Dr. Ramkumar Lakshminarayanan article published in Tamil Computer Magazine. The content is about creating sample Android Application.

1. ºîL™ ݇†ó£Œ† Šó£ªü‚†®¬ù
à¼õ£‚°õ File->New Project-
>Android Project AO‚ ªêŒ»ƒèœ. (ðì‹-1).
AO‚ ªêŒî¾ì¡ ¹Fò ݇†ó£Œ† Šó£
ªü‚† à¼õ£‚°õîŸè£ù F¬ó «î£¡Á‹.
AO‚ ªêŒî£™ Æ
ì™ ªêò™ð£†®Ÿ
è£ù F¬ó‚°
ªê™ô «õ‡´‹. -
ð†ì¬ù AO‚
ªêŒî£™ èNˆî™
ªêò™ð£†®Ÿè£ù
F¬ó‚° ªê™ô
«õ‡´‹.*ð†ì¬ù
AO‚ ªêŒî£™
ªð¼‚è™ ªêò™
𣆮Ÿè£ù F¬ó
‚° ªê™ô «õ‡
´‹. /ð†ì¬ù
AO‚ ªêŒî£™ õ°ˆî™ ªêò™ð£†®Ÿè£ù
F¬ó‚° ªê™ô «õ‡´‹. End ð†ì¬ù AO‚
ÜŠO«èû¡ º®¾‚° õó«õ‡´‹ (ðì‹4).
src->layout->main.xml â¡ø ç¬ðL¬ù «î˜‰
ªî´ƒèœ. Þ‰î F¬óJ™ Graphical Layout
ñŸÁ‹ main.xml â¡Á Þó‡´ HK¾èœ
àœ÷ù. Graphical Layout ðò¡ð´ˆF ïñ‚°
«î¬õò£ù º¡F¬ó ܬñŠH¬ù à¼õ£‚è
º®»‹ (ðì‹ 5). â‚vâ‹â™ ðò¡ð´ˆF»‹
ÜŠO«èû¡ à¼õ£‚°‹ º¬ø
Þ‰î ꣡P™ Project name: arithmatic â¡Á
ªè£´ˆ¶œ«÷£‹. Build TargetJ¬ù Android
2.2 â¡Á «î˜‰ªî´‚è «õ‡´‹. Package
nameâ¡ðF™ com.tc.arithmaticâ¡Á ªè£´‚è
«õ‡´‹.
 à¼õ£‚°‹ ÜŠO«èû¡ å«ó ܬñŠ
H™ Þ¼ŠðîŸè£è Þ‰î º¬ø¬ò ðò¡ð´ˆ¶
A«ø£‹ (ðì‹ 2).
«î¬õò£ù îèõ¬ô ªè£´ˆîH¡¹ finish
ð†ì¬ù AO‚ ªêŒò «õ‡´‹.
arithmatic â¡ø Šó£ªü‚† à¼õ£‚èŠð†
®¼‚°‹.
arithmatic Šó£ªü‚†®¬ù Þó†¬ì AO‚
ªêŒî£™, Ü‰î Šó£ªü‚†®™ àœ÷ ñŸø
ç«ð£™ì˜èœ ñŸÁ‹ ç¬ð™è¬÷ ðŸP ÜP
‰¶ ªè£œ÷ º®»‹. ܬõ src, gen, Android
2.2, assets, res «ð£¡ø ç«ð£™ì˜èÀ‹ ñŸ
Á‹ AndroidManifest.xml, default.properties, pro
guard.cfg â¡ø ç¬ð™è¬÷ ªè£‡®¼‚°‹.
ÜŠO«èû¡ à¼õ£‚°õ res ñŸÁ‹ src
ç«ð£™ì˜èœ ðò¡ð´A¡øù. ñŸø ç«ð£™ì
K™ àœ÷ ç¬ð™èO¡ îèõ™èœ res ç«ð£™
ìK™ àœ÷ ç¬ð™ ðò¡ð£†®Ÿ° ãŸð¾‹,
src ç«ð£™ìK™ àœ÷ ç¬ð™ ðò¡ð´ˆ¶‹
º¬ø‚° ãŸð¾‹ ñ£Áð´‹ (ðì‹ 3).
