EmojiCompat


@AnyThread
class EmojiCompat


Main class to keep Android devices up to date with the newest emojis by adding EmojiSpans to a given CharSequence.

By default, EmojiCompat is initialized by EmojiCompatInitializer, which performs deferred font loading to avoid potential app startup delays. The default behavior is to load the font shortly after the first Activity resumes. EmojiCompatInitializer will configure EmojiCompat to use the system emoji font provider via DefaultEmojiCompatConfig and always creates a new background thread for font loading. EmojiCompat will only allow one instance to be initialized and any calls to init after the first one will have no effect. As a result, configuration options may not be provided when using EmojiCompatInitializer. To provide a custom configuration, disable EmojiCompatInitializer in the manifest with:
    <provider
        android:name="androidx.startup.InitializationProvider"
        android:authorities="${applicationId}.androidx-startup"
        android:exported="false"
        tools:node="merge">
        <meta-data android:name="androidx.emoji2.text.EmojiCompatInitializer"
                  tools:node="remove" />
    </provider>
When not using EmojiCompatInitializer, EmojiCompat must to be initialized manually using init. It is recommended to make the initialization as early as possible in your app, such as from onCreate. init is fast and may be called from the main thread on the path to displaying the first activity. However, loading the emoji font takes significant resources on a background thread, so it is suggested to use LOAD_STRATEGY_MANUAL in all manual configurations to defer font loading until after the first screen displays. Font loading may be started by calling load}. See the implementation EmojiCompatInitializer for ideas when building a manual configuration. After initialization the get function can be used to get the configured instance and the process function can be used to update a CharSequence with emoji EmojiSpans.
CharSequence processedSequence = EmojiCompat.get().process("some string")
During loading information about emojis is not available. Before the EmojiCompat instance has finished loading, calls to functions such as process will throw an exception. It is safe to call process when getLoadState returns LOAD_STATE_SUCCEEDED. To register a callback when loading completes use InitCallback.

Summary

Nested types

abstract class EmojiCompat.Config

Configuration class for EmojiCompat.

Interface to check if a given emoji exists on the system.

Listener class for the initialization of the EmojiCompat.

Interface to load emoji metadata.

Callback to inform EmojiCompat about the state of the metadata load.

Factory class that creates the EmojiSpans.

Constants

const String!
EDITOR_INFO_METAVERSION_KEY = "android.support.text.emoji.emojiCompat_metadataVersion"

Key in extras that represents the emoji metadata version used by the widget.

const String!
EDITOR_INFO_REPLACE_ALL_KEY = "android.support.text.emoji.emojiCompat_replaceAll"

Key in extras that represents setReplaceAll configuration parameter.

const Int

Result of getEmojiMatch that means the full codepoint sequence is not known to emojicompat, but at least one subsequence is an emoji that is known at this metadata level.

const Int

Result of getEmojiMatch that means this codepoint can be drawn by an EmojiSpan at this metadata level.

const Int

Result of getEmojiMatch that means no part of this codepoint sequence will ever generate an EmojiSpan at the requested metadata level.

const Int

EmojiCompat instance is constructed, however the initialization did not start yet.

const Int

An unrecoverable error occurred during initialization of EmojiCompat.

const Int

EmojiCompat is initializing.

const Int

EmojiCompat successfully initialized.

const Int

EmojiCompat will start loading metadata when init is called.

const Int

EmojiCompat will wait for load to be called by developer in order to start loading metadata.

const Int

Replace strategy to add EmojiSpans for all emoji that were found.

const Int

Replace strategy that uses the value given in EmojiCompat.Config.

const Int

Replace strategy to add EmojiSpans only for emoji that do not exist in the system.

Public functions

java-static EmojiCompat
get()

Return singleton EmojiCompat instance.

String

Returns signature for the currently loaded emoji assets.

Int
getEmojiEnd(charSequence: CharSequence, offset: @IntRange(from = 0) Int)

see getEmojiStart.

