activity_animation_sample.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:orientation="vertical">

    <com.github.chrisbanes.photoview.PhotoView
        android:id="@+id/pvGif"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:src="@mipmap/pic_dog"
        android:tag="pic_dog" />

    <Button
        android:id="@+id/btnSwitchPic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Switch Pic"
        android:textAllCaps="false" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/btnHalfSpeed"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Half Speed"
            android:textAllCaps="false" />

        <Button
            android:id="@+id/btnNormalSpeed"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Normal Speed"
            android:textAllCaps="false" />

        <Button
            android:id="@+id/btnDoubleSpeed"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Double Speed"
            android:textAllCaps="false" />
    </LinearLayout>
</LinearLayout>