1/*
2 * Copyright (C) 2012 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.supportv4.app;
18
19import com.example.android.supportv4.R;
20
21import android.support.v4.app.Fragment;
22import android.support.v4.app.FragmentManager;
23import android.support.v4.app.FragmentTransaction;
24
25import android.os.Bundle;
26import android.view.LayoutInflater;
27import android.view.View;
28import android.view.ViewGroup;
29import android.view.View.OnClickListener;
30import android.widget.CheckBox;
31
32/**
33 * Demonstrates how fragments can participate in the options menu.
34 */
35public class FragmentMenuFragmentSupport extends Fragment {
36    Fragment mFragment1;
37    Fragment mFragment2;
38    CheckBox mCheckBox1;
39    CheckBox mCheckBox2;
40
41    // Update fragment visibility when check boxes are changed.
42    final OnClickListener mClickListener = new OnClickListener() {
43        public void onClick(View v) {
44            updateFragmentVisibility();
45        }
46    };
47
48    @Override
49    public View onCreateView(LayoutInflater inflater, ViewGroup container,
50            Bundle savedInstanceState) {
51        View v = inflater.inflate(R.layout.fragment_menu, container, false);
52
53        // Make sure the two menu fragments are created.
54        FragmentManager fm = getChildFragmentManager();
55        FragmentTransaction ft = fm.beginTransaction();
56        mFragment1 = fm.findFragmentByTag("f1");
57        if (mFragment1 == null) {
58            mFragment1 = new FragmentMenuSupport.MenuFragment();
59            ft.add(mFragment1, "f1");
60        }
61        mFragment2 = fm.findFragmentByTag("f2");
62        if (mFragment2 == null) {
63            mFragment2 = new FragmentMenuSupport.Menu2Fragment();
64            ft.add(mFragment2, "f2");
65        }
66        ft.commit();
67
68        // Watch check box clicks.
69        mCheckBox1 = (CheckBox)v.findViewById(R.id.menu1);
70        mCheckBox1.setOnClickListener(mClickListener);
71        mCheckBox2 = (CheckBox)v.findViewById(R.id.menu2);
72        mCheckBox2.setOnClickListener(mClickListener);
73
74        // Make sure fragments start out with correct visibility.
75        updateFragmentVisibility();
76
77        return v;
78    }
79
80    @Override
81    public void onViewStateRestored(Bundle savedInstanceState) {
82        super.onViewStateRestored(savedInstanceState);
83        // Make sure fragments are updated after check box view state is restored.
84        updateFragmentVisibility();
85    }
86
87    // Update fragment visibility based on current check box state.
88    void updateFragmentVisibility() {
89        FragmentTransaction ft = getChildFragmentManager().beginTransaction();
90        if (mCheckBox1.isChecked()) ft.show(mFragment1);
91        else ft.hide(mFragment1);
92        if (mCheckBox2.isChecked()) ft.show(mFragment2);
93        else ft.hide(mFragment2);
94        ft.commit();
95    }
96}
97