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Android-Fu
There are prerequisites for this session available at
http://lab.to/oscon2012
Please install the software if you want to follow the coding exercises.
Please grab some paper and a pen from the front!
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Android-Fu
Awesome apps for
Paris Buttfield-Addison, Chris Neugebauer, Jon Manning
Ice Cream Sandwich and beyond
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Android-Fu
Awesome apps for
Paris Buttfield-Addison, Chris Neugebauer, Jon Manning
and beyond
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Android-Fu
Awesome apps for
Paris Buttfield-Addison, Chris Neugebauer, Jon Manning
Jelly Bean and beyond
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Android-Fu
Awesome apps for
Paris Buttfield-Addison, Chris Neugebauer, Jon Manning
Jelly Bean and beyond
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Android-Fu
Awesome apps for
Paris Buttfield-Addison, Chris Neugebauer, Jon Manning
Jelly Bean and beyond
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Android-Fu
Awesome apps for
Paris Buttfield-Addison, Chris Neugebauer, Jon Manning
Jelly Bean and beyond
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Harnessing the power of turnips
as the future of synergistic
corporate infrastructure.
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What You’ll Learn
•Why mobile apps are different
•Designing a mobile user experience
•Android’s architecture
•Building an Android app
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Introduction
(us, Android, etc etc etc)
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Us.
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Us.
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Us.
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Us.
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We speak quickly.
Please ask us to slow down if you want!
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Android.
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It’s an operating system
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It’s an operating system
for phones.
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It’s an operating system
for tablet devices.
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The latest version
4.1 (“Jelly Bean”)
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This tutorial:
Designing Android Apps
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This tutorial:
Designing Android 4.0 Apps
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The Goal:
An Android App for OSCON
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Housekeeping
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Git!
We’ve got a git repo full of our example app!
git clone https://github.com/chrisjrn/oscon-2012-app.git
cd oscon-2012-app
git checkout talk_listing_start
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Let’s talk about humans.
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Humans are arrogant, lazy,
and easily bored.
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Humans are lazy.
They don’t want to work to get nice things.
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Humans are arrogant.
They’ll expect other people to anticipate what they want,
and give it to them the moment they want it.
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Humans are easily bored.
If something takes longer than a couple of seconds,
they’re not interested.
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Behold: your customer!
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We’re kind of exaggerating.
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Mobile Design
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Mobile computers are different
to desktop computers.
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Mobile apps are different to
other apps.
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Android is a Unix machine,
but don’t write Unix programs.
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Small screens.
Short attention spans.
Limited capacity.
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The Mouse Doesn’t Exist
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Direct Manipulation Rocks
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Scrolling with inertia!
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One of the things I was worried
about was the lack of a gesture
or shortcut for “page down one
screenful of text”.
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The iPhone’s inertia-like flick
scrolling seems to work really
well for this.
- John Gruber, 2007
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Direct manipulation rocks!
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Direct manipulation sucks!
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Direct manipulation sucks!
(for you)
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Crutch
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Virtual keyboards suck
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No tactile feedback.
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Individual keys are small.
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Keyboard entry
=
50% of the screen is gone
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Virtual keyboards rule
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Keyboards hide
when unnecessary.
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Keyboards change
when necessary.
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Typing still sucks.
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The user’s hand is a
solid object.
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Can tap these
while looking at
screen content
Can’t tap these
without covering
the screen
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Hands also hold the device.
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The screen is small.
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The human eye
can only see so much.
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Make every pixel count.
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Summary
Direct Manipulation
Keyboards
Orientation
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Android Principles
And how it’s not iOS
or GNOME
or the Web
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Android Principles
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•Enchant me
•Simplify my life
•Make me amazing
“Creative Vision”
http://developer.android.com/design/get-started/creative-vision.html
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We have no idea
what these mean.
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Our Creative Vision
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Do one thing
Do it well
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“One thing” can mean
“Some things”
(but each should be obvious)
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Make it easy to leave
Make it even easier to return
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“Our goal is to have people leave our website as quickly as
possible.”
http://www.google.com/about/company/philosophy/
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Being a great app
means
Being great with other apps
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Your app should provide
features to other apps
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If there’s a native experience,
provide it.
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If other apps provide
functionality, use it
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What does this mean?
Double rainbow? So intense?
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Android UI Paradigms
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Actions
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Do something
Do it well
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Do something
Make it obvious
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The Action Bar
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What are actions?
