Overview of the Android menu

Last Update:2015-06-15 Source: Internet

Author: User

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In android, the menu is divided into the following three types, the Options menu (optionsmenu), the context menu (ContextMenu), and the submenu (submenu).1. Options Menu (optionsmenu) detailedCommon methods that need to be overwritten in the activity:public boolean Oncreateoptionsmenu (menu menu): Use this method to create a optionsmenu. This method will only be executed when the option menu is displayed for the first Time.public boolean onoptionsitemselected (MenuItem item): The action that occurs after a menu item is Selected.public void onoptionsmenuclosed (menu menu): The action that occurs after the menus are Closed.public boolean Onprepareoptionsmenu (menu menu): the Options menu is displayed before the Onprepareoptionsmenu method is called, and you can use this method to adjust the menu according to the situation at the Time.public boolean onmenuopened (int featureid, menu menu): The action that occurs after a single Open.1) Create a menu<pre>@Overridepublicboolean oncreateoptionsmenu (menu menu) {//Call the parent class method to join the system menu, although currently Android does not have a system menu, but in order to be compatible with later versions, it is best to add 　　 Super. Oncreateoptionsmenu (menu); //3 Ways to add menu items//1. Direct designation of headingsMenu.add ("menu Item 1"); //2. Assigning headings through resourcesMenu.add (r.string.menuitem2); //3. Displays the group number, ID, sort number, title of the specified menu itemMenu.add (1,//group numbers so they can be grouped to quickly manipulate the same set of menus (such as Menu.removegroup (group1))menu.first,//Unique ID number, You can specify, you can also let the system to automatically assign, in the response menu you need to use the ID number to determine which menu was Clicked. menu.first,//the sort number, With the small number displayed in Front. "menu Item 3");//title//returns True if you want the menu to be displayed 　　 return true;}</pre>2) Response menu item<pre>@Overridepublicboolean onoptionsitemselected (MenuItem Item) {Switch(item.getitemid ()) {//respond to each menu item (by the ID of the menu Item)case1://do something here 　　　　 break; Case2://do something here 　　　　 break; Case3://do something here 　　　　 break; Case4://do something here 　　　　 break; default: //to the parent class to handle events that are not handledreturnsuper.onoptionsitemselected (item); } //returns true to indicate that the event of the menu item has been processed, and that the event does not need to be propagated anymore. 　　 return true;}</pre>You can also create listeners to respond to menu events prior to onoptionsitemselected execution<pre><pre>// first step: Create a listener class class Implements onmenuitemclicklistener { @Override publicboolean onmenuitemclick (MenuItem item) { // do something here ... return true; // Finish Handling }}// Second step: Register listener menuitem.setonmenuitemclicklistener for menu items (new Mymenuitemclicklistener ());　　　　</pre></pre>2. Context menu, Options menu, sub-menuA complete caseRes/layout/main.xml<pre><?XML version= "1.0" encoding= "utf-8"?><LinearLayoutxmlns:android= "http://schemas.android.com/apk/res/android"android:orientation= "vertical"Android:layout_width= "fill_parent"Android:layout_height= "fill_parent"> <TextViewAndroid:id= "@+id/txt1"Android:layout_width= "fill_parent"Android:layout_height= "wrap_content"Android:text= "@string/hello_contextmenu" /> <TextViewAndroid:id= "@+id/txt2"Android:layout_width= "fill_parent"Android:layout_height= "wrap_content"Android:text= "@string/hello_submenu" /> </LinearLayout></pre>Res/values/strings.xml<pre><?XML version= "1.0" encoding= "utf-8"?