Mobile Computing
Going to Market
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Copyright 2014 by Janson Industries
Objectives
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Learn about:
 Preparing
 Signing
 How
the app for market
and digital certificates
to export the signed app
 Signing
up as a Google developer
 Publishing
the app to the Android
marketplace
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Going To Market
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Apps have to be
 Versioned
 Signed
 Packaged
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into an .apk file
To version, make sure the following text
android:versionCode=”1” android:versionName=”1.0”
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Is in the manifest tag as follows
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="my.first.pkg" android:versionCode="1" android:versionName="1.0" >
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Going To Market
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This says its version 1
If we change the app and specify a new
version, the device will automatically
replace the old version, when the new
version is loaded
Also need a uses-sdk tag to identify the
minimum SDK Version required to run
app
 Eclipse
should have put it there already
<uses-sdk android:minSdkVersion="13" />
Copyright 2014 by Janson Industries
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Going To Market
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Right now
the app icon
is the
standard
Android
robot
If you want
a different
icon
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Copyright 2014 by Janson Industries
Going To Market
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Copy a png icon file into all the
drawable folders (icon.png)
In the application start tag change
icon from ic_launcher to icon
http://www.iconarchive.com/ has
many available for non-commercial
usage
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Going To Market
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Going To Market
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Copyright 2014 by Janson Industries
Going To Market
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Copyright 2014 by Janson Industries
An app is signed with a digital
certificate
A digital certificate (DC) has
A
signature
A
private/public key pair
And is stored in a keystore
A keystore has a list of DCs, each
with a alias
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Signing an App
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Need three things
A
keystore with a DC
 An .apk for the app
 The jarsigner utility
► The
Android plug-in has been taking
care of this when using the emulator
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Need to
 Generate
the DC
 Sign the .apk file
 Align app memory for efficiency
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Copyright 2014 by Janson Industries
Signing an App
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Create a folder (KeystoreFolder) to hold
keystore
From command prompt run the keytool
utility with following command:
 Make
sure the path is pointing to jdk/bin
keytool -genkey -v -keystore K:\Mobile\KeystoreFolder\MyFirstProject.keystore alias MFP -storepass jeter123 -keypass jeter123 -keyalg RSA -validity 15000
 -genkey
is the generate key command
 -v makes output visible to creator
 -keystore ids keystore name & location
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C:\Program Files\Java\jdk\bin
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Copyright 2014 by Janson Industries
Signing an App
keytool -genkey -v -keystore K:\Mobile\KeystoreFolder\MyFirstProject.keystore
-alias MFP -storepass jeter123 -keypass jeter123 -keyalg RSA –keysize 2048
-validity 15000
 -alias
ids keystore nickname
 -storepass ids keystore password
 -keypass ids password to access the
key
 -keyalg ids encryption algorithm to use
(RSA or DSA)
 -keysize number of bits (2048 rec min)
 -validity number of days key is valid
(10000 rec min)
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Signing an App
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After issuing the command will be
prompted for info
 First
and last names
 Organizational
 Organization
 City,
unit
name
State and Country code
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Enter same password as specified in the command then data
Doh! Fortunately will prompt if info is correct
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That’s better
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Hit Enter, Keystore and DC generated
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Hit Enter, Keystore and DC generated
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Copyright 2014 by Janson Industries
Signing an App
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Next we need to export a
signed .apk
In the Package Explorer
 Right
click MyFirstProject
 Click
Android Tools
 Click
Export Signed
Application Package
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Click the Next button
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Signing an App
Enter location of the keystore and the keystore password
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Signing an App
Select the alias and enter the key password
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Signing an App
Specify where to export to (notice 15000 days is over 40 years)
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Signing an App
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Next we need sign up as a Google developer at:
 https://play.google.com/apps/publish/signup
► Need
a Google account to be a developer!
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Scroll down and click continue
(This has probably changed since I did it – I didn't want to spend
another $25!)
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Accept the agreement and Continue
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Costs $25 to sign up as Developer, click Continue
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Sign into your Google account
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Fill in your payment info and click Agree and Continue
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Choose you privacy/contact settings and place the order
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Took a day before I could upload
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Specify title of app, click Upload APK
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Specify the .apk file and its location, click Upload
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Specify the .apk file and its location, click Upload
Drag and drop the apk file (or browse to it)
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Need to add all these thing to the app definition
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Click and select store listing
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Specify info about the app as well as screen snap shots, hi-res app
icon, promotional links, videos, privacy policy, pricing, etc.
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Must have at least two screen shots
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Must have a high resolution icon (can search for these)
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Must have category and contact info and privacy policy then Save
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Click and select pricing and distribution then decide paid/free and
countries
To sell must set up a merchant account. Google takes 30%.
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Consents then Save
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Status changed, click drop down arrow and select Publish this app
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If you forgot something, it will let you know
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If you just paid you will have to settle for saving for now and later go
back and publish
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Downloading and Installing an App
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Need to wait for Google to process
the “app publish” for app to show up
in a search
A
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couple hours worked for me
To search for an app, go to:
 https://play.google.com/store/apps
 Enter
the search criteria
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Specify search text, click on price to display more info and install
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Click install
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It may ask you to sign in (if phone has info on it, will just read info
and you will not have to type in)
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Click install again
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Will be installed soon
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When installed status will change to Installed
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AdProj will appear in the list of apps
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Copyright 2014 by Janson Industries