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FIT Scheme
Frequent
Important
Typical
http://developer.android.com/design/patterns/actionbar.html
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Frequent
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Important
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Typical
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What’s not in the action bar
•Jump To Top
•View my Profile
•Mute
•View Settings
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Action Bar Paradigms
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Menus aren’t gone
:(
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Frequent
Important
Typical
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Always
Sometimes
Never
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Action Bars
The most important
things go here
Split or single?
Overflow Menu: Always,
sometimes, or never?
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Navigation
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Where am I?
What can I do here?
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How did I get here?
Where can I go next?
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Navigation
with the action bar
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Tabs
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List navigation
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Lists
A thing
ALL of the things
SOME of the things
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Tabs
SOME of the things
SOME of the things SOME of the things
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“Back” vs. “Up”
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http://developer.android.com/design/patterns/navigation.html
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http://developer.android.com/design/patterns/navigation.html
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Graphic Design
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Text
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“layout and typography are
crisp and meaningful.”
http://developer.android.com/design/get-started/creative-vision.html
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Swiss
Design
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Icons
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Icons should be obvious.
If it’s not obvious, use text.
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When is it obvious?
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It’s obvious if
lots of other apps do it
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It’s obvious if
it’s obvious
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It’s obvious if
Google has an icon for it
http://developer.android.com/design/downloads/index.html
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An aside:
Heuristic Analysis
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0
25
50
75
100
0 5 10 15
Percentage of Usability Problems Found
Number of Evaluators
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Analyse your results.
Create findings.
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Text
Colours
Icons
In order of importance
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Summary
Think about design.
Please.
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Making an App
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We’re going to make
an OSCON app.
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We’ll go through the process
of conceptualising and
designing the interface.
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You’ll design some stuff!
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You’ll work with the
person next to you.
Say hello!
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Designing a Mobile App
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Our Process
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The tools you’ll need:
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The tools you’ll need:
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The tools you’ll need:
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The tools you’ll need:
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The tools you’ll need:
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The tools you’ll need:
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Start with an outline.
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Start with an outline.
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“I want to see what’s
happening at OSCON.”
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Outlines can be
iterated upon.
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Outlines can be
iterated upon.
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“I want to quickly see what’s
happening at OSCON.”
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Now start listing features.
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What are the three most
important features that this
app must have?
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What We Thought
See the details of a talk
See what talks are on
sometime
Update the schedule
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What We Thought
See the details of a talk
See what talks are on
sometime
Update the schedule
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What We Thought
Individual
session screen
See the details of a talk
See what talks are on
sometime
Update the schedule
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What We Thought
Individual
session screen
List of
sessions
See the details of a talk
See what talks are on
sometime
Update the schedule
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What We Thought
Individual
session screen
List of
sessions
List days of
conference
See the details of a talk
See what talks are on
sometime
Update the schedule
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What We Thought
Individual
session screen
List of
sessions
List days of
conference
Updating
should be
invisible
See the details of a talk
See what talks are on
sometime
Update the schedule
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Draw the screens needed for
the features you’ve chosen.
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OSCON 2012 Session
How to grow a better turnip
Turnips are a growing industry. Along
with node.js they represent one of the
biggest advances our field has ever
seen. We should learn how to build a
better turnip. This session teaches you
everything you need to know.
Bob Turnip
Tuesday, 9AM to 12:30PM
Portland 255
OSCON 2012 Days
Monday
Tuesday
Wednesday
Thursday
Friday
OSCON 2012 Timetable
9AM to 12:30PM 1:30PM to 5PM 5:30PM to 10PM
Dancing Through Life
How to Succeed in Business
Why no one mourns the Wicked
Brimstone and Treacle
Someone
Someone
Someone
Someone
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Never code before
designing.
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Side note:
API design is still
design.
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Code something and test it.
Now.
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Iterate.
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Coffee time
See you at 11:00am!
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Step 1
A static app
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Stage 1
Implement all of the screens of the app
Will always show the same data, no matter what we press
Will not be themed beyond the defaults
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We’ll give you most of the code.
Follow along with us.
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Three screens to make.
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What is an Android App?
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A loose collection of managed Java classes
Instructions telling Android how they all fit together
An Android app is:
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The Manifest
An XML file that describes the contents of the app to the
Android OS
More on that later.
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Activities
public void onCreate(Bundle foo)
{
doLol();
}
public void warble()
{
}
UI bits
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Rare
Startup
Shutdown
Frequent
Rare
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UI thread vs. background threads
Great and epic battle?
