<RelativeLayout xmlns:android="http://schemas.android.
com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="50dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="10dp"
tools:context="com.infotech.safa.myapplication1.MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginTop="37dp"
android:text="First Number"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/txtB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_below="@+id/textView2"
android:ems="10"
android:inputType="numberDecimal" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtA"
android:layout_below="@+id/txtA"
android:layout_marginTop="15dp"
android:text="Second Number"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/txtA"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:ems="10"
android:inputType="numberDecimal" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtB"
android:layout_below="@+id/txtB"
android:layout_marginTop="28dp"
android:text="Result"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/txtRes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView3"
android:layout_below="@+id/textView3"
android:ems="10"
android:inputType="numberDecimal" >
<requestFocus />
</EditText>
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/txtRes"
android:layout_centerHorizontal="true"
android:layout_marginTop="22dp"
android:onClick="onClk"
android:text="Addition" />
</RelativeLayout>
package com.infotech.safa.myapplication1;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
EditText txt1,txt2,txt3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txt1=(EditText) findViewById(R.id.txtA);
txt2=(EditText) findViewById(R.id.txtB);
txt3=(EditText) findViewById(R.id.txtRes);
public void onClk(View v){
double a,b,c;
a=Double.parseDouble(txt1.getText().toString());
b=Double.parseDouble(txt2.getText().toString());
c=a+b;
txt3.setText(String.valueOf(c));
}
