Synapseindia android apps application

Android Application
Development

Overview
 What is Android?
 Why teach Android?
 What do you need in order to teach Android?
 Hello, Android
 Basic Android graphics
 Lunch
 Part 2: More Android!

What is Android?
An open source Linux-based operating system
intended for mobile computing platforms
 Includes a Java API for developing applications
 It is not a device or product

NYC High School Girls Build Android Apps

Engaging Students with Android
 Android has a lot of “buzz” now
– Newness
– Coolness
– Googleness
 UI and graphics made simple(r)
 Advanced Java skills

What Skills Will Students Learn?
 Reinforce the basics: OOP, decomposition, etc.
 Separation of UI design and functionality
 XML and resource files
 Events and Listeners
 Callback methods
 Threads

Android vs. iPhone
 Java vs. Objective-C
 Direct install vs. Marketplace vs. App Store
 Open source?

What do you need in order
to teach Android?

What Should Students Already Know?
 Java!
– inheritance, method overriding
– interfaces, casting
– exceptions
– debugging
– reading API documentation
 Eclipse
– easy to pick up quickly, though

Do I Need Phones?
 The emulator that is part of the Android toolset for
Eclipse is quite good (though a bit slow)
 You may be able to get free “developer phones”
from Google

Online Resources
 developer.android.com
 code.google.com/p/apps-for-android/
 stackoverflow.com
 videos from Google I/O conferences

Creating Your First(?) Android App
1. Set up your development environment
1. Create a new Android project in Eclipse
1. Run it in the emulator
1. Hilarity ensues

1. Set Up Your Android Environment
 http://developer.android.com/sdk
 Install Eclipse
 Install Android SDK (Android libraries)
 Install ADT plugin (Android development tools)
 Create AVD (Android virtual device)
 We’ve already done this for you!!

2. Create an Android Project in Eclipse
 File → New → Project
 Select “Android Project”
 Fill in Project details...

Name that appears
on device
Directory
name
Class to
automatically
create
Java package
Android
version

3. Run the Android Application
 Run → Run (or click the “Run” button)
 Select “Android Application”
 The emulator may take a few minutes to start, so
be patient!
 You don't need to restart the emulator when you
have a new version of your application

Source
code
Auto-generated
code
UI
layout
String
constants
Configuration

HelloAndroid.java
1 public class HelloAndroid extends Activity {
2 /** Called when the activity is first created. */
3 @Override
4 public void onCreate(Bundle savedInstanceState)
5 {
6 super.onCreate(savedInstanceState);
7 setContentView(R.layout.main);
8 }
9 }

main.xml
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 android:orientation="vertical"
5 android:layout_width="fill_parent"
6 android:layout_height="fill_parent"
7 >
8 <TextView
9 android:layout_width="fill_parent"
10 android:layout_height="wrap_content"
11 android:text="@string/hello "
12 />
13 </LinearLayout>

strings.xml
2 <resources>
3 <string name="hello">Hello World, HelloAndroid!
4 </string>
5 <string name="app_name">Hello, Android</string>
6 </resources>

AndroidManifest.xml
2 <manifest
3 xmlns:android="http://schemas.android.com/apk/res/android"
4 package="edu.upenn.cis542"
5 android:versionCode="1"
6 android:versionName="1.0">
7 <application android:icon="@drawable/icon"
8 android:label="@string/app_name">
9 <activity android:name=".HelloAndroid"
10 android:label="@string/app_name">
11 <intent-filter>
12 <action
13 android:name="android.intent.action.MAIN" />
14 <category
15 android:name="android.intent.category.LAUNCHER"/>
16 </intent-filter>
17 </activity>
18 </application>
19 </manifest>

Synapseindia android apps application

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