public class DemoApplication extends Application {
    @Override
    public void onCreate() {
        FaceGroup programmerGroup = new FaceGroup();
        // The number of emojis displayed per row on the **More emojis** input UI
        programmerGroup.setPageColumnCount(5);
        // The thumbnail of the sticker
        programmerGroup.setFaceGroupIconUrl("file:///android_asset/programmer/programmer00@2x.png");
        // The name of the sticker
        programmerGroup.setGroupName("programmer");
        for (int i = 0; i < 16; i++) {
            CustomFace customFace = new CustomFace();
            String index = "" + i;
            if (i < 10) {
                index = "0" + i;
            }
            // Put emojis in the `assets` directory. If the sandbox path or network path is used, the `setFaceUrl` method can be used.
            customFace.setAssetPath("programmer/programmer" + index + "@2x.png");
            // The `key` of the emoji
            String faceKey = "programmer" + index;
            customFace.setFaceKey(faceKey);
            // The width of the emoji on the **More emojis** input UI
            customFace.setWidth(170);
            // The height of the emoji on the **More emojis** input UI
            customFace.setHeight(170);
            programmerGroup.addFace(faceKey, customFace);
        }
        // Register the sticker in `FaceManager`. `FaceGroupID` is `1`.
        FaceManager.addFaceGroup(1, programmerGroup);
    }
}

V2TIMMessage v2TIMMessage = V2TIMManager.getMessageManager()
        .createFaceMessage(faceGroupID, faceKey.getBytes());
V2TIMManager.getMessageManager().sendMessage(v2TIMMessage,
        userID,
        null,
        V2TIMMessage.V2TIM_PRIORITY_DEFAULT,
        false,
        null,
        new V2TIMSendCallback<V2TIMMessage>() {...}

TUIMessageBean messageBean = ChatMessageParser.parseMessage(v2TIMMessage);
FaceMessageBean faceMessageBean = null;
if (messageBean instanceof FaceMessageBean) {
    faceMessageBean = (FaceMessageBean) messageBean;
}
if (faceMessageBean != null) {
    int faceGroupID = faceMessageBean.getIndex();
    String faceKey = null;
    if (faceMessageBean.getData() != null) {
        faceKey = new String(faceMessageBean.getData());
    }
}

FaceManager.loadFace(faceGroupID, faceKey, imageView);

String faceUrl = "";
List<FaceGroup> faceGroupList = FaceManager.getFaceGroupList();
for(FaceGroup faceGroup : faceGroupList) {
    if (faceGroup.getGroupID() == faceGroupID) {
        ChatFace face = faceGroup.getFace(faceKey);
        if (face != null) {
            faceUrl = face.getFaceUrl();
        }
    }
}

// load faceUrl into view