[Kotlin] Set indent to first line of TextView in android

 - Description

To do so, you should use Span, LeadingMarginSpan.

In a nutshell, Span is used to set text style in detail, and LeadingMarginSpan is one of the styles that is related to margin, especially can set margins of first and rest separately.

 

First of all, initialize your span which will be assigned to textView.

val spannable = SpannableString(yourTextView.text)

And, define LeadingMarginSpan like below.

val span = LeadingMarginSpan.Standard(50, 0)

The first parameter(50) is indent for first line, and the seconds is for rest lines.

 

Next, use setSpan() to apply LeadingMarginSpan to Span like this.

spannable.setSpan(span, 0, spannable.count(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

Finally assign Span to textView!

yourTextView.text = spannable

 

 - Code

The integrated codes is as follows.

val spannable = SpannableString(yourTextView.text)
val span = LeadingMarginSpan.Standard(50, 0)
spannable.setSpan(span, 0, spannable.count(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

yourTextView.text = spannable

 

 - Result

 

 

 - Documents

https://developer.android.com/guide/topics/text/spans

스팬  |  Android 개발자  |  Android Developers

https://developer.android.com/reference/android/text/style/LeadingMarginSpan

LeadingMarginSpan  |  Android Developers