app/src/main/res/layout/fragment_weather.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- This linear layout is used to show elements
in vertical or in horizontal linear manner -->
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<Button
android:id="@+id/open_weather"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/weather" />
</LinearLayout>