Set multiple items for listview

First, define a class to associate the adapter and activity to remember the click position.

public class MyViewHoler{public CheckBox cb;public TextView tv;}

Ii. Adapter writing

Package COM. example. listviewcheckdemo; import Java. util. hashmap; import Java. util. list; import android. annotation. suppresslint; import android. content. context; import android. view. layoutinflater; import android. view. view; import android. view. viewgroup; import android. widget. baseadapter; import android. widget. checkbox; import android. widget. textview;/***** @ author liuziwei * select list adapter **/public class checkadapter extends baseadapter {public static hashmap <integer, Boolean> isselected; private context = NULL; private list <string> List = NULL; @ suppresslint ("usesparsearrays") Public checkadapter (context, list <string> List) {This. context = context; this. list = List; isselected = new hashmap <integer, Boolean> (); For (INT I = 0; I <list. size (); I ++) {isselected. put (I, false) ;}@overridepublic int getcount () {return list. size () ;}@ overridepublic object getitem (INT arg0) {return list. get (arg0) ;}@ overridepublic long getitemid (INT arg0) {return 0 ;}@ overridepublic view getview (INT position, view, viewgroup arg2) {myviewholer holder = NULL; if (view = NULL) {holder = new myviewholer (); view = layoutinflater. from (context ). inflate (R. layout. check_item, null); holder. TV = (textview) view. findviewbyid (R. id. item_ TV); holder. CB = (checkbox) view. findviewbyid (R. id. item_cb); view. settag (holder);} else {holder = (myviewholer) view. gettag ();} holder. TV. settext (list. get (position); holder. CB. setchecked (isselected. get (position); Return view ;}}

3. Writing in Activity

Public class mainactivity extends activity {private listview listview_check; private checkadapter adapter;/** initialization data */private list <string> newlist = new arraylist <string> (); /** store the selected data */private list <string> checklist = new arraylist <string> ();/** select all */private button btn_all; /** invert */private button btn_clear;/** deselect selected */private button btn_cancel; @ overrideprotected void oncreate (bundle savedinstancestate) {s Uper. oncreate (savedinstancestate); setcontentview (R. layout. activity_main); listview_check = (listview) findviewbyid (R. id. listview); btn_all = (button) findviewbyid (R. id. all); btn_clear = (button) findviewbyid (R. id. clear); btn_cancel = (button) findviewbyid (R. id. cancel);/** initialization data */For (INT I = 0; I <10; I ++) {newlist. add ("option" + I);} adapter = new checkadapter (this, newlist); listview_check.setadapter (adapter); listview_check. Setonitemclicklistener (New onitemclicklistener () {@ overridepublic void onitemclick (adapterview <?> Arg0, view, int position, long arg3) {// todo auto-generated method stubmyviewholer holder = (myviewholer) view. gettag (); holder. CB. toggle (); // Changes the checkbox status checkadapter every time you obtain the clicked item. isselected. put (Position, Holder. CB. ischecked (); // Changes the Save status of MAP values at the same time if (holder. CB. ischecked () = true) {checklist. add (newlist. get (position);} else {checklist. remove (newlist. get (position);} log. E ("----", "---------" + checklist. tostring () ;}});/** select all */btn_all.setonclicklistener (New onclicklistener () {@ overridepublic void onclick (view arg0) {checklist. clear (); For (INT I = 0; I <newlist. size (); I ++) {checkadapter. isselected. put (I, true); checklist. add (newlist. get (I);} adapter. notifydatasetchanged (); // note that this sentence must be added; otherwise, the checkbox cannot be updated normally});/** reselect */btn_clear.setonclicklistener (New onclicklistener () {@ overridepublic void onclick (view arg0) {for (INT I = 0; I <newlist. size (); I ++) {If (checkadapter. isselected. get (I) = false) {checkadapter. isselected. put (I, true); checklist. add (newlist. get (I);} else {checkadapter. isselected. put (I, false); checklist. remove (newlist. get (I) ;}} adapter. notifydatasetchanged () ;}});/** cancel selected */btn_cancel.setonclicklistener (New onclicklistener () {@ overridepublic void onclick (view arg0) {for (INT I = 0; I <newlist. size (); I ++) {If (checkadapter. isselected. get (I) = true) {checkadapter. isselected. put (I, false); checklist. remove (newlist. get (I) ;}} adapter. notifydatasetchanged ();}});}