How to set the text size of a TextView in Kotlin Android

How to set the text size of a TextView in Kotlin Android.

Here is a step-by-step tutorial on how to set the text size of a TextView in Kotlin Android:

Create a new Android project in your preferred Kotlin IDE.
Open the layout XML file where you want to add the TextView. This file is usually located in the res/layout directory and has a .xml extension.
Inside the layout XML file, add a TextView element. You can do this by typing <TextView> and pressing Enter. Make sure to give it a unique id using the android:id attribute, and set any other desired attributes such as android:text for the text content.
```
<TextView
    android:id="@+id/myTextView"
    android:text="Hello, World!"
    ... />
```
Save the layout XML file and switch to the corresponding Kotlin file. This file is usually located in the src/main/java directory and has a .kt extension.
Inside the Kotlin file, find the onCreate method. This is the entry point of your activity or fragment.
Inside the onCreate method, use the findViewById function to get a reference to the TextView by its id.
```
val myTextView = findViewById<TextView>(R.id.myTextView)
```
Use the setTextSize method on the TextView object to set the desired text size. This method takes a Float value representing the text size in scaled pixels (sp).
```
myTextView.setTextSize(20F)
```
In this example, we set the text size to 20sp.
Optionally, you can use the setTextSize method with the TypedValue class to set the text size using a different unit, such as pixels (px) or density-independent pixels (dp).
```
val textSizePx = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 16F, resources.displayMetrics)
myTextView.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSizePx)
```
In this example, we set the text size to 16dp.
Save the Kotlin file and run your Android application. The TextView should now display the text with the specified text size.

That's it! You have successfully set the text size of a TextView in Kotlin Android. Feel free to experiment with different text sizes to achieve the desired visual effect.