How to force BottomNavigationView label to multiline

Question

I have a BottomNavigationView with a long label text and it's not showing the full label.

I found that the label on BottomNavigationView has a maxLines="1", but I don't know how to modify it to allow 2 lines label.

Answer 1

Currently there isn't a way to change the android:maxLines="1" used by the items in BottomNavigationMenuView.

It is a workaround and it can stop to work with the future releases.

BottomNavigationMenuView menuView = (BottomNavigationMenuView) bottomNavigationView.getChildAt(0);

for (int i = 0; i < menuView.getChildCount(); i++) {
      BottomNavigationItemView item = (BottomNavigationItemView) menuView.getChildAt(i);
      TextView smallLabel = item.findViewById(R.id.smallLabel);
      TextView largeLabel = item.findViewById(R.id.largeLabel);

      smallLabel.setMaxLines(2);
      largeLabel.setMaxLines(2);
}

Just to explain.
It is the layout used by the BottomNavigationView. Here you can find:

<merge xmlns:android="http://schemas.android.com/apk/res/android">
  <ImageView
      android:id="@+id/icon"
      ../>
  <com.google.android.material.internal.BaselineLayout
    ..>
    <TextView
        android:id="@+id/smallLabel"
        android:maxLines="1" 
        ../>
    <TextView
        android:id="@+id/largeLabel"
        android:maxLines="1"
        .../>
  </com.google.android.material.internal.BaselineLayout>
</merge>