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 17 package com.example.android.supportv7.app; 18 19 import com.example.android.supportv7.R; 20 21 import android.os.Bundle; 22 import android.support.v4.app.Fragment; 23 import android.support.v4.app.FragmentManager; 24 import android.support.v4.app.FragmentTransaction; 25 import android.support.v4.view.MenuItemCompat; 26 import android.support.v7.app.AppCompatActivity; 27 import android.view.Menu; 28 import android.view.MenuInflater; 29 import android.view.MenuItem; 30 import android.view.View; 31 import android.view.View.OnClickListener; 32 import android.widget.CheckBox; 33 import android.widget.Toast; 34 35 /** 36 * Demonstrates how fragments can participate in the options menu. 37 */ 38 public class ActionBarFragmentMenu extends AppCompatActivity { 39 MenuFragment mFragment1; 40 Menu2Fragment mFragment2; 41 CheckBox mCheckBox1; 42 CheckBox mCheckBox2; 43 CheckBox mCheckBox3; 44 CheckBox mHasOptionsMenu; 45 CheckBox mMenuVisibility; 46 47 // Update fragment visibility when check boxes are changed. 48 final OnClickListener mClickListener = new OnClickListener() { 49 @Override 50 public void onClick(View v) { 51 updateFragmentVisibility(); 52 } 53 }; 54 55 @Override onCreate(Bundle savedInstanceState)56 protected void onCreate(Bundle savedInstanceState) { 57 super.onCreate(savedInstanceState); 58 setContentView(R.layout.action_bar_fragment_menu); 59 60 // Make sure the two menu fragments are created. 61 FragmentManager fm = getSupportFragmentManager(); 62 FragmentTransaction ft = fm.beginTransaction(); 63 mFragment1 = (MenuFragment)fm.findFragmentByTag("f1"); 64 if (mFragment1 == null) { 65 mFragment1 = new MenuFragment(); 66 ft.add(mFragment1, "f1"); 67 } 68 mFragment2 = (Menu2Fragment)fm.findFragmentByTag("f2"); 69 if (mFragment2 == null) { 70 mFragment2 = new Menu2Fragment(); 71 ft.add(mFragment2, "f2"); 72 } 73 ft.commit(); 74 75 // Watch check box clicks. 76 mCheckBox1 = (CheckBox)findViewById(R.id.menu1); 77 mCheckBox1.setOnClickListener(mClickListener); 78 mCheckBox2 = (CheckBox)findViewById(R.id.menu2); 79 mCheckBox2.setOnClickListener(mClickListener); 80 mCheckBox3 = (CheckBox)findViewById(R.id.menu3); 81 mCheckBox3.setOnClickListener(mClickListener); 82 mHasOptionsMenu = (CheckBox)findViewById(R.id.has_options_menu); 83 mHasOptionsMenu.setOnClickListener(mClickListener); 84 mMenuVisibility = (CheckBox)findViewById(R.id.menu_visibility); 85 mMenuVisibility.setOnClickListener(mClickListener); 86 87 // Make sure fragments start out with correct visibility. 88 updateFragmentVisibility(); 89 } 90 91 @Override onRestoreInstanceState(Bundle savedInstanceState)92 protected void onRestoreInstanceState(Bundle savedInstanceState) { 93 super.onRestoreInstanceState(savedInstanceState); 94 // Make sure fragments are updated after check box view state is restored. 95 updateFragmentVisibility(); 96 } 97 98 // Update fragment visibility based on current check box state. updateFragmentVisibility()99 void updateFragmentVisibility() { 100 // Update top level fragments. 101 FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 102 if (mCheckBox1.isChecked()) ft.show(mFragment1); 103 else ft.hide(mFragment1); 104 if (mCheckBox2.isChecked()) ft.show(mFragment2); 105 else ft.hide(mFragment2); 106 ft.commit(); 107 108 mFragment1.setHasOptionsMenu(mHasOptionsMenu.isChecked()); 109 mFragment1.setMenuVisibility(mMenuVisibility.isChecked()); 110 mFragment2.setHasOptionsMenu(mHasOptionsMenu.isChecked()); 111 mFragment2.setMenuVisibility(mMenuVisibility.isChecked()); 112 113 // Update the nested fragment. 114 if (mFragment2.mFragment3 != null) { 115 ft = mFragment2.getFragmentManager().beginTransaction(); 116 if (mCheckBox3.isChecked()) ft.show(mFragment2.mFragment3); 117 else ft.hide(mFragment2.mFragment3); 118 ft.commit(); 119 120 mFragment2.mFragment3.setHasOptionsMenu(mHasOptionsMenu.isChecked()); 121 mFragment2.mFragment3.setMenuVisibility(mMenuVisibility.isChecked()); 122 } 123 } 124 125 /** 126 * A fragment that displays a menu. This fragment happens to not 127 * have a UI (it does not implement onCreateView), but it could also 128 * have one if it wanted. 