If one wanted to create a large application where each activity was it's own  
apk   almost  like modules  or .dlls

1) How would you test to see if an .apk file is available  and/or installed  
(might be different I don't know) ?

2) Using the emulator how can you permanently install the .apk ?

3) Would this be beneficial for memory and speed performance or not ?

4) From 1.apk  how would you call 2.apk ?  (using Intent's)

Obviously based on these questions what is the best android book that deals 
explicitly with this ?


Thanks in advance


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