Android Yazılı Ortalaması Hesaplama ve Geçti Kaldı Örneği

Bu örnekte Android (Java) ile kullanıcının girdiği iki yazılı notunun ortalamasını hesaplayan ve ortalama 50′ den küçükse “Kaldı” değilse “Geçti” yazdıran örnek oluşturacağız.

Tasarım:

activity_main.xml Kodları:


<?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/editYazili1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:ems="10"
        android:inputType="number"
        android:hint="1. Yazılı Notunuzu Girin."
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editYazili2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="2. Yazılı Notunuzu Girin."
        android:layout_marginTop="20dp"
        android:inputType="number"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editYazili1" />

    <Button
        android:id="@+id/button"
        android:layout_width="211dp"
        android:layout_height="60dp"
        android:onClick="onClick"
        android:layout_marginTop="20dp"
        android:text="Hesapla"
        android:textSize="18dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editYazili2" />

    <TextView
        android:id="@+id/textOrtalama"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Ortalamanız: "
        android:textSize="24dp"
        android:layout_marginTop="20dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

    <TextView
        android:id="@+id/textDurum"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Durum: "
        android:textSize="24dp"
        android:layout_marginTop="20dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textOrtalama" />
</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/editYazili1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginTop="20dp"

android:ems="10"

android:inputType="number"

android:hint="1. Yazılı Notunuzu Girin."

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

<EditText

android:id="@+id/editYazili2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="2. Yazılı Notunuzu Girin."

android:layout_marginTop="20dp"

android:inputType="number"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.497"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/editYazili1" />

<Button

android:id="@+id/button"

android:layout_width="211dp"

android:layout_height="60dp"

android:onClick="onClick"

android:layout_marginTop="20dp"

android:text="Hesapla"

android:textSize="18dp"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@+id/editYazili2" />

<TextView

android:id="@+id/textOrtalama"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Ortalamanız: "

android:textSize="24dp"

android:layout_marginTop="20dp"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.498"

app:layout_constraintStart_toStartOf="parent"

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

<TextView

android:id="@+id/textDurum"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Durum: "

android:textSize="24dp"

android:layout_marginTop="20dp"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.498"

app:layout_constraintStart_toStartOf="parent"

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

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java Kodları:


package com.example.ortalama;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText editYazili1,editYazili2;
    TextView textOrtalama,textDurum;

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

    public void onClick(View view) {
        float yazili1,yazili2,ortalama;
        editYazili1=findViewById(R.id.editYazili1);
        editYazili2=findViewById(R.id.editYazili2);
        textOrtalama=findViewById(R.id.textOrtalama);
        textDurum=findViewById(R.id.textDurum);
        if(editYazili1.length()==0 || editYazili2.length()==0){
            Toast.makeText(getApplicationContext(),"Yazılı alanları boş bırakılamaz.",Toast.LENGTH_SHORT).show();
        }
        else{
            yazili1=Float.parseFloat(editYazili1.getText().toString());
            yazili2=Float.parseFloat(editYazili2.getText().toString());
            ortalama=(yazili1+yazili2)/2;
            textOrtalama.setText("Ortalamanız: "+ortalama);
            if(ortalama<50){
                textDurum.setText("Durum: KALDI");
                textDurum.setTextColor(Color.RED);
            }
            else{
                textDurum.setText("Durum: GEÇTİ");
                textDurum.setTextColor(Color.GREEN);
            }
        }
    }
}

package com.example.ortalama;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;

import android.os.Bundle;

import android.view.View;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

EditText editYazili1,editYazili2;

TextView textOrtalama,textDurum;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

public void onClick(View view) {

float yazili1,yazili2,ortalama;

editYazili1=findViewById(R.id.editYazili1);

editYazili2=findViewById(R.id.editYazili2);

textOrtalama=findViewById(R.id.textOrtalama);

textDurum=findViewById(R.id.textDurum);

if(editYazili1.length()==0 || editYazili2.length()==0){

Toast.makeText(getApplicationContext(),"Yazılı alanları boş bırakılamaz.",Toast.LENGTH_SHORT).show();

}

else{

yazili1=Float.parseFloat(editYazili1.getText().toString());

yazili2=Float.parseFloat(editYazili2.getText().toString());

ortalama=(yazili1+yazili2)/2;

textOrtalama.setText("Ortalamanız: "+ortalama);

if(ortalama<50){

textDurum.setText("Durum: KALDI");

textDurum.setTextColor(Color.RED);

}

else{

textDurum.setText("Durum: GEÇTİ");

textDurum.setTextColor(Color.GREEN);

}

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