android development - part 1

8/10/2019 Android Development - Part 1

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Introduction to

Android Developmen

Part 1

So, you wanna build an app?

Online Seminar

Konrad Grski

JLC Gdask


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Konrad Grski

JLC Gdask

Co-creator of Split It!

Whos this guy?

fb.com/konradg

twitter.com/kon

C


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Whats the plan?

Introduction

The System

The Tools

The A

2x 4


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Why Android?

Popularity

Availability

Community support


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Introduction

The Tools

The A

The System


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What is Android?

Linux kernel

Runtime(Dalvik VM + libraries:

WebKit, Media, SQLite etc.)

End-user apps

An OS A framew

API for dev

Android ecoGoogle Ser


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What is Android?


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Androids not one device

Platform versions

Screen sizes

Vendor add-ons

CPU architectures

ITSA


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Fragmentation

http://developer.android.com/about/dashboards/index.html

API 9-10API 14-15

API 16-18

API 19
http://developer.android.com/about/dashboards/index.html


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The A

Introduction

The System

The Tools


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Getting started

Google android sdk developer.android.com/sdk/

Download & unpack theADT Bundle

Run eclipse
http://developer.android.com/sdk/http://developer.android.com/sdk/http://developer.android.com/sdk/


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Whats inside?

Eclipse - the IDE

Android SDK

System image (for emulator)

Emulator instance


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Physical device Fast, compatible

Hardware features

Emulator

Different screen sizes

Host GPU / HAXM / GenyMotion if too slugg

Running my app


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Logcat

Useful debugging tool:Log.d(MyActivity, App launched


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Quick question #1

You used an API method from API14. Yothe app on an API10-device. What happ

A. nothing

B. app crashes

C. it wouldnt even compile


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Quick question #1

You used an API method from API14. Yothe app on an API10-device. What happ

A. nothing

B. app crashes

C. it wouldnt even compileLINT


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Introduction

The System

The Tools

The A


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General considerations

Mobileapp?

Always ready to wrap up

Part of the environment

Highly context-dependent


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Mobileapp?





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Mobileapp?





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First project

Oh, theres a wizar


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First project

Warning: Scumbag Wizard

image: quickmeme.com
http://quickmeme.com/


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Whats inside?

src source (.java) res resources (.xml, .png)

libs libraries (.jar, .so)

assets misc files (.ttf, .html...)


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Layouts layout/my_super_layout.xml layout-land/my_super_layout.xml Translations values/strings.xml

values-es/strings.xml

Drawables

Dimensions

Animations

XML resources


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Parts of an appActivity Activity

Service BroadcastReceiver

Intent

BroadcastFragment

ViewView

View

Intent

Non-UI

UI


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Ordnung muss sein

AndroidManifest.xml Activities, Services, global BroadcastRec

IntentFilters

Permissions

...


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Activity

Whole-screen UI

controller

Views organized in

layouts

Manages Fragments

Peculiar lifecycle

Activity

The lifecycle

onCreate

onStart

onResume

onPause

onStop

onDestroy

Lets c

The Hollyw

Dont call u


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View

UI control

Inflated from XML or created in Java

Can be nested (tree)


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Sample View types

ListView

Tex

Butto


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Layouts are Views, too

LinearLayout RelativeLayout Frame

img: developer.android.
http://developer.android.com/http://developer.android.com/


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Quick question #2

Q: Can an app have no UI at all?


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Q: Can an app have no UI at all?A: Yes!

Quick question #2

Our app

Network statuschange

Systembroadcast

BroadcastReceiver Se


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Navigating through the app

Moving from one Activity to another: using Intent class

Intents:

Explicit: Intent(this, MyNextActivity.class); Implicit: Intent(Intent.ACTION_VIEW);

Extras


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Summary

Android development - more than cod Activities and fragments host UI beha

Think of layouts in functional terms

Intents express where you want to go


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Question time!


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Thats all, folks!

See you in January :)

android development - part 1

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