<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="#AEE8E9"
    android:orientation="vertical"
    tools:context="com.example.imad.calculatrice.MainActivity">
    <TextView
        android:id="@+id/label"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#000"
        android:textStyle="bold"
        android:textSize="25dp"
        android:text="@string/help_instructions" />
    <EditText
        android:id="@+id/numberOne"
        android:layout_width="match_parent"
        android:inputType="numberDecimal"
        android:layout_marginTop="25dp"
        android:layout_height="wrap_content" />
    <EditText
        android:id="@+id/numberTwo"
        android:layout_width="match_parent"
        android:inputType="numberDecimal"
        android:layout_marginTop="25dp"
        android:layout_height="wrap_content" />
    <LinearLayout
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal"
        >
        <Button
            android:id="@+id/plusButton"
            android:text="+"
            style="?android:buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <Button
            android:id="@+id/moinsButton"
            android:text="-"
            style="?android:buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <Button
            android:id="@+id/multiButton"
            android:text="*"
            style="?android:buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <Button
            android:id="@+id/divButton"
            android:text="/"
            style="?android:buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <Button
            android:id="@+id/clear"
            android:text="CLR"
            style="?android:buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <TextView
        android:id="@+id/result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#000"
        android:textStyle="bold"
        android:textSize="25dp"
        android:layout_marginTop="10dp"
        android:text="Resultat" />
    <TextView
        android:id="@+id/resultDisplay"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#000"
        android:textStyle="bold"
        android:textSize="25dp"
        android:layout_marginTop="10dp"
        android:text="0.0" />
</LinearLayout>

                            

                                package com.example.imad.calculatrice;

import android.renderscript.Double2;
import android.support.annotation.IntegerRes;
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;

public class MainActivity extends AppCompatActivity {
    private EditText  nombre1;
    private EditText  nombre2;
    private Button  btnAddition;
    private Button  btnMultiplication;
    private Button  btnDivision;
    private Button  btnSoustraction;
    private Button  btnClear;
    private TextView resultTxt;
                            

                                        nombre1 = (EditText) findViewById(R.id.numberOne);
        nombre2 = (EditText) findViewById(R.id.numberTwo);
        btnAddition = (Button) findViewById(R.id.plusButton);
        btnMultiplication = (Button) findViewById(R.id.multiButton);
        btnDivision = (Button) findViewById(R.id.divButton);
        btnSoustraction = (Button) findViewById(R.id.moinsButton);
        btnClear = (Button) findViewById(R.id.clear);
        resultTxt = (TextView) findViewById(R.id.resultDisplay);
                            

                                     //addition
        btnAddition.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if((nombre1.getText().length() > 0) && (nombre2.getText().length() > 0)) {
                    double nbr1 = Double.parseDouble(nombre1.getText().toString());
                    double nbr2 = Double.parseDouble(nombre2.getText().toString());
                    double result = nbr1 + nbr2;
                    resultTxt.setText(Double.toString(result));
                }else{
                    Toast.makeText(MainActivity.this,"Veuillez remplir tous les champs!",Toast.LENGTH_LONG).show();
                }
            }
        });
        //multiplication
        btnMultiplication.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if((nombre1.getText().length() > 0) && (nombre2.getText().length() > 0)) {
                    double nbr1 = Double.parseDouble(nombre1.getText().toString());
                    double nbr2 = Double.parseDouble(nombre2.getText().toString());
                    double result = nbr1 * nbr2;
                    resultTxt.setText(Double.toString(result));
                }else{
                    Toast.makeText(MainActivity.this,"Veuillez remplir tous les champs!",Toast.LENGTH_LONG).show();
                }
            }
        });
                                

                                     //soustraction
        btnSoustraction.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if((nombre1.getText().length() > 0) && (nombre2.getText().length() > 0)) {
                    double nbr1 = Double.parseDouble(nombre1.getText().toString());
                    double nbr2 = Double.parseDouble(nombre2.getText().toString());
                    double result = nbr1 - nbr2;
                    resultTxt.setText(Double.toString(result));
                }else{
                    Toast.makeText(MainActivity.this,"Veuillez remplir tous les champs!",Toast.LENGTH_LONG).show();
                }
            }
        });
        //division
        btnDivision.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if((nombre1.getText().length() > 0) && (nombre2.getText().length() > 0)) {
                    double nbr1 = Double.parseDouble(nombre1.getText().toString());
                    double nbr2 = Double.parseDouble(nombre2.getText().toString());
                    double result = nbr1 / nbr2;
                    resultTxt.setText(Double.toString(result));
                }else{
                    Toast.makeText(MainActivity.this,"Veuillez remplir tous les champs!",Toast.LENGTH_LONG).show();
                }
            }
        });
        btnClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                nombre1.setText("");
                nombre2.setText("");
                resultTxt.setText("0.00");
            }
        });