popup_info.xml

<?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="wrap_content"
    android:layout_height="wrap_content"
    android:paddingStart="16dp"
    android:paddingEnd="16dp">

    <android.support.v7.widget.AppCompatImageView
        android:id="@+id/arrowUp"
        android:layout_width="16dp"
        android:layout_height="16dp"
        android:layout_marginStart="8dp"
        android:background="@drawable/triangle_down"
        android:rotation="180"
        app:backgroundTint="@color/black_alpha75"
        app:layout_constraintEnd_toEndOf="@+id/info"
        app:layout_constraintStart_toStartOf="@+id/info"
        app:layout_constraintTop_toTopOf="parent" />

    <android.support.v7.widget.AppCompatTextView
        android:id="@+id/info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:background="@drawable/corner_black_alpha75"
        android:paddingStart="16dp"
        android:paddingTop="8dp"
        android:paddingEnd="16dp"
        android:paddingBottom="8dp"
        android:textColor="@color/white_text"
        android:textSize="@dimen/text_size_caption"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/arrowUp"
        tools:text="infsfdgsdfgsdfgo" />

    <android.support.v7.widget.AppCompatImageView
        android:id="@+id/dropdown"
        android:layout_width="16dp"
        android:layout_height="16dp"
        android:layout_marginStart="8dp"
        android:background="@drawable/triangle_down"
        app:backgroundTint="@color/black_alpha75"
        app:layout_constraintEnd_toEndOf="@+id/info"
        app:layout_constraintStart_toStartOf="@+id/info"
        app:layout_constraintTop_toBottomOf="@+id/info" />

</android.support.constraint.ConstraintLayout>

PopupInfoExt.kt

@SuppressLint("InflateParams")
fun View.showPopupInfo(text: String) {
    val view = LayoutInflater.from(context).inflate(R.layout.popup_info, null, false)
    val popupWindow = PopupWindow(view, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true)
    popupWindow.isTouchable = true
    popupWindow.setTouchInterceptor { _, _ -> false }

    val windowWidth = Resources.getSystem().displayMetrics.widthPixels

    popupWindow.showAsDropDown(this, windowWidth, -height * 2)
    view.info.text = text

    view.viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
        override fun onGlobalLayout() {
            view.viewTreeObserver.removeOnGlobalLayoutListener(this)
            val rootLocation = IntArray(2)
            getLocationOnScreen(rootLocation)

            val offsetX = -(view.width / 2) + width / 2
            val offsetY = if (rootLocation[1] - view.height <= 32.toDp()) {
                view.arrowUp.visible()
                view.dropdown.gone()
                0
            } else {
                view.arrowUp.gone()
                view.dropdown.visible()
                -height - view.height + view.arrowUp.height
            }
            popupWindow.dismiss()
            popupWindow.showAsDropDown(this@showPopupInfo, offsetX, offsetY)

            view.viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
                override fun onGlobalLayout() {
                    view.viewTreeObserver.removeOnGlobalLayoutListener(this)
                    val popupLocation = IntArray(2)
                    view.getLocationOnScreen(popupLocation)

                    val arrowX = (rootLocation[0] - popupLocation[0] + width / 2 - view.dropdown.width / 2).toFloat()
                    view.arrowUp.x = arrowX
                    view.dropdown.x = arrowX
                }
            })
        }
    })
}