ActionBarFragmentMenu.java revision ac5fe7c617c66850fff75a9fce9979c6e5674b0f 
1/*
2 * Copyright (C) 2013 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 androidx.fragment.app.Fragment;
21import androidx.fragment.app.FragmentManager;
22import androidx.fragment.app.FragmentTransaction;
23import androidx.appcompat.app.AppCompatActivity;
24import android.view.Menu;
25import android.view.MenuInflater;
26import android.view.MenuItem;
27import android.view.View;
28import android.view.View.OnClickListener;
29import android.widget.CheckBox;
30import android.widget.Toast;
31
32import com.example.android.supportv7.R;
33
34/**
35 * Demonstrates how fragments can participate in the options menu.
36 */
37public class ActionBarFragmentMenu extends AppCompatActivity {
38    MenuFragment mFragment1;
39    Menu2Fragment mFragment2;
40    CheckBox mCheckBox1;
41    CheckBox mCheckBox2;
42    CheckBox mCheckBox3;
43    CheckBox mHasOptionsMenu;
44    CheckBox mMenuVisibility;
45
46    // Update fragment visibility when check boxes are changed.
47    final OnClickListener mClickListener = new OnClickListener() {
48        @Override
49        public void onClick(View v) {
50            updateFragmentVisibility();
51        }
52    };
53
54    @Override
55    protected void onCreate(Bundle savedInstanceState) {
56        super.onCreate(savedInstanceState);
57        setContentView(R.layout.action_bar_fragment_menu);
58
59        // Make sure the two menu fragments are created.
60        FragmentManager fm = getSupportFragmentManager();
61        FragmentTransaction ft = fm.beginTransaction();
62        mFragment1 = (MenuFragment)fm.findFragmentByTag("f1");
63        if (mFragment1 == null) {
64            mFragment1 = new MenuFragment();
65            ft.add(mFragment1, "f1");
66        }
67        mFragment2 = (Menu2Fragment)fm.findFragmentByTag("f2");
68        if (mFragment2 == null) {
69            mFragment2 = new Menu2Fragment();
70            ft.add(mFragment2, "f2");
71        }
72        ft.commit();
73
74        // Watch check box clicks.
75        mCheckBox1 = (CheckBox)findViewById(R.id.menu1);
76        mCheckBox1.setOnClickListener(mClickListener);
77        mCheckBox2 = (CheckBox)findViewById(R.id.menu2);
78        mCheckBox2.setOnClickListener(mClickListener);
79        mCheckBox3 = (CheckBox)findViewById(R.id.menu3);
80        mCheckBox3.setOnClickListener(mClickListener);
81        mHasOptionsMenu = (CheckBox)findViewById(R.id.has_options_menu);
82        mHasOptionsMenu.setOnClickListener(mClickListener);
83        mMenuVisibility = (CheckBox)findViewById(R.id.menu_visibility);
84        mMenuVisibility.setOnClickListener(mClickListener);
85
86        // Make sure fragments start out with correct visibility.
87        updateFragmentVisibility();
88    }
89
90    @Override
91    protected void onRestoreInstanceState(Bundle savedInstanceState) {
92        super.onRestoreInstanceState(savedInstanceState);
93        // Make sure fragments are updated after check box view state is restored.
94        updateFragmentVisibility();
95    }
96
97    // Update fragment visibility based on current check box state.
98    void updateFragmentVisibility() {
99        // Update top level fragments.
100        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
101        if (mCheckBox1.isChecked()) ft.show(mFragment1);
102        else ft.hide(mFragment1);
103        if (mCheckBox2.isChecked()) ft.show(mFragment2);
104        else ft.hide(mFragment2);
105        ft.commit();
106
107        mFragment1.setHasOptionsMenu(mHasOptionsMenu.isChecked());
108        mFragment1.setMenuVisibility(mMenuVisibility.isChecked());
109        mFragment2.setHasOptionsMenu(mHasOptionsMenu.isChecked());
110        mFragment2.setMenuVisibility(mMenuVisibility.isChecked());
111
112        // Update the nested fragment.
