A Pirate's Guidelines for Android

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Android Development The Pirate's CODE

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Android Development The Pirate's Guidelines

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Where did these come from?

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Where did these come from? How Do I Start An Android App?

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How Do I Start An Android App?

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How do I map these mock ups to Android 'Pieces'?

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Pirate Guideline #1

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Pirate Guideline #1 There is a one to one correspondence between a wireframe screen and an Activity

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Super easy to get started writing a new application

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OkayActivity.java setContentView(R.layout.activity_generic.xml); SuccessActivity.java setContentView(R.layout.activity_generic.xml);

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luke: hey lisa! !

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luke: hey lisa! ! lisa: hey! !!

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luke: the app's looking really great! !!

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luke: the app's looking really great! !! lisa: /me blushes ☺️

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luke: just one thing

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luke: just one thing luke: *explains how someone could get stuck*

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luke: we need a logout button

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lisa: /me prepares diatribe on the Android Back Button

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lisa: /me realizes she is vastly outnumbered by iOS devices

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lisa: /me ctrl-C; ctrl-V

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OkayActivity.java setContentView(R.layout.activity_generic.xml); SuccessActivity.java setContentView(R.layout.activity_slightly_less_generic.xml);

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Pirate Guideline #2

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Pirate Guideline #2 Every Activity has its own layout ﬁle

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PRGRAMMING BSET PRACTICES PRINCIPAL 101

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PRGRAMMING BSET PRACTICES PRINCIPAL 101 DRY: Don't Repeat Yourself

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Pirate Guideline #3

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Pirate Guideline #3 Reusable View code belongs in a View class

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PRGRAMMING BSET PRACTICES PRINCIPAL 101

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PRGRAMMING BSET PRACTICES PRINCIPAL 101 Favor composition over inheritance

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Pirate Guideline #3A Reusable View attributes belong in a style

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!""""

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Pirate Guideline #4

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Pirate Guideline #4 Fragments are not simple. Don't use fragments.*

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Pirate Guideline #4 Fragments are not simple. Don't use fragments.* *unless it is absolutely necessary

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@Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); }

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@Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); \\ ~~something real hacky~~ }

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—languages not changing correctly

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—languages not changing correctly —views not resizing properly

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—languages not changing correctly —views not resizing properly —strange invocations to .onSaveInstanceState() in onConfigurationChanged

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—BUGGY —HARD TO TEST —HARD TO FIX

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Pirate Guideline #5

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Pirate Guideline #5 Never override conﬁguration changed.*

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Pirate Guideline #5 Never override conﬁguration changed.* * for view code

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setRetainState(true);

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setRetainState(true); How well do you really know the Activity Lifecycle?

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@Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // save my state! }

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Pirate Guideline #6 Retain nothing but state*

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Pirate Guideline #6 Retain nothing but state* *and hardware adapters

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CAVEAT:

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CAVEAT: headless fragments

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Pirate Guideline #7

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Pirate Guideline #7 Embrace state machines

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A State Machine —States are explicitly deﬁned —Can only do certain things in each state —Where you can go next depends on where you are now

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Android Development A Pirate's Guidelines

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—There is a one to one correspondence between a wireframe screen and an Activity —Every Activity has its own layout ﬁle —Reusable View code belongs in a View class —Fragments are not simple. Don't use fragments.* —Never override conﬁguration changed* —Retain nothing but state* —Embrace state machines