Membuat Kalkulator Sederhana dengan Android Studio

Membuat Kalkulator sederhana dengan Android Studio 

	<?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=".MainActivity">
	<TextView
	android:id="@+id/inputAngka1"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="Masukkan Angka 1(Hasil)"
	/>
	<EditText
	android:id="@+id/editText1"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="0"
	android:inputType="number"
	android:layout_alignParentStart="true"
	android:layout_marginTop="19dp" />
	<TextView
	android:id="@+id/inputAngka2"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="Masukkan Angka2"
	android:layout_below="@+id/editText1"
	android:layout_alignParentStart="true"
	android:layout_marginTop="66dp" />
	<EditText
	android:id="@+id/editText2"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:text="0"
	android:inputType="number"
	android:layout_below="@+id/editText1"
	android:layout_alignParentStart="true"
	android:layout_marginTop="107dp" />
	<Button
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_marginTop="19dp"
	android:text="+"
	android:id="@+id/buttonTambah"
	android:layout_below="@+id/editText2"
	android:layout_alignParentStart="true" />
	<Button
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="-"
	android:id="@+id/buttonKurang"
	android:layout_above="@+id/buttonBagi"
	android:layout_toEndOf="@+id/inputAngka2" />
	<Button
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="x"
	android:id="@+id/buttonKali"
	android:layout_alignBaseline="@+id/buttonBagi"
	android:layout_alignBottom="@+id/buttonBagi"
	android:layout_alignParentStart="true" />
	<Button
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text=":"
	android:id="@+id/buttonBagi"
	android:layout_below="@+id/buttonTambah"
	android:layout_alignStart="@+id/buttonKurang"
	android:layout_marginTop="45dp" />
	</RelativeLayout>

view raw activity_main.xml hosted with ❤ by GitHub

	package com.blogspot.inwirawan.kalkulatorku;
	import android.support.v7.app.AppCompatActivity;
	import android.os.Bundle;
	import android.view.View;
	import android.widget.Button;
	import android.widget.EditText;
	public class MainActivity extends AppCompatActivity {
	EditText editText1, editText2;
	Button buttonTambah;
	Button buttonKurang;
	Button buttonKali;
	Button buttonBagi;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	editText1 = (EditText) findViewById(R.id.editText1);
	editText2 = (EditText) findViewById(R.id.editText2);
	buttonTambah = (Button) findViewById(R.id.buttonTambah);
	buttonKurang = (Button) findViewById(R.id.buttonKurang);
	buttonKali = (Button) findViewById(R.id.buttonKali);
	buttonBagi = (Button) findViewById(R.id.buttonBagi);
	buttonTambah.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	double a = Double.parseDouble(editText1.getText().toString());
	double b = Double.parseDouble(editText2.getText().toString());
	double result = a + b;
	editText1.setText(Double.toString(result));
	}
	});
	buttonKurang.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	double a = Double.parseDouble(editText1.getText().toString());
	double b = Double.parseDouble(editText2.getText().toString());
	double result = a - b;
	editText1.setText(Double.toString(result));
	}
	});
	buttonKali.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	double a = Double.parseDouble(editText1.getText().toString());
	double b = Double.parseDouble(editText2.getText().toString());
	double result = a * b;
	editText1.setText(Double.toString(result));
	}
	});
	buttonBagi.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	double a = Double.parseDouble(editText1.getText().toString());
	double b = Double.parseDouble(editText2.getText().toString());
	double result = a / b;
	editText1.setText(Double.toString(result));
	}
	});
	}
	}

view raw MainActivity.java hosted with ❤ by GitHub

Langkah pertama :
1. Buka Android Studio :D
2. Setting nama aplikasi, level API, dan letak file
3. Buka activity_main.xml, dan copy code activity_main.xml
4. Lalu buka Main_Activity.java dan copy code.
5. Run di hp dan jangan lupa aktifkan USB Debugging

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