NavigationView menu items with counter on the right

Question

The new NavigationView in the new Design Support Library works really great.

They use \"menu-items\" to display th

Answer 1

I wanted to have a badge icon for the counters as well. This badge would be pill shaped and have the ability to be different colors to differentiate between important badges and unimportant badges.

To accomplish this, I created a custom view Badge

class Badge @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyle: Int = 0,
    defStyleRes: Int = 0
) : LinearLayout(context, attrs, defStyle, defStyleRes) {
    private val badgeText: TextView
    private var important: Boolean

    init {
        inflate(context, R.layout.badge, this)
        badgeText = findViewById(R.id.badge)
        important = false
        isImportant(important)
        adjustVisibility()
    }

    fun setText(text: String) {
        badgeText.text = text
        adjustVisibility()
    }

    fun isImportant(isImportant: Boolean) {
        if (isImportant) {
            badgeText.backgroundTintList = ColorStateList.valueOf(
                ContextCompat.getColor(
                    context,
                    R.color.nav_badge_important
                )
            )
        } else {
            badgeText.backgroundTintList = ColorStateList.valueOf(
                ContextCompat.getColor(
                    context,
                    R.color.nav_badge_unimportant
                )
            )
        }
    }

    private fun adjustVisibility() {
        if (badgeText.text.isNullOrBlank() && this.visibility == VISIBLE) {
            this.visibility = INVISIBLE
        } else {
            this.visibility = VISIBLE
        }
    }
}

The layout for the Badge

The style for the Badge

The drawable for the Badge

For each menu item with the ability to show a Badge, you need to add app:actionViewClass="com.example.ui.Badge" to your Navigation Menu.

The Badge class gives you the ability to set the text and importance of the badge programmatically.

private fun setupBadges(navView: NavigationView) {
    val badgesItemOne = navView.menu.findItem(R.id.nav_one).actionView as Badge
    val badgesItemTwo = navView.menu.findItem(R.id.nav_two).actionView as Badge
    val badgesItemThree = navView.menu.findItem(R.id.nav_three).actionView as Badge

    badgesItemOne.setText("6+")
    badgesItemOne.isImportant(true)
    badgesItemTwo.setText("2")
    badgesItemThree.setText("99+")
}