Android Java ile Dört İşlem Yapan Mobil Uygulama

Bu derste Android programlama ile kullanıcının girdiği sayılar üzerinde Toplama, Çıkarma, Çarpma, Bölme işlemlerini gerçekleştireceğiz.

Örneğimizde 4 Button, 2 adet EditText ve 1 adet TextView bulunmaktadır.

Yerleşime ait activity_main.xml dosyası aşağıdaki gibidir.


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

    <EditText
        android:id="@+id/editTextNumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:ems="10"
        android:inputType="number"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editTextNumber2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:inputType="number"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextNumber" />

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:orientation="horizontal"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextNumber2">

        <Button
            android:id="@+id/buttonTopla"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:onClick="topla"
            android:text="+" />

        <Button
            android:id="@+id/buttonCikar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:onClick="cikar"
            android:text="-" />

        <Button
            android:id="@+id/buttonCarp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:onClick="carp"
            android:text="X" />

        <Button
            android:id="@+id/buttonBol"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"
            android:layout_weight="1"
            android:layout_marginLeft="10dp"
            android:onClick="bol"
            android:text="/" />
    </LinearLayout>

    <TextView
        android:id="@+id/textViewSonuc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="TextView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/linearLayout" />

</androidx.constraintlayout.widget.ConstraintLayout>

<?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"

tools:context=".MainActivity">

<EditText

android:id="@+id/editTextNumber"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="32dp"

android:ems="10"

android:inputType="number"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<EditText

android:id="@+id/editTextNumber2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="16dp"

android:ems="10"

android:inputType="number"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/editTextNumber" />

<LinearLayout

android:id="@+id/linearLayout"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="24dp"

android:orientation="horizontal"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/editTextNumber2">

<Button

android:id="@+id/buttonTopla"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="10dp"

android:layout_weight="1"

android:onClick="topla"

android:text="+" />

<Button

android:id="@+id/buttonCikar"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:layout_marginLeft="10dp"

android:onClick="cikar"

android:text="-" />

<Button

android:id="@+id/buttonCarp"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:layout_marginLeft="10dp"

android:onClick="carp"

android:text="X" />

<Button

android:id="@+id/buttonBol"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginRight="10dp"

android:layout_weight="1"

android:layout_marginLeft="10dp"

android:onClick="bol"

android:text="/" />

</LinearLayout>

<TextView

android:id="@+id/textViewSonuc"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="24dp"

android:text="TextView"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/linearLayout" />

</androidx.constraintlayout.widget.ConstraintLayout>

Kodlarımızı MainActivity.java için aşağıdaki gibi oluşturalım.


package com.example.dortislem;

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;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText editSayi1,editSayi2;
    Button btnTopla,btnCikar,btnCarp,btnBol;
    TextView txtSonuc;


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

        editSayi1=(EditText) findViewById(R.id.editTextNumber);
        editSayi2=(EditText) findViewById(R.id.editTextNumber2);
        btnTopla=(Button) findViewById(R.id.buttonTopla);
        btnCikar=(Button) findViewById(R.id.buttonCikar);
        btnCarp=(Button) findViewById(R.id.buttonCarp);
        btnBol=(Button) findViewById(R.id.buttonBol);
        txtSonuc=(TextView) findViewById(R.id.textViewSonuc);


        //Topla
        btnTopla.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int sayi1=Integer.parseInt(editSayi1.getText().toString());
                int sayi2=Integer.parseInt(editSayi2.getText().toString());
                int sonuc=sayi1+sayi2;
                txtSonuc.setText(String.valueOf(sonuc));
            }
        });

        //Çıkar
        btnCikar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int sayi1=Integer.parseInt(editSayi1.getText().toString());
                int sayi2=Integer.parseInt(editSayi2.getText().toString());
                int sonuc=sayi1-sayi2;
                txtSonuc.setText(String.valueOf(sonuc));
            }
        });

        //Çarp
        btnCarp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int sayi1=Integer.parseInt(editSayi1.getText().toString());
                int sayi2=Integer.parseInt(editSayi2.getText().toString());
                int sonuc=sayi1*sayi2;
                txtSonuc.setText(String.valueOf(sonuc));
            }
        });

        //Böl
        btnBol.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                double sayi1=Integer.parseInt(editSayi1.getText().toString());
                double sayi2=Integer.parseInt(editSayi2.getText().toString());
                double sonuc=sayi1/sayi2;
                txtSonuc.setText(String.valueOf(sonuc));
            }
        });
    }
}

package com.example.dortislem;

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;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

EditText editSayi1,editSayi2;

Button btnTopla,btnCikar,btnCarp,btnBol;

TextView txtSonuc;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

editSayi1=(EditText) findViewById(R.id.editTextNumber);

editSayi2=(EditText) findViewById(R.id.editTextNumber2);

btnTopla=(Button) findViewById(R.id.buttonTopla);

btnCikar=(Button) findViewById(R.id.buttonCikar);

btnCarp=(Button) findViewById(R.id.buttonCarp);

btnBol=(Button) findViewById(R.id.buttonBol);

txtSonuc=(TextView) findViewById(R.id.textViewSonuc);

//Topla

btnTopla.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

int sayi1=Integer.parseInt(editSayi1.getText().toString());

int sayi2=Integer.parseInt(editSayi2.getText().toString());

int sonuc=sayi1+sayi2;

txtSonuc.setText(String.valueOf(sonuc));

}

});

//Çıkar

btnCikar.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

int sayi1=Integer.parseInt(editSayi1.getText().toString());

int sayi2=Integer.parseInt(editSayi2.getText().toString());

int sonuc=sayi1-sayi2;

txtSonuc.setText(String.valueOf(sonuc));

}

});

//Çarp

btnCarp.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

int sayi1=Integer.parseInt(editSayi1.getText().toString());

int sayi2=Integer.parseInt(editSayi2.getText().toString());

int sonuc=sayi1*sayi2;

txtSonuc.setText(String.valueOf(sonuc));

}

});

//Böl

btnBol.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

double sayi1=Integer.parseInt(editSayi1.getText().toString());

double sayi2=Integer.parseInt(editSayi2.getText().toString());

double sonuc=sayi1/sayi2;

txtSonuc.setText(String.valueOf(sonuc));

}

});

}

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