Question

Bear with me, as this is my first Android app. 🙂

Essentially, I would like the user to be able to extract some information (stored as an array) from a photo and save the array in persistent memory.

The app would have four screens (ABCD), that would be as follows:

A: User has three choices: take a picture with the camera, select one from memory, or view saved arrays that have already been made with the program.
B: Top half of the screen is a preview of the selected photo and bottom half is an area where the user can select variables.
C: User sees the resultant array, with the option to save it.
D: View saved arrays.

Essentially, I just want back/next buttons between each activity, with the state of the global array saved when you hit back/next. I’ve looked through dozens of examples on SO and the closest I’ve seen is:
A->B
A->C
with activities B and C returning some value to A.

Are there any examples like this out there that may help me? Ashamedly, I have been working on this for hours.

Thanks!

tl;dr:

I would like to have the activity flow A->B->C->D, with back/next buttons to go to each adjacent activity, including the ability to go A->D and D->A.

Answer 1

Any Android application you make can re-use activities made available from other applications. It seems like most of what you need has already been implemented by the Android team (that is, the default Camera preview Activity that pops up whenever you launch the default Camera application). Check out this tutorial for details on how to set this up in your application properly.

The tutorial also explains how to customize your own Camera preview Activity (although this might be a little harder if it is your first time writing an Android application).