fragment_siswaku.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".siswaku"
    android:background="@drawable/back6"
    android:padding="20sp">

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_gravity="center_vertical|center_horizontal">
<ImageView

    android:id="@+id/imagelogo"
    android:layout_width="230dp"
    android:layout_height="280dp"
    android:src="@drawable/logo"
    android:layout_gravity="center"
    android:padding="20sp"
    android:layout_marginBottom="40dp"
    />

    <Button
        android:id="@+id/btnKategori"
        android:layout_width="300dp"
        android:layout_height="120dp"
        android:background="@color/white"

        android:text="CRUD siswa" />

</LinearLayout>

</FrameLayout>