android-tutorial-for-beginner

An android development tutorial for beginners... Ajailal.P

MOBILE OS Symbian iPhone RIM's BlackBerry Window mobile Linux Palm WebOS Samsung BADA OS Android … .

WHAT IS ANDROID? Google  OHA (Open Handset Alliance) The first truly open and comprehensive platform for mobile devices, all of the software to run a mobile phone but without the proprietary obstacles that have hindered mobile innovation. Linux OS kernel Java programming Open source libraries: SQLite, WebKit, OpenGL

WHY ANDROID A simple and powerful SDK No licensing, distribution, or development fees Development over many platform Linux, Mac OS, windows Excellent documentation Active developer community

ANDROID SDK FEATURE Network GSM, EDGE, and 3G networks, WiFi, Bluetooth Libraries SQLite (lightweight relational DB), WebKit layout engine coupled with chrome web browser, SSL VGA, 2D graphics library, 3D graphics library based on OpenGL ES 2.0 specifications, and traditional smart phone layouts. Hardware control video/still cameras, touch screens, GPS, accelerometers, gyroscopes, magnetometers, proximity and pressure sensors, thermometers, accelerated 2D and 3D graphics. Location-based service map (Google API)

ANDROID VERSIONS 1.5 Cupcake 1.6 Donut 2.0/2.1 Éclair 2.2 Froyo 2.3 Gingerbread 3.0 Honeycomb

TOOLS The Android Emulator Implementation of the Android virtual machine Test and debug your android applications. Dalvik Debug Monitoring Service ( DDMS ) Monitor and Control the Dalvik virtual machines Logcat (see logged msgs) Android Debug Bridge ( ADB ) Manage the state of an emulator instance or Android-powered device Copy files, install compiled application packages, and run shell commands. TraceView Graphical analysis tool for viewing the trace logs from your Android application Debug your application and profile its performance MkSDCard Creates an SD Card disk image

ANDROID APPLICATION ARCHITECTURE Views: Building block for user interface components. Activities A single, focused thing that the user can do. Interaction with users: creating a window to place UI

ANDROID APPLICATION ARCHITECTURE Services (Background) Ex: Network Operation Intent Inter-communication among activities or services Resource Externalization of strings and graphics Notification signaling users: Light, sound, icon, dialog, notification Ex: new message arrives Content Providers share data between applications Intent

VIEW Layout of visual interface Java Code Initialize Access TextView myTextView = (TextView)findViewById(R.id.myTextView); <?xml version=”1.0” encoding=”utf-8”?> <LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android” android:orientation=”vertical” android:layout_width=”fill_parent” android:layout_height=”fill_parent”> <TextView android:id=”@+id/myTextView” android:layout_width=”fill_parent” android:layout_height=”wrap_content” android:text=”Hello World, HelloWorld” /> </LinearLayout> @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.screen); } screen.xml

VIEW COMPONENT Widget Toolbox TextView, EditText,Button, Form, TimePicker… ListView Layout To positions of controls LinearLayout, Relativelayout, Menu ex. Exit, Settings etc

ACTIVITY A single, focused thing that the user can do. Activities are like a stack. So when we call startActivity(), we are telling Android "put this activity on top of mine” Foreground Activity: suspended when invisible Visual, interactive Ex: Game, Map Background Service : Little interaction Ex: Hardware, power management Intermittent Activity Notification

USER INTERACTION EVENT onKeyDown, onKeyUp onTrackBallEvent onTouchEvent myEditText. setOnKeyListener (new OnKeyListener () { public boolean onKey (View v, int keyCode , KeyEvent event ) { if (event.getAction() == KeyEvent.ACTION_DOWN) if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) { … return true; } return false; }});} registerButton. setOnClickListener (new OnClickListener() { public void onClick(View arg0) {….}}

INTENT An intent is an abstract description of an operation to be performed. Launch an activity Explicit Implicit: Android selects the best startActivity(); Subactivity: feedback Child: use intent as feedback, setResult ( before finish() ) Parent: onActivityResult startActivityForResult Action, data, extra parameter intent.putExtra(name, property) ; Ex: Intent intent = new Intent(MyActivity.this, MyOtherActivity.class);

SERVICE Service class public class MyService extends Service public void onStart() {…} Manifest.xml <service android:enabled=”true” android:name=”.MyService”></service> Control startService stopService Communication Bind service with activity: use public method and properties Intent

WORKING IN BACKGROUND Services NO GUI, higher priority than inactive Activities Usage: responding to events, polling for data, updating Content Providers. However, all in the main thread Background threads

THREADING What to thread? Network, file IO, Complex processing How ? new Thread Synchronize threads Handler.post() UI Thread ( AsyncTask ) doInBackground() onPreExecute() onProgressUpdate() onCancelled() onPostExecute()

EXTERNAL RESOURCES values/ String, color, array, dimension, style theme drawables/ Images, icon layout/ main.xml Menu menu.xml There can be separate layout and drawables folders for landscape and portrait orientation. There can be different layout and drawables folders for small, large and normal screen. And hdpi, mdpi, ldpi resolutions.

SERVICE APP – MANIFEST.XML Service Activity (intent-filter) Permission

NORMAL APPLICATION – MANIFEST.XML Application Activity 1 (main) Activity 2 SDK Version Screen Support

DEBUG Package - android.util.Log View results Logcat Eclipse IDE

DEBUG ON DEVICE On device Debug mode On desktop Connect your Phone with your PC When it asks for driver location choose For windows, android-sdk-windows-1.5_r3\usb_driver\x86\ You'll see sth like "HTC Dream Composite ADB Interface" on success (Re)Start Eclipse Your G1 should now be listed in the DDMS-Perspective under Device

INSTALL PACKAGE TO ANDROID PHONES Compile the apk packages in Eclipse Export signed application package adb install …apk Error: uninstall

DALVIK DEBUG MONITORING SERVICE

android-tutorial-for-beginner

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android-tutorial-for-beginner