activity_main.xml

<LinearLayout 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"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="@color/white"
    tools:context=".MainActivity">

    <com.weiwangcn.betterspinner.library.BetterSpinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/activity_vertical_margin"
        android:hint="BetterSpinner" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/activity_vertical_margin"
        android:hint="Text Field" />

    <com.weiwang.betterspinner.library.material.MaterialBetterSpinner
        android:id="@+id/spinner2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="MaterialBetterSpinner"
        app:floatingLabel="normal" />

    <com.rengwuxian.materialedittext.MaterialEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Text Field"
        app:floatingLabel="normal" />

</LinearLayout>