Write an android application for calculating using simple calculator.

/*******************************************************************************************

Program Name: Write an android application for calculating using simple calculator.

Author: sujith

Date: 10/9/2016

*******************************************************************************************/

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.sujithbaby.calci2">

<application

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:supportsRtl="true"

android:theme="@style/AppTheme">

<activity android:name=".MainActivity">

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

</application>

</manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<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="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.example.sujithbaby.calci2.MainActivity">

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/e1"

android:textSize="18dp"

android:textStyle="bold"

android:id="@+id/textView"

/>

<EditText

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/editText"

android:inputType="numberDecimal"

android:layout_below="@+id/textView"

/>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/e2"

android:textSize="18dp"

android:textStyle="bold"

android:id="@+id/textView2"

android:layout_below="@+id/editText"

/>

<EditText

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/editText2"

android:inputType="numberDecimal"

android:layout_below="@+id/textView2"

/>

<LinearLayout

android:id="@+id/linear2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/editText2"

>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="+"

android:id="@+id/add" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="-"

android:id="@+id/sub" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="*"

android:id="@+id/multi" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="/"

android:id="@+id/divi" />

</LinearLayout>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:paddingTop="10dp"

android:id="@+id/output"

android:text=""

android:layout_below="@+id/linear2"

/>

</RelativeLayout>

MainActivity.java

package com.example.sujithbaby.calci2;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private EditText fnum1,fnum2;

private Button add,sub,multi,div;

private TextView txtResult;

private double num1,num2,result;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

fnum1=(EditText)findViewById(R.id.editText);

fnum2=(EditText)findViewById(R.id.editText2);

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

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

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

div=(Button)findViewById(R.id.divi);

txtResult=(TextView)findViewById(R.id.output);

add.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

num1=Double.parseDouble(fnum1.getText().toString());

num2=Double.parseDouble(fnum2.getText().toString());

result=num1+num2;

txtResult.setText(Double.toString(result));

}

});

sub.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

num1=Double.parseDouble(fnum1.getText().toString());

num2=Double.parseDouble(fnum2.getText().toString());

result=num1-num2;

txtResult.setText(Double.toString(result));

}

});

multi.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

num1=Double.parseDouble(fnum1.getText().toString());

num2=Double.parseDouble(fnum2.getText().toString());

result=num1*num2;

txtResult.setText(Double.toString(result));

}

});

div.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

num1=Double.parseDouble(fnum1.getText().toString());

num2=Double.parseDouble(fnum2.getText().toString());

result=num1/num2;

txtResult.setText(Double.toString(result));

}

});

}

}

Strings.xml

<resources>

<string name="app_name">simple calculator</string>

<string name="e1">Enter the first number</string>

<string name="e2">Enter the second number</string>

</resources>

OUTPUT