Int
getEmojiMatch(
    sequence: CharSequence,
    metadataVersion: @IntRange(from = 0) Int
)

Attempts to lookup the entire sequence at the specified metadata version and returns what the runtime match behavior would be.

Int
getEmojiStart(charSequence: CharSequence, offset: @IntRange(from = 0) Int)

Together with getEmojiEnd, if the character at offset is part of an emoji, returns the index range of that emoji, start index inclusively/end index exclusively so that charSequence.subSequence(start, end) will return that emoji.

Int

Returns loading state of the EmojiCompat instance.

java-static Boolean
handleDeleteSurroundingText(
    inputConnection: InputConnection,
    editable: Editable,
    beforeLength: @IntRange(from = 0) Int,
    afterLength: @IntRange(from = 0) Int,
    inCodePoints: Boolean
)

Handles deleteSurroundingText commands from InputConnection and tries to delete an EmojiSpan from an Editable.

java-static Boolean
handleOnKeyDown(editable: Editable, keyCode: Int, event: KeyEvent)

Handles onKeyDown commands from a KeyListener and if keyCode is one of KEYCODE_DEL or KEYCODE_FORWARD_DEL it tries to delete an EmojiSpan from an Editable.

Boolean

This function is deprecated.

use getEmojiMatch which returns more accurate lookup information.

Boolean
hasEmojiGlyph(
    sequence: CharSequence,
    metadataVersion: @IntRange(from = 0) Int
)

This function is deprecated.

use getEmojiMatch which returns more accurate lookup information.

java-static EmojiCompat

Initialize the singleton instance with a configuration.

java-static EmojiCompat?
init(context: Context)

Initialize the singleton instance with the default system-provided configuration.

java-static Boolean

Return true if EmojiCompat has been configured by a successful call to init.

Unit

When setMetadataLoadStrategy is set to LOAD_STRATEGY_MANUAL, this function starts loading the metadata.

CharSequence?
process(charSequence: CharSequence?)

Checks a given CharSequence for emojis, and adds EmojiSpans if any emojis are found.

CharSequence?
process(
    charSequence: CharSequence?,
    start: @IntRange(from = 0) Int,
    end: @IntRange(from = 0) Int
)

Checks a given CharSequence for emojis, and adds EmojiSpans if any emojis are found.

CharSequence?
process(
    charSequence: CharSequence?,
    start: @IntRange(from = 0) Int,
    end: @IntRange(from = 0) Int,
    maxEmojiCount: @IntRange(from = 0) Int
)

Checks a given CharSequence for emojis, and adds EmojiSpans if any emojis are found.

CharSequence?
process(
    charSequence: CharSequence?,
    start: @IntRange(from = 0) Int,
    end: @IntRange(from = 0) Int,
    maxEmojiCount: @IntRange(from = 0) Int,
    replaceStrategy: Int
)

Checks a given CharSequence for emojis, and adds EmojiSpans if any emojis are found.

Unit

Registers an initialization callback.

Unit
registerInitCallback(
    executor: Executor,
    initCallback: EmojiCompat.InitCallback
)

Registers an initialization callback.

Unit

Unregisters a callback that was added before.

Unit

Updates the EditorInfo attributes in order to communicate information to Keyboards.

Constants

EDITOR_INFO_METAVERSION_KEY

Added in 1.0.0
const val EDITOR_INFO_METAVERSION_KEY = "android.support.text.emoji.emojiCompat_metadataVersion": String!

Key in extras that represents the emoji metadata version used by the widget. The existence of the value means that the widget is using EmojiCompat.

If exists, the value for the key is an int and can be used to query EmojiCompat to see whether the widget has the ability to display a certain emoji using hasEmojiGlyph.

EDITOR_INFO_REPLACE_ALL_KEY

Added in 1.0.0
const val EDITOR_INFO_REPLACE_ALL_KEY = "android.support.text.emoji.emojiCompat_replaceAll": String!

