Sample Android Program to add two numbers

A program to demonstrate usage of EditText, Textview and Button widgets in android this program is very useful for beginners and give the basic overview on how to use the Api's, using Droiddraw i was able to design the User Interface with two textbox(EditText) and Label(TextView) and button as shown in below Pic

below is the XML for above UI generated from DroidDraw

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget35"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<EditText
android:id="@+id/txtbox1"
android:layout_width="145px"
android:layout_height="40px"
android:text="EditText"
android:textSize="18sp"
android:layout_x="75px"
android:layout_y="54px"
>
</EditText>
<EditText
android:id="@+id/txtbox2"
android:layout_width="144px"
android:layout_height="40px"
android:text="EditText"
android:textSize="18sp"
android:layout_x="75px"
android:layout_y="109px"
>
</EditText>
<Button
android:id="@+id/button1"
android:layout_width="106px"
android:layout_height="36px"
android:text="Button"
android:layout_x="88px"
android:layout_y="224px"
>
</Button>
<TextView
android:id="@+id/lbl1"
android:layout_width="141px"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_x="76px"
android:layout_y="166px"
>
</TextView>
</AbsoluteLayout>

and below is the Java Source code which contains the logic to add two numbers and the refrence to id of the controls can be found in above XML

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class fit extends Activity {
Button button1;
EditText txtbox1,txtbox2;
TextView tv;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtbox1= (EditText) findViewById(R.id.txtbox1);
button1 = (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.lbl1);
txtbox2= (EditText) findViewById(R.id.txtbox2);
button1.setOnClickListener(new clicker());
}
class clicker implements Button.OnClickListener
{
public void onClick(View v)
{
String a,b;
Integer vis;
a = txtbox1.getText().toString();
b = txtbox2.getText().toString();
vis = Integer.parseInt(a)+Integer.parseInt(b);
tv.setText(vis.toString());
}
}

}

in above code we have OnClickListener which is similar to ActionListener in java swing values are taken from the EditText(textbox) and added and the result is showed in TextView(label).