Android calculator app

In ✋5 steps Within ✋5 minutes

Requirements:

1.Android Studio

2.Java (Installed correctly)

3.Mainly a PC or a Laptop...😛

The sequence of steps:

Step 1: create a new project in Android Studio.

Step 2: keep XML and java file as it is.

Step 3: copy the XML code in activity_main.xml

Step 4: copy the java code in MainActivity.java

Step 5: click RUN(Play Button)and run the app using the emulator or your smartphone.

***Screenshots are provided below the code.

XML File :

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

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

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="com.example.rishwibinnu.caluculator.MainActivity">

<Button

android:id="@+id/btn9"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentStart="true"

android:layout_centerVertical="true"

android:layout_marginLeft="14dp"

android:layout_marginStart="14dp"

android:text="9" />

<Button

android:id="@+id/btn8"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="8"

android:layout_alignBaseline="@+id/btn9"

android:layout_alignBottom="@+id/btn9"

android:layout_toRightOf="@+id/btn9"

android:layout_toEndOf="@+id/btn9" />

<Button

android:id="@+id/btn7"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="7"

android:layout_alignBaseline="@+id/btn8"

android:layout_alignBottom="@+id/btn8"

android:layout_toRightOf="@+id/btn8"

android:layout_toEndOf="@+id/btn8" />

<Button

android:id="@+id/btn6"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn9"

android:layout_alignStart="@+id/btn9"

android:layout_below="@+id/btn9"

android:layout_marginTop="10dp"

android:text="6" />

<Button

android:id="@+id/btn5"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn8"

android:layout_alignStart="@+id/btn8"

android:layout_alignTop="@+id/btn6"

android:text="5" />

<Button

android:id="@+id/btn4"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="4"

android:layout_alignBaseline="@+id/btn5"

android:layout_alignBottom="@+id/btn5"

android:layout_alignLeft="@+id/btn7"

android:layout_alignStart="@+id/btn7" />

<Button

android:id="@+id/btn3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn6"

android:layout_alignStart="@+id/btn6"

android:layout_below="@+id/btn6"

android:layout_marginTop="14dp"

android:text="3" />

<Button

android:id="@+id/btn2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn5"

android:layout_alignStart="@+id/btn5"

android:layout_alignTop="@+id/btn3"

android:text="2" />

<Button

android:id="@+id/btn1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn4"

android:layout_alignStart="@+id/btn4"

android:layout_alignTop="@+id/btn2"

android:text="1" />

<Button

android:id="@+id/btnclear"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn3"

android:layout_alignStart="@+id/btn3"

android:layout_below="@+id/btn3"

android:layout_marginTop="17dp"

android:text="clear" />

<Button

android:id="@+id/btn0"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBottom="@+id/btnclear"

android:layout_alignLeft="@+id/btn2"

android:layout_alignStart="@+id/btn2"

android:text="0" />

<Button

android:id="@+id/btnequal"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn1"

android:layout_alignStart="@+id/btn1"

android:layout_alignTop="@+id/btn0"

android:text="=" />

<Button

android:id="@+id/btnadd"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBottom="@+id/btn7"

android:layout_toEndOf="@+id/btn7"

android:layout_toRightOf="@+id/btn7"

android:text="+" />

<Button

android:id="@+id/btnsub"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignTop="@+id/btn4"

android:layout_toEndOf="@+id/btn4"

android:layout_toRightOf="@+id/btn4"

android:text="-" />

<Button

android:id="@+id/btnmul"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBaseline="@+id/btn1"

android:layout_alignBottom="@+id/btn1"

android:layout_toEndOf="@+id/btn1"

android:layout_toRightOf="@+id/btn1"

android:text="*" />

<Button

android:id="@+id/btndiv"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="/"

android:layout_alignBaseline="@+id/btnequal"

android:layout_alignBottom="@+id/btnequal"

android:layout_toRightOf="@+id/btnequal"