Key in extras that represents setReplaceAll configuration parameter. The key is added only if EmojiCompat is used by the widget. If exists, the value is a boolean.

EMOJI_FALLBACK

Added in 1.1.0
const val EMOJI_FALLBACK = 2: Int

Result of getEmojiMatch that means the full codepoint sequence is not known to emojicompat, but at least one subsequence is an emoji that is known at this metadata level. Keyboards may decide that this emoji is not supported by the application when this result is returned, with no further processing. This return value implies: - EmojiCompat will decompose this ZWJ sequence into multiple glyphs when replaceAll=true - EmojiCompat MAY defer to platform when replaceAll=false - System emoji font may or may not support this emoji - This application MAY render this emoji This return value is only ever returned for ZWJ sequences. To understand this result consider when it may be returned for the multi-skin-tone handshake introduced in emoji 14.

    U+1FAF1 // unknown @ requested metadata level
    U+1F3FB // metadata level 1
    U+200D  // not displayed (ZWJ)
    U+1FAF2 // unknown @ requested metadata level
    U+1F3FD // metadata level 1
In this codepoint sequence, U+1F3FB and U+1F3FD are known from metadata level 1. When an application is using a metadata level that doesn't understand this ZWJ and provides REPLACE_STRATEGY_ALL true, the color emoji are matched and replaced with EmojiSpan. The system emoji font, even if it supports this ZWJ sequence, is never queried and the added EmojiSpans force fallback rendering for the ZWJ sequence. The glyph will only display correctly for this application if ALL of the following requirements are met: - REPLACE_STRATEGY_ALL is false - hasGlyph returns true for each emoji subsequence known at this metadata level - hasGlyph returns true for the full sequence Given this return value for the multi-skin-tone handshake above, if REPLACE_STRATEGY_ALL is false then the emoji will display if the entire emoji sequence is matched by hasGlyph because U+1F3FB and U+1F3FD are both in the system emoji font. Keyboards that wish to determine if the glyph will display correctly by the application in response to this return value should consider building an internal lookup for new ZWJ sequences instead of repeatedly calling hasGlyph for each emoji subsequence.

EMOJI_SUPPORTED

Added in 1.1.0
const val EMOJI_SUPPORTED = 1: Int

Result of getEmojiMatch that means this codepoint can be drawn by an EmojiSpan at this metadata level. No further checks are required by keyboards for this result. The emoji is always supported by this application. This return value implies: - EmojiCompat can draw this emoji - System emoji font may or may not support this emoji - This application WILL render this emoji This result implies that EmojiCompat can successfully display this emoji. The system emoji font is not checked by this method, and this result may be returned even if the platform also supports the emoji sequence. If the application passes REPLACE_STRATEGY_ALL of true, then an EmojiSpan will always be generated for this emoji. If the application passes REPLACE_STRATEGY_ALL of false, then an EmojiSpan will only be generated if hasGlyph returns false for this emoji.

EMOJI_UNSUPPORTED

Added in 1.1.0
const val EMOJI_UNSUPPORTED = 0: Int

Result of getEmojiMatch that means no part of this codepoint sequence will ever generate an EmojiSpan at the requested metadata level. This return value implies: - EmojiCompat will always defer to system emoji font - System emoji font may or may not support this emoji - This application MAY render this emoji This can be used by keyboards to learn that EmojiCompat does not support this codepoint sequence at this metadata version. The system emoji font is not checked by this method, and this result will be returned even if the system emoji font supports the emoji. This may happen if the application is using an older version of the emoji compat font than the system emoji font. Keyboards may optionally determine that the system emoji font will support the emoji, for example by building a internal lookup table or calling hasGlyph to query the system emoji font. Keyboards may use a lookup table to optimize this check, however they should be aware that OEMs may add or remove emoji from the system emoji font. Keyboards may finally decide: - If the system emoji font DOES NOT support the emoji, then the emoji IS NOT supported by this application. - If the system emoji font DOES support the emoji, then the emoji IS supported by this application. - If system emoji font is support is UNKNOWN, then assume the emoji IS NOT supported by this application.

