java - ListView not displaying text but displaying number (used SimpleAdapter) -

so i'm creating to-do app , i'm newbie @ java programming , android studio, hope can bear me.

here's mainactivity containing simpleadapter display list.

    listview lv;     arraylist<hashmap<string, string>> list;     protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_listview_main_activity);     lv=(listview)findviewbyid(r.id.listingtasks);      dbconnector db=new dbconnector(this);     list=new arraylist<hashmap<string,string>>();     list=db.display();     string[] from=new string[]{"_id","task"};     int[] to=new int[]{r.id.id,r.id.tasknamecustom1};      listadapter ad;     ad = new simpleadapter(listview_main_activity.this,list, r.layout.custom,from,to);     lv.setadapter(ad); 

the dbconnector class extends sqliteopenhelper class , contains methods insert , display records in sqlitedatabase. here's dbconnector class:

public class dbconnector extends sqliteopenhelper {  public cursor cr;  public dbconnector(context context) {     super(context, "database", null, 1); }    @override public void oncreate(sqlitedatabase db) {     string sqlquery = "create table tasktable(_id integer primary key autoincrement, task text);";     db.execsql(sqlquery); }  @override public void onupgrade(sqlitedatabase db, int oldversion, int newversion) {     string sqlqueryupgrade = "drop table if exists tasktable;";     db.execsql(sqlqueryupgrade);     oncreate(db); } 

here's display method within dbconnector class:

 public arraylist<hashmap<string,string>> display() {      arraylist<hashmap<string,string>> list = new arraylist<hashmap<string,string>>();     sqlitedatabase sb = this.getreadabledatabase();     string sql = "select * tasktable;";     cr = sb.rawquery(sql, null); //takes cursor position before first record     if (cr.movetofirst()) {         {             hashmap<string,string> hm = new hashmap<string,string>();              hm.put("_id", cr.getstring(0));             hm.put("task", cr.getstring(1));             list.add(hm);           } while (cr.movetonext());       }      return list;  } 

here's custom.xml file:

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent">  <textview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:textappearance="?android:attr/textappearancesmall"     android:text="small text"     android:id="@+id/id" />  <textview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:textappearance="?android:attr/textappearancelarge"     android:text="large text"     android:id="@+id/tasknamecustom1" /> 

there no syntactical errors. don't find red underlines anywhere , app runs on phone. problem listview of main activity displays number of tasks doesn't display text of task itself.

here's simpleadapter class:

