Ответ 1
Мне удалось сделать BottomNavigationView с значком. Вот мой код (Котлин).
Это панель (унаследованная от BottomNavigationView)
/** Bottom menu with badge */
class AdvancedBottomNavigationView(context: Context, attrs: AttributeSet) : BottomNavigationView(context, attrs) {
private companion object {
const val BADGE_MIN_WIDTH = 16 // [dp]
const val BADGE_MARGIN_TOP = 5 // [dp]
const val BADGE_MARGIN_LEFT = 15 // [dp]
}
@Inject internal lateinit var uiCalculator: UICalculatorInterface
private val bottomMenuView: BottomNavigationMenuView
init {
// Get access to internal menu
val field = BottomNavigationView::class.java.getDeclaredField("mMenuView")
field.isAccessible = true
bottomMenuView = field.get(this) as BottomNavigationMenuView
App.injections.presentationLayerComponent!!.inject(this)
@SuppressLint("CustomViewStyleable")
val a = context.obtainStyledAttributes(attrs, R.styleable.advanced_bottom_navigation_bar)
val badgeLayoutId = a.getResourceId(R.styleable.advanced_bottom_navigation_bar_badge_layout, -1)
a.recycle()
initBadges(badgeLayoutId)
}
/**
* [position] index of menu item */
fun setBadgeValue(position: Int, count: Int) {
val menuView = bottomMenuView
val menuItem = menuView.getChildAt(position) as BottomNavigationItemView
val badge = menuItem.findViewById(R.id.bottom_bar_badge)
val badgeText = menuItem.findViewById(R.id.bottom_bar_badge_text) as TextView
if (count > 0) {
badgeText.text = count.toString()
badge.visibility = View.VISIBLE
} else {
badge.visibility = View.GONE
}
}
/**
* Select menu item
* [position] index of menu item to select
*/
fun setSelected(position: Int) = bottomMenuView.getChildAt(position).performClick()
private fun initBadges(badgeLayoutId: Int) {
// Adding badges to each Item
val menuView = bottomMenuView
val totalItems = menuView.childCount
val oneItemAreaWidth = uiCalculator.getScreenSize(context).first / totalItems
val marginTop = uiCalculator.dpToPixels(context, BADGE_MARGIN_TOP)
val marginLeft = uiCalculator.dpToPixels(context, BADGE_MARGIN_LEFT)
for (i in 0 until totalItems) {
val menuItem = menuView.getChildAt(i) as BottomNavigationItemView
// Add badge to every item
val badge = View.inflate(context, badgeLayoutId, null) as FrameLayout
badge.visibility = View.GONE
badge.minimumWidth = uiCalculator.dpToPixels(context, BADGE_MIN_WIDTH)
val layoutParam = FrameLayout.LayoutParams(
FrameLayout.LayoutParams.WRAP_CONTENT,
FrameLayout.LayoutParams.WRAP_CONTENT)
layoutParam.gravity = Gravity.START
layoutParam.setMargins(oneItemAreaWidth / 2 + marginLeft, marginTop, 0, 0)
menuItem.addView(badge, layoutParam)
}
}
}
Файл attr.xml с параметрами для этого компонента:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="advanced_bottom_navigation_bar">
<attr name="badge_layout" format="reference|integer" />
</declare-styleable>
</resources>
Фон для значка из выпадающей папки:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<solid android:color="#ff0000" />
<corners android:radius="10dp" />
</shape>
</item>
</selector>
Значок:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
android:id="@+id/bottom_bar_badge"
android:layout_height="20dp"
android:layout_width="20dp"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/bcg_badge"
>
<TextView
android:id="@+id/bottom_bar_badge_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
android:textSize="10sp"
android:textColor="@android:color/white"
xmlns:android="http://schemas.android.com/apk/res/android"
android:textAlignment="center"
android:layout_gravity="center"/>
</FrameLayout>
И это пример того, как использовать его в вашем коде:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="su.ivcs.ucim.presentationLayer.userStories.mainScreen.view.MainActivity">
<su.ivcs.ucim.presentationLayer.common.advancedBottomNavigationView.AdvancedBottomNavigationView
android:id="@+id/bottom_navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
app:itemBackground="@android:color/white"
app:itemIconTint="@color/main_screen_tabs_menu_items"
app:itemTextColor="@color/main_screen_tabs_menu_items"
app:menu="@menu/main_screen_tabs_menu"
app:badge_layout = "@layout/common_badge"
app:layout_constraintTop_toBottomOf="@+id/fragmentsContainer"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
/>
</android.support.constraint.ConstraintLayout>
Надеюсь, это поможет вам.