LOAD_STATE_DEFAULT

Added in 1.0.0
const val LOAD_STATE_DEFAULT = 3: Int

EmojiCompat instance is constructed, however the initialization did not start yet.

See also
getLoadState

LOAD_STATE_FAILED

Added in 1.0.0
const val LOAD_STATE_FAILED = 2: Int

An unrecoverable error occurred during initialization of EmojiCompat. Calls to functions such as process will fail.

See also
getLoadState

LOAD_STATE_LOADING

Added in 1.0.0
const val LOAD_STATE_LOADING = 0: Int

EmojiCompat is initializing.

See also
getLoadState

LOAD_STATE_SUCCEEDED

Added in 1.0.0
const val LOAD_STATE_SUCCEEDED = 1: Int

EmojiCompat successfully initialized.

See also
getLoadState

LOAD_STRATEGY_DEFAULT

Added in 1.0.0
const val LOAD_STRATEGY_DEFAULT = 0: Int

EmojiCompat will start loading metadata when init is called.

LOAD_STRATEGY_MANUAL

Added in 1.0.0
const val LOAD_STRATEGY_MANUAL = 1: Int

EmojiCompat will wait for load to be called by developer in order to start loading metadata.

REPLACE_STRATEGY_ALL

Added in 1.0.0
const val REPLACE_STRATEGY_ALL = 1: Int

Replace strategy to add EmojiSpans for all emoji that were found.

See also
process

REPLACE_STRATEGY_DEFAULT

Added in 1.0.0
const val REPLACE_STRATEGY_DEFAULT = 0: Int

Replace strategy that uses the value given in EmojiCompat.Config.

See also
process

REPLACE_STRATEGY_NON_EXISTENT

Added in 1.0.0
const val REPLACE_STRATEGY_NON_EXISTENT = 2: Int

Replace strategy to add EmojiSpans only for emoji that do not exist in the system.

Public functions

get

Added in 1.0.0
java-static fun get(): EmojiCompat

Return singleton EmojiCompat instance. Should be called after init is called to initialize the singleton instance.

Returns
EmojiCompat

EmojiCompat instance

Throws
java.lang.IllegalStateException

if called before init

getAssetSignature

Added in 1.0.0
fun getAssetSignature(): String

Returns signature for the currently loaded emoji assets. The signature is a SHA that is constructed using emoji assets. Can be used to detect if currently loaded asset is different then previous executions. When used on devices running API 18 or below, returns empty string.

Throws
java.lang.IllegalStateException

if not initialized yet

getEmojiEnd

Added in 1.3.0
fun getEmojiEnd(charSequence: CharSequence, offset: @IntRange(from = 0) Int): Int

see getEmojiStart.

getEmojiMatch

Added in 1.1.0
fun getEmojiMatch(
    sequence: CharSequence,
    metadataVersion: @IntRange(from = 0) Int
): Int

Attempts to lookup the entire sequence at the specified metadata version and returns what the runtime match behavior would be. To be used by keyboards to show or hide emoji in response to specific metadata support.

Parameters
sequence: CharSequence

CharSequence representing an emoji

metadataVersion: @IntRange(from = 0) Int

the metada version to check against, should be greater than or equal to 0,

Returns
Int

A match result, or decomposes if replaceAll would cause partial subsequence matches.

getEmojiStart

Added in 1.3.0
fun getEmojiStart(charSequence: CharSequence, offset: @IntRange(from = 0) Int): Int

Together with getEmojiEnd, if the character at offset is part of an emoji, returns the index range of that emoji, start index inclusively/end index exclusively so that charSequence.subSequence(start, end) will return that emoji. E.g., getEmojiStart/End("AB😀", 1) will return (-1,-1) since 'B' is not part an emoji; getEmojiStart/End("AB😀", 3) will return [2,4), note that "😀" contains 2 Chars. Returns -1 otherwise.

