很不幸,BottomNavigationView的第一个版本存在许多限制。目前,您无法仅使用支持设计API删除标题。因此,在谷歌实现它之前解决这个限制,您可以使用反射执行以下操作:
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. 将这个自定义视图添加到layout.xml中
更多细节可以查看我在Github上实现的示例代码
findViewById()
来获取每个BottomNavigationItemView
(就像@NikolaDespotoski在他的答案中所做的那样)。 - Fred Porciúnculaapp:labelVisibilityMode="unlabeled"
。 - Amjad Alwareh1. 在menu/abc.xml中设置android:title="";
2. 创建以下使用反射的辅助类
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. 在你的主活动中,添加以下行:
mBottomNav = (BottomNavigationView) findViewById(R.id.navigation);
BottomNavigationViewHelper.disableShiftMode(mBottomNav);
无反射方法:
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());
}
}
app:itemTextColor="@android:color/transparent"
,这将使它呈现禁用状态与背景颜色相同。它确实使图标看起来更突出。我想要去掉底部导航栏的 移动动画 和标签,但这里的解决方案都不太适用于我,所以我根据在这里学到的一切制作了自己的解决方案:
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;
}
BottomNavigationView
中,并传递菜单项的ID即可。AppCompatImageView
对我来说不起作用。我将它改为了ImageView
。并将getChildAt
改为findViewById
。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);
}
}
}
layout_marginBottom="-16dp"
可以移除此内边距,但也会使所有视图变小。 - dzikovskyyandroid:paddingTop="8dp" android:layout_marginBottom="-8dp"
这可以防止该条变得更小。 - Palm