fedilab-Android-App/app/src/main/res/layout/search_instance.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <AutoCompleteTextView
        android:id="@+id/search_instance"
        android:inputType="textWebEmailAddress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/instance"
        android:maxLines="1"
        />
</LinearLayout>