Parameters
charSequence: CharSequence

the whole sequence

offset: @IntRange(from = 0) Int

index of the emoji to look up

Returns
Int

the start index inclusively/end index exclusively

getLoadState

Added in 1.0.0
fun getLoadState(): Int

Returns loading state of the EmojiCompat instance. When used on devices running API 18 or below always returns LOAD_STATE_SUCCEEDED.

handleDeleteSurroundingText

Added in 1.0.0
java-static fun handleDeleteSurroundingText(
    inputConnection: InputConnection,
    editable: Editable,
    beforeLength: @IntRange(from = 0) Int,
    afterLength: @IntRange(from = 0) Int,
    inCodePoints: Boolean
): Boolean

Handles deleteSurroundingText commands from InputConnection and tries to delete an EmojiSpan from an Editable. Returns true if an EmojiSpan is deleted.

If there is a selection where selection start is not equal to selection end, does not delete. When used on devices running API 18 or below, always returns false.
Parameters
inputConnection: InputConnection

InputConnection instance

editable: Editable

TextView.Editable instance

beforeLength: @IntRange(from = 0) Int

the number of characters before the cursor to be deleted

afterLength: @IntRange(from = 0) Int

the number of characters after the cursor to be deleted

inCodePoints: Boolean

true if length parameters are in codepoints

Returns
Boolean

true if an EmojiSpan is deleted

handleOnKeyDown

Added in 1.0.0
java-static fun handleOnKeyDown(editable: Editable, keyCode: Int, event: KeyEvent): Boolean

Handles onKeyDown commands from a KeyListener and if keyCode is one of KEYCODE_DEL or KEYCODE_FORWARD_DEL it tries to delete an EmojiSpan from an Editable. Returns true if an EmojiSpan is deleted with the characters it covers.

If there is a selection where selection start is not equal to selection end, does not delete. When used on devices running API 18 or below, always returns false.
Parameters
editable: Editable

Editable instance passed to onKeyDown

keyCode: Int

keyCode passed to onKeyDown

event: KeyEvent

KeyEvent passed to onKeyDown

Returns
Boolean

true if an EmojiSpan is deleted

hasEmojiGlyph

Added in 1.0.0
Deprecated in 1.1.0
fun hasEmojiGlyph(sequence: CharSequence): Boolean

Returns true if EmojiCompat is capable of rendering an emoji. When used on devices running API 18 or below, always returns false.

Parameters
sequence: CharSequence

CharSequence representing the emoji

Returns
Boolean

true if EmojiCompat can render given emoji, cannot be null

Throws
java.lang.IllegalStateException

if not initialized yet

hasEmojiGlyph

Added in 1.0.0
Deprecated in 1.1.0
fun hasEmojiGlyph(
    sequence: CharSequence,
    metadataVersion: @IntRange(from = 0) Int
): Boolean

Returns true if EmojiCompat is capable of rendering an emoji at the given metadata version. When used on devices running API 18 or below, always returns false.

Parameters
sequence: CharSequence

CharSequence representing the emoji

metadataVersion: @IntRange(from = 0) Int

the metadata version to check against, should be greater than or equal to 0,

Returns
Boolean

true if EmojiCompat can render given emoji, cannot be null

Throws
java.lang.IllegalStateException

if not initialized yet

init

Added in 1.0.0
java-static fun init(config: EmojiCompat.Config): EmojiCompat

Initialize the singleton instance with a configuration. When used on devices running API 18 or below, the singleton instance is immediately moved into LOAD_STATE_SUCCEEDED state without loading any metadata. When called for the first time, the library will create the singleton instance and any call after that will not create a new instance and return immediately.

init

Added in 1.0.0
java-static fun init(context: Context): EmojiCompat?

Initialize the singleton instance with the default system-provided configuration.

