Added in API level 26

Summary: Nested Classes | Inherited Constants | Fields | Methods | Inherited Methods

Dataset

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Kotlin |Java

public final class Dataset
extends Object implements Parcelable

java.lang.Object
↳	android.service.autofill.Dataset

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A Dataset object represents a group of fields (key / value pairs) used to autofill parts of a screen.

For more information about the role of datasets in the autofill workflow, read Build autofill services and the AutofillService documentation.

Basic usage

In its simplest form, a dataset contains one or more fields (comprised of an id, a value, and an optional filter regex); and one or more presentations for these fields (each field could have its own presentation, or use the default presentation associated with the whole dataset).

When an autofill service returns datasets in a FillResponse and the screen input is focused in a view that is present in at least one of these datasets, the Android System displays a UI containing the presentation of all datasets pairs that have that view's AutofillId. Then, when the user selects a dataset from the UI, all views in that dataset are autofilled.

If both the current Input Method and autofill service supports inline suggestions, the Dataset can be shown by the keyboard as a suggestion. To use this feature, the Dataset should contain an InlinePresentation representing how the inline suggestion UI will be rendered.

Fill Dialog UI

The fill dialog UI is a more conspicuous and efficient interface than dropdown UI. If autofill suggestions are available when the user clicks on a field that supports filling the dialog UI, Autofill will pop up a fill dialog. The dialog will take up a larger area to display the datasets, so it is easy for users to pay attention to the datasets and selecting a dataset. If the user focuses on the view before suggestions are available, will fall back to dropdown UI or inline suggestions.

Dataset authentication

In a more sophisticated form, the dataset values can be protected until the user authenticates the dataset—in that case, when a dataset is selected by the user, the Android System launches an intent set by the service to "unlock" the dataset.

For example, when a data set contains credit card information (such as number, expiration date, and verification code), you could provide a dataset presentation saying "Tap to authenticate". Then when the user taps that option, you would launch an activity asking the user to enter the credit card code, and if the user enters a valid code, you could then "unlock" the dataset.

You can also use authenticated datasets to offer an interactive UI for the user. For example, if the activity being autofilled is an account creation screen, you could use an authenticated dataset to automatically generate a random password for the user.

See Dataset.Builder#setAuthentication(IntentSender) for more details about the dataset authentication mechanism.

Filtering

The autofill UI automatically changes which values are shown based on value of the view anchoring it, following the rules below:

1. If the view's autofill value is not text or is empty, all datasets are shown.
2. Datasets that have a filter regex (set through Field.Builder#setFilter(Pattern) and Dataset.Builder#setField(AutofillId, Field)) and whose regex matches the view's text value converted to lower case are shown.
3. Datasets that do not require authentication, have a field value that is text and whose value starts with the lower case value of the view's text are shown.
4. All other datasets are hidden.

Note: If user enters four or more characters, all datasets will be hidden

Summary

Nested classes
class	Dataset.Builder A builder for Dataset objects.

Inherited constants

From interface android.os.Parcelable int CONTENTS_FILE_DESCRIPTOR Descriptor bit used with describeContents(): indicates that the Parcelable object's flattened representation includes a file descriptor. int PARCELABLE_WRITE_RETURN_VALUE Flag for use with writeToParcel(Parcel, int): the object being written is a return value, that is the result of a function such as "Parcelable someFunction()", "void someFunction(out Parcelable)", or "void someFunction(inout Parcelable)".

Fields
public static final Creator<Dataset>	CREATOR

Public methods
int	describeContents() Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
String	toString() Returns a string representation of the object.
void	writeToParcel(Parcel parcel, int flags) Flatten this object in to a Parcel.

Inherited methods
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. final void wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
From interface android.os.Parcelable abstract int describeContents() Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. abstract void writeToParcel(Parcel dest, int flags) Flatten this object in to a Parcel.

Fields

CREATOR

Added in API level 26

public static final Creator<Dataset> CREATOR

Public methods

describeContents

Added in API level 26

public int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of writeToParcel(android.os.Parcel, int), the return value of this method must include the CONTENTS_FILE_DESCRIPTOR bit.

Returns
int	a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either 0 or CONTENTS_FILE_DESCRIPTOR

toString

Added in API level 26

public String toString ()

Returns a string representation of the object.

Returns
String	a string representation of the object.

writeToParcel

Added in API level 26

public void writeToParcel (Parcel parcel, 
                int flags)

Flatten this object in to a Parcel.

Parameters
parcel	Parcel: The Parcel in which the object should be written. This value cannot be null.
flags	int: Additional flags about how the object should be written. May be 0 or Parcelable.PARCELABLE_WRITE_RETURN_VALUE. Value is either 0 or a combination of Parcelable.PARCELABLE_WRITE_RETURN_VALUE, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES