Android RelativeLayout align center of one view on top right corner of another view

This code creates what you are looking for but does use margins. Now you can set the margin in code if this is a dynamic structure you are creating. As you can see I used negative margins to move the upper right shape outside of the blue box. These need to be half the height of the circle you are trying to move. You can do all of this in code to center the circle in the upper right corner.

    <?xml version="1.0" encoding="utf-8"?>    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"        android:layout_width="wrap_content"        android:layout_height="wrap_content" >        <LinearLayout            android:id="@+id/linearLayout1"            android:layout_width="100dp"            android:layout_height="100dp"            android:layout_alignParentBottom="true"            android:layout_alignParentLeft="true"            android:background="#0000FF"            android:orientation="vertical" >        </LinearLayout>        <LinearLayout            android:layout_width="26dp"            android:layout_height="26dp"            android:layout_alignRight="@+id/linearLayout1"            android:layout_alignTop="@+id/linearLayout1"            android:layout_marginRight="-13dp"            android:layout_marginTop="-13dp"            android:background="#FF00FF"            android:orientation="vertical" >        </LinearLayout>    </RelativeLayout>

You could use ConstraintLayout circular positioning, just align your view on 45 degrees angle and adjust radius:

<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"    tools:context=".MainActivity">    <LinearLayout        android:background="@color/colorAccent"        android:id="@+id/view"        android:layout_width="100dp"        android:layout_height="100dp"        android:orientation="vertical"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintEnd_toEndOf="parent"        app:layout_constraintStart_toStartOf="parent"        app:layout_constraintTop_toTopOf="parent" />    <LinearLayout        android:background="@color/colorPrimary"        android:id="@+id/alignedView"        android:layout_width="30dp"        android:layout_height="30dp"        app:layout_constraintCircle="@id/view"        app:layout_constraintCircleAngle="45"        app:layout_constraintCircleRadius="60dp" /></androidx.constraintlayout.widget.ConstraintLayout>

Best and proper way to do:

<androidx.constraintlayout.widget.ConstraintLayout    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginTop="@dimen/_10sdp">    <View        android:id="@+id/viewBox"        android:layout_width="35dp"        android:layout_height="35dp"        android:background="@color/black"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent" />    <View        android:layout_width="15dp"        android:layout_height="15dp"        android:src="@drawable/ic_close"        app:layout_constraintBottom_toTopOf="@+id/viewBox"        app:layout_constraintLeft_toRightOf="@+id/viewBox"        app:layout_constraintRight_toRightOf="@+id/viewBox"        app:layout_constraintTop_toTopOf="@+id/viewBox" /></androidx.constraintlayout.widget.ConstraintLayout>