これは簡単だと思います。オーバーライドonLayoutメソッドBottomNavigationViewクラスの場合、拡張タグを使用できます。これはまた、すべてのメニュータイトルを表示し、シフトを無効にします。
public final class ExtendedBottomNavigationView extends BottomNavigationView{
private final Context context;
private Typeface fontFace = null;
public ExtendedBottomNavigationView(Context context, AttributeSet attrs){
super(context, attrs);
this.context = context;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom){
super.onLayout(changed, left, top, right, bottom);
final ViewGroup bottomMenu = (ViewGroup)getChildAt(0);
final int bottomMenuChildCount = bottomMenu.getChildCount();
BottomNavigationItemView item;
View itemTitle;
Field shiftingMode;
if(fontFace == null){
fontFace = Typeface.createFromAsset(context.getAssets(), context.getString(R.string.VazirBold));
}
try {
//if you want to disable shiftingMode:
//shiftingMode is a private member variable so you have to get access to it like this:
shiftingMode = bottomMenu.getClass().getDeclaredField("mShiftingMode");
shiftingMode.setAccessible(true);
shiftingMode.setBoolean(bottomMenu, false);
shiftingMode.setAccessible(false);
} catch (NoSuchFieldException e){
e.printStackTrace();
} catch (IllegalAccessException e){e.printStackTrace();}
for(int i=0; i<bottomMenuChildCount; i++){
item = (BottomNavigationItemView)bottomMenu.getChildAt(i);
//this shows all titles of items
item.setChecked(true);
//every BottomNavigationItemView has two children, first is an itemIcon and second is an itemTitle
itemTitle = item.getChildAt(1);
//every itemTitle has two children, first is a smallLabel and second is a largeLabel. these two are type of AppCompatTextView
((TextView)((BaselineLayout) itemTitle).getChildAt(0)).setTypeface(fontFace, Typeface.BOLD);
((TextView)((BaselineLayout) itemTitle).getChildAt(1)).setTypeface(fontFace, Typeface.BOLD);
}
}
}
次に、このようにそれを使用します。
<your.package.name.ExtendedBottomNavigationView android:id="@id/bottomMenu" style="@style/bottomMenu"/>
を参照してください[リンク](https://stackoverflow.com/a/10741161/1512199) – santalu
はい、私はこの答えを見ました。助けてくれてありがとう@santalu – sorunluadam