Android - Why would Switch button on CursorAdaptor reset button immediately after a change -


i trying update boolean value in database table, based on switch. listview holds list of languages "install" switch button each. cursoradapter displaying list , switches. i've set oncheckedchangelisteners each switch. when select 1 of switches, briefly shows being switched on, reverts "off." in logging, see value set "true" , sent databaseprovider update database. thereafter, see log output value false, sent databaseprovider in update.

cursoradapter:

public static class viewholder {     public final textview nameview;     public final switch installswitch;      public viewholder(view view) {         nameview = (textview) view.findviewbyid(r.id.language_textview);         installswitch = (switch) view.findviewbyid(r.id.installed_switch);     } }  public languageadapter(context context, cursor c, int flags) {     super(context, c, flags); }  @override public view newview(context context, cursor cursor, viewgroup parent) {     view view = layoutinflater.from(context).inflate(r.layout.list_item_language, parent, false);     viewholder viewholder = new viewholder(view);     view.settag(viewholder);     return view; }  @override public void bindview(view view, context context, final cursor cursor) {      viewholder viewholder = (viewholder) view.gettag();     long languageid = cursor.getlong(0);     string word = cursor.getstring(1);     boolean langinstalled = boolean.parseboolean(cursor.getstring(2));     viewholder.nameview.settext(word);     viewholder.installswitch.setchecked(langinstalled);     viewholder.installswitch.settag(languageid);      viewholder.installswitch.setoncheckedchangelistener(new compoundbutton.oncheckedchangelistener() {         @override         public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) {             long languageid = (long) buttonview.gettag();             contentvalues cv = new contentvalues();             cv.put(translationcontract.languageentry.column_installed, ischecked);             log.d(log_tag, "onchecked, langid: " + languageid + " ischecked: " + ischecked);             buttonview.getcontext().getcontentresolver().update(translationcontract.languageentry.content_uri, cv, translationcontract.languageentry._id+"=?", new string[] {string.valueof(languageid)});        }     }); }

databaseprovider:

public int update(         uri uri, contentvalues values, string selection, string[] selectionargs) {     final sqlitedatabase db = mopenhelper.getwritabledatabase();     final int match = surimatcher.match(uri);     int rowsupdated;      switch (match) {         case languages:             rowsupdated = db.update(languageentry.table_name, values, selection,                     selectionargs);             log.d(log_tag, "updating languages: " + values.tostring());             break;  }

log:

07-13 21:39:32.785    languageadapter﹕ onchecked, langid: 2 ischecked: true 07-13 21:39:32.800    databaseprovider﹕ updating languages: installed=true 07-13 21:39:32.813    languageadapter﹕ onchecked, langid: 2 ischecked: false 07-13 21:39:32.825    databaseprovider﹕ updating languages: installed=false

after more digging, i've discovered 2 issues:

first, oncheckchanged seems called twice always, perhaps android bug? see following posts: oncheckedchanged fired multiple times, listview checkbox , checkbox changes value twice

instead, use onclicklistener.

the second issue here incorrect handling of boolean values between db cursor , java code. sqlite doesn't have native boolean type, values stored , returned integers 0 or 1. need evaluated , converted java boolean value.

the corrected code be: 

@override public void bindview(view view, context context, final cursor cursor) {      viewholder viewholder = (viewholder) view.gettag();     long languageid = cursor.getlong(0);     string word = cursor.getstring(1);     boolean langinstalled = cursor.getint(2)>0; //convert db 1 or 0 java boolean     viewholder.nameview.settext(word);     viewholder.installswitch.setchecked(langinstalled);     viewholder.installswitch.settag(languageid);     viewholder.installswitch.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             compoundbutton button = (compoundbutton) v;             long languageid = (long) button.gettag();             boolean ischecked = button.ischecked();             int dbboolean = 0;             if (button.ischecked()) {                 dbboolean = 1;             }             contentvalues cv = new contentvalues();             cv.put(translationcontract.languageentry.column_installed, dbboolean);             button.getcontext().getcontentresolver().update(translationcontract.languageentry.content_uri, cv, translationcontract.languageentry._id + "=?", new string[]{string.valueof(languageid)});             notifydatasetchanged();         }     }); }

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