This is the recommended configuration for most applications. For more details see DefaultEmojiCompatConfig.

This call will use DefaultEmojiCompatConfig to lookup the default emoji font provider installed on the system and use that, if present. If there is no default font provider onthe system, this call will have no effect.

Note: EmojiCompat may only be initialized once, and will return the same instance afterwords.

Returns
EmojiCompat?

Default EmojiCompat for this device, or null if there is no provider on the system.

isConfigured

Added in 1.0.0
java-static fun isConfigured(): Boolean

Return true if EmojiCompat has been configured by a successful call to init. You can use this to check if get will return a valid EmojiCompat instance. This function does not check the getLoadState and will return true even if the font is still loading, or has failed to load.

Returns
Boolean

true if EmojiCompat has been successfully initialized.

load

Added in 1.0.0
fun load(): Unit

When setMetadataLoadStrategy is set to LOAD_STRATEGY_MANUAL, this function starts loading the metadata. Calling the function when setMetadataLoadStrategy is not set to LOAD_STRATEGY_MANUAL will throw an exception. The load will not start if:

process

Added in 1.0.0
fun process(charSequence: CharSequence?): CharSequence?

Checks a given CharSequence for emojis, and adds EmojiSpans if any emojis are found. When used on devices running API 18 or below, returns the given charSequence without processing it.

Parameters
charSequence: CharSequence?

CharSequence to add the EmojiSpans

Throws
java.lang.IllegalStateException

if not initialized yet

See also
process

process

Added in 1.0.0
fun process(
    charSequence: CharSequence?,
    start: @IntRange(from = 0) Int,
    end: @IntRange(from = 0) Int
): CharSequence?

Checks a given CharSequence for emojis, and adds EmojiSpans if any emojis are found.

  • If no emojis are found, charSequence given as the input is returned without any changes. i.e. charSequence is a String, and no emojis are found, the same String is returned.
  • If the given input is not a Spannable (such as String), and at least one emoji is found a new android.text.Spannable instance is returned.
  • If the given input is a Spannable, the same instance is returned.
When used on devices running API 18 or below, returns the given charSequence without processing it.
Parameters
charSequence: CharSequence?

CharSequence to add the EmojiSpans, cannot be null

start: @IntRange(from = 0) Int

start index in the charSequence to look for emojis, should be greater than or equal to 0, also less than or equal to charSequence.length()

end: @IntRange(from = 0) Int

end index in the charSequence to look for emojis, should be greater than or equal to start parameter, also less than or equal to charSequence.length()

Throws
java.lang.IllegalStateException

if not initialized yet

java.lang.IllegalArgumentException

in the following cases: start < 0, end < 0, end < start, start > charSequence.length(), end > charSequence.length()

process

Added in 1.0.0
fun process(
    charSequence: CharSequence?,
    start: @IntRange(from = 0) Int,
    end: @IntRange(from = 0) Int,
    maxEmojiCount: @IntRange(from = 0) Int
): CharSequence?

Checks a given CharSequence for emojis, and adds EmojiSpans if any emojis are found.

  • If no emojis are found, charSequence given as the input is returned without any changes. i.e. charSequence is a String, and no emojis are found, the same String is returned.
  • If the given input is not a Spannable (such as String), and at least one emoji is found a new android.text.Spannable instance is returned.
  • If the given input is a Spannable, the same instance is returned.
When used on devices running API 18 or below, returns the given charSequence without processing it.
Parameters
charSequence: CharSequence?

