BottomNavigationMenu.java revision 69557a3a037e4124ecbc98560e84fa89472b3bf4 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.design.internal;
18
19import static android.support.annotation.RestrictTo.Scope.GROUP_ID;
20
21import android.content.Context;
22import android.support.annotation.RestrictTo;
23import android.support.v7.view.menu.MenuBuilder;
24import android.support.v7.view.menu.MenuItemImpl;
25import android.view.MenuItem;
26import android.view.SubMenu;
27
28/**
29 * @hide
30 */
31@RestrictTo(GROUP_ID)
32public final class BottomNavigationMenu extends MenuBuilder {
33    public static final int MAX_ITEM_COUNT = 5;
34
35    public BottomNavigationMenu(Context context) {
36        super(context);
37    }
38
39    @Override
40    public SubMenu addSubMenu(int group, int id, int categoryOrder, CharSequence title) {
41        throw new UnsupportedOperationException("BottomNavigationView does not support submenus");
42    }
43
44    @Override
45    protected MenuItem addInternal(int group, int id, int categoryOrder, CharSequence title) {
46        if (size() + 1 > MAX_ITEM_COUNT) {
47            throw new IllegalArgumentException(
48                    "Maximum number of items supported by BottomNavigationView is " + MAX_ITEM_COUNT
49                            + ". Limit can be checked with BottomNavigationView#getMaxItemCount()");
50        }
51        stopDispatchingItemsChanged();
52        final MenuItem item = super.addInternal(group, id, categoryOrder, title);
53        if (item instanceof MenuItemImpl) {
54            ((MenuItemImpl) item).setExclusiveCheckable(true);
55        }
56        startDispatchingItemsChanged();
57        return item;
58    }
59}
60