Intro to Android Development
Getting started
1. Install Android SDK (includes Eclipse;
http://developer.android.com/sdk/index.html) .
2. If using Windows & eclipse & Samsung Galaxy,
install Galaxy driver.
– Install Samsung Kies application.
• Download from http://www.samsung.com/us/kies/.
• Do not check Unified Driver Installer.
– No need to install Galaxy drivers when using Linux +
eclipse.
Download Albie (AIMv1).
1. First, make sure that your Eclipse Java ADT is
installed and running correctly.
–
–
File -> New -> Android Application Project.
Call it Test and make sure you can build and run it.
2. Unzip aimv1.zip but do not unzip it directly into the
eclipse workspace.
–
The directory, AIMv1, will be created.
3. File --> Import...
–
–
–
Expand Android folder.
Select 'Existing Android Code Into Workspace.'
Next.
Download Albie (continued).
4. Use Browse to find the Root Directory which is
AIMv1 (unzipped above).
–
–
Check 'Copy projects into workspace.'
Finish.
5. The AIMv1 folder should now appear in the eclipse
Package Explorer.
6. You may ignore the error message, "Unable to
resolve target 'android-#.'"
Download Albie (continued).
7. Start with a fresh build by doing the following:
–
–
–
Select AIMv1 in Package Explorer.
Project -> Clean
Run -> Run As -> Android Application
• Ignore any and all directories/folders with CVS
in the name.
ac·tiv·i·ty [ak-tiv-i-tee]
– noun, plural ac·tiv·i·ties.
1. the state or quality of being active: There was
not much activity in the stock market today. He
doesn't have enough physical activity in his life.
2. a specific deed, action, function, or sphere of
action: social activities.
3. work, especially in elementary grades at school,
that involves direct experience by the student
rather than textbook study.
4. energetic activity; animation; liveliness.
5. a use of energy or force; an active movement or
operation.
• from http://dictionary.reference.com/browse/activity
Definition: Activity
• Activity
– “An application usually consists of multiple activities
that are loosely bound to each other.
– Typically, one activity in an application is specified as
the "main" activity, which is presented to the user
when launching the application for the first time.
– Each activity can then start another activity in order
to perform different actions.”
• developer.android.com/guide/components/activities.html
Definition: Activity
• Activity
– “An Activity is an application component that
provides a screen with which users can interact in
order to do something, such as dial the phone,
take a photo, send an email, or view a map.
– Each activity is given a window in which to draw
its user interface.
– The window typically fills the screen, but may be
smaller than the screen and float on top of other
windows.”
• Ibid. (That’s fancy! I’m working on using op. cit.)
Associated with the main
activity is an XML file that
describes its UI layout.
Definition: Activity
• Activity
– “Each time a new activity starts, the previous activity is
stopped, but the system preserves the activity in a stack (the
"back stack").
– When a new activity starts, it is pushed onto the back stack
and takes user focus.
– The back stack abides to the basic "last in, first out" stack
mechanism, so, when the user is done with the current
activity and presses the Back button, it is popped from the
stack (and destroyed) and the previous activity resumes.”
• Ibid.
These Java files are
automatically generated. Do
not edit them!
Layouts
1. AbsoluteLayout
2. DrawerLayout
3. FrameLayout
4. GridLayout
5. GridView
6. LinearLayout
7. ListView
8. RelativeLayout
9. SlidingPaneLayout
10. WebView
XML
xml – extensible markup language
Example:
<?xml version="1.0" encoding="ISO-8859-1"?>
<shiporder
orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="shiporder.xsd">
<orderperson>John Smith</orderperson>
<shipto
name="Ola Nordmann"
address="Langgt 23"
city="4000 Stavanger"
country="Norway“ />
<item>
<title>Empire Burlesque</title>
<note>Special Edition</note>
<quantity>1</quantity>
<price>10.90</price>
</item>
<item>
<title>Hide your heart</title>
<quantity>1</quantity>
<price>9.90</price>
</item>
</shiporder>
prolog
xml – extensible markup language
Example:
<?xml version="1.0" encoding="ISO-8859-1"?>
<shiporder
orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="shiporder.xsd">
<orderperson>John Smith</orderperson>
<shipto
name="Ola Nordmann"
address="Langgt 23"
city="4000 Stavanger"
country="Norway“ />
<item>
<title>Empire Burlesque</title>
<note>Special Edition</note>
<quantity>1</quantity>
<price>10.90</price>
</item>
<item>
<title>Hide your heart</title>
<quantity>1</quantity>
<price>9.90</price>
</item>
</shiporder>
start tag
end tag
xml – extensible markup language
Example:
<?xml version="1.0" encoding="ISO-8859-1"?>
<shiporder
orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="shiporder.xsd">
<orderperson>John Smith</orderperson>
<shipto
name="Ola Nordmann"
address="Langgt 23"
city="4000 Stavanger"
country="Norway“ />
<item>
<title>Empire Burlesque</title>
<note>Special Edition</note>
<quantity>1</quantity>
<price>10.90</price>
</item>
<item>
<title>Hide your heart</title>
<quantity>1</quantity>
<price>9.90</price>
</item>
</shiporder>
tags w/ contents:
item tag has contents.
title, note, quantity, and
price tags also have
contents.
