activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/background"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:layout_width="302dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:text="MixSound"
            android:textStyle="bold"
            android:textColor="#FFFF"
            android:textSize="60dp" />

        <ImageView
            android:layout_width="200dp"
            android:layout_height="200dp"
            android:background="@drawable/circle"
            android:src="@mipmap/mic" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_marginTop="190dp"
        android:orientation="horizontal">


        <ImageView
            android:layout_width="131dp"
            android:layout_height="100dp"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="50dp"
            android:background="@drawable/shape"
            android:src="@mipmap/snail" />

        <ImageView
            android:layout_width="131dp"
            android:layout_height="100dp"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="50dp"
            android:background="@drawable/shape"
            android:src="@mipmap/unicorn" />


    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:orientation="horizontal">

        <ImageView
            android:layout_width="131dp"
            android:layout_height="100dp"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="50dp"
            android:background="@drawable/shape"
            android:src="@mipmap/bird" />

        <ImageView
            android:layout_width="131dp"
            android:layout_height="100dp"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="50dp"
            android:background="@drawable/shape"
            android:src="@mipmap/lion" />


    </LinearLayout>

</LinearLayout>