Basic menu knowledge in android, androidmenu

Basic menu knowledge in android, androidmenu

(1) option menu

1. simple menu creation:

1 @ Override 2 public boolean onCreateOptionsMenu (Menu menu) {3 super. onCreateOptionsMenu (menu); 4 5 // Add menu 6 menu. add ("menu option 1"); 7/* 8 * pram1: group number pram2: Unique ID number pram3: Sorting number pram4: Title 9 */10 menu. add (1, Menu. FIRST, Menu. FIRST, "menu option 2"); 11 12 // if you want to display the menu, return true13 return true; 14}

2. Menu grouping and simple attributes:

1 @ Override 2 public boolean onCreateOptionsMenu (Menu menu) {3 super. onCreateOptionsMenu (menu); 4 5 int group1 = 1; 6 int group2 = 2; 7 menu. add (group1, 1, 1, "item1"); 8 menu. add (group1, 2, 2, "item2"); 9 menu. add (group2, 3, 3, "item3"); 10 menu. add (group2, 4, 4, "item4"); 11 12 // menu. removeGroup (group1); // delete a group 13 // menu. setGroupVisible (group1, false); // sets the visibility 14 // menu. setGroupEnabled (group2, false); // you can set whether to click 15. // menu. setGroupCheckable (group2, true, t); // sets the check box for a group of menus. 16 return true; 17}

3. Response menu

1. onOptionsItemSelected

1 @ Override 2 public boolean onOptionsItemSelected (MenuItem item) {3 // responds to each menu item (by the menu item ID) 4 switch (item. getItemId () {5 case 1: 6 // do something here 7 break; 8 case 2: 9 // do something here10 break; 11 case 3: 12 // do something here13 break; 14 case 4: 15 Toast. makeText (this, "hello", 0 ). show (); 16 break; 17 default: 18 // For unhandled events, hand it to the parent class for 19 return super. onOptionsItemSelected (item); 20} 21 // return true indicates that the menu item event has been processed and does not need to be propagated until 22 return true; 23}

2. Listening

1 // Step 1: Create listener class 2 class MyMenuItemClickListener implements OnMenuItemClickListener {3 @ Override 4 publicboolean onMenuItemClick (MenuItem item) {5 // do something here... 6 return true; // finish handling 7} 8} 9 // Step 2: register the listener 10 menuItem for the menu item. setOnMenuItemClickListener (new MyMenuItemClickListener ());

3. Use Intent

 

(2) subMenu

Note: A Menu can contain multiple submenus and menuitems. A SubMenu can contain multiple menuitems, but a SubMenu cannot contain submenus.

1 @ Override 2 public boolean onCreateOptionsMenu (Menu menu) {3 // you can add multiple sub-menus to a menu. 4 SubMenu subMenu = menu. addSubMenu (, 0, "sub menu"); 5 6 // Add multiple menu options in the sub menu 7 MenuItem menuItem1 = subMenu. add (1, 1, 0, "menu option 1"); 8 subMenu. add (1, 2, 1, "menu option 2"); 9 subMenu. add (1, 3, 2, "menu option 3"); 10 subMenu. add (1, 4, 3, "menu option 4"); 11 12 // The Sub-menu does not support displaying icons, although this setting does not return 13 submenus. setIcon (R. drawable. ic_launcher); 14 15 // set the menu option icon 16 menuItem1.setIcon (R. drawable. ic_launcher); 17 return true; 18}

 

(3) Context Menu ContextMenu

1 package com. zzw. contextMenu; 2 3 import android. app. activity; 4 import android. OS. bundle; 5 import android. util. log; 6 import android. view. contextMenu; 7 import android. view. contextMenu. contextMenuInfo; 8 import android. view. menuItem; 9 import android. view. view; 10 import android. widget. arrayAdapter; 11 import android. widget. listView; 12 import android. widget. toast; 13 14 public class MainActivity ex Tends Activity {15 private static final String TAG = "MainActivity"; 16 ListView; 17 18 @ Override19 protected void onCreate (Bundle savedInstanceState) {20 Log. d (TAG, "onCreate"); 21 22 super. onCreate (savedInstanceState); 23 setContentView (R. layout. activity_main); 24 listView = (ListView) findViewById (R. id. listView); 25 26 simpleShowList (); 27 // 1. register the context menu for a view in the onCreate method of the activity 28 this. regist ErForContextMenu (listView); 29 30} 31 32 // 2. Generate the context menu in onCreateContextMenu. 33 @ Override34 public void onCreateContextMenu (ContextMenu menu, View v, 35 ContextMenuInfo menuInfo) {36 Log. d (TAG, "onCreateContextMenu_start"); 37 38 menu. setHeaderTitle ("context menu title"); 39 menu. add (0, 1, 0, "option 1"); 40 menu. add (0, 2, 0, "option 2"); 41 menu. add (0, 3, 0, "option 3"); 42 43 Log. d (TAG, "onCreateContextMenu_stop"); 44} 45 46 // 3. respond to context menu items in onContextItemSelected. 47 @ Override48 public boolean onContextItemSelected (MenuItem item) {49 Log. d (TAG, "onContextItemSelected_start"); 50 int item_id = item. getItemId (); 51 switch (item_id) {52 case :53 Toast. makeText (this, "I am context menu option 1", 0 ). show (); 54 break; 55 case 2: 56 57 break; 58 case 3: 59 60 break; 61 62 default: 63 return super. onContextItemSelected (item); 64} 65 Log. d (TAG, "onContextItemSelected_stop"); 66 return true; 67} 68 69 private void simpleShowList () {70 Log. d (TAG, "simpleShowList_start"); 71 String [] showList = {"show 1", "show 2", "show 3", "Show 4 "}; 72 73 ArrayAdapter <String> adapter = new ArrayAdapter <String> (this, 74 android. r. layout. simple_expandable_list_item_1, showList); 75 76 listView. setAdapter (adapter); 77 Log. d (TAG, "simpleShowList_stop"); 78} 79 80}

