Add Two Number Program app in Android Studio

The App look Like This…

Also Learn : Quotes app using android Studio

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<?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="#FFFFFF"
    tools:context=".MainActivity">

<TextView
android:id=”@+id/textView5″
android:layout_width=”304dp”
android:layout_height=”91dp”
android:layout_marginTop=”55dp”
android:background=”#FFFFFF”
android:fontFamily=”sans-serif-light”
android:foregroundGravity=”center”
android:gravity=”center”
android:shadowColor=”#E91E63″
android:text=”@string/add_two_numbers”
android:textColor=”#E91E63″
android:textSize=”36sp”
android:textStyle=”bold”
app:flow_horizontalAlign=”center”
app:layout_constraintEnd_toEndOf=”parent”
app:layout_constraintStart_toStartOf=”parent”
app:layout_constraintTop_toTopOf=”parent” />

<EditText
android:id=”@+id/etNum2″
android:layout_width=”247dp”
android:layout_height=”66dp”
android:layout_marginTop=”48dp”
android:ems=”10″
android:gravity=”center”
android:hint=”Second Number”
android:inputType=”number”
app:layout_constraintEnd_toEndOf=”parent”
app:layout_constraintStart_toStartOf=”parent”
app:layout_constraintTop_toBottomOf=”@+id/etNum1″ />

<EditText
android:id=”@+id/etNum1″
android:layout_width=”247dp”
android:layout_height=”66dp”
android:layout_marginTop=”56dp”
android:ems=”10″
android:gravity=”center”
android:hint=”First Number”
android:inputType=”number”
app:layout_constraintEnd_toEndOf=”parent”
app:layout_constraintHorizontal_bias=”0.463″
app:layout_constraintStart_toStartOf=”parent”
app:layout_constraintTop_toBottomOf=”@+id/textView5″ />

<Button
android:id=”@+id/btnadd”
android:layout_width=”234dp”
android:layout_height=”65dp”
android:layout_marginTop=”48dp”
android:text=”Add”
app:layout_constraintEnd_toEndOf=”parent”
app:layout_constraintStart_toStartOf=”parent”
app:layout_constraintTop_toBottomOf=”@+id/etNum2″ />

<TextView
android:id=”@+id/tvanswer”
android:layout_width=”271dp”
android:layout_height=”82dp”
android:layout_marginTop=”172dp”
android:layout_marginBottom=”164dp”
android:gravity=”center”
android:text=”Answer”
android:textSize=”36sp”
app:layout_constraintBottom_toBottomOf=”parent”
app:layout_constraintEnd_toEndOf=”parent”
app:layout_constraintHorizontal_bias=”0.497″

app:layout_constraintStart_toStartOf=”parent”
app:layout_constraintTop_toBottomOf=”@+id/btnadd”
app:layout_constraintVertical_bias=”0.742″ />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java
Copy all this code and paste it
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package com.example.add;

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 {
private EditText num1 ;
private EditText num2 ;
private Button add;
private TextView result;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

num1 = findViewById(R.id.etNum1);
num2 = findViewById(R.id.etNum2);
add = findViewById(R.id.btnadd);
result = findViewById(R.id.tvanswer);

add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

int number1 = Integer.parseInt(num1.getText().toString());
int number2 = Integer.parseInt(num2.getText().toString());
int sum = number1 + number2;
result.setText(“Answer is = “+ String.valueOf(sum));
}
});

}
}

string.xml
If you want to change app Name
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<resources>
    <string name="app_name">Add Two Number</string>
    <string name="add_two_numbers">Add Two Numbers</string>
</resources>

How to Change app icon

in short 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.add">

<

application
        android:allowBackup="true"
        android:icon="@mipmap/addicon"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/addicon"
        android:supportsRtl="true"
        android:theme="@style/Theme.Add">
        <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>