1/*
2 * Copyright (C) 2014 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 com.example.android.supportv7.app;
18
19import android.os.Bundle;
20import android.view.Gravity;
21import android.view.LayoutInflater;
22import android.view.Menu;
23import android.view.MenuInflater;
24import android.view.MenuItem;
25import android.view.View;
26import android.view.ViewGroup;
27import android.widget.TextView;
28import android.widget.Toast;
29
30import androidx.annotation.Nullable;
31import androidx.appcompat.app.AppCompatActivity;
32import androidx.appcompat.widget.Toolbar;
33import androidx.fragment.app.Fragment;
34import androidx.fragment.app.FragmentManager;
35import androidx.fragment.app.FragmentPagerAdapter;
36import androidx.viewpager.widget.ViewPager;
37
38import com.example.android.supportv7.R;
39
40import java.util.ArrayList;
41import java.util.List;
42
43/**
44 * Demonstrates how fragments can participate in the options menu from within a {@link ViewPager}.
45 */
46public class ToolbarFragmentPagerMenu extends AppCompatActivity {
47
48    @Override
49    protected void onCreate(Bundle savedInstanceState) {
50        super.onCreate(savedInstanceState);
51        setContentView(R.layout.toolbar_fragment_pager);
52
53        Toolbar toolbar = findViewById(R.id.toolbar);
54        setSupportActionBar(toolbar);
55
56        ViewPager vp = findViewById(R.id.viewpager);
57        PagerAdapter adapter = new PagerAdapter(getSupportFragmentManager(),
58                new MenuFragment(), new Menu2Fragment());
59        vp.setAdapter(adapter);
60    }
61
62    private static class PagerAdapter extends FragmentPagerAdapter {
63        private final List<Fragment> mFragments;
64
65        public PagerAdapter(FragmentManager fm, Fragment... fragments) {
66            super(fm);
67
68            mFragments = new ArrayList<Fragment>();
69            for (Fragment fragment : fragments) {
70                mFragments.add(fragment);
71            }
72        }
73
74        @Override
75        public Fragment getItem(int position) {
76            return mFragments.get(position);
77        }
78
79        @Override
80        public int getCount() {
81            return mFragments.size();
82        }
83    }
84
85    /**
86     * A fragment that displays a menu.  This fragment happens to not
87     * have a UI (it does not implement onCreateView), but it could also
88     * have one if it wanted.
89     */
90    public static class MenuFragment extends Fragment {
91        @Override
92        public void onCreate(Bundle savedInstanceState) {
93            super.onCreate(savedInstanceState);
94            setHasOptionsMenu(true);
95        }
96
97        @Override
98        public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
99            menu.add("Menu 1a").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
100            menu.add("Menu 1b").setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
101            super.onCreateOptionsMenu(menu, inflater);
102        }
103
104        @Override
105        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
106                @Nullable Bundle savedInstanceState) {
107            TextView textView = new TextView(container.getContext());
108
109            textView.setText(getClass().getSimpleName());
110            textView.setGravity(Gravity.CENTER);
111            textView.setLayoutParams(new ViewGroup.LayoutParams(
112                    ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
113
114            return textView;
115        }
116
117        @Override
118        public boolean onOptionsItemSelected(MenuItem item) {
119            if (item.getTitle().equals("Menu 1a")) {
120                Toast.makeText(getActivity(), "Selected Menu 1a.", Toast.LENGTH_SHORT).show();
121                return true;
122            }
123            if (item.getTitle().equals("Menu 1b")) {
124                Toast.makeText(getActivity(), "Selected Menu 1b.", Toast.LENGTH_SHORT).show();
125                return true;
126            }
127            return super.onOptionsItemSelected(item);
128        }
129    }
130
131    /**
132     * Second fragment with a menu.
133     */
134    public static class Menu2Fragment extends Fragment {
135        @Override
136        public void onCreate(Bundle savedInstanceState) {
137            super.onCreate(savedInstanceState);
138            setHasOptionsMenu(true);
139        }
140
141        @Override
142        public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
143            menu.add("Menu 2").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
144        }
145
146        @Override
147        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
148                @Nullable Bundle savedInstanceState) {
149            TextView textView = new TextView(container.getContext());
150
151            textView.setText(getClass().getSimpleName());
152            textView.setGravity(Gravity.CENTER);
153            textView.setLayoutParams(new ViewGroup.LayoutParams(
154                    ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
155
156            return textView;
157        }
158
159        @Override
160        public boolean onOptionsItemSelected(MenuItem item) {
161            if (item.getTitle().equals("Menu 2")) {
162                Toast.makeText(getActivity(), "Selected Menu 2.", Toast.LENGTH_SHORT).show();
163                return true;
164            }
165            return false;
166        }
167    }
168}
169