How to change the text size of Radio Button programmatically in Android

In this android programming source code example, we are going to change the text size of Radio Button programmatically in Android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to change the text size of Radio Button programmatically in Android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical" 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=".radiobutton.RadioButton1"
    android:layout_margin="10dp">

    <TextView
        android:id="@+id/textView25"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="RadioButton Text Size" />

    <RadioButton
        android:id="@+id/radioButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="RadioButton1" />

</LinearLayout>

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.RadioButton;

import com.inducesmile.inducesmile_button.R;

public class RadioButton1 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_radio_button1);

        RadioButton radioButton1 = findViewById(R.id.radioButton);
        radioButton1.setTextSize(20);
    }
}