Where does application development begin?

Question

Android

Good day, comrades!
Please feel free to share your experience.
I am studying the Android SDK, and in order to better assimilate knowledge, I want to write a simple application in parallel with the study, as I accumulate knowledge, I will change this very application. I have already decided on the theme of the application, but now the question arose. Where to start development? That is, what are the priorities set at the beginning of development? Should I start designing layouts correctly right away, or should I focus on the functions of the application first and deal with the beauty of the application screen at the end?

Answer 1

Depends on the size of the application, if it is small, you can immediately sketch the necessary Activities and the most necessary functionality, functionality and layouts are done in parallel
If something is more complicated:
which parts of the application should be responsible for what
2. Add prototypes of the graphical interface to the existing description (wireframe is enough)
3. Again, the development of components and the interface can be carried out in parallel, the main thing is that they are consistent

Answer 2

writing a mobile application, like any other software product, begins with a flowchart (crossed out) of the terms of reference!