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Some background…

<?xml version="1.0" encoding="utf-8"?>
<animated-selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/checked"
        android:drawable="@drawable/ic_tab_home_24"
        android:state_checked="true" />

    <item
        android:id="@+id/unchecked"
        android:drawable="@drawable/ic_tab_home_outline_24"
        android:state_checked="false" />

    <transition
        android:drawable="@drawable/anim_tab_home_select"
        android:fromId="@id/unchecked"
        android:toId="@id/checked" />

    <transition
        android:drawable="@drawable/anim_tab_home_deselect"
        android:fromId="@id/checked"
        android:toId="@id/unchecked" />
</animated-selector>

So I made the ImageView checkable, and passed in the selected tab state to each AndroidView and here is the result:

Show me the code! 😅
@Composable
fun AnimatedIcon(
    @DrawableRes animatedIcon: Int,
    isSelected: Boolean,
    modifier: Modifier = Modifier,
) {
    AndroidView(
        modifier = modifier.size(24.dp),
        factory = { context ->
            CheckableImageView(context).apply {
                val drawable = ContextCompat.getDrawable(context, animatedIcon)
                setImageDrawable(drawable)
                isChecked = isSelected
                if (drawable is Animatable) drawable.start()
            }
        },
        update = { view ->
            view.isChecked = isSelected
        }
    )
}

private class CheckableImageView(context: Context, attrs: AttributeSet? = null) :
    AppCompatImageView(context, attrs),
    Checkable {

    private var mChecked = false

    override fun onCreateDrawableState(extraSpace: Int): IntArray {
        val drawableState = super.onCreateDrawableState(extraSpace + 1)
        if (isChecked) {
            mergeDrawableStates(drawableState, CHECKED_STATE_SET)
        }
        return drawableState
    }

    override fun toggle() {
        isChecked = !mChecked
    }

    override fun isChecked(): Boolean = mChecked

    override fun setChecked(checked: Boolean) {
        if (mChecked != checked) {
            mChecked = checked
            refreshDrawableState()
        }
    }

    companion object {
        private val CHECKED_STATE_SET = intArrayOf(
            android.R.attr.state_checked
        )
    }
}
@Composable
private fun BottomNavigationTabs(
    navController: NavController,
    onSetTab: (BottomNavItem) -> Unit,
) {
    val items = listOf(
        BottomNavItem.Home,
        BottomNavItem.Games,
        BottomNavItem.Players,
        BottomNavItem.Menu,
    )
    NavigationBar {
        val navBackStackEntry by navController.currentBackStackEntryAsState()
        val currentRoute = navBackStackEntry?.destination?.route
        items.forEach { item ->
            val isSelected = currentRoute == item.route
            val title = stringResource(id = item.titleRes)

            NavigationBarItem(
                selected = isSelected,
                onClick = { onSetTab(item) },
                alwaysShowLabel = false,
                label = {
                    Text(
                        text = title,
                        style = MaterialTheme.typography.labelSmall,
                    )
                },
                icon = {
                    AnimatedIcon(
                        item.icon,
                        isSelected = isSelected,
                    )
                }
            )
        }
    }
}
Conclusion

This article was originally published on proandroiddev.com

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