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Android Training

Android Training. Nelson To. PreInstall Components . Android SDK • http://code.google.co... Java Standard Development Kit (JDK) version 5.0/6.0 (download) http://www.oracle.com... If you already have installed JDK 5.0/6.0, you can skip this. Eclipse Ganymede • http://eclipse.org/do...

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Android Training

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  1. Android Training Nelson To

  2. PreInstall Components • Android SDK • http://code.google.co... • Java Standard Development Kit (JDK) version 5.0/6.0 (download) http://www.oracle.com... • If you already have installed JDK 5.0/6.0, you can skip this. • Eclipse Ganymede • http://eclipse.org/do... •  Eclipse ADT Plugin • https://dl-ssl.google...

  3. What is Android • Android is not an operating system • Android is build on top of Linux Kernel • Android is not equivalent to Linux Kernel • Android is an open source • Android devices sales 160,000 per day

  4. Android and Java • Android does not use the standard JVM • Android own its own JVM(Dalvik) • Android Dalvik vs standard JVM • register-based vs stack-based • more efficient and compact implementation • different set of java libraries than standard java libraries

  5. Android FrameWork Stack

  6. Android Linux Kernel • Hardware abstraction layer • Memory Management • Process Management • Networking • ...

  7. Android Native Libraries • Bionic • Surface Manager • 2D and 3D grahics • Media codecs • SQLite • WebKit • ...

  8. Android Framework • ActivityManager • Content providers • Resource manager • Location Manager • Notification Manager • ...

  9. Android Application • Android applications • google maps • facebook  • twitter • ...

  10. AndroidSDK • Tools • Docs • Platforms • Android XX • Data • Skins • Images • Samples • Add-ons • Google API

  11. Android Process and Thread • Linux process per application • One thread per process • UI Thread • manage Looper message

  12. Android Application Components • Activity • Service • Broadcast receiver • Content provider

  13. Android Activity • a single, focused thing that the user can do • takes care of creating a window for user • presentation to the user  • full-screen windows • floating windows • embedding inside of another activity • lifecycle • void onCreate(Bundle savedInstanceState)  • void onStart()   • void onRestart()   • void onResume()   • void onPause()   • void onStop()   • void onDestroy()

  14. Android Service •  to perform a longer-running operation while not interacting with the user • can be started and stopped • doesn't have UI • run by activities • implicit Service (binding service) • explicit Service (start service) • lifecycle • void onCreate()   • void onStart(Intent intent)   • void onDestroy()

  15. Android Content Provider • store and retrieve data and make it accessible to all applications • to share data across applications

  16. Android Broadcast Receiver • receive intents sent by sendBroadcast() • two type of broadcasts • Normal broadcast • Ordered broadcast

  17. Android Activity LifeCycle

  18. Android Intents • an abstract description of an operation to be performed • action • data • Explicit Intents (specified a component) • Implicit Intents 

  19. Hello World Project • Projec Name • Target • Application Name • Package name • Min SDK version

  20. Hello World Project • src • gen • Android XX • res • assets

  21. Hello World Project Manifest file <?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.teach.helloworld"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".helloworld"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>    <uses-sdk android:minSdkVersion="4" /></manifest>

  22. Hello World Project Layout file <?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:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    /></LinearLayout>

  23. Hello World Project Helloworld.java package com.teach.helloworld;import android.app.Activity;import android.os.Bundle;public class helloworld extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }}

  24. Hello World Project R.java package com.teach.helloworld;public final class R {    public static final class attr {    }    public static final class drawable {        public static final int icon=0x7f020000;    }    public static final class layout {        public static final int main=0x7f030000;    }    public static final class string {        public static final int app_name=0x7f040001;        public static final int hello=0x7f040000;    }}

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