><Resources><StringName= "hello_contextmenu">hello Context Menu</string> <string name= " Hello_submenu ">hello Context Sub menu</string> <name= "app_name" >webabcd_menu</ string> </resources> </pre>Main.java<pre>Importandroid.app.Activity;Importandroid.os.Bundle;Importandroid.view.ContextMenu;Importandroid.view.Menu;Importandroid.view.MenuItem;Importandroid.view.SubMenu;Importandroid.view.View;Importandroid.view.ContextMenu.ContextMenuInfo;Importandroid.widget.TextView;Importandroid.widget.Toast;//demonstrates how the two menus are implemented: context menu (by long pressing on an element, to call out the Menu) and the Options menu (by pressing the menu button on the phone to call out the Menu) public classMainextendsActivity {/**Called when the activity is first Created.*/@Override public voidonCreate (Bundle Savedinstancestate) {Super. OnCreate (savedinstancestate); Setcontentview (r.layout.main); //Registers a context menu for R.id.txt1 (long Press on this TextView, the context menu is called Out)//The specific outbound menu content needs to be rewritten oncreatecontextmenu to createTextView txt1 = (TextView) this. Findviewbyid (r.id.txt1); this. Registerforcontextmenu (txt1); //Registering a context menu for R.ID.TXT2TextView txt2 = (TextView) this. Findviewbyid (r.id.txt2); this. Registerforcontextmenu (txt2); } //overriding Oncreatecontextmenu to create a context menu//overriding oncontextitemselected to respond to context menus@Override public voidoncreatecontextmenu (ContextMenu menu, View v, contextmenuinfo Menuinfo) {Super. Oncreatecontextmenu (menu, v, menuinfo); //Create a R.ID.TXT1 context menu if(v = = (TextView) this. Findviewbyid (r.id.txt1)) { //Contextmenu.seticon ()-icon for the Settings menu//Contextmenu.setheadertitle ()-set The title of the menuMenu.setheadericon (r.drawable.icon01); Menu.setheadertitle ("i am the menu"); //use Contextmenu.add () to add a menu item with a return value of MenuItem//First Parameter: Group ID//second parameter: menu item ID//third parameter: sequence number//Fourth Parameter: What is displayed on a menu itemMenu.add (1, 0, 0, "menu 1"); //MenuItem-returns type after new menu item, action on this object for other settingsMenu.add (1, 1, 1, "menu 2"). setcheckable (true); } //Create a context menu for R.ID.TXT2 (multilevel context Menu) Else if(v = = (TextView) this. Findviewbyid (r.id.txt2)) { //Contextmenu.addsubmenu ("menu name")-used to add sub-menus. A submenu is actually a special menu.submenu Sub = Menu.addsubmenu ("parent menu 1"); Sub.seticon (r.drawable.icon01); Sub.add (0, 0, 0, "menu 1"); Sub.add (0, 1, 1, "menu 2"); Sub.setgroupcheckable (1,true,true); submenu Sub2= Menu.addsubmenu ("parent Menu 2"); Sub2.seticon (r.drawable.icon01); Sub2.add (1, 0, 0, "menu 3"); Sub2.add (1, 1, 1, "menu 4"); Sub2.setgroupcheckable (1,true,false); } } //rewrite Oncreateoptionsmenu to create the Options menu@Override public Booleanoncreateoptionsmenu (menu menu) {MenuItem MenuItem= Menu.add (0, 0, 0, "menu 111111111111111111111"); //Menuitem.seticon ()-set The icon for the menu item//menuitem.settitlecondensed ()-the Simple title of the menu, if a simple title is specified, the title of the item will be subject to this simple title//Menuitem.setalphabeticshortcut ()-sets The shortcut key for this menu item to be selected//Note: If there are more than 6 menu items, the 6th menu will change to the more menu, and the extra menu will be displayed after clicking the more menu .Menuitem.seticon (r.drawable.icon01); Menuitem.settitlecondensed ("menu 1"); Menuitem.setalphabeticshortcut (A); Menu.add (0, 1, 1, "menu 2"). SetIcon (r.drawable.icon02); Menu.add (0, 2, 2, "menu 3"). SetIcon (r.drawable.icon03); Menu.add (0, 3, 3, "menu 4"); Menu.add (0, 4, 4, "menu 5"); Menu.add (0, 5, 5, "menu 6"); Menu.add (0, 6, 6, "menu 7"). SetIcon (r.drawable.icon04); Menu.add (0, 7, 7, "menu 8"). SetIcon (r.drawable.icon05); return true; } //overriding onoptionsitemselected to respond to the options menu@Override public Booleanonoptionsitemselected (MenuItem Item) {Super. onoptionsitemselected (item); Toast.maketext (Main. this, "the menu item clicked is:" +string.valueof (item.getitemid ()), toast.length_short). show (); return false; }}</pre>Overview of the Android menu

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Overview of the Android menu

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