android - non-empty constructor issue -

i have tried make non empty constructor no success. eclipse says :

from fragment documentation: every fragment must have empty constructor, can instantiated when restoring activity's state. recommended subclasses not have other constructors parameters, since these constructors not called when fragment re-instantiated; instead, arguments can supplied caller setarguments(bundle) , later retrieved fragment getarguments().

so how can make non empty constructor? here code :

import java.util.arraylist; import java.util.list; import android.annotation.suppresslint; import android.content.context; import android.os.bundle; import android.app.listfragment; import android.app.loadermanager.loadercallbacks; import android.content.asynctaskloader; import android.content.loader; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.arrayadapter; import android.widget.textview;   public class mylistfragment extends listfragment implements     loadercallbacks<void> {  private static final string tag = "fragmenttabs";  private string mtag; private myadapter madapter; private arraylist<string> mitems; private layoutinflater minflater; private int mtotal; private int mposition;  private static final string[] = { "lorem", "ipsum", "dolor", "sit",         "amet", "consectetur", "adipiscing", "elit", "fusce", "pharetra",         "luctus", "sodales" }; private static final string[] faq = { "i", "ii", "iii", "iv", "v",         "vi", "vii", "viii", "ix", "x", "xi", "xii", "xiii", "xiv", "xv" }; private static final string[] tips = { "hello" , "bitch" , "ass" , "partners" , "screw", "you" ,"all", "peace" , "out"};  private static final int sleep = 1000;  private final int wordbarcolor = r.color.word_bar; private final int numberbarcolor = r.color.number_bar;    public mylistfragment(string tag) {     mtag = tag;     mtotal = helpfragment.tab_about.equals(mtag) ? about.length             : about.length;      log.d(tag, "constructor: tag=" + tag); }  @override public void onactivitycreated(bundle savedinstancestate) {     super.onactivitycreated(savedinstancestate);     // important in order save state across screen     // configuration changes example     setretaininstance(true);      minflater = layoutinflater.from(getactivity());      // need instantiate these first time fragment     // created; then, method above rest     if (madapter == null) {         mitems = new arraylist<string>();         madapter = new myadapter(getactivity(), mitems);     }     getlistview().setadapter(madapter);      // initiate loader background work     getloadermanager().initloader(0, null, this); }  @override public loader<void> oncreateloader(int id, bundle args) {     asynctaskloader<void> loader = new asynctaskloader<void>(getactivity()) {          @override         public void loadinbackground() {             try {                 // simulate time consuming operation going on in                 // background                 thread.sleep(sleep);             } catch (interruptedexception e) {             }             return null;         }     };     // somehow asynctaskloader doesn't want start job without     // calling method     loader.forceload();     return loader; }  @override public void onloadfinished(loader<void> loader, void result) {      // add new item , let adapter know in order refresh     // views     mitems.add(helpfragment.tab_about.equals(mtag) ? about[mposition]             : faq[mposition]);     madapter.notifydatasetchanged();      // advance in list 1 step     mposition++;     if (mposition < mtotal - 1) {         getloadermanager().restartloader(0, null, this);         log.d(tag, "onloadfinished(): loading next...");     } else {         log.d(tag, "onloadfinished(): done loading!");     } }  @override public void onloaderreset(loader<void> loader) { }  private class myadapter extends arrayadapter<string> {      public myadapter(context context, list<string> objects) {         super(context, r.layout.list_item, r.id.text, objects);     }      @override     public view getview(int position, view convertview, viewgroup parent) {         view view = convertview;         wrapper wrapper;          if (view == null) {             view = minflater.inflate(r.layout.list_item, null);             wrapper = new wrapper(view);             view.settag(wrapper);         } else {             wrapper = (wrapper) view.gettag();         }          wrapper.gettextview().settext(getitem(position));         wrapper.getbar().setbackgroundcolor(                 mtag == helpfragment.tab_about ? getresources().getcolor(                         wordbarcolor) : getresources().getcolor(                         numberbarcolor));         return view;     }  }  // use wrapper (or view holder) object limit calling // findviewbyid() method, parses entire structure of // xml in search id of view private class wrapper {     private final view mroot;     private textview mtext;     private view mbar;      public wrapper(view root) {         mroot = root;     }      public textview gettextview() {         if (mtext == null) {             mtext = (textview) mroot.findviewbyid(r.id.text);         }         return mtext;     }      public view getbar() {         if (mbar == null) {             mbar = mroot.findviewbyid(r.id.bar);         }         return mbar;     } } } 

thanks provided u.

so how can make non empty constructor?

generally, don't create non-empty constructor on fragment. instead, use factory pattern, described in comments:

  static editorfragment newinstance(int position) {     editorfragment frag=new editorfragment();     bundle args=new bundle();      args.putint(key_position, position);     frag.setarguments(args);      return(frag);   } 

your fragment can retrieve bundle via getarguments(), , can retrieve whatever data put bundle.