A free program for Android, by Miles Leung.
Cangjie keyboard is a free and easy-to-use Chinese character input method app for the Android operating system. It is a combination of two input methods: Traditional Chinese and Simplified Chinese. You can select either one of them to input Chinese characters. The app provides a dictionary with a large number of characters.
In addition, it supports a variety of themes, including the standard theme, the Light and Dark themes, as well as the Custom theme. You can also set a theme that will allow you to change the color of the text box and the background of the keyboard.
Cangjie keyboard is a free and open-source app, which means that you can modify the code to make it work on your device. You can download the latest version from the Google Play Store.
