Android - How to change bottom navigation bar text's font family

Question

I have created a bottom bar navigation in my android page. But now I want to apply the custom font-family in bottom navigation texts.

This is the bottom navigation c

Answer 1

Kotlin Code of custom BottomNavigationView to set custom font:

1.Keep a font to assets directory of your android studio project. Here I used my font "SolaimanLipi_20-04-07.ttf"

2.Copy below kotlin code and paste to your android studio project.

class FontBottomNavigationView : BottomNavigationView {


constructor(context: Context) : super(context) {

}

constructor(context: Context, attrs: AttributeSet) : super(context, attrs) {

}

constructor(context: Context, attrs: AttributeSet, defStyle: Int) : super(context, attrs, defStyle) {

}

private var fontFace: Typeface? = null

override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {
    super.onLayout(changed, left, top, right, bottom)

    val bottomMenu = getChildAt(0) as ViewGroup
    val bottomMenuChildCount: Int = bottomMenu.childCount
    var item: BottomNavigationItemView? = null
    var itemTitle: View? = null
    var shiftingMode: Field? = null

    if (fontFace == null){
        fontFace = Typeface.createFromAsset(context.assets, "SolaimanLipi_20-04-07.ttf") // font from assets directory
    }

    try {
        shiftingMode = bottomMenu.javaClass.getDeclaredField("mShiftingMode")
        shiftingMode.isAccessible = true
        shiftingMode.setBoolean(bottomMenu, false)
        shiftingMode.isAccessible = false
    } catch (e: Exception){
        e.printStackTrace()
    }

    for (i in 0..bottomMenuChildCount){
        try {
            item = bottomMenu.getChildAt(i) as BottomNavigationItemView
            itemTitle = item.getChildAt(1)
            ((itemTitle as BaselineLayout).getChildAt(0) as AppCompatTextView).typeface = fontFace
            ((itemTitle as BaselineLayout).getChildAt(1) as AppCompatTextView).typeface = fontFace
        } catch (e: Exception){
            e.printStackTrace()
        }

    }

}}

3.Use on xml file as like below:

@Arash answer helped: