ProjectLaogai/app/src/main/res/layouts/dialogs/layout/dialog_add_lesson.xml

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

</LinearLayout>