How to create Great App

In 1971, David Parnas wrote the great paper, "On the criteria to be used decomposing the system into parts," and yet the problem of breaking down big projects into small parts that work well together remains a struggle in the industry. The ability to decompose a problem space and in turn, compose a solution is essential to our work. Things have gotten worse since 1971. With microservices, big data, and streaming systems, we're all going to be distributed systems engineers sooner or later. In distributed systems, effective decomposition has an even greater impact on the reliability, performance, and availability of our systems as it determines the frequency and weight of communication in the system. This talk speaks to the essential considerations for defining and evaluating boundaries and behaviors in large-scale distributed systems. It will touch on topics such as bulkhead design and architectural evolution.

Talk from VoxxedDays at Vilnus where i mainly focuced on performance tips.

Software

How to create great apps
or shortest way from Java Developer to
Mobile Developer

> 10M users
Ruby,
Golang,
Python,
Android, iOS
40 cities

> 600
members
Google
Supported
Meetups,
Hackathons
StudyJam

Me
- Working in Telecom company. Writing
awful C-like language and SQL queries.
- Dream big

Over 20K fans
40k Installs
19k messages
over 1k photos
1 failure (not really)

1.3Bn Smartphones shipped
64% of traffic comes from mobile

- No subscription fee
- I had a Samsung S2 phone
Go Android!
I’m the engineer.

Mobile Cloud Computing
with Android
Android Developer Nanodegree

Cool, i learned it.
Now i need to design my
app

3 Main Things
- Who is your user
- Where he use it
- When he use
Don’t be selfish, be part of ecosystem

One design to rule them all
- Design for multiple screens first
- Same user experience across all device
- Don’t be afraid to
change

GAPPS - gmail, calendar,
google maps etc...
http://www.pttrns.com/
http://androidniceties.tumblr.com/
https://developer.android.com/design/patterns/index.html
https://developer.android.com/design/material/index.html
Follow the path, Luke

84% of users find app store ratings important when considering
whether or not to download an app

Don't do work that you don't
need to do.
Don't allocate memory if you can
avoid it.

OutOfMemory - Bitmap memory usage
Image 1080X1920pixels, 124KB .png compressed
Bitmap size = Width * Height * depth(4 bytes) = 8 MB!!!!
Reduce the size before loading it to the memory.

OutOfMemory - Garbage collector
A large number of small allocations can also cause heap
fragmentation
10,000 references waiting to be collected by GC

OutOfMemory - Garbage collector
“To improve is to change; to be perfect is to change often.” – Winston Churchill

OutOfMemory - Garbage collector
Reuse of the same object
No short term temporary object for String

Memory overhead - Autoboxing
Object with just one int take 16 bytes at minimum
Object overhead (8 bytes ) + Overhead of dlmalloc(8 bytes) + data (n
bytes) = >16 bytes

Primitive Type vs Object
Integer (16 bytes) vs int(4 bytes)
Boolean(16 bytes) vs boolean(4 bytes)
or
bit-field(1 bit) //even better!

Enums vs Ints
Very simple - don’t use Enums
== + 1,112 bytes

Enums vs Ints
Final static variable + annotations = 128 bytes

- Release memory when your activity no longer visible
- Don’t hold direct references. Use WeakReference
- Use inner static classes
- Stop all your handlers, threads in onStop callback
Memory Leak

Serialization/Deserialization
Serialization Deserializati
on

Serialization/Deserialization
Advantage - It’s human readable. And it’s biggest weak point.
Memory overhead

Last words...
“An amazing journey starts outside of your comfort zone” - Liat Aaronson
2013 - Establishing Android Academy
2014 - Closing startup and joining Gett
2015 - Helping and Lecturing over the world

levinyon@gmail.com
https://plus.google.com/+YonatanLevin

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