Fragment and icon cannot be set dynamically

<eu.long1.spacetablayout.SpaceTabLayout
android:id="@+id/spaceTabLayout"
android:layout_width="match_parent"
android:layout_height="77dp"
android:layout_alignParentBottom="true"
android:gravity="bottom"
app:button_color="@color/colorAccent"
app:icon_five="@drawable/ic_ico_my"
app:icon_four="@drawable/design_ic_visibility"
app:icon_one="@drawable/ic_ico_home"
app:icon_three="@drawable/ic_ico_publish"
app:icon_two="@drawable/ic_ico_circle"
app:number_of_tabs="five"
app:starting_position="one"
app:layout_behavior="eu.long1.spacetablayout.SpaceTabLayoutBehavior"
app:tab_color="@color/colorPrimary"
app:text_color="#61FFFFFF" />

fragmentList.add(new HomeThis());
fragmentList.add(new Forum());
fragmentList.add(new Follow());
fragmentList.add(new Find());
fragmentList.add(new My_putstr());
spaceTabLayout.initialize(main_viewpager, getSupportFragmentManager(),
fragmentList, savedInstanceState);

You can only use XML to set icons，
spaceTabLayout.setTabOneIcon(R.drawable.ic_ico_home);
It will be a mistake
Prompt to reference null

Start with SpaceTabLayout and the setTabOneIcon(R.drawable.ic_ico_home) call shown in the issue, then compare it with the XML icon configuration. Reproduce the null-reference error when setting an icon dynamically after initialize. Done means the dynamic icon setter works without the error while the existing XML configuration continues to work.