Getting Started with Android Programming

Here are some pre-requisites that are required for running an android project:

    Android-SDK
    ADT
    Eclipse
    Basic Java Knowledge

In this project we will be creating a TOST(a popup message) to display "Hello World".
One of the most easy part in android, you may look at the code below:

   Toast.makeText(--APP CONTEXT--, --Text-- , --Length--).show();

The above code will display a small popup message on to the screen.
You first need to create an Activity and a class associated to the activity, So on create of this method you may write the Tost code.

package com.example.demoui;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import android.support.v4.app.NavUtils;

public class NewUI extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_new_ui);
        Toast.makeText(getApplicationContext(), "Hello World", Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_new_ui, menu);
        return true;
    }    
}

Understand in detail about the function :

--App Context-- : The context of the Application/Activity.

--Text-- : The text your need to display on the screen.

--Length-- : For how long the text should be displayed (Toast.LENGTH_SHORT, Toast.LENGTH_LONG).

Thats it guys ... you have started writing code in android. Soon will post how to setup development environment for android.