Image hiding under button android-CodePudding

Image view is hiding under the button what changes I can do so that the image view can be above the button view pager also have bottom padding so that button can properly accommodate. The image is showing on the other parts but not above the button.

  <?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"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".McqActivity"
        android:id="@ id/fragment"
        >
    
        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent">
    
    
                <ImageView
                android:id="@ id/starFirst"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:src="@drawable/ic_baseline_star_24"
                />                  
    
    
            <com.google.android.material.button.MaterialButton
                android:id="@ id/right"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                 />
    
        </RelativeLayout>
    
        <androidx.viewpager2.widget.ViewPager2
            android:id="@ id/questions_view_frag"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.0"
            android:orientation="horizontal"
            android:paddingBottom="20dp"
            android:paddingTop="50dp"
            >
    
        </androidx.viewpager2.widget.ViewPager2>
        
    
    </androidx.constraintlayout.widget.ConstraintLayout>

CodePudding user response：

layout_constraintBottom_toBottomOf and other layout_constraint... won't work inside RelativeLayout, these are desired to work with ConstraintLayout as strict parent. if you want to align two Views next to/below/above inside RelativeLayoyut you have to use other attributes, e.g.

android:layout_below="@ id/starFirst"
android:layout_above="@ id/starFirst"
android:layout_toRightOf="@id/starFirst"
android:layout_toLeftOf="@id/starFirst"

note that every attr which starts with layout_ is desired to be read by strict parent, not by View which have such attrs set. every ViewGroup have own set of such

edit: turned out that this is an elevation case/issue (Z axis), so useful attributes are

android:translationZ="100dp"
android:elevation="100dp"