Developing Apps for Android - OPCUG · Edit text directly in the XML file or in the preview window...

Developing Apps for Android

Alan German

Ottawa PC Users’ Group

Get the “How-to” from Youtube

Writing your first Android app – everything you need to know

https://www.youtube.com/watch?v=mAJeK283j0I

Gary Sims, Android Authority

Download Android Studio

https://developer.android.com/studio

Installation Instructions

Ctrl-C to cut

from web page

Ctrl-Shift-V

to paste into

Terminal

• Ignore Youtube download (JDK) and setup steps

• Unpack zip file to create the folder android-studio

• Run sudo caja (give file manager root access)

• Move android-studio to /usr/local

• Run /usr/local/android-studio/bin/studio.sh

Linux Installation

navigate to the android-studio/bin/ directory, and execute studio.sh

Leave all defaults:

• Installation type = Standard

• Verify Settings

• Emulator Settings

• Download Components

(e.g. SDK, Android Emulator)

Setup Wizard

Download and installation of multiple components

takes several minutes - eventually we get to the…

Main Menu!

Menu – Programming – Android Studio

(and… Add to desktop)

Click to display the Event Log

Project

tree

Code editor and design

Message area

Palette (Widgets) Properties

Design/Text

Text Mode

Preview

Edit text directly in

the XML file or in

the preview window

So, what are people

going to do?

So, what are people

going to do?

…let’s prepare a

response!

public void onButtonTap(View v) {

Toast myToast = Toast.makeText(

getApplicationContext(),

“Some text in response",

Toast.LENGTH_LONG);

myToast.show();

}

Add a toast*

*A “toast” is a message that is

briefly displayed on the screen

Run the current project

(app) in the emulator

Press!

Build a Release Version

Fix? - Remove the line:

android:layout_below="@+id/textView"

touchy_button.apk

Available from the aStore

or from the Pl-a-y Store

App Now Available!

Touchy Button

$0.01