public class simpleadapter extends baseadapter implements filterable,      themedspinneradapter { private final layoutinflater minflater;  private int[] mto; private string[] mfrom; private viewbinder mviewbinder;  private list<? extends map<string, ?>> mdata;  private int mresource; private int mdropdownresource;  /** layout inflater used {@link #getdropdownview(int, view, viewgroup)}. */ private layoutinflater mdropdowninflater;  private simplefilter mfilter; private arraylist<map<string, ?>> munfiltereddata;  /**  * constructor  *  * @param context context view associated simpleadapter running  * @param data list of maps. each entry in list corresponds 1 row in list.  *        maps contain data each row, , should include entries specified in  *        "from"  * @param resource resource identifier of view layout defines views list  *        item. layout file should include @ least named views defined in "to"  * @param list of column names added map associated each  *        item.  * @param views should display column in "from" parameter. these should  *        textviews. first n views in list given values of first n columns  *        in parameter.  */ public simpleadapter(context context, list<? extends map<string, ?>> data,         @layoutres int resource, string[] from, @idres int[] to) {     mdata = data;     mresource = mdropdownresource = resource;     mfrom = from;     mto = to;     minflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service); }  /**  * @see android.widget.adapter#getcount()  */ public int getcount() {     return mdata.size(); }  /**  * @see android.widget.adapter#getitem(int)  */ public object getitem(int position) {     return mdata.get(position); }  /**  * @see android.widget.adapter#getitemid(int)  */ public long getitemid(int position) {     return position; }  /**  * @see android.widget.adapter#getview(int, view, viewgroup)  */ public view getview(int position, view convertview, viewgroup parent) {     return createviewfromresource(minflater, position, convertview, parent, mresource); }  private view createviewfromresource(layoutinflater inflater, int position, view convertview,         viewgroup parent, int resource) {     view v;     if (convertview == null) {         v = inflater.inflate(resource, parent, false);     } else {         v = convertview;     }      bindview(position, v);      return v; }  /**  * <p>sets layout resource create drop down views.</p>  *  * @param resource layout resource defining drop down views  * @see #getdropdownview(int, android.view.view, android.view.viewgroup)  */ public void setdropdownviewresource(int resource) {     mdropdownresource = resource; }  /**  * sets {@link android.content.res.resources.theme} against drop-down views  * inflated.  * <p>  * default, drop-down views inflated against theme of  * {@link context} passed adapter's constructor.  *  * @param theme theme against inflate drop-down views or  *              {@code null} use theme adapter's context  * @see #getdropdownview(int, view, viewgroup)  */ @override public void setdropdownviewtheme(resources.theme theme) {     if (theme == null) {         mdropdowninflater = null;     } else if (theme == minflater.getcontext().gettheme()) {         mdropdowninflater = minflater;     } else {         final context context = new contextthemewrapper(minflater.getcontext(), theme);         mdropdowninflater = layoutinflater.from(context);     } }  @override public resources.theme getdropdownviewtheme() {     return mdropdowninflater == null ? null : mdropdowninflater.getcontext().gettheme(); }  @override public view getdropdownview(int position, view convertview, viewgroup parent) {     final layoutinflater inflater = mdropdowninflater == null ? minflater : mdropdowninflater;     return createviewfromresource(inflater, position, convertview, parent, mdropdownresource); }  private void bindview(int position, view view) {     final map dataset = mdata.get(position);     if (dataset == null) {         return;     }      final viewbinder binder = mviewbinder;     final string[] = mfrom;     final int[] = mto;     final int count = to.length;      (int = 0; < count; i++) {         final view v = view.findviewbyid(to[i]);         if (v != null) {             final object data = dataset.get(from[i]);             string text = data == null ? "" : data.tostring();             if (text == null) {                 text = "";             }              boolean bound = false;             if (binder != null) {                 bound = binder.setviewvalue(v, data, text);             }              if (!bound) {                 if (v instanceof checkable) {                     if (data instanceof boolean) {                         ((checkable) v).setchecked((boolean) data);                     } else if (v instanceof textview) {                         // note: keep instanceof textview check @ bottom of these                         // ifs since lot of views textviews (e.g. checkboxes).                         setviewtext((textview) v, text);                     } else {                         throw new illegalstateexception(v.getclass().getname() +                                 " should bound boolean, not " +                                 (data == null ? "<unknown type>" : data.getclass()));                     }                 } else if (v instanceof textview) {                     // note: keep instanceof textview check @ bottom of these                     // ifs since lot of views textviews (e.g. checkboxes).                     setviewtext((textview) v, text);                 } else if (v instanceof imageview) {                     if (data instanceof integer) {                         setviewimage((imageview) v, (integer) data);                                                 } else {                         setviewimage((imageview) v, text);                     }                 } else {                     throw new illegalstateexception(v.getclass().getname() + " not " +                             " view can bounds simpleadapter");                 }             }         }     } }  /**  * returns {@link viewbinder} used bind data views.  *  * @return viewbinder or null if binder not exist  *  * @see #setviewbinder(android.widget.simpleadapter.viewbinder)  */ public viewbinder getviewbinder() {     return mviewbinder; }  /**  * sets binder used bind data views.  *  * @param viewbinder binder used bind data views, can null  *        remove existing binder  *  * @see #getviewbinder()  */ public void setviewbinder(viewbinder viewbinder) {     mviewbinder = viewbinder; }  /**  * called bindview() set image imageview if  * there no existing viewbinder or if existing viewbinder cannot  * handle binding imageview.  *  * method called instead of {@link #setviewimage(imageview, string)}  * if supplied data int or integer.  *  * @param v imageview receive image  * @param value value retrieved data set  *  * @see #setviewimage(imageview, string)  */ public void setviewimage(imageview v, int value) {     v.setimageresource(value); }  /**  * called bindview() set image imageview if  * there no existing viewbinder or if existing viewbinder cannot  * handle binding imageview.  *  * default, value treated image resource. if  * value cannot used image resource, value used  * image uri.  *  * method called instead of {@link #setviewimage(imageview, int)}  * if supplied data not int or integer.  *  * @param v imageview receive image  * @param value value retrieved data set  *  * @see #setviewimage(imageview, int)   */ public void setviewimage(imageview v, string value) {     try {         v.setimageresource(integer.parseint(value));     } catch (numberformatexception nfe) {         v.setimageuri(uri.parse(value));     } }  /**  * called bindview() set text textview if  * there no existing viewbinder or if existing viewbinder cannot  * handle binding textview.  *  * @param v textview receive text  * @param text text set textview  */ public void setviewtext(textview v, string text) {     v.settext(text); }  public filter getfilter() {     if (mfilter == null) {         mfilter = new simplefilter();     }     return mfilter; }  /**  * class can used external clients of simpleadapter bind  * values views.  *  * should use class bind values views not  * directly supported simpleadapter or change way binding  * occurs views supported simpleadapter.  *  * @see simpleadapter#setviewimage(imageview, int)  * @see simpleadapter#setviewimage(imageview, string)  * @see simpleadapter#setviewtext(textview, string)  */ public static interface viewbinder {     /**      * binds specified data specified view.      *      * when binding handled viewbinder, method must return true.      * if method returns false, simpleadapter attempts handle      * binding on own.      *      * @param view view bind data      * @param data data bind view      * @param textrepresentation safe string representation of supplied data:      *        either result of data.tostring() or empty string      *        never null      *      * @return true if data bound view, false otherwise      */     boolean setviewvalue(view view, object data, string textrepresentation); }  /**  * <p>an array filters constrains content of array adapter  * prefix. each item not start supplied prefix  * removed list.</p>  */ private class simplefilter extends filter {      @override     protected filterresults performfiltering(charsequence prefix) {         filterresults results = new filterresults();          if (munfiltereddata == null) {             munfiltereddata = new arraylist<map<string, ?>>(mdata);         }          if (prefix == null || prefix.length() == 0) {             arraylist<map<string, ?>> list = munfiltereddata;             results.values = list;             results.count = list.size();         } else {             string prefixstring = prefix.tostring().tolowercase();              arraylist<map<string, ?>> unfilteredvalues = munfiltereddata;             int count = unfilteredvalues.size();              arraylist<map<string, ?>> newvalues = new arraylist<map<string, ?>>(count);              (int = 0; < count; i++) {                 map<string, ?> h = unfilteredvalues.get(i);                 if (h != null) {                      int len = mto.length;                      (int j=0; j<len; j++) {                         string str =  (string)h.get(mfrom[j]);                          string[] words = str.split(" ");                         int wordcount = words.length;                          (int k = 0; k < wordcount; k++) {                             string word = words[k];                              if (word.tolowercase().startswith(prefixstring)) {                                 newvalues.add(h);                                 break;                             }                         }                     }                 }             }              results.values = newvalues;             results.count = newvalues.size();         }          return results;     }      @override     protected void publishresults(charsequence constraint, filterresults results) {         //noinspection unchecked         mdata = (list<map<string, ?>>) results.values;         if (results.count > 0) {             notifydatasetchanged();         } else {             notifydatasetinvalidated();         }     } } 

}

can please please me? thank you!

hey first replace code in dbconnector in display method.

hm.put("_id", cr.getstring(0)); 

with

hm.put("_id", cr.getint(0)+""); 

and post getview() method of simple adapter, or whole class can further.

okk try replace

     string text = data == null ? "" : data.tostring(); 

with

     string text = data == null ? "" : (string)data; 

put code in

  view v;    if (convertview == null) {     v = inflater.inflate(resource, parent, false);     } else {     v = convertview;     }     bindview(position, v);      return v; 

into

  @override   public view getdropdownview(int position, view convertview, viewgroup        parent) { view v; if (convertview == null) {     v = inflater.inflate(resource, parent, false); } else {     v = convertview; }  bindview(position, v);  return v; 

}

hope work you.