Android Tutorial

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Libraries On top of Linux kernel there is a set of libraries including open-source Web browser engine WebKit, well known library libc, SQLite database which is a useful repository for storage and sharing of application data, libraries to play and record audio and video, SSL libraries responsible for Internet security etc. Android Runtime This is the third section of the architecture and available on the second layer from the bottom. This section provides a key component called Dalvik Virtual Machine which is a kind of Java Virtual Machine specially designed and optimized for Android. The Dalvik VM makes use of Linux core features like memory management and multi-threading, which is intrinsic in the Java language. The Dalvik VM enables every Android application to run in its own process, with its own instance of the Dalvik virtual machine. The Android runtime also provides a set of core libraries which enable Android application developers to write Android applications using standard Java programming language. Application Framework The Application Framework layer provides many higher-level services to applications in the form of Java classes. Application developers are allowed to make use of these services in their applications. Applications You will find all the Android application at the top layer. You will write your application to be installed on this layer only. Examples of such applications are Contacts Books, Browser, Games etc. TUTORIALS POINT Simply Easy Learning
CHAPTER 4 Application Components Application components are the essential building blocks of an Android application. These components are loosely coupled by the application manifest file AndroidManifest.xml that describes each component of the application and how they interact. There are following four main components that can be used within an Android application: Components Activities Services Broadcast Receivers Content Providers Activities Description They they dictate the UI and handle the user interaction to the smartphone screen They handle background processing associated with an application. They handle communication between Android OS and applications. They handle data and database management issues. An activity represents a single screen with a user interface. For example, an email application might have one activity that shows a list of new emails, another activity to compose an email, and another activity for reading emails. If an application has more than one activity, then one of them should be marked as the activity that is presented when the application is launched. An activity is implemented as a subclass of Activity class as follows: public class MainActivity extends Activity { } Services A service is a component that runs in the background to perform long-running operations. For example, a service might play music in the background while the user is in a different application, or it might fetch data over the network without blocking user interaction with an activity. A service is implemented as a subclass of Service class as follows: public class MyService extends Service { TUTORIALS POINT Simply Easy Learning
Page 1 and 2: Android Tutorial
Page 3 and 4: ABOUT THE TUTORIAL Android Tutorial
Page 5 and 6: Accessing Resources ...............
Page 7 and 8: RadioButton .......................
Page 9 and 10: Web browser Multi-touch Multi-taski
Page 11 and 12: Alternatively, you could also right
Page 13 and 14: Step 4 - Setup Android Development
Page 15 and 16: Now select all the listed plug-ins
Page 17: CHAPTER 3 Architecture Android oper
Page 21 and 22: CHAPTER 5 Hello World Example Let u
Page 23 and 24: Anatomy of Android Application Befo
Page 25 and 26: else needed to run an Android appli
Page 27 and 28: The R File The gen/com.example.hell
Page 29 and 30: Congratulations!!! you have develop
Page 31 and 32: from the R.color class. drawable/ l
Page 33 and 34: Now you can set the text on a TextV
Page 35 and 36: onPause() onStop() onDestroy() The
Page 37 and 38: 07-19 15:00:43.405: D/Android :(866
Page 39 and 40: To create an service, you create a
Page 41 and 42: } Example This example will take yo
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Page 45 and 46: To stop the service, you can click
Page 47 and 48: android:label="@string/app_name" an
Page 49 and 50: } { } Intent intent = new Intent();
Page 51 and 52: Now to broadcast our custom intent,
Page 53 and 54: CHAPTER 10 Content Providers A cont
Page 55 and 56: import android.net.Uri; import andr
Page 57 and 58: } super(context, DATABASE_NAME, nul
Page 59 and 60: } return count; } @Override public
Page 61 and 62: Now let's enter student Name and Gr
Page 63 and 64: You can write activities against up
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} } * Inflate the layout for this f
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To change the mode of the emulator
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CHAPTER 12 Intents and Filters An A
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16 17 18 19 20 21 22 23 24 25 26 27
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56 57 58 ACTION_VOICE_COMMAND Start
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21 CATEGORY_INFO Provides informati
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20 EXTRA_SHORTCUT_NAME The name of
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super.onCreate(savedInstanceState);
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Similar way you can launch phone in
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setContentView(R.layout.activity_ma
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Let's try to run
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Now if you select Browser, then And
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CHAPTER 13 UI Layouts The basic bui
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1 You will use Eclipse IDE to creat
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Relative Layout Android RelativeLay
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Example This example will take you
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android:layout_toLeftOf="@+id/times
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2 Modify the detault content of res
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android:layout_x android:layout_y T
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Following are the important attribu
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Android ListView is a view which gr
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android:id="@+id/country_list" andr
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Defines how columns should stretch
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HelloWorld Settings Following will
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Let's try to run our modified Hello
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int position, long id) { // Send in
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android:targetSdkVersion="17" />
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Kindly note above mentioned images
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fill_horizontal 0x07 Grow the horiz
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suggestions automatically while the
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normal - 0 sans - 1 serif - 2 mo
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android:name="com.example.guidemo.M
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Inherited from android.view.View Cl
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Following will be the content of re
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Exercise: I will recommend to try a
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} } Following will be the content o
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tnProduct.setOnClickListener(new On
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android:label="@string/app_name" an
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android:background android:contentD
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Following is the default content of
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android:background android:contentD
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esult.append("\nPerl Selection : ")
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Let's try to run your GUIDemo6 appl
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android:editable android:text If se
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android:id="@+id/button1" android:l
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(R.id.radioGroup1); btnWebsiteName
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Let's try to run your GUIDemo8
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package com.example.guidemo9; impor
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Following will be the conten
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The following screen will appear if
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CHAPTER 15 Event Handling Events ar
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import android.app.Activity; import
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installs the app on your AVD and st
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Now you try to click on two buttons
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Again let's try to run your EventD
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Defining Styles A style is defined
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} }); @Override public boolean onCr
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Let's try to run your StyleDemo a
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Following example demonstrates how
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android:orientation="vertical" >
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CHAPTER 17 Custom Components Androi
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1 2 3 You will use Eclipse IDE to c
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Let's try to run your DateV
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import android.content.Context; imp
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android:textSize="40sp" android:bac
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custom:delimiter="-" custom:fancyTe
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Following example shows you how to
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} Following will be the content of
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Example Following example shows the
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} } /* Invoking the default notific
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android:label="@string/app_name" an
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Next, you can click on "Detail of n
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