Android simple application by adding 2 values

ok this is csharp blog and quit inactive for a long time i have been not posting any thing about c-sharp and that is because i don't much work to do on c-sharp for. but main purpose of this is blog is online codes for programming whether its c-sharp or java or android.
so today i am going to post the complete code of a little android test application.

XML

<?xml version="1.0" encoding="utf-8"?>
    <AbsoluteLayout android:id="@+id/widget0"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <TextView android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="ADDITION OF NUMBERS"
     android:id="@+id/textView1"
     android:layout_x="73dip"
     android:layout_y="28dip"></TextView>
    <TextView android:layout_width="wrap_content"
    android:layout_x="36dip"
    android:layout_height="wrap_content"
    android:text="First Amount"
    android:id="@+id/textView2"
    android:layout_y="80dip"></TextView>
    <EditText android:text=""
    android:layout_width="wrap_content"
    android:layout_x="172dip"
    android:id="@+id/amount1"
    android:layout_height="wrap_content"
    android:layout_y="62dip"></EditText>
    <TextView android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Second Amount"
    android:id="@+id/textView3"
    android:layout_x="36dip"
    android:layout_y="169dip"></TextView>
    <EditText android:text=""
    android:layout_width="wrap_content"
    android:layout_x="169dip"
    android:id="@+id/amount2"
    android:layout_height="wrap_content"
    android:layout_y="152dip"></EditText>
    <Button android:layout_width="wrap_content"
    android:id="@+id/calculate"
    android:layout_x="41dip"
    android:layout_height="wrap_content"
    android:text="Calculate"
    android:layout_y="232dip"></Button>
    <EditText android:text=""
    android:layout_width="wrap_content"
    android:layout_x="172dip"
    android:id="@+id/tt"
    android:layout_height="wrap_content"
    android:layout_y="232dip"></EditText>
    </AbsoluteLayout>

Main Activity

package com.example.test;

import android.os.Bundle;

import android.app.Activity;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends Activity {

EditText amount1;

 EditText amount2;

 TextView tt;

 Button calculate;

 double x=0;

 double y=0;

 double z=0;

 /** Called when the activity is first created. */

 @Override

 public void onCreate(Bundle savedInstanceState)

 {

     super.onCreate(savedInstanceState);

     setContentView(R.layout.activity_main);

     initControls();

 }

 private void initControls()

 {

     amount1=(EditText)findViewById(R.id.amount1);

     amount2=(EditText)findViewById(R.id.amount2);

     tt=(TextView)findViewById(R.id.tt);

     calculate=(Button)findViewById(R.id.calculate);

     calculate.setOnClickListener(new Button.OnClickListener(){public void onClick

     (View  v) { calculate();}});

 }

 private void calculate()

 {

     x=Double.parseDouble(amount1.getText().toString());

     y=Double.parseDouble(amount2.getText().toString());

     z=x+y;

     tt.setText(Double.toString(z));

     calculate.setText(Double.toString(z));

 }

}