dzaima/APL is implemented in Java and can be built as an Android app; steps in the readme here: https://github.com/dzaima/APL https://github.com/dzaima/APL and

dzaima/APL is implemented in Java and can be built as an Android app; steps in the readme here: https://github.com/dzaima/APL https://github.com/dzaima/APL and downloadable APK and screenshots here: https://github.com/dzaima/APL/tree/master/AndroidIDE https://github.com/dzaima/APL/tree/master/AndroidIDE (I think; I've never used it)