Aritmatika

activitymain

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:orientation="vertical"
        app:layout_constraintTop_toTopOf="parent"
        android:padding="10dp">
        <EditText
            android:id="@+id/bil1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="15dp"
            android:hint=""/>
        <EditText
            android:id="@+id/bil2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="15dp"
            android:hint="Input Bilangan 2...."/>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <Button
                android:onClick="tambah"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="#F1009A"
                android:text="+"
                android:layout_margin="5dp"
                android:textColor="@color/white"/>
            <Button
                android:onClick="kurang"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="#E91E63"
                android:text="-"
                android:layout_margin="5dp"
                android:textColor="@color/white"/>
            <Button
                android:onClick="kali"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@color/teal_700"
                android:text="*"
                android:layout_margin="5dp"
                android:textColor="@color/white"/>
            <Button
                android:onClick="bagi"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@color/teal_700"
                android:text=":"
                android:layout_margin="5dp"
                android:textColor="@color/white"/>
        </LinearLayout>
        <TextView
            android:id="@+id/hasil"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Hasil :"
            android:textSize="20dp"
            android:layout_marginTop="50dp"/>
    </LinearLayout>
</LinearLayout>

MainActivity

package com.example.afdat2;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    EditText Bil1,Bil2;
    TextView Hasil;



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

        Bil1 = findViewById(R.id.bil1);
        Bil2 = findViewById(R.id.bil2);
        Hasil = findViewById(R.id.hasil);
    }




    public void tambah(View view) {
        int bil1 = Integer.parseInt(Bil1.getText().toString());
        int bil2 = Integer.parseInt(Bil2.getText().toString());
        int hasil = bil1+bil2;
        Hasil.setText(+bil1+ " + " +bil2+"="+Integer.toString(hasil));
    }
    public void kurang(View view) {
        int bil1 = Integer.parseInt(Bil1.getText().toString());
        int bil2 = Integer.parseInt(Bil2.getText().toString());
        int hasil = bil1-bil2;
        Hasil.setText(+bil1+ " - " +bil2+"="+Integer.toString(hasil));
    }
    public void kali(View view) {
        int bil1 = Integer.parseInt(Bil1.getText().toString());
        int bil2 = Integer.parseInt(Bil2.getText().toString());
        int hasil = bil1*bil2;
        Hasil.setText(+bil1+ " x " +bil2+"="+Integer.toString(hasil));
    }
    public void bagi(View view) {
        float bil1 = Integer.parseInt(Bil1.getText().toString());
        float bil2 = Integer.parseInt(Bil2.getText().toString());
        double hasil = bil1/bil2;
        Hasil.setText(+bil1+ " : " +bil2+"="+hasil);
    }
}