tambah siswa

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".insert.InsertActivity">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">


        <EditText
            android:id="@+id/edt_nama"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPersonName"
            android:hint="Name" />
        <EditText
            android:layout_below="@+id/edt_nama"
            android:id="@+id/edt_kelas"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPersonName"
            android:hint="Kelas" />
        <EditText
            android:layout_below="@+id/edt_kelas"
            android:id="@+id/edt_email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPersonName"
            android:hint="Email" />

        <Button
            android:layout_below="@+id/edt_email"
            android:id="@+id/btn_tambah"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Tambah" />


    </RelativeLayout>
</android.support.constraint.ConstraintLayout>