113        if (mFragment2.mFragment3 != null) {
114            ft = mFragment2.getFragmentManager().beginTransaction();
115            if (mCheckBox3.isChecked()) ft.show(mFragment2.mFragment3);
116            else ft.hide(mFragment2.mFragment3);
117            ft.commit();
118
119            mFragment2.mFragment3.setHasOptionsMenu(mHasOptionsMenu.isChecked());
120            mFragment2.mFragment3.setMenuVisibility(mMenuVisibility.isChecked());
121        }
122    }
123
124    /**
125     * A fragment that displays a menu.  This fragment happens to not
126     * have a UI (it does not implement onCreateView), but it could also
127     * have one if it wanted.
128     */
129    public static class MenuFragment extends Fragment {
130        @Override
131        public void onCreate(Bundle savedInstanceState) {
132            super.onCreate(savedInstanceState);
133            setHasOptionsMenu(true);
134        }
135
136        @Override
137        public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
138            menu.add("Menu 1a").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
139            menu.add("Menu 1b").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
140            super.onCreateOptionsMenu(menu, inflater);
141        }
142
143        @Override
144        public boolean onOptionsItemSelected(MenuItem item) {
145            if (item.getTitle().equals("Menu 1a")) {
146                Toast.makeText(getActivity(), "Selected Menu 1a.", Toast.LENGTH_SHORT).show();
147                return true;
148            }
149            if (item.getTitle().equals("Menu 1b")) {
150                Toast.makeText(getActivity(), "Selected Menu 1b.", Toast.LENGTH_SHORT).show();
151                return true;
152            }
153            return super.onOptionsItemSelected(item);
154        }
155    }
156
157    /**
158     * Second fragment with a menu.
159     */
160    public static class Menu2Fragment extends Fragment {
161        Menu3Fragment mFragment3;
162
163        @Override
164        public void onCreate(Bundle savedInstanceState) {
165            super.onCreate(savedInstanceState);
166            setHasOptionsMenu(true);
167
168            FragmentManager fm = getChildFragmentManager();
169            FragmentTransaction ft = fm.beginTransaction();
170            mFragment3 = (Menu3Fragment)fm.findFragmentByTag("f3");
171            if (mFragment3 == null) {
172                mFragment3 = new Menu3Fragment();
173                ft.add(mFragment3, "f3");
174            }
175            ft.commit();
176        }
177
178        @Override
179        public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
180            menu.add("Menu 2").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
181        }
182
183        @Override
184        public boolean onOptionsItemSelected(MenuItem item) {
185            if (item.getTitle().equals("Menu 2")) {
186                Toast.makeText(getActivity(), "Selected Menu 2.", Toast.LENGTH_SHORT).show();
187                return true;
188            }
189            return false;
190        }
191    }
192
193    /**
194     * Third fragment with a menu.
195     * This one is nested within the second.
196     */
197    public static class Menu3Fragment extends Fragment {
198        @Override
199        public void onCreate(Bundle savedInstanceState) {
200            super.onCreate(savedInstanceState);
201            setHasOptionsMenu(true);
202        }
203
204        @Override
205        public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
206            Toast.makeText(getActivity(), "Created nested fragment's menu.",
207                    Toast.LENGTH_SHORT).show();
208            inflater.inflate(R.menu.display_options_actions, menu);
209            super.onCreateOptionsMenu(menu, inflater);
210        }
211
212        @Override
213        public void onDestroyOptionsMenu() {
214            Toast.makeText(getActivity(), "Destroyed nested fragment's menu.",
215                    Toast.LENGTH_SHORT).show();
216            super.onDestroyOptionsMenu();
217        }
218
219        @Override
220        public void onPrepareOptionsMenu(Menu menu) {
221            Toast.makeText(getActivity(), "Prepared nested fragment's menu.",
222                    Toast.LENGTH_SHORT).show();
223            super.onPrepareOptionsMenu(menu);
224        }
225
226        @Override
227        public boolean onOptionsItemSelected(MenuItem item) {
228            if (item.getItemId() == R.id.simple_item) {
229                Toast.makeText(getActivity(), "Selected nested fragment's menu item.",
230                        Toast.LENGTH_SHORT).show();
231                return true;
232            }
233            return super.onOptionsItemSelected(item);
234        }
235    }
236}
237