Mavzu: Android Studio muhitini o‘rnatish. Vidjetlar bilan ishlash. Xodisalar o‘rnatish

RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RadioButton
android:id="@+id/btn1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="+"/>
<RadioButton
android:id="@+id/btn2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="-"/>
<RadioButton
android:id="@+id/btn3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="*"/>
<RadioButton
android:id="@+id/btn4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="/"/>
RadioGroup>
<TextView
android:id="@+id/natija"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Result"
android:textSize="25sp"
android:textAlignment="center"
android:textStyle="bold"/>
LinearLayout>

Quydagi qismda dizayni yani tashqi ko’rinishini qurib oldik harbir elementga Id beridik
package com.example.hodisalar;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

EditText son1, son2;

TextView natija;
RadioGroup radioGroup;
RadioButton btn1, btn2,btn3, btn4;

@Override