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Android L01 - Warm Up
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Inside: Java Primer, Android System, HelloWorld Project, Layouts.
Mohammad ShakerFollow
Software Engineer at SqulaAdvertisement
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Android L01 - Warm Up
- Cloud InteractionDesign Android
- READ
- It’s no longer about Building
- Learn and Measure Don’t just Build
- Why do you want this?
- IMPACT.
- Web apps vs. Native apps
- iOS vs. Android
- Objective-C/ Swift vs. Java
- 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>
- Ajax and XMLHttpRequest
- jQuery http://jquery.com/
- Frameworks • jQuery Mobile • PhoneGap • Sencha Touch • Xamarin • AngularJS + iconic • … etc
- Gaming
- Games (OpenGL, Metal and the rest)
- How we are gonna do it.
- Googling StackOVerFlow
- Android
- Cloud
- User Experience Interaction Design
- User Experience
- User Experience
- JavaPrimer
- Install JRE, JDK
- 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
- Java Write once, run anywhere
- Java Write once, run anywhere
- 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);
- Packages vs Namespaces
- void main(string[] args)
- 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
- interfaces
- Collections
- 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
- Iterators
- Lambdaj lambda expression
- Lambdaj LINQ-like
- Lambdaj https://github.com/ooxi/lambdaj
- Multithreading synchronized, wait, notify, notifyall
- Into Android!
- IDEs Eclipse, Android Studio
- 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
- Hello World
- Hello World
- Activity Life Cycle http://developer.android.com/reference/android/app/Activity.html
- File System
- File System
- Conventions
- USB Debugging
- Try it. Just run it.
- 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_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/textView1" android:layout_centerHorizontal="true" android:layout_marginBottom="18dp" android:text="@string/toggle_message" />
- 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_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/textView1" android:layout_centerHorizontal="true" android:layout_marginBottom="18dp" android:text="@string/toggle_message" />
- 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_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/textView1" android:layout_centerHorizontal="true" 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_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/textView1" android:layout_centerHorizontal="true" 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" />
- [OR] Adding a Click Event
- Run and see!
- Debug
- Debug Logging Log.d(“MY_TAG", ”Any message here.");
- UI Elements
- 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
- References
- READ
- 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
- Design Patterns, Gang of four
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