 

 

(4) adding menus through XML files

1. Create a menu folder under the res File, which is usually existing by default. An Android xml File is generated to edit the menu.

2. Edit your own xml

1 <? Xml version = "1.0" encoding = "UTF-8"?> 2 <menu xmlns: android = "http://schemas.android.com/apk/res/android"> 3 4 <! -- Group is a group --> 5 <group android: id = "@ + id/group1"> 6 7 <! -- Item is a menu option --> 8 <item 9 android: id = "@ + id/item1" 10 android: title = "menu option 1 (sub menu) "> 11 <! -- Add a menu to an item as the sub menu --> 12 <menu> 13 <! -- Menu options in the sub-menu --> 14 <item15 android: icon = "@ drawable/ic_launcher" 16 android: id = "@ + id/item1_1" 17 android: title = "option 1"/> 18 <item19 android: id = "@ + id/item1_2" 20 android: title = "option 2 in the sub-menu"/> 21 </menu> 22 </item> 23 <item24 android: id = "@ + id/item2" 25 android: title = "menu option 2"> 26 </item> 27 </group> 28 <group android: id = "@ + id/group2"> 29 <item30 android: id = "@ + id/item3" 31 android: title = "menu option 4"> 32 </item> 33 <item34 android: id = "@ + id/item4" 35 android: title = "menu option 5"> 36 </item> 37 </group> 38 39 </menu>

3. Get in activity:

 1 @Override 2     public boolean onCreateOptionsMenu(Menu menu) { 3         MenuInflater in = getMenuInflater(); 4         in.inflate(R.menu.main, menu); 5         return true; 6     } 7  8     @Override 9     public boolean onOptionsItemSelected(MenuItem item) {10         switch (item.getItemId()) {11         case R.id.item1:12            13             break;14         case R.id.item2:15 16             break;17         18         default:19             return super.onOptionsItemSelected(item);20         }21 22         return true;23     }

 

 

Some basic attributes:

Set menu icon

1 <item 2 android: id = "@ + id/item1" 3 android: title = "menu option 1" 4 android: icon = "@ drawable/ic_launcher" 5/>

Optional menu options: android: checkableBehavior and chencked

1 <! -- CheckableBehavior settings are optional --> 2 <group android: id = "@ + id/group1" 3 android: checkableBehavior = "all"> 4 <! -- Checked: set a specific menu item (checked) --> 5 <item 6 android: id = "@ + id/item1" 7 android: title = "menu option 1" 8> 9 </item> 10 <item11 android: id = "@ + id/item2" 12 android: checked = "true" 13 android: title = "menu option 2"> 14 </item> 15 </group>

 

Set Menu availability unavailable android: enable

1 <group android: id = "@ + id/group1"> 2 <item 3 android: id = "@ + id/item1" 4 android: title = "menu option 1" 5 android: enabled = "true" 6> 7 </item> 8 <item 9 android: id = "@ + id/item2" 10 android: title = "menu option 2" 11 android: enabled = "false"> 12 </item> 13 </group>

 

Set whether menu options are visible android: visible

1 <group android: id = "@ + id/group1"> 2 <item 3 android: id = "@ + id/item1" 4 android: title = "menu option 1" 5 android: visible = "true" 6> 7 </item> 8 <item 9 android: id = "@ + id/item2" 10 android: title = "menu option 2" 11 android: visible = "false"> 12 </item> 13 </group> 14

See: http://www.cnblogs.com/codingmyworld/archive/2011/08/21/2147829.html