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