 à¼õ£‚芫𣰋 ÜŠO«èûQ™
ªñJ¡ F¬ó Þ¼‚°‹. ܉î F¬óJ™ +,-,/,*
-‚è£ù ð†ì¡èœ Þ¼‚°‹. + ð†ì¬ù
(ðì‹-1)
(ðì‹-2)
(ðì‹-3)

2. Ý¡†ó£Œ´ -2
Þ󣋰ñ£˜ ªô†²Iï£ó£òí¡
03
º¡F¬ó ܬñŠH¬ù
à¼õ£‚è º®»‹. Main
Menu F¬ó¬ò à¼õ£‚°
õîŸè£ù ܬñŠH¬ù
𣘊«ð£‹ (Þƒ° content
1.txt â¡ø ç¬ðL¬ù
ðò¡ð´ˆî «õ‡´‹.
裇è Gó™ 1) Þ‰î ꣡
P™<Linear Layout> ñŸ
Á‹ <Table Layout> ðò¡
ð´ˆF»œ«÷£‹. <Linear
Layout>Íô‹ÝŠªü‚†´
è¬÷ õK¬êò£è ܬñ‚è
«õ‡´‹. <Table Layout>
Íô‹ «ìHœ «ð£¡ø ܬñŠH™ F¬óJ™
ܬñ‚è º®»‹. îèõ¬ô F¬óJ™ 裇HŠ
ð Text View ðò¡ð´Aø¶.
å¼ ßõ¡´ì¡ (Event) ÝŠªü‚®¬ù
ðò¡ð´ˆ¶õ id ðò¡ð´Aø¶. ꣡ø£è,
Þ‰î ðò¡ð£†®™, ºî™ ð†ìQ¡ id-@+id/
button1, Þó‡ì£õ¶ ð†ìQ¡ id-@+id/
button2,Í¡ø£õ¶ð†ìQ¡id-@+id/button3,
è£õ¶ ð†ìQ¡ id-@+id/button4, ä‰î£
õ¶ ð†ìQ¡ id-@+id/button5. Ü´ˆîî£è,
Æ콂è£ù F¬ó à¼õ£‚°õîŸè£ù õN
º¬ø¬ò 𣘊«ð£‹.
Layout->New->Android XML File â¡ð¬î
AO‚ ªêŒî¾ì¡ New Android XML File â¡ø
F¬ó «î£¡Á‹. Þ‰î F¬óJ™ File â¡ðF™
addition.xml â¡Á ªè£´‚è «õ‡´‹.
What type of resource would you like to
create? â¡ðF™ Layout â¡ðî¬ù «î˜‰ªî
´‚è «õ‡´‹. H¡ù˜ Finish ð†ì¬ù AO‚
ªêŒò «õ‡´‹. (ðì‹-6). Þ«î º¬øJ¬ù
ðò¡ð´ˆF subtraction.xml, division.xml, mul
tiplication.xml â¡ø «ôܾ† ç¬ð™è¬÷ à¼
õ£‚è «õ‡´‹.
Ü´ˆîî£èsrc->com.tc.arithmaticâ¡ðî¬ù
AO‚ ªêŒî£™ "ArithmaticActivity.java" â¡ø
ç¬ð™ F¬óJ™ «î£¡Á‹. Þ¶«õ Activity
ç¬ðô£°‹.
嚪õ£¼ «ôܾ† ç¬ðLŸ°‹ å¼
ç¬ðL¬ù à¼õ£‚è «õ‡´‹.
main.xml -‚è£ù Ý‚®M†® Activity ç¬ð™
mainmenujavaâ¡ð‹. (content2.txt)裇è
Gó™2. ÞF™ setcontentview(R.Layout.main)
â¡ø õK ðò¡ð´Aø¶.
