Sasi's Android Development Tutorials

As You have Seen In The Previous Blog How to set Up an Eclipse IDE to Work With Android Development
Once you have set up the Android Virtual Device You will now need to configure the Runimg or the debugging
For this You can go to Run->Run Configurations
On the Left Panel Select the Android Node

Click on the Browse and select the Hello_World Application that we have created Now click on run
You emulator will start working and you will get the following output

So you have now run your first android app congratulations!!!!!!!!! but your are Blank its OK that how it works we will be expert very soon

Now coming back to the eclipse

You will see a screen like this

In the Bottom left side you can see two tabs Graphical Layout and Activity_Main.Xml.Graphical Layout is self explanatory

Activity_Main.xml is xml file that defines the graphical lay out of you app

In your emulator you can see Hello World because here in second last line android:text="@string/hello_world"

Now you can change this string as you desire and again run the applications you can see the changes as applied

THE JAVA FILE

In order to change the working of the android application we now need make the changes in the java file that is MainActivity.java

To locate this file go to the MainActvity as shown in the figure

You will find the following Java file

For the time being let just keep these things in the mind we will come back here later in greater details

Hello Guys, I appreciate your effort to learn to develop an android App.Since you have decided to create an android app I m sure you already know the influence and necessity of android as OS.

So guess we can now go the point where we can technically know the hows of an android app

Some of the Important point you need to know before we go further

Android Code is written using Java syntax

If Know Java well and good if don't Know Java your love for programming will make learning easy for you so no worries go ahead

What you need to Begin

Required OS Specifications

Ø Microsoft Windows -XP or Later

Ø Mac OS X 10.5.8 or Later(Intel Chips Only)

Ø Linux(Including GNU C Library 2.7 or later)

Required Software specifications

Ø The android SDK Starter Package

Ø Java Development Kit (JDK) 5 or 6 you can download it from http://java.sun.com/javase/downloads/index.jsp

IDE Required

Ø Eclipse

All the above requirements are open source and hence free

Downloading and installing Android SDK

1. Link to download the latest Android SDK as per your OS

http://developer.android.com/sdk/index.html

2. After downloading run the sdk manager.exe

3. You can see the following screen

Download the latest packages of frame work sdk

1. latest version of tools, compatibility/support library,

2. documentation and

3. sample code

When you click on the install package button, The packages you have chosen will be installed and we can move further

Developing with eclipse

Eclipse is a popular open-source IDE for Java development.It is available for free download for Windows mac and Linux from the eclipse foundation.

www.eclipse.org/downloads

Many variations of eclipse are available with eclipse 3.5(Galileo or above)

You will require the following tools along with eclipse for android development

Ø Eclipse Java Development tools (JDT Plug-in)

Ø Web Standard Tools (WST)

These packages come along with the eclipse so don't need to worry about their installation

Using the Android Development tools Plug-In for Eclipse

As i had said earlier that eclipse is commonly used for java development so question arises how are we going to develop android Apps

The answer to this is Android development tools (ADT) Plug-Ins

ADT Plug-in can make creating, testing, and debugging your applications faster and easier

Installing the ADT Plugin

Steps

1. Open Eclipse

2. Select Help / Install new software

3. Click on the add button

5. Type up a name that you might remember for future Reference

6. Eg.Android Developer Tools

8. In the Location Field Type :https://dl-ssl.google.com/android/eclipse/.

9. Click Ok and eclipse will search for the ADT Plug-in. When Finished it displays for the availablePlug-ins.

10. Select the check box next to Developer Tools root node and then click next

11. Eclipse Now downloads the plug-ins. When it finishes. a list of developer displays for your review. Click Next

12. Read and accept the terms of the license agreement, and click next and finish. As the ADT Plug-in is not signed you will be prompted before instalation continues.

13.

When installation is complete, you need restrat Eclipse and update the ADT preferences. Restart and select Window Preferences(Or eclipse updates to -> Preferences for Mac OS)

14. Select Android From Left Panel.

15. Click Browse, Navigate to the folder into which you installed the android SDK, and then click apply. The list displays each available SDK target

16. Click OK to complete the installation.

Creating your First Android Application

1. Select -> File -> New ->Project.

2. Select the android project application type from the android folder, and click next.