Android L01 - Warm Up

Cloud
InteractionDesign
Android

It’s no longer about Building

Learn and Measure
Don’t just Build

HTML5 and JavaScript
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="styles.css">
<meta charset="utf-‐-‐8">
<script src="scripts.js"></script>
<title>hello, world</title>
</head>
<body>
hello, world
</body>
</html>

JavaScript
<script type="text/JavaScript">
function loadFile(url)
{
var script = document.createElement('SCRIPT');
script.src = url;
document.getElementsByTagName('HEAD')[0].appendChild(script);
}
</script>

XML Simple Email
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>
Don't forget me this weekend!
</body>
</note>

Frameworks
• jQuery Mobile
• PhoneGap
• Sencha Touch
• Xamarin
• AngularJS + iconic
• … etc

Games (OpenGL, Metal and the rest)

User Experience
Interaction Design

Java
JVM – Java Virtual Machine

API
http://java.sun.com/javase/6/docs/api/
Tutorial
http://java.sun.com/docs/books/tutorial/java/TOC.html

Reserved Words
abstract continue for new switch
assert*** default goto* package synchronized
boolean do if private this
break double implements protected throw
byte else import public throws
case enum**** instanceof return transient
catch extends int short try
char final interface static void
class finally long strictfp** volatile
const* float native super while
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/_keywords.html

Primitive Types
byte
short
int
long
float
double
boolean
char

Variables Naming
• Subsequent characters also can be numbers
• Case sensitive
• No spaces
• Examples:
name
firstName
phoneNumber

Arrays
int[] grades;
grades = new int[15];
Control flow
if (boolean) {
// perform this code
} else {
// otherwise, run this
}

Referencing
int hoursePower = 100;
Car myCar = new Car(hoursePower );
Car yourCar = new Car(hoursePower + 50);
myCar = yourCar;
Print(myCar.HorsePower);

Instance vs Class
methods
void shootBall(Point point)
static void main(string[] args)

Inheritance and
Polymorphism
extends, super, @Override

Some diff.
protected in a form of package scope not class scope

Some diff.
final vs const vs readonly

Example
ArrayList<String> arrList = new ArrayList<String>();
arrList.add(“A”);
arrList.add(“AB”);
arrList.add(“ABC”);
arrList.add(“ABCD”);
// using indices
arrList.set(0, arrList.get(1));
arrList.set(1, “foo”);

Example
• What does the following mean?
ArrayList<String> A1;
// bla bla
List<String> list = new ArrayList<String>(A1);

for-each
• Looping by indices
• for-each, parallel execution
for (Object o : collection)
System.out.println(o);

Collection Operations
List<Type> list1 = new ArrayList<Type>();
// …
List<Type> list2 = new ArrayList<Type>();
// …
List<Type> list3 = new ArrayList<Type>(list1);
list3.addAll(list2);

List Algorithms
• sort — sorts a List using a merge sort algorithm, which provides a fast,
stable sort. (A stable sort is one that does not reorder equal elements.)
• shuffle — randomly permutes the elements in a List.
• reverse — reverses the order of the elements in a List.
• rotate — rotates all the elements in a List by a specified distance.
• swap — swaps the elements at specified positions in a List.
• replaceAll — replaces all occurrences of one specified value with
another.
• fill — overwrites every element in a List with the specified value.
• copy — copies the source List into the destination List.
• binarySearch — searches for an element in an ordered List using the
binary search algorithm.
• indexOfSubList — returns the index of the first sublist of one List that
is equal to another.
• lastIndexOfSubList — returns the index of the last sublist of
one List that is equal to another.
See more @ http://docs.oracle.com/javase/tutorial/collections/interfaces/list.html

Lambdaj
https://github.com/ooxi/lambdaj

Multithreading
synchronized, wait,
notify, notifyall

Android versions and versions and versions

Android Developer
http://developer.android.com

Tools
• android - Android SDK manager. Create/delete/view Android
Virtual Devices and update the SDK with new platforms/add-
ons.
• ddms - Dalvik Debug Monitor Server. Screen caps,
thread/heap info, process/state info, ..
• emulator - The application responsible for opening AVDs
instances.
• sqlite3 - manage SQLite databases.

SDK – Cont.
• # adb - Android Debug Bridge. A client/server program that
manages the state of an emulated device.
• # aapt - Android Asset Packaging Tool.
• # dx - The converter; converts .class ﬁles to Android
bytecode.

Creating Your First Android App

Create Project with Android Studio
• Build SDK is the platform version against which you will
compile your app. By default, this is set to the latest version
of Android available in your SDK.
• Minimum Required SDK is the lowest version of Android
that your app supports

Activity Life Cycle
http://developer.android.com/reference/android/app/Activity.html

activity_main.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/hello_world"
tools:context=".MainActivity" />
</RelativeLayout>

Adding your first button
• res > values > strings
• Add toggle_message to strings file.
• And in the activity_main.xml file
<Button
android:id="@+id/button1"
android:layout_above="@+id/textView1"
android:layout_marginBottom="18dp"
android:text="@string/toggle_message" />

Adding a Click Event
• MainActivity.java
public void toggleMessageOnClick(View view) {
TextView textView = (TextView)findViewById(R.id.textView1);
textView.setText("Bonjour Monde!");
}
• activity_main.xml
<Button
android:id="@+id/button1"
android:layout_above="@+id/textView1"
android:layout_marginBottom="18dp"
android:text="@string/toggle_message“
android:onClick="toggleMessageOnClick" />

[OR] Adding a Click Event
• MainActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button)findViewById(R.id.button1);
btn.setOnClickListener(new onClickListener() {
@Override
public void onClick(View arg0){
TextView textView = (TextView)findViewById(R.id.textView1);
textView.setText("Bonjour Monde!");
}
});
}
• activity_main.xml
<Button
..
android:onClick="toggleMessageOnClick" />

Debug Logging
Log.d(“MY_TAG", ”Any message here.");

What do you think is better/faster?

What do you think is better/faster?
faster slower

Menus
http://developer.android.com/guide/topics/ui/menus.html

Menus
Options Menu Context menu Popup Menu

Always!
http://developer.android.com/

Attend Harvard’s OpenCourseWare 201[2]!
Building Mobile Applications, http://cs76.tv/2012/spring/
Mobile Software Engineering, http://cs164.tv/2012/spring/
Or Lynda, Udacity, Coursera

Android L01 - Warm Up

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