移除 BottomNavigationView 标签

Question

Google 发布了带有 BottomNavigationView 的新支持库 v25

有什么办法可以去掉物品标签吗？

Answer 1

希望我来这里参加派对还不算太晚。

但从设计支持库 28.0.0-alpha1 开始 您可以使用该属性

app:labelVisibilityMode="unlabeled"

您也可以使用其他值“auto”、“labeled”和“selected”。

Answer 2

你想要这种风格吗？

如果是这样，我建议你试试BottomNavigationViewEx。

Answer 3

不幸的是，BottomNavigationView 的第一个版本有很多限制。现在您不能仅使用支持设计 API 来删除标题。所以要解决这个限制，而谷歌没有实现它，你可以做（​​使用反射）：

1.在 bottom_navigation_menu.xml 文件中将标题设置为空。

2。扩展 BottomNavigationView：

    public class MyBottomNavigationView extends BottomNavigationView {

      public MyBottomNavigationView(Context context, AttributeSet attrs) {
          super(context, attrs);
          centerMenuIcon();
      }

      private void centerMenuIcon() {
          BottomNavigationMenuView menuView = getBottomMenuView();

          if (menuView != null) {
              for (int i = 0; i < menuView.getChildCount(); i++) {
                BottomNavigationItemView menuItemView = (BottomNavigationItemView) menuView.getChildAt(i);

                AppCompatImageView icon = (AppCompatImageView) menuItemView.getChildAt(0);

                FrameLayout.LayoutParams params = (LayoutParams) icon.getLayoutParams();
                params.gravity = Gravity.CENTER;

                menuItemView.setShiftingMode(true);
              }
          }
      }

      private BottomNavigationMenuView getBottomMenuView() {
          Object menuView = null;
          try {
              Field field = BottomNavigationView.class.getDeclaredField("mMenuView");
              field.setAccessible(true);
              menuView = field.get(this);
          } catch (NoSuchFieldException | IllegalAccessException e) {
              e.printStackTrace();
          }

          return (BottomNavigationMenuView) menuView;
      }
    }

3.在 layout.xml 中添加这个 customView

有关更多详细信息，我已在 Github 上实现此功能

Answer 4

1.在menu/abc.xml

中设置android:title="";

2. 创建下面使用反射的辅助类

import android.support.design.internal.BottomNavigationMenuView;
import android.support.design.widget.BottomNavigationView;
import android.support.v7.widget.AppCompatImageView;
import android.util.Log;
import android.view.Gravity;
import android.widget.FrameLayout;

import java.lang.reflect.Field;

public class BottomNavigationViewHelper {
    public static void disableShiftMode(BottomNavigationView view) {
        BottomNavigationMenuView menuView = (BottomNavigationMenuView) view.getChildAt(0);
        try {
            Field shiftingMode = menuView.getClass().getDeclaredField("mShiftingMode");
            shiftingMode.setAccessible(true);
            shiftingMode.setBoolean(menuView, false);
            shiftingMode.setAccessible(false);
            for (int i = 0; i < menuView.getChildCount(); i++) {
                BottomNavigationItemView item = (BottomNavigationItemView) menuView.getChildAt(i);
                //noinspection RestrictedApi
                item.setShiftingMode(false);
                item.setPadding(0, 15, 0, 0);
                // set once again checked value, so view will be updated
                //noinspection RestrictedApi
                item.setChecked(item.getItemData().isChecked());
            }
        } catch (NoSuchFieldException e) {
            Log.e("BNVHelper", "Unable to get shift mode field", e);
        } catch (IllegalAccessException e) {
            Log.e("BNVHelper", "Unable to change value of shift mode", e);
        }
    }
} 

3.在您的主要活动中，添加以下行：

mBottomNav = (BottomNavigationView) findViewById(R.id.navigation);
BottomNavigationViewHelper.disableShiftMode(mBottomNav);

Answer 5

无反思的方法：

private void removeTextLabel(@NonNull BottomNavigationView bottomNavigationView, @IdRes int menuItemId) {
    View view = bottomNavigationView.findViewById(menuItemId);
    if (view == null) return;
    if (view instanceof MenuView.ItemView) {
        ViewGroup viewGroup = (ViewGroup) view;
        int padding = 0;
        for (int i = 0; i < viewGroup.getChildCount(); i++) {
            View v = viewGroup.getChildAt(i);
            if (v instanceof ViewGroup) {
                padding = v.getHeight();
                viewGroup.removeViewAt(i);
            }
        }
        viewGroup.setPadding(view.getPaddingLeft(), (viewGroup.getPaddingTop() + padding) / 2, view.getPaddingRight(), view.getPaddingBottom());
    }
}

Answer 6

这是一个临时修复。只需添加：app:itemTextColor="@android:color/transparent" 无论背景颜色是什么，它都会显示为已禁用。它确实使图标看起来升高了。

Answer 7

我想同时删除 shift animation 和标签，但这里没有一个解决方案适合我，所以这是我根据我在这里学到的一切构建的解决方案：

public void removeLabels(@IdRes int... menuItemIds) {
    getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
        @Override public boolean onPreDraw() {
            getViewTreeObserver().removeOnPreDrawListener(this);

            // this only needs to be calculated once for an unchecked item, it'll be the same value for all items
            ViewGroup uncheckedItem = findFirstUncheckedItem(menuItemIds);
            View icon = uncheckedItem.getChildAt(0);
            int iconTopMargin = ((LayoutParams) uncheckedItem.getChildAt(0).getLayoutParams()).topMargin;
            int desiredTopMargin = (uncheckedItem.getHeight() - uncheckedItem.getChildAt(0).getHeight()) / 2;
            int itemTopPadding = desiredTopMargin - iconTopMargin;

            for (int id : menuItemIds) {
                ViewGroup item = findViewById(id);
                // remove the label
                item.removeViewAt(1);
                // and then center the icon
                item.setPadding(item.getPaddingLeft(), itemTopPadding, item.getPaddingRight(),
                        item.getPaddingBottom());
            }

            return true;
        }
    });
}

@SuppressLint("RestrictedApi")
private ViewGroup findFirstUncheckedItem(@IdRes int... menuItemIds) {
    BottomNavigationItemView item = findViewById(menuItemIds[0]);
    int i = 1;
    while (item.getItemData().isChecked()) {
        item = findViewById(menuItemIds[i++]);
    }
    return item;
}

只需将此方法添加到您的自定义 BottomNavigationView 并通过菜单项的 ID 调用它。

Answer 8

我建议您自己将其实现为sanf0rd gave in his answer。但是AppCompatImageView 不适合我。我已将其更改为ImageView。并将getChildAt 更改为findViewById。

我还隐藏了未选中项目的所有标签。

private void centerMenuIcon() {
    BottomNavigationMenuView menuView = getBottomMenuView();
    if (menuView != null) {
        for (int i = 0; i < menuView.getChildCount(); i++) {
            BottomNavigationItemView menuItemView = (BottomNavigationItemView) menuView.getChildAt(i);
            TextView smallText = (TextView) menuItemView.findViewById(R.id.smallLabel);
            smallText.setVisibility(View.INVISIBLE);
            //TextView largeText = (TextView) menuItemView.findViewById(R.id.largeLabel);
            ImageView icon = (ImageView) menuItemView.findViewById(R.id.icon);
            FrameLayout.LayoutParams params = (LayoutParams) icon.getLayoutParams();
            params.gravity = Gravity.CENTER;
            menuItemView.setShiftingMode(true);
        }
    }
}