XML usage of menu, submenu, popupmenu, and contextmenu

Menu is introduced in android3.0. With the XML file of menu, we can quickly create a new menu file. Next we will introduce several commonly used menus one by one.

1. Call menu. Rewrite the two methods to implement it.

@ Override public Boolean oncreateoptionsmenu (menu) {// todo auto-generated method stub getmenuinflater (). inflate (R. menu. main, menu); // fill in the main. XML menu layout return Super. oncreateoptionsmenu (menu) ;}@ override public Boolean onoptionsitemselected (menuitem item) {// monitor the sub-item of the menu. // todo auto-generated method stub switch (item. getitemid () {case R. id. add: Toast. maketext (mainactivity. this, "add", toast. length_short ). show (); break; case R. id. edit: Toast. maketext (mainactivity. this, "edit", toast. length_short ). show (); break; case R. id. DEL: Toast. maketext (mainactivity. this, "Del", toast. length_short ). show (); break;} return Super. onoptionsitemselected (item );}

2. For more information about submenu usage, see the code and comments.

@ Override public Boolean onmenuitemselected (INT featureid, menuitem item) {// rewrite onmenuitemselected to monitor click events of sub-options. During my experiment, it is found that changing the topic will invalidate the sub-option // todo auto-generated method stub switch (item. getitemid () {case R. id. addall: Toast. maketext (mainactivity. this, "addall", toast. length_short ). show (); break; case R. id. addsomeone: Toast. maketext (mainactivity. this, "addsomeone", toast. length_short ). show (); break;} return Super. onmenuitemselected (featureid, item );}

 

3. popmenu usage

Declare in menu XML;

<Relativelayout xmlns: Android = "http://schemas.android.com/apk/res/android" xmlns: Tools = "http://schemas.android.com/tools" Android: layout_width = "match_parent" Android: layout_height = "match_parent" tools: context = "$ {packagename }. $ {activityclass} "><! -- Set the method body for triggering in the button --> <button Android: Id = "@ + ID/button1" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: layout_alignparenttop = "true" Android: layout_marginleft = "22dp" Android: layout_margintop = "45dp" Android: onclick = "showpopmenu" Android: TEXT = "pop-up menu"/> <listview Android: Id = "@ + ID/listview1" Android: layout_width = "match_parent" Android: layout_height = "wrap_content" Android: layout_alignparentleft = "true" Android: layout_below = "@ + ID/button1"> </listview> </relativelayout>

Implement the method body in the activity to achieve the pop-up effect

    public void showpopMenu(View view) {        PopupMenu popupMenu = new PopupMenu(context, view);        popupMenu.getMenuInflater().inflate(R.menu.menu1, popupMenu.getMenu());        popupMenu.show();    }

3. contextmenu. Rewrite two methods to achieve the contextmenu effect.

Public class mainactivity extends activity implements onitemlongclicklistener {private listview lv; private arrayadapter <string> marrayadapter; public context = mainactivity. this; @ override protected void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. activity_main); Init (); LV. setadapter (marrayadapter); registerforcontextmenu (LV);} void Init () {Lv = (listview) findviewbyid (R. id. listview1); marrayadapter = new arrayadapter <string> (context, android. r. layout. simple_list_item_1, getdata ();} public void showpopmenu (view) {popupmenu = new popupmenu (context, view); popupmenu. getmenuinflater (). inflate (R. menu. menu1, popupmenu. getmenu (); popupmenu. show () ;}list <string> getdata () {list <string> MList = new arraylist <string> (); For (INT I = 0; I <10; I ++) {MList. add ("minfan" + I);} return MList ;}@ override public Boolean oncontextitemselected (menuitem item) {// todo auto-generated method stub adaptercontextmenuinfo info = (adaptercontextmenuinfo) item. getmenuinfo (); string value = marrayadapter. getitem (info. position); // value indicates the item information in listview, used to locate switch (item. getitemid () {case R. id. item1: Toast. maketext (context, "Item1" + value, toast. length_short ). show (); break; case R. id. item2: Toast. maketext (context, "item2" + value, toast. length_short ). show (); break; case R. id. item3: Toast. maketext (context, "item3" + value, toast. length_short ). show (); break;} return Super. oncontextitemselected (item) ;}@ override public void oncreatecontextmenu (Android. view. contextmenu menu, view V, android. view. contextmenu. contextmenuinfo menuinfo) {getmenuinflater (). inflate (R. menu. menu1, menu );};}