1 /* 2 * Copyright (C) 2010 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.Activity; 22 import android.app.Fragment; 23 import android.app.FragmentManager; 24 import android.app.FragmentTransaction; 25 import android.os.Bundle; 26 import android.view.Menu; 27 import android.view.MenuInflater; 28 import android.view.MenuItem; 29 import android.view.View; 30 import android.view.View.OnClickListener; 31 import android.widget.CheckBox; 32 33 /** 34 * Demonstrates how fragments can participate in the options menu. 35 */ 36 public class FragmentMenu extends Activity { 37 Fragment mFragment1; 38 Fragment mFragment2; 39 CheckBox mCheckBox1; 40 CheckBox mCheckBox2; 41 42 // Update fragment visibility when check boxes are changed. 43 final OnClickListener mClickListener = new OnClickListener() { 44 public void onClick(View v) { 45 updateFragmentVisibility(); 46 } 47 }; 48 49 @Override onCreate(Bundle savedInstanceState)50 protected void onCreate(Bundle savedInstanceState) { 51 super.onCreate(savedInstanceState); 52 setContentView(R.layout.fragment_menu); 53 54 // Make sure the two menu fragments are created. 55 FragmentManager fm = getFragmentManager(); 56 FragmentTransaction ft = fm.beginTransaction(); 57 mFragment1 = fm.findFragmentByTag("f1"); 58 if (mFragment1 == null) { 59 mFragment1 = new MenuFragment(); 60 ft.add(mFragment1, "f1"); 61 } 62 mFragment2 = fm.findFragmentByTag("f2"); 63 if (mFragment2 == null) { 64 mFragment2 = new Menu2Fragment(); 65 ft.add(mFragment2, "f2"); 66 } 67 ft.commit(); 68 69 // Watch check box clicks. 70 mCheckBox1 = (CheckBox)findViewById(R.id.menu1); 71 mCheckBox1.setOnClickListener(mClickListener); 72 mCheckBox2 = (CheckBox)findViewById(R.id.menu2); 73 mCheckBox2.setOnClickListener(mClickListener); 74 75 // Make sure fragments start out with correct visibility. 76 updateFragmentVisibility(); 77 } 78 79 @Override onRestoreInstanceState(Bundle savedInstanceState)80 protected void onRestoreInstanceState(Bundle savedInstanceState) { 81 super.onRestoreInstanceState(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. updateFragmentVisibility()87 void updateFragmentVisibility() { 88 FragmentTransaction ft = getFragmentManager().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 /** 97 * A fragment that displays a menu. This fragment happens to not 98 * have a UI (it does not implement onCreateView), but it could also 99 * have one if it wanted. 100 */ 101 public static class MenuFragment extends Fragment { 102 103 @Override onCreate(Bundle savedInstanceState)104 public void onCreate(Bundle savedInstanceState) { 105 super.onCreate(savedInstanceState); 106 setHasOptionsMenu(true); 107 } 108 109 @Override onCreateOptionsMenu(Menu menu, MenuInflater inflater)110 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 111 menu.add("Menu 1a").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM); 112 menu.add("Menu 1b").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM); 113 } 114 } 115 116 /** 117 * Second fragment with a menu. 118 */ 119 public static class Menu2Fragment extends Fragment { 120 121 @Override onCreate(Bundle savedInstanceState)122 public void onCreate(Bundle savedInstanceState) { 123 super.onCreate(savedInstanceState); 124 setHasOptionsMenu(true); 125 } 126 127 @Override onCreateOptionsMenu(Menu menu, MenuInflater inflater)128 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 129 menu.add("Menu 2").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM); 130 } 131 } 132 } 133