xml – extensible markup language
Example:
<?xml version="1.0" encoding="ISO-8859-1"?>
<shiporder
orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="shiporder.xsd">
<orderperson>John Smith</orderperson>
<shipto
name="Ola Nordmann"
address="Langgt 23"
city="4000 Stavanger"
country="Norway“ />
<item>
<title>Empire Burlesque</title>
<note>Special Edition</note>
<quantity>1</quantity>
<price>10.90</price>
</item>
<item>
<title>Hide your heart</title>
<quantity>1</quantity>
<price>9.90</price>
</item>
</shiporder>
empty tag (no end tag).
xml – extensible markup language
Example:
<?xml version="1.0" encoding="ISO-8859-1"?>
attribute name
<shiporder
orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="shiporder.xsd">
<orderperson>John Smith</orderperson>
<shipto
name="Ola Nordmann"
address="Langgt 23"
city="4000 Stavanger"
country="Norway“ />
<item>
<title>Empire Burlesque</title>
<note>Special Edition</note>
<quantity>1</quantity>
<price>10.90</price>
</item>
<item>
<title>Hide your heart</title>
<quantity>1</quantity>
<price>9.90</price>
</item>
</shiporder>
attribute value
xml – extensible markup language
Example:
<?xml version="1.0" encoding="ISO-8859-1"?>
<shiporder
orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="shiporder.xsd">
<orderperson>John Smith</orderperson>
<shipto
name="Ola Nordmann"
address="Langgt 23"
city="4000 Stavanger"
Note: The shiporder tag
country="Norway“ />
<item>
has both attributes and
<title>Empire Burlesque</title>
contents.
<note>Special Edition</note>
<quantity>1</quantity>
<price>10.90</price>
</item>
<item>
<title>Hide your heart</title>
<quantity>1</quantity>
<price>9.90</price>
</item>
</shiporder>
The manifest lists and
contains information
about all of the
activities in the
application.
XML AND LAYOUTS
SETTING UP THE ANDROID
DEVELOPMENT ENVIRONMENT
Setup on PC
1. Install eclipse + android (see
http://developer.android.com/sdk/index.html).
–
Instructions are there if eclipse is already installed.
2. Enable virtualization in BIOS.
– On a Lenovo T510, press F1 when you see the
“ThinkVantage” message.
Setup on PC
Two ways to run Android apps:
1. Create a virtual device.
•
Note: It takes some time for the emulator to start. So don’t
close it once it starts! (Use the ‘back’ button to stop you
application.)
2. Use a real android device. BEST!
Setup on PC for Galaxy
• Install the Android USB driver for Samsung.
– First, install Samsung Kies software.
• This will take some time (~1 hour).
• Then it will update itself again.
– Then plug in the Galaxy; your laptop will install a number
of drivers.
– If all is well, when you run adb devices on your laptop, you
will see your device listed.
Steps to run your Android
application
1. Right-click on the name of your project in the
Project Explorer pane.
2. Choose your Android device (or virtual
device). (See next slide.)
Setup
Setup on Android device
• Setting --> Security --> Unknown source
– Make sure it’s checked.
• Settings --> Developer options --> USB
debugging
– Make sure it’s checked.
Comments about layouts
• Layouts may be nested/hierarchical.
• See http://www.learnandroid.com/2010/01/05/android-layouttutorial/ for a layout tutorial.
HOW TO LOG MESSAGES FOR
DEBUGGING
Writing to the log
import android.util.Log;
…
Log.v( "andy1", "MainActivity.sendMessage: hello" );
d – debug
e – error
i – information
v – verbose
w – warning
Accessing the log file via eclipse
ANDROID WIDGETS
Android widget classes
• More than 100!
– See http://developer.android.com/reference/android/widget/packagesummary.html.
•
•
•
•
•
•
•
•
•
Button
EditText
ImageButton
ImageView
NumberPicker
PopupMenu
RadioButton, RadioGroup
Toast
ToggleButton
LAYOUT EDITOR
Palette contents disappear when
Show Previews is selected (default)
Summary
• Activity
– http://developer.android.com/reference/android/
app/Activity.html
• Intent
– http://developer.android.com/reference/android/
content/Intent.html
References
• developer.android.com/guide/topics/ui/declaring-layout.html
• developer.android.com/guide/topics/ui/layout/linear.html;
developer.android.com/reference/android/widget/LinearLayout.html
• developer.android.com/guide/topics/ui/layout/relative.html;
developer.android.com/reference/android/widget/RelativeLayout.html
• developer.android.com/guide/webapps/webview.html;
developer.android.com/reference/android/webkit/WebView.html
• developer.android.com/guide/topics/ui/layout/listview.html;
http://developer.android.com/reference/android/widget/ListView.html
• developer.android.com/guide/topics/ui/layout/gridview.html;
http://developer.android.com/reference/android/widget/GridView.html
• http://developer.android.com/tools/debugging/debugging-log.html
• http://developer.android.com/reference/android/widget/packagesummary.html
• http://www.learn-android.com/2010/01/05/android-layout-tutorial/
How to disable the native Android
browser (not Firefox, etc.) from “going
mobile.”
1. Open browser
2. Type "about:debug" in the address bar. Press
"go.“ Nothing will happen, this will only
enable more options in the menu.
3. Go to menu. (Notice ‘Dump V8 counters’ at
bottom.)
4. Choose Settings -> Debug -> UAString.
5. Select "desktop."