string array and add it to the
RemoteInput
:
String replyLabel = getResources().getString(R.string.reply_label); String[] replyChoices = getResources().getStringArray(R.array.reply_choices); RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_VOICE_REPLY) .setLabel(replyLabel) .setChoices(replyChoices) .build();
Receive Voice Input for the Primary Action
If "Reply" is your notification's primary action (defined by the setContentIntent()
method), then you should attach the
RemoteInput
to the main action using
addRemoteInputForContentIntent()
. For example:
// Create intent for reply action Intent replyIntent = new Intent(this, ReplyActivity.class); PendingIntent replyPendingIntent = PendingIntent.getActivity(this, 0, replyIntent, 0); // Build the notification NotificationCompat.Builder replyNotificationBuilder = new NotificationCompat.Builder(this) .setSmallIcon(R.drawable.ic_new_message) .setContentTitle("Message from Travis") .setContentText("I love key lime pie!") .setContentIntent(replyPendingIntent); // Create the remote input RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_VOICE_REPLY) .setLabel(replyLabel) .build(); // Add remote input to wearable options and apply to notification Notification replyNotification = new WearableNotificationOptions.Builder() .addRemoteInputForContentIntent(remoteInput) .build() .applyTo(replyNotificationBuilder) .build();
By using
addRemoteInputForContentIntent()
to add the
RemoteInput
object to the notification's primary action,
the button that normally appears as an "Open" action becomes the "Reply" action
and starts the voice input UI when users select it on Android Wear.
Receive Voice Input for a Secondary Action
If the "Reply" action is not your notification's primary action and you want to enable
voice input for a secondary action, add the
RemoteInput
to a new action button defined by an
Action
object.
You should instantiate the
WearableAction
with the
WearableAction.Builder()
constructor, which takes an icon and text label for the action button, plus the
PendingIntent
the system should use to invoke your app when the user selects the action. For example:
// Create the pending intent to fire when the user selects the action Intent replyIntent = new Intent(this, ReplyActivity.class); PendingIntent pendingReplyIntent = PendingIntent.getActivity(this, 0, replyIntent, 0); // Create the remote input RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_VOICE_REPLY) .setLabel(replyLabel) .build(); // Create the notification action WearableAction replyAction = new WearableAction.Builder(R.drawable.ic_message, "Reply", pendingIntent) .addRemoteInput(remoteInput) .build();
After you add the
RemoteInput
to the
Wearablection
, set the
WearableAction
on the
WearableNotifications.Builder
using
addAction()
.
For example:
// Create basic notification builder NotificationCompat.Builder replyNotificationBuilder = new NotificationCompat.Builder(this) .setContentTitle("New message"); // Create the notification action and add remote input WearableAction replyAction = new WearableAction.Builder(R.drawable.ic_message, "Reply", pendingIntent) .addRemoteInput(remoteInput) .build(); // Create wearable notification and add action Notification replyNotification = new WearableNotificationOptions.Builder() .addAction(replyAction) .build() .applyTo(replyNotificationBuilder) .build();
Now, when the user selects "Reply" from an Android wearable, the system prompts the user
for voice input (and shows the list of pre-defined replies, if provided).
Once the user completes a response, the system invokes
the Intent
attached to the action and adds the
EXTRA_VOICE_REPLY
extra (the string
you passed to the
RemoteInput.Builder
constructor)
with the user's message as the string value.
Obtaining the Voice Input as a String
To obtain the user's voice input, call
getResultsFromIntent()
,
passing in the "Reply" action's intent. This method returns
a Bundle
that represents the intent's extras. You can then query the
Bundle
to obtain the user's voice input string.
The following code shows a method that accepts an intent and returns the voice input string,
which is referenced by the EXTRA_VOICE_REPLY
key that is used in the previous examples:
/** * Obtain the intent that started this activity by calling * Activity.getIntent() and pass it into this method to * get the associated voice input string. */ private String getMessageText(Intent intent) { Bundle remoteInput = RemoteInput.getResultsFromIntent(intent); if (remoteInput != null) { return remoteInput.getString(Intent.EXTRA_VOICE_REPLY); } } return null; }