文件预览：fragment_secondarylibrary.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="match_parent" android:background="#FF0A9FA6"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="SecondaryLibraryFragment"/> </LinearLayout>