android - FragmentTabHost return null when I get the tag of the tab -


here how create tabhost, tab when user click on tab. problem , return null instead of tag value. 

    tabhost = (fragmenttabhost) findviewbyid(android.r.id.tabhost);     tabhost.setup(this, getsupportfragmentmanager(), r.id.realtabcontent);      tabhost.addtab(             tabhost.newtabspec("home").setindicator("",                     getresources().getdrawable(r.drawable.meun_home)),             homefragment.class, null);     tabhost.addtab(             tabhost.newtabspec("form").setindicator("",                     getresources().getdrawable(r.drawable.meun_register)),             formfragment.class, null);     tabhost.addtab(             tabhost.newtabspec("calculator").setindicator("",                     getresources().getdrawable(r.drawable.meun_calculator)),             calculatorfragment.class, null);     tabhost.addtab(             tabhost.newtabspec("news").setindicator("",                     getresources().getdrawable(r.drawable.meun_call)),             homefragment.class, null);      tabhost.gettabwidget().setdividerdrawable(             getresources().getdrawable(r.drawable.border));      (int = 0; < tabhost.gettabwidget().getchildcount(); i++) {         tabhost.gettabwidget().getchildat(i).setbackgroundcolor(getresources().getcolor(android.r.color.transparent));         layoutparams params = new layoutparams(layoutparams.wrap_content,                 layoutparams.match_parent, 1f);         tabhost.gettabwidget().getchildat(i).setlayoutparams(params);         tabhost.gettabwidget().getchildat(i).setpadding(0, 0, 0, 0);         tabhost.gettabwidget().getchildat(i).setontouchlistener(new ontouchlistener(){             @override             public boolean ontouch(view v, motionevent event) {                 int action = event.getaction();                 if(action == motionevent.action_up) {                                            log.d("test1",""+v.gettag());                     return true; // doesnt allow tab change                 }                 return false;             }                        });     }

you can find line log.d("test1",""+v.gettag()); return null. expected return string "home" , "form", etc..... lot

because not set tag view of newtabspec. set drawable icon not set tag. can in 2 ways:

1) first create imageview drawable icon:

imageview.setimagebitmap(bitmap); imageview.setimageresource(r.drawable.my_image); imageview.setimagedrawable(drawable);

and set tag imageview , use setindicator(view view) add newtabspec.

2) or after add drawable can use getchildtabviewat() view , set tag it.

in summary have not set tag null.

the doc says:

tabhost.tabspec:

a tab has tab indicator, content, , tag used keep track of it. builder helps choose among these options. tab indicator, choices are: 1) set label 2) set label , icon tab content,

so string label, tag , label 2 different things, tag memory of view can store object in object can string or else viewholder design pattern used in creating listview.


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