How to develop hello world mobile application using android

We started with android introduction few days back and plunged into android revolution.

The next step in android development is to jump start by installing the components needed for the development.
This is the guide for installation although the android developers website provide much help for newbie developers,I will try with some screen shots and some solution for common errors during the installation.

Step 1 – Check basic requirements

what will you need ?

Eclipse IDE

Download Eclipse IDE from http://www.eclipse.org/downloads/ , select the java developers package or java EE developer package.You will get an zip file after downloading,Extract it to some location in your local drives.[ Do Extract the package and dont run the application as is in zip file ]

Java Developers Kit(JDK)

Download JDK 5 or 6 from http://java.sun.com/javase/downloads/index.jsp and complete the installation.

Step 2 – Installing Android development tool (ADT) for eclipse IDE

You have to install the ADT plugin to your Eclipse IDE inorder to develop android applications.You cannot directly download this ADT plugin,you can only download through the IDE interface.

Now run the Eclipse application and select Help > Install New Software.

In the Available Software dialog box, click Add

Provide a name for your remote site ex: Android plugin

In the Location field, enter the URL:  http://dl-ssl.google.com/android/eclipse/

[I am using http instead of https to avoid the “Failed to fetch” error.]

Now you will see a window like shown below,check the developer tools check box to select DDMS and development tools.click Next

click Next and accept the terms and conditions and click Finish.

Step – 3 Install the android Software development Kit(SDK)

Download the android SDK for windows,Mac and linux and extract to a location and run SDK Setup.exe [ Location of this SDK setup is to be

After some moments android SDK and AVD manager will start and you will be prompted to select the packages you wish to install,select as per your needs but minimum you have to select one platform ex- android  2.2, android 2.1 etc

Then click install selected

wait for the installation to complete.[Here I have selected SDK API,documentation,Platform and samples.

Step 4 – Setting up Android Virtual Device (AVD )

Android virtual device is the emulator that provides the virtual output for our applications.

In Android SDK and AVD Manager go to Virtual devices and select-> New

provide the name of the virtual device and select target to your installed platform.here I have installed android 2.2.If it can’t able to select the target then you didn’t installed any android platform packages.

Leave the other settings as is [ This setting is used for emulator configuration] click create AVD and OK

Step 5 – Configuring Eclipse ADT

Before starting to develop applications,you need to configure eclipse ADT plugin to properly work with SDK.

Open Eclipse IDE and click window then preferences and select Android in the left pane.

Now click browse and select the path where the android SDK is extracted in step 3 click apply and OK.If selected correctly the target name will be displayed in the window.If not selected the target name won’t be displayed.

Step 6 – Starting an android project

The trouble some part is over.Now click file-> New->Project in Eclipse

Select Android->Android project

Select

• Project name: HelloAndroid
• Application name: Hello, Android
• Package name: com.example.helloandroid
• Create Activity: HelloAndroid

click finish.

Now the application is ready,Your Android project is now ready. Open the 

file, located inside HelloAndroid > src > com.example.helloandroid

Change the code to

package com.example.helloandroid;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class HelloAndroid extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       TextView tv = new TextView(this);
       tv.setText("Hello, Android");
       setContentView(tv);
   }
}

Step 7 – Run your first mobile application

Select run->run->android application

The android emulator will show up.It will take some time for the dive to boot up for first time.

Finally Hello world  application is executed on the AVD.

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See also :Android 3.0 Honeycomb demo by Google-Full video on new features

Developer’s Link

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

Eclipse ADT