This example will put a box at the bottom of the parent view, where 50% of box is outside of / covered by the parent.
layout_margintreat negative value as0- To simulate negative margin, create a invisible view. Since I want the box to be at the bottom of parent, I apply bottom contraint to the bottom of parent. Since I want 50% of the box to be visible (another 50% clipped by the parent view), I apply bottom margin using half the height of the box view.
- To box will apply top constraint to the bottom of the invisible view (putting it below the invisible view).
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
<View
android:id="@+id/hiddenBottomView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="25dp"
android:background="@color/colorPrimary"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
/>
<ImageView
android:id="@+id/boxImageView"
android:layout_width="50dp"
android:layout_height="50dp"
android:background="#FE2EF7"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/hiddenBottomView"
/>
</androidx.constraintlayout.widget.ConstraintLayout>References: