Android Notes: Menu

Using menu options, you need to do the following:
(1) Rewriting the Oncreateoptionsmenu method;

 Public Boolean  returntrue;}

(2) Add the item's declaration to the Main.xml file in menu.

(3) Overriding the onoptionsitemselected method

 Public Boolean  Switch  (Item.getitemid ()) {     case  item1:           break;       Case item2:           break;     ...      default :} return true ;}

The sample code mimics the first line of code

(1) The code for Menudemo.java is as follows:

 Public classMainactivityextendsActivity {@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);  Requestwindowfeature (Window.feature_no_title); //eliminate the title barSetcontentview (R.layout.activity_main); } @Override Public BooleanOncreateoptionsmenu (Menu menu) {//inflate the menu; This adds items to the action bar if it is present.getmenuinflater (). Inflate (R.menu.main, menu); return true; }        //defining Menu Response Events     Public Booleanonoptionsitemselected (MenuItem item) {Switch(Item.getitemid ()) { CaseR.id.riven:toast.maketext ( This, "The day of the Broken sword recasting, the time of its return!", Toast.length_short). Show ();  Break;  CaseR.id.ezreal:toast.maketext ( This, "It's time to perform the real technology!", Toast.length_short). Show ();  Break; default:                   }        return true; }    }

(2) Activity_main.xml in layout:

< TextView         Android:layout_width = "Wrap_content"         android:layout_height= "Wrap_content"        android:text= "Welcome to Summoner Canyon!" \ n Click the menu key to display the menu option "/>

(3) The Main.xml code in the menu:

<Menuxmlns:android= "Http://schemas.android.com/apk/res/android" >      <ItemAndroid:id= "@+id/riven"android:orderincategory= "+"android:showasaction= "Never"Android:title= "The Edge of Exile Rui Wen"/>      <ItemAndroid:id= "@+id/ezreal"android:orderincategory= "+"android:showasaction= "Never"Android:title= "@string/ezreal"/></Menu>

(4) in the string.xml of values, define a string constant.

<?XML version= "1.0" encoding= "Utf-8"?><Resources>    <stringname= "App_name">Menudemo</string>    <stringname= "Action_settings">Settings</string>    <stringname= "Hello_world">Hello world!</string>    <stringname= "Ezreal">Explorer Ezreal</string></Resources>

The code works as follows:

When you click the menu option, it appears as follows:

Android Notes: Menu