To develop a program to develop a simple calculator in Android Studio.
Android Studio(Latest Version)
Step 1: Open Android Stdio and then click on File -> New -> New project.
Step 2: Then type the Application name as calculator and click Next.
Step 3: Then select the Minimum SDK as shown below and click Next.
Step 4: Then select the Empty Activity and click Next. Finally click Finish.
Step 5: Design layout using UI components in activity_main.xml.
Step 6: Display the calculator operation in MainActivity file.
Step 7: Save and run the application.
/*
Program to print the text “calculator operation”.
Developed by: R.HEMA JAI SURIYA
Registeration Number : 212221040054
*/
<?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:id="@+id/relative1"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/edt1"
android:layout_width="match_parent"
android:layout_height="120dp"
android:fontFamily="sans-serif-medium"
android:textAlignment="center"
android:textSize="20sp"
android:textStyle="bold" />
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/edt1"
android:layout_alignEnd="@+id/button4"
android:layout_alignRight="@+id/button4"
android:layout_marginTop="127dp"
android:layout_marginEnd="-1dp"
android:layout_marginRight="-1dp"
android:backgroundTint="#CD225C"
android:backgroundTintMode="src_atop"
android:text="1"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/button1"
android:layout_toStartOf="@+id/button3"
android:layout_toLeftOf="@+id/button3"
android:text="2"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/button2"
android:layout_centerHorizontal="true"
android:text="3"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button1"
android:layout_toLeftOf="@+id/button2"
android:text="4"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignStart="@+id/button2"
android:layout_alignLeft="@+id/button2"
android:layout_alignBottom="@+id/button4"
android:text="5"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button6"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button3"
android:layout_alignStart="@+id/button3"
android:layout_alignLeft="@+id/button3"
android:text="6"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button4"
android:layout_toLeftOf="@+id/button2"
android:text="7"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button8"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button5"
android:layout_alignStart="@+id/button5"
android:layout_alignLeft="@+id/button5"
android:text="8"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button9"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button6"
android:layout_alignStart="@+id/button6"
android:layout_alignLeft="@+id/button6"
android:text="9"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/buttonadd"
style="?android:attr/buttonStyleSmall"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/button3"
android:layout_alignEnd="@+id/edt1"
android:layout_alignRight="@+id/edt1"
android:layout_marginStart="46dp"
android:layout_marginLeft="37dp"
android:layout_marginTop="3dp"
android:layout_marginEnd="61dp"
android:layout_marginRight="61dp"
android:layout_toRightOf="@+id/button3"
android:text="+"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/buttonsub"
style="?android:attr/buttonStyleSmall"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:layout_below="@+id/buttonadd"
android:layout_alignStart="@+id/buttonadd"
android:layout_alignLeft="@+id/buttonadd"
android:layout_alignEnd="@+id/buttonadd"
android:layout_alignRight="@+id/buttonadd"
android:layout_marginStart="-1dp"
android:layout_marginLeft="-1dp"
android:layout_marginTop="0dp"
android:layout_marginEnd="2dp"
android:layout_marginRight="2dp"
android:text="-"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/buttonmul"
style="?android:attr/buttonStyleSmall"
android:layout_width="72dp"
android:layout_height="wrap_content"
android:layout_below="@+id/buttonsub"
android:layout_alignStart="@+id/buttonsub"
android:layout_alignLeft="@+id/buttonsub"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_marginStart="0dp"
android:layout_marginLeft="0dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="60dp"
android:layout_marginRight="60dp"
android:text="*"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button10"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button7"
android:layout_toLeftOf="@+id/button2"
android:text="."
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/button0"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button8"
android:layout_alignStart="@+id/button8"
android:layout_alignLeft="@+id/button8"
android:text="0"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/buttonC"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button9"
android:layout_alignStart="@+id/button9"
android:layout_alignLeft="@+id/button9"
android:text="C"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/buttondiv"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/buttonmul"
android:layout_alignStart="@+id/buttonmul"
android:layout_alignLeft="@+id/buttonmul"
android:layout_alignEnd="@+id/buttonmul"
android:layout_alignRight="@+id/buttonmul"
android:text="/"
android:textSize="16sp"
android:textStyle="bold" />
<Button
android:id="@+id/buttoneql"
android:layout_width="302dp"
android:layout_height="wrap_content"
android:layout_below="@+id/button0"
android:layout_alignStart="@+id/button10"
android:layout_alignLeft="@+id/button10"
android:layout_alignEnd="@+id/buttondiv"
android:layout_alignRight="@+id/buttondiv"
android:layout_marginStart="-1dp"
android:layout_marginLeft="-1dp"
android:layout_marginTop="39dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:text="="
android:textSize="20sp"
android:textStyle="bold" />
</RelativeLayout>
package com.example.simplecalculator;
import androidx.appcompat.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 {
Button button0, button1, button2, button3, button4, button5, button6,
button7, button8, button9, buttonAdd, buttonSub, buttonDivision,
buttonMul, button10, buttonC, buttonEqual;
EditText editText;
float mValueOne, mValueTwo;
boolean Addition, Subtract, Multiplication, Division;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button0 = (Button) findViewById(R.id.button0);
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
button3 = (Button) findViewById(R.id.button3);
button4 = (Button) findViewById(R.id.button4);
button5 = (Button) findViewById(R.id.button5);
button6 = (Button) findViewById(R.id.button6);
button7 = (Button) findViewById(R.id.button7);
button8 = (Button) findViewById(R.id.button8);
button9 = (Button) findViewById(R.id.button9);
button10 = (Button) findViewById(R.id.button10);
buttonAdd = (Button) findViewById(R.id.buttonadd);
buttonSub = (Button) findViewById(R.id.buttonsub);
buttonMul = (Button) findViewById(R.id.buttonmul);
buttonDivision = (Button) findViewById(R.id.buttondiv);
buttonC = (Button) findViewById(R.id.buttonC);
buttonEqual = (Button) findViewById(R.id.buttoneql);
editText = (EditText) findViewById(R.id.edt1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "1");
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "2");
}
});
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "3");
}
});
button4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "4");
}
});
button5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "5");
}
});
button6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "6");
}
});
button7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "7");
}
});
button8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "8");
}
});
button9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "9");
}
});
button0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + "0");
}
});
buttonAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (editText == null) {
editText.setText("");
} else {
mValueOne = Float.parseFloat(editText.getText() + "");
Addition = true;
editText.setText(null);
}
}
});
buttonSub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(editText.getText() + "");
Subtract = true;
editText.setText(null);
}
});
buttonMul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(editText.getText() + "");
Multiplication = true;
editText.setText(null);
}
});
buttonDivision.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueOne = Float.parseFloat(editText.getText() + "");
Division = true;
editText.setText(null);
}
});
buttonEqual.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mValueTwo = Float.parseFloat(editText.getText() + "");
if (Addition == true) {
editText.setText(mValueOne + mValueTwo + "");
Addition = false;
}
if (Subtract == true) {
editText.setText(mValueOne - mValueTwo + "");
Subtract = false;
}
if (Multiplication == true) {
editText.setText(mValueOne * mValueTwo + "");
Multiplication = false;
}
if (Division == true) {
editText.setText(mValueOne / mValueTwo + "");
Division = false;
}
}
});
buttonC.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText("");
}
});
button10.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
editText.setText(editText.getText() + ".");
}
});
}
}
Thus a Simple Android Application develop a program to create simple calculator in Android Studio is developed and executed successfully.
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