android:layout_toEndOf="@+id/btnequal" />

<TextView

android:id="@+id/tvcontrol"

android:layout_width="200dp"

android:layout_height="30dp"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="37dp"

android:textSize="24sp" />

<TextView

android:id="@+id/tvresult"

android:layout_width="150dp"

android:layout_height="35dp"

android:layout_below="@+id/tvcontrol"

android:layout_centerHorizontal="true"

android:layout_marginTop="39dp"

android:textStyle="bold" />

</RelativeLayout>

Java File :

package com.example.rishwibinnu.caluculator;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import com.google.android.gms.ads.MobileAds;

public class MainActivity extends AppCompatActivity {

private Button one;

private Button two;

private Button three;

private Button four;

private Button five;

private Button six;

private Button seven;

private Button eight;

private Button nine;

private Button zero;

private Button add;

private Button sub;

private Button mul;

private Button div;

private Button equal;

private Button clear;

private TextView info;

private TextView result;

private final char ADDITION = '+';

private final char SUBTRACTION = '-';

private final char MULTIPLICATION = '*';

private final char DIVISION = '/';

private final char EQU = 0;

private double val1=Double.NaN;

private double val2;

private char ACTION;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

setupUIViews();

one.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "1");

}

});

two.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "2");

}

});

three.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "3");

}

});

four.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "4");

}

});

five.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "5");

}

});

six.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "6");

}

});

seven.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "7");

}

});

eight.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "8");

}

});

nine.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "9");

}

});

zero.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

info.setText(info.getText().toString() + "0");

}

});

add.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

MobileAds.initialize(MainActivity.this, "ca-app-pub-9449308388500357~2044595441");

compute();

ACTION = ADDITION;

result.setText(String.valueOf(val1) + "+");

info.setText(null);

}

});

sub.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

compute();

ACTION = SUBTRACTION;

result.setText(String.valueOf(val1) + "-");

info.setText(null);

}

});

mul.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

compute();

ACTION = MULTIPLICATION;

result.setText(String.valueOf(val1) + "*");

info.setText(null);

}

});

div.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

compute();

ACTION = DIVISION;

result.setText(String.valueOf(val1) + "/");

info.setText(null);

}

});

equal.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

compute();

ACTION = EQU;

result.setText(result.getText().toString() + String.valueOf(val2) + "=" + String.valueOf(val1));

info.setText(null);

}

});

clear.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

if(info.getText().length() > 0){

CharSequence name = info.getText().toString();

info.setText(name.subSequence(0, name.length()-1));

}

else {

val1=Double.NaN;

val2=Double.NaN;

info.setText(null);

result.setText(null);

}

});

}

private void setupUIViews()

{

one = (Button)findViewById(R.id.btn1);

two = (Button)findViewById(R.id.btn2);

three = (Button)findViewById(R.id.btn3);

four = (Button)findViewById(R.id.btn4);

five = (Button)findViewById(R.id.btn5);

six = (Button)findViewById(R.id.btn6);

seven = (Button)findViewById(R.id.btn7);

eight = (Button)findViewById(R.id.btn8);

nine = (Button)findViewById(R.id.btn9);

zero = (Button)findViewById(R.id.btn0);

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

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

mul = (Button)findViewById(R.id.btnmul);

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

equal = (Button)findViewById(R.id.btnequal);

clear = (Button)findViewById(R.id.btnclear);

info = (TextView)findViewById(R.id.tvcontrol);

result = (TextView)findViewById(R.id.tvresult);

}

private void compute()

{

if(!Double.isNaN(val1)){

val2 = Double.parseDouble(info.getText().toString());

switch (ACTION){

case ADDITION:

val1 = val1 + val2;

break;

case SUBTRACTION:

val1 = val1 - val2;

break;

case MULTIPLICATION:

val1 = val1 * val2;

break;

case DIVISION:

val1 = val1 / val2;

break;

case EQU:

break;

}

else {

val1=Double.parseDouble(info.getText().toString());

}

Screenshots of the Calculator app:

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