129 */ 130 public static class MenuFragment extends Fragment { 131 @Override onCreate(Bundle savedInstanceState)132 public void onCreate(Bundle savedInstanceState) { 133 super.onCreate(savedInstanceState); 134 setHasOptionsMenu(true); 135 } 136 137 @Override onCreateOptionsMenu(Menu menu, MenuInflater inflater)138 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 139 MenuItemCompat.setShowAsAction(menu.add("Menu 1a"), MenuItem.SHOW_AS_ACTION_IF_ROOM); 140 MenuItemCompat.setShowAsAction(menu.add("Menu 1b"), MenuItem.SHOW_AS_ACTION_IF_ROOM); 141 super.onCreateOptionsMenu(menu, inflater); 142 } 143 144 @Override onOptionsItemSelected(MenuItem item)145 public boolean onOptionsItemSelected(MenuItem item) { 146 if (item.getTitle().equals("Menu 1a")) { 147 Toast.makeText(getActivity(), "Selected Menu 1a.", Toast.LENGTH_SHORT).show(); 148 return true; 149 } 150 if (item.getTitle().equals("Menu 1b")) { 151 Toast.makeText(getActivity(), "Selected Menu 1b.", Toast.LENGTH_SHORT).show(); 152 return true; 153 } 154 return super.onOptionsItemSelected(item); 155 } 156 } 157 158 /** 159 * Second fragment with a menu. 160 */ 161 public static class Menu2Fragment extends Fragment { 162 Menu3Fragment mFragment3; 163 164 @Override onCreate(Bundle savedInstanceState)165 public void onCreate(Bundle savedInstanceState) { 166 super.onCreate(savedInstanceState); 167 setHasOptionsMenu(true); 168 169 FragmentManager fm = getChildFragmentManager(); 170 FragmentTransaction ft = fm.beginTransaction(); 171 mFragment3 = (Menu3Fragment)fm.findFragmentByTag("f3"); 172 if (mFragment3 == null) { 173 mFragment3 = new Menu3Fragment(); 174 ft.add(mFragment3, "f3"); 175 } 176 ft.commit(); 177 } 178 179 @Override onCreateOptionsMenu(Menu menu, MenuInflater inflater)180 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 181 MenuItemCompat.setShowAsAction(menu.add("Menu 2"), MenuItem.SHOW_AS_ACTION_IF_ROOM); 182 } 183 184 @Override onOptionsItemSelected(MenuItem item)185 public boolean onOptionsItemSelected(MenuItem item) { 186 if (item.getTitle().equals("Menu 2")) { 187 Toast.makeText(getActivity(), "Selected Menu 2.", Toast.LENGTH_SHORT).show(); 188 return true; 189 } 190 return false; 191 } 192 } 193 194 /** 195 * Third fragment with a menu. 196 * This one is nested within the second. 197 */ 198 public static class Menu3Fragment extends Fragment { 199 @Override onCreate(Bundle savedInstanceState)200 public void onCreate(Bundle savedInstanceState) { 201 super.onCreate(savedInstanceState); 202 setHasOptionsMenu(true); 203 } 204 205 @Override onCreateOptionsMenu(Menu menu, MenuInflater inflater)206 public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 207 Toast.makeText(getActivity(), "Created nested fragment's menu.", 208 Toast.LENGTH_SHORT).show(); 209 inflater.inflate(R.menu.display_options_actions, menu); 210 super.onCreateOptionsMenu(menu, inflater); 211 } 212 213 @Override onDestroyOptionsMenu()214 public void onDestroyOptionsMenu() { 215 Toast.makeText(getActivity(), "Destroyed nested fragment's menu.", 216 Toast.LENGTH_SHORT).show(); 217 super.onDestroyOptionsMenu(); 218 } 219 220 @Override onPrepareOptionsMenu(Menu menu)221 public void onPrepareOptionsMenu(Menu menu) { 222 Toast.makeText(getActivity(), "Prepared nested fragment's menu.", 223 Toast.LENGTH_SHORT).show(); 224 super.onPrepareOptionsMenu(menu); 225 } 226 227 @Override onOptionsItemSelected(MenuItem item)228 public boolean onOptionsItemSelected(MenuItem item) { 229 if (item.getItemId() == R.id.simple_item) { 230 Toast.makeText(getActivity(), "Selected nested fragment's menu item.", 231 Toast.LENGTH_SHORT).show(); 232 return true; 233 } 234 return super.onOptionsItemSelected(item); 235 } 236 } 237 } 238