PopupMenu-----Popup Menu

1 ImportAndroid.os.Bundle;2 Importandroid.app.Activity;3 ImportAndroid.graphics.Color;4 ImportAndroid.view.Menu;5 ImportAndroid.view.MenuItem;6 ImportAndroid.view.View;7 ImportAndroid.widget.PopupMenu;8 ImportAndroid.widget.PopupMenu.OnMenuItemClickListener;9 ImportAndroid.widget.TextView;Ten  One  Public classMainactivityextendsActivity { A  -     PrivateTextView TextView; -     Private floatFontSize =15; the @Override -     protected voidonCreate (Bundle savedinstancestate) { -         Super. OnCreate (savedinstancestate); - Setcontentview (r.layout.activity_main); +          -TextView =(TextView) Findviewbyid (R.id.textview); +     } A     //The popup menu starts at 3.0, so the API is the lowest at      Public voidBtnclick (View v) -     { -         //The second parameter is the reference position of the pop-up menu display, which is usually displayed below the reference view -         //Create a popup menu object -PopupMenu pop =NewPopupMenu ( This, v); -          in         //to add a menu item to a menu - getmenuinflater (). Inflate (R.menu.main, Pop.getmenu ()); to          +         //adding event listeners to a menu item -Pop.setonmenuitemclicklistener (NewOnmenuitemclicklistener () { the              * @Override $              Public BooleanOnmenuitemclick (MenuItem item) {Panax Notoginseng                 Switch(Item.getitemid ()) -                 { the                      CaseR.id.action_add: +Fontsize+=5; A textview.settextsize (fontSize); the                          Break; +                      Caser.id.action_sub: -Fontsize-=5; $ textview.settextsize (fontSize); $                          Break; -                      CaseR.id.action_background: -                         intRed = (int) (Math.random () *256); the                         intGreen = (int) (Math.random () *256); -                         intBlue = (int) (Math.random () *256);Wuyi Textview.setbackgroundcolor (Color.rgb (red, green, blue)); the                          Break; -                 } Wu                 return false; -             } About         }); $          -         //Show Menu - pop.show (); -     } A  +}

mainactivity

1<menu xmlns:android= "Http://schemas.android.com/apk/res/android" >2 3<Item4Android:id= "@+id/action_add"5android:orderincategory= "100"6Android:showasaction= "Never"7android:title= "Enlarge font"/>8<Item9Android:id= "@+id/action_sub"Tenandroid:orderincategory= "100" OneAndroid:showasaction= "Never" Aandroid:title= "Shrink Font"/> -<Item -Android:id= "@+id/action_background" theandroid:orderincategory= "100" -Android:showasaction= "Never" -android:title= "Change background color"/> -  +</menu>

Menu_main

PopupMenu-----Popup Menu