Compass/app/src/main/res/layout/activity_main.xml

<?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"
    tools:context=".MainActivity">

        <LinearLayout
            android:id="@+id/view_compass"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:background="@mipmap/background_light"
            android:orientation="vertical"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="0dip"
                android:layout_weight="1"
                android:orientation="vertical">

                <FrameLayout
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:background="@mipmap/prompt">

                    <LinearLayout
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center_horizontal"
                        android:layout_marginTop="70dip"
                        android:orientation="horizontal">

                        <LinearLayout
                            android:id="@+id/layout_direction"
                            android:layout_width="0dip"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:gravity="right"
                            android:orientation="horizontal" />

                        <ImageView
                            android:layout_width="20dip"
                            android:layout_height="fill_parent"/>

                        <LinearLayout
                            android:id="@+id/layout_angle"
                            android:layout_width="0dip"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:gravity="left"
                            android:orientation="horizontal" />
                    </LinearLayout>
                </FrameLayout>

                <LinearLayout
                    android:layout_width="fill_parent"
                    android:layout_height="0dip"
                    android:layout_weight="1"
                    android:orientation="vertical">

                    <FrameLayout
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center">

                        <ImageView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_gravity="center"
                            android:src="@mipmap/background_compass" />

                        <me.yoqi.android.compass.ui.CompassView
                            android:id="@+id/compass_pointer"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_gravity="center"
                            android:src="@mipmap/compass" />

                        <ImageView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_gravity="center"
                            android:src="@mipmap/miui_cover" />
                    </FrameLayout>
                </LinearLayout>
            </LinearLayout>

            <FrameLayout
                android:id="@+id/location_layout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content">

                <LinearLayout
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:background="@mipmap/background_bottom"
                    android:orientation="vertical"/>

                <TextView
                    android:id="@+id/textview_location"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:text="@string/getting_location"
                    android:textAppearance="?android:attr/textAppearanceMedium"
                    android:textColor="#7FFFFFFF" />
            </FrameLayout>
        </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>