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An Android app for learning Japanese by keeping a journal.
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Latest commit 714136f Jul 9, 2019


Hibi 「日々」

An app for Android designed to aid your Japanese learning through keeping a journal.

Table of Contents


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  • Add entries at any date and time
  • Search for words through right from the editing screen without having to switch app
  • Save new words used in an entry
  • Tag entries (e.g. Holiday, Day Out, Birthday)
  • Add entries to books (e.g. Trip to Tokyo 2018, Trip to Shirakawa-go 2019)
  • Add locations to entries
  • Add images to entries
  • Search your entries based on date, content, location, tags or books
  • Daily reminder to add an entry
  • Ability to backup and restore your data
  • Dark theme and Light theme
  • Easily see entries made on this day last month, and in previous years, using the Throwback feature


Main Screen Main Screen Dark Add Entry
Main Screen Dark Theme Add entry
Search Jisho More Info Add New Words
Search Jisho More Info Add New Words
Add Tags Search Entries
Add Tags Search Entries

Tech and Architecture

Architecture Diagram

Hibi is written entirely in Kotlin and employs a single activity MVVM architecture pattern using AndroidX View Model components. The activity contains a single NavHostFragment, part of the AndroidX Navigation Components, which hosts all other fragments such as the MainScreenFragment. Each fragment observes data in a View Model which may retrieve data from various repositories and API services and properly format it for display. All business logic is handled in the View Models and fragments are kept as minimal as possible (only having code for setting up Observers, click listeners, etc...). Data is stored using a Room database and queries are provided in a DAO in the form of functions. Data is then retrieved asynchronously within repositories using Kotlin coroutines and LiveData. Kodein is used for dependency injection due to it's native support for Kotlin and it's ease of writing. API calls are made using Retrofit and then converted into Kotlin objects using Gson. Design inspired by Material Design and implemented using Material Components for Android.

Open Source Libraries Used


Used for logging

Apache 2 License


Used for dependency injection

MIT License


Used for API calls

Apache 2 License


Used for converting API responses into Kotlin objects

Apache 2 License

Android File Picker

Used for selecting file to restore from

Apache 2 License

M PLUS Rounded 1c Bold

Used as the icon font

Open Font License

Open Sans

Used throughout the application

Apache 2 License

Google Material Design Icons

Used throughout the application

Apache 2 License

Material Design Icons

Used throughout the application

SIL Open Font License 1.1


Used for image loading and caching



Thanks to for making the API used for searching up words.

Thanks to this gist for providing the basis of the sticky month headers.


Copyright 2019 Marc Donald

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.
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