Þî¬ùŠ «ð£¡«ø 
à¼õ£‚A»œ÷ addition.
xml-‚° additionActivity.
java â¡ø ç¬ð½‹, sub
traction.xmlŸ°subtraction
Activity.java â¡ø
ç¬ð½‹, multiplication.
xmlŸ° multiplicationActi
vity.java â¡ø ç¬ð½‹,
division.xmlŸ° divisionActi
vity.java. ݇†ó£Œ´
Šó£ªü‚† ªî£ìƒAò¾
ì«ù«ò main.xmlŸè£ù
(ðì‹-4)
(ðì‹-5)
(ðì‹-6)

3. Content1.txt
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/a
pk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center">
<TextView
android:textAppearance="?android:attr/textApp
earanceSmall"
android:layout_height="wrap_content"
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:text="Main Menu"
android:textSize="55dp"
android:gravity="center"></TextView>
<TableLayout
android:id="@+id/tableLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:textSize="35dp"></Button>
<TextView
android:textAppearance="?android:attr/textApp
earanceMedium"
android:id="@+id/textView1"
android:layout_height="wrap_content"
android:text="Addition"
android:layout_width="fill_parent"></TextVi
ew>
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:textSize="35dp"></Button>
<TextView
android:textAppearance="?android:attr/textAp
pearanceMedium"
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Subtraction"></TextView>
</TableRow>
<TableRow
android:id="@+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="X"
android:textSize="35dp"></Button>
<TextView
android:textAppearance="?android:attr/textAp
pearanceMedium"
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Multiplication"></TextView>
</TableRow>
<TableRow
android:id="@+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="/"
android:textSize="35dp"></Button>
<TextView
android:textAppearance="?android:attr/textAp
pearanceMedium"
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Division"></TextView>
</TableRow>
</TableLayout>
<Button android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End"></Button>
</LinearLayout>

4. Content2.txt
package com.harsha.world;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;
public class mainmenu extends Activity
implements OnClickListener {
Button add,sub,mul,div,endit;
Intent intent = null;
@Override
protected void onCreate(Bundle
savedInstanceState) {
// TODO Auto-generated method
stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
add =
(Button)findViewById(R.id.button1);
sub =
(Button)findViewById(R.id.button2);
mul =
(Button)findViewById(R.id.button3);
div =
(Button)findViewById(R.id.button4);
endit =
(Button)findViewById(R.id.button5);
add.setOnClickListener(this);
sub.setOnClickListener(this);
mul.setOnClickListener(this);
div.setOnClickListener(this);
endit.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method
stub
if(v==add)
{
intent = new
Intent(mainmenu.this,additionActivity.clas
s);
}
if(v==sub)
{
intent = new
Intent(mainmenu.this,subtractionActivity.cl
ass);
}
if(v==mul)
{
Toast.makeText(v.getContext(), "Hello!!
Multiplication Clicked",
Toast.LENGTH_SHORT).show();
intent = new
Intent(mainmenu.this,multiplicationActivity
.class);
}
if(v==div)
{
Toast.makeText(v.getContext(), "Hello!!
Division Clicked",
Toast.LENGTH_SHORT).show();
intent = new
Intent(mainmenu.this,divisionActivity.clas
s);
}
if(v==endit)
{
finish();
}
startActivity(intent);
}
}
- ªî£ì¼‹
Ý‚®M†® ç¬ð™ à¼õ£‚èŠð†®¼‚°‹,
܉î ç¬ðL¬ù 裊H ªêŒ¶ ñŸø ç¬ð™è
¬÷ à¼õ£‚èô£‹.
«ô-ܾ†®™ ð†ì¬ù ü£õ£ ç¬ðL™
ðò¡ð´ˆ¶õFindViewById()ðò¡ð´Aø¶.
꣡ø£è, add=(Button)FindViewById(R.id.but
ton1);
Þî¬ù «ð£¡«ø sub, mul,div ñŸÁ‹ endit
ð†ì¡èÀ‹ ðò¡ð´ˆîŠð†´œ÷ù.
ð†ì¬ù AO‚ ªêŒî¾ì¡ ñŸªø£¼
F¬ó‚° ªê™õ setonclickListener() ðò¡
ð´Aø¶. ꣡ø£è, add.setonclicklistener(this);
Þî¬ù «ð£¡«ø sub, mul,div ñŸÁ‹ endit
ð†ì¡èÀ‚°‹ ðò¡ð´ˆîŠð†´œ÷¶.
(Public void onclidk (view) {} Íô‹ AO‚ ªêŒ
 ï¬ìªðÁ‹ ªêò™è¬÷ õ®õ¬ñ‚è
º®»‹. Üî¬ù ðŸP MKõ£è Ü´ˆî ÞîN™
𣘊«ð£‹.