CharSequence to add the EmojiSpans, cannot be null

start: @IntRange(from = 0) Int

start index in the charSequence to look for emojis, should be greater than or equal to 0, also less than or equal to charSequence.length()

end: @IntRange(from = 0) Int

end index in the charSequence to look for emojis, should be greater than or equal to start parameter, also less than or equal to charSequence.length()

maxEmojiCount: @IntRange(from = 0) Int

maximum number of emojis in the charSequence, should be greater than or equal to 0

Throws
java.lang.IllegalStateException

if not initialized yet

java.lang.IllegalArgumentException

in the following cases: start < 0, end < 0, end < start, start > charSequence.length(), end > charSequence.length()maxEmojiCount < 0

process

Added in 1.0.0
fun process(
    charSequence: CharSequence?,
    start: @IntRange(from = 0) Int,
    end: @IntRange(from = 0) Int,
    maxEmojiCount: @IntRange(from = 0) Int,
    replaceStrategy: Int
): CharSequence?

Checks a given CharSequence for emojis, and adds EmojiSpans if any emojis are found.

  • If no emojis are found, charSequence given as the input is returned without any changes. i.e. charSequence is a String, and no emojis are found, the same String is returned.
  • If the given input is not a Spannable (such as String), and at least one emoji is found a new android.text.Spannable instance is returned.
  • If the given input is a Spannable, the same instance is returned.
When used on devices running API 18 or below, returns the given charSequence without processing it.
Parameters
charSequence: CharSequence?

CharSequence to add the EmojiSpans, cannot be null

start: @IntRange(from = 0) Int

start index in the charSequence to look for emojis, should be greater than or equal to 0, also less than or equal to charSequence.length()

end: @IntRange(from = 0) Int

end index in the charSequence to look for emojis, should be greater than or equal to start parameter, also less than or equal to charSequence.length()

maxEmojiCount: @IntRange(from = 0) Int

maximum number of emojis in the charSequence, should be greater than or equal to 0

replaceStrategy: Int

whether to replace all emoji with EmojiSpans, should be one of REPLACE_STRATEGY_DEFAULT, REPLACE_STRATEGY_NON_EXISTENT, REPLACE_STRATEGY_ALL

Throws
java.lang.IllegalStateException

if not initialized yet

java.lang.IllegalArgumentException

in the following cases: start < 0, end < 0, end < start, start > charSequence.length(), end > charSequence.length()maxEmojiCount < 0

registerInitCallback

Added in 1.0.0
fun registerInitCallback(initCallback: EmojiCompat.InitCallback): Unit

Registers an initialization callback. If the initialization is already completed by the time the listener is added, the callback functions are called immediately. Callbacks are called on the main looper.

When used on devices running API 18 or below, onInitialized is called without loading any metadata. In such cases onFailed is never called.
Parameters
initCallback: EmojiCompat.InitCallback

the initialization callback to register, cannot be null

registerInitCallback

Added in 1.5.0
fun registerInitCallback(
    executor: Executor,
    initCallback: EmojiCompat.InitCallback
): Unit

Registers an initialization callback. If the initialization is already completed by the time the listener is added, the callback functions are called immediately.

When used on devices running API 18 or below, onInitialized is called without loading any metadata. In such cases onFailed is never called.
Parameters
executor: Executor

executor to dispatch callback on

initCallback: EmojiCompat.InitCallback

the initialization callback to register, cannot be null

unregisterInitCallback

Added in 1.0.0
fun unregisterInitCallback(initCallback: EmojiCompat.InitCallback): Unit

Unregisters a callback that was added before.

Parameters
initCallback: EmojiCompat.InitCallback

the callback to be removed, cannot be null

updateEditorInfo

Added in 1.0.0
fun updateEditorInfo(outAttrs: EditorInfo): Unit

Updates the EditorInfo attributes in order to communicate information to Keyboards. When used on devices running API 18 or below, does not update EditorInfo attributes. This is called from EditText integrations that use EmojiEditTextHelper. Custom widgets that allow IME not subclassing EditText should call this method when creating an input connection. When EmojiCompat is not in LOAD_STATE_SUCCEEDED, this method has no effect. Calling this method on API levels below API 19 will have no effect, as EmojiCompat may never be configured. However, it is always safe to call, even on older API levels.

Parameters
outAttrs: EditorInfo

EditorInfo instance passed to onCreateInputConnection