To develop a program to create a simple calculator only to perform addition using Android Studio.
Android Studio(Min. required Artic Fox)
Step 1: Open Android Studio and then click on File -> New -> New project.
Step 2: Then type the Application name as SMSIntent and click Next.
Step 3: Select the Minimum SDK below and click Next.
Step 4: Then select the Empty Activity and click Next. Finally, click Finish.
Step 5: Design layout in activity_main.xml.
Step 6: Perform the Calculator Operation(to add) in MainActivity.java
Step 7: Save and run the application.
Program to create simple calculator to perform only addition using Android Studio.
Developed by: DEEPAK RAJ S
RegisterNumber: 212222240023
MainActivity.java:
package com.example.workshop;
import androidx.appcompat.app.AppCompatActivity;
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;
import android.widget.Toast;
import android.os.Bundle;
import android.os.Bundle;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
EditText e1, e2;
TextView t1;
int num1, num2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public boolean getNumbers() {
e1 = (EditText) findViewById(R.id.num1);
e2 = (EditText) findViewById(R.id.num2);
t1 = (TextView) findViewById(R.id.result);
String s1 = e1.getText().toString();
String s2 = e2.getText().toString();
if ((s1.equals(null) && s2.equals(null))
|| (s1.equals("") && s2.equals(""))) {
String result = "Please enter a value";
t1.setText(result);
return false;
} else {
num1 = Integer.parseInt(s1);
num2 = Integer.parseInt(s2);
}
return true;
}
public void doSum(View v) {
if (getNumbers()) {
int sum = num1 + num2;
t1.setText("Result "+"= "+Integer.toString(sum));
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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"
android:background="@color/white"
tools:context=".MainActivity">
<TextView
android:layout_width="194dp"
android:layout_height="43dp"
android:layout_marginStart="114dp"
android:layout_marginLeft="114dp"
android:layout_marginTop="58dp"
android:layout_marginEnd="103dp"
android:layout_marginRight="103dp"
android:layout_marginBottom="502dp"
android:scrollbarSize="30dp"
android:text="Addition-Calc"
android:textAppearance="@style/TextAppearance.AppCompat.Body1"
android:textSize="30dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/num1"
android:layout_width="364dp"
android:layout_height="28dp"
android:layout_marginStart="72dp"
android:layout_marginTop="70dp"
android:layout_marginEnd="71dp"
android:layout_marginBottom="416dp"
android:background="@android:color/white"
android:ems="10"
android:hint="Number-1"
android:inputType="number"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/num2"
android:layout_width="363dp"
android:layout_height="30dp"
android:layout_marginStart="72dp"
android:layout_marginTop="112dp"
android:layout_marginEnd="71dp"
android:layout_marginBottom="374dp"
android:background="@android:color/white"
android:ems="10"
android:hint="Number-2"
android:inputType="number"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/result"
android:layout_width="356dp"
android:layout_height="71dp"
android:layout_marginStart="41dp"
android:layout_marginTop="151dp"
android:layout_marginEnd="48dp"
android:layout_marginBottom="287dp"
android:background="@android:color/white"
android:text="Result"
android:textColorLink="#673AB7"
android:textSize="25sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/sum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="292dp"
android:layout_marginEnd="307dp"
android:layout_marginBottom="263dp"
android:backgroundTint="@android:color/holo_green_light"
android:onClick="doSum"
android:text="Add"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Thus a Simple Android Application to create a calculator only to perform addition operation using Android Studio was developed and executed successfully.