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.supportv4.app; 18 19 import com.example.android.supportv4.R; 20 21 import android.support.v4.app.Fragment; 22 import android.support.v4.app.FragmentManager; 23 import android.support.v4.app.FragmentTransaction; 24 25 import android.os.Bundle; 26 import android.view.LayoutInflater; 27 import android.view.View; 28 import android.view.ViewGroup; 29 import android.view.View.OnClickListener; 30 import android.widget.CheckBox; 31 32 /** 33 * Demonstrates how fragments can participate in the options menu. 34 */ 35 public 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 onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)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 onViewStateRestored(Bundle savedInstanceState)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. updateFragmentVisibility()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