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 package com.example.android.supportv7.app; 17 18 import android.os.Bundle; 19 import android.view.Menu; 20 import android.view.MenuItem; 21 import android.widget.Toast; 22 23 import androidx.appcompat.app.AppCompatActivity; 24 import androidx.core.view.WindowCompat; 25 26 /** 27 * This demonstrates the basics of the Action Bar and how it interoperates with the 28 * standard options menu. This demo is for informative purposes only; see ActionBarUsage for 29 * an example of using the Action Bar in a more idiomatic manner. 30 */ 31 public class ActionBarMechanics extends AppCompatActivity { 32 @Override 33 protected void onCreate(Bundle savedInstanceState) { 34 super.onCreate(savedInstanceState); 35 36 // The Action Bar is a window feature. The feature must be requested 37 // before setting a content view. Normally this is set automatically 38 // by your Activity's theme in your manifest. The provided system 39 // theme Theme.WithActionBar enables this for you. Use it as you would 40 // use Theme.NoTitleBar. You can add an Action Bar to your own themes 41 // by adding the element <item name="android:windowActionBar">true</item> 42 // to your style definition. 43 supportRequestWindowFeature(WindowCompat.FEATURE_ACTION_BAR); 44 } 45 46 @Override 47 public boolean onCreateOptionsMenu(Menu menu) { 48 // Menu items default to never show in the action bar. On most devices this means 49 // they will show in the standard options menu panel when the menu button is pressed. 50 // On xlarge-screen devices a "More" button will appear in the far right of the 51 // Action Bar that will display remaining items in a cascading menu. 52 menu.add("Normal item"); 53 54 MenuItem actionItem = menu.add("Action Button"); 55 56 // Items that show as actions should favor the "if room" setting, which will 57 // prevent too many buttons from crowding the bar. Extra items will show in the 58 // overflow area. 59 actionItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM); 60 61 // Items that show as actions are strongly encouraged to use an icon. 62 // These icons are shown without a text description, and therefore should 63 // be sufficiently descriptive on their own. 64 actionItem.setIcon(android.R.drawable.ic_menu_share); 65 return true; 66 } 67 68 @Override 69 public boolean onOptionsItemSelected(MenuItem item) { 70 Toast.makeText(this, "Selected Item: " + item.getTitle(), Toast.LENGTH_SHORT).show(); 71 return true; 72 } 73 } 74