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http://developer.android.com/guide/practices/design/responsiveness.html
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“The developer of this app was lazy and
foolish, please check the Play Store for
something better!”
http://developer.android.com/guide/practices/design/responsiveness.html
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Keeping off the UI thread
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Views
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Image View
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Image View
Text View
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Image View
Text View
Button
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Image View
Text View
Scroll Pane
Button
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Image View
Text View
Scroll Pane
Button
Composite Layout
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Fragments
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Your New Master
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Introduced in 3.0,
Back-ported to 1.6.
It’s that important.
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Views with code
Views with a life cycle
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Activities
vs.
Fragments
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Activities
are expensive
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FRAGMENTS
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Fragments
Many at once.
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Talk Listings
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(We’re going to code now!)
git checkout talk_listing_start
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git checkout talk_listing_end
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Adding a second screen
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We need one activity to
launch another.
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Intents
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Intents
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OS-Level signals
Used to launch activities
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OS-Level signals
Used to launch other apps
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Schedule
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(We’re going to code now!)
git checkout schedule_start
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git checkout schedule_end
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Days List
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(We’re going to code now)
git checkout day_list_start
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git checkout day_list_end
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Finished (for now)!
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Finishing An App
Part 2
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YOU ARE HERE.
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Implementing “Up”
navigation
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(Coding goes here)
(git checkout navigation_start)
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git checkout navigation_end
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Backing it with data
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(Coding Exercise)
(git checkout data_start)
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git checkout data_end
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Adding tab navigation
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(Coding exercise)
git checkout tabs_start
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git checkout tabs_end
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Themeing the app
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Coding Exercise
(git checkout theme_start)
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git checkout theme_end
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The End?
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Problems!
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“It’s too slow!”
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a-ha!
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git checkout make_faster
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“I don’t know what’s on now.”
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From This
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To This...
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...Or This
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git checkout navigation_refresh
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“I want session reminders.”
“I want to tweet sessions.”
“I want abstracts from the website.”
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git checkout talk_listing_update
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Polish.
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git checkout themeing_finished
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Finished!
http://lab.to/oscon2012apk
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Bringing it together
(We have a point to make)
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Building apps
people want to use
Harder than you think.
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People do not like phones.
Because they’re generally unpleasant to use.
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Mobile users hate
being surprised.
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Dialog boxes suck.
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Dialog boxes suck.
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Dialog boxes suck.
Being modal also sucks.
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Dialog boxes suck.
Being modal also sucks.
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A similar problem:
deleting stuff
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What should happen?
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Option 1:
Do nothing
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Option 2:
Pop a dialog box!
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Option 3:
Quietly indicate.
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Be fast.
We mentioned this before.
http://lab.to/qQlVJW
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Pretend to
be fast.
(If you’re not fast!)
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Be responsive.
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Lag equals death.
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Most apps start uploading here
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Instagram starts uploading here
Most apps start uploading here
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Never drop data.
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Expose yourself.
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The device’s conditions change.
A lot.
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Things that can change:
Screen size
Speed of CPU / GPU
Available memory
Storage space
Network speed
Everything
✔
✔
✔
✔
✔
✔
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Minimise your views
Views are expensive!
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Minimise your views
Views are expensive!
MEMORY PROBLEM
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Think about first launch
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Think about first launch
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Your home activity
Straightforward, aesthetic, consistent.
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Think about the ecosystem
It’s more than just your app.
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It starts in the
Marketplace.
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*Slide stolen from Roman Nurik’s Google Developer Day 2010 presentation.
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*Slide stolen from Roman Nurik’s Google Developer Day 2010 presentation.
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Where am I?
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Where am I? What can I do?
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Where am I? What can I do?
What else can I do?
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Constant collaboration
between design and
development
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Style your app.
Never port it.
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Beware the Port
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Some iOS apps ported to
Android and look bad.
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Start development early.
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Mobile is the perfect storm
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Greatest Strength?
It runs on a whole bunch of devices.
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Biggest Weakness?
It runs on a whole bunch of devices.
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Thanks for coming!
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Important Things!
•Give us feedback
• http://spkr8.com/t/13641
• http://lab.to/oscon2012
•Office Hours: Android Development & Mobile UX
• 10:40am Wednesday, near the O’Reilly Expo Booth.
•Download the App!
• http://lab.to/oscon2012apk
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@thesecretlab