android - cannot create editTexts at runtime -


i want add 3 edittext adjacent each other when user gives focus view. want when user taps first edittext, new set of 3 edittexts created below existing ones.

this code returning error(nullpointerexception) 

 @override public void onfocuschange(view v, boolean hasfocus) {     // todo auto-generated method stub     switch(v.getid()){      // 5 id of view     case 5:          main=new relativelayout(this);         mainparams=new relativelayout.layoutparams(layoutparams.wrap_content, layoutparams.wrap_content );         main.setlayoutparams(mainparams);          //mainlayout linearlayout           items[no]=new edittext(this);         rates[no]=new edittext(this);         quants[no]=new edittext(this);          items[no].sethint("enter item name");         rates[no].sethint("rate");         quants[no].sethint("quantity");          items[no].setid(id++);         rates[no].setid(id++);         quants[no].setid(id++);          relativelayout.layoutparams etparams=new relativelayout.layoutparams(layoutparams.wrap_content, layoutparams.wrap_content);         relativelayout.layoutparams rparams=new relativelayout.layoutparams(layoutparams.wrap_content, layoutparams.wrap_content);           etparams.addrule(relativelayout.align_parent_left);         rparams.addrule(relativelayout.align_right);           items[no].setlayoutparams(etparams);         rates[no].setlayoutparams(rparams);         quants[no].setlayoutparams(rparams);         mainlayout.addview(main);         no++;      }

try this,

// 5 id of view     case 5:          main=new relativelayout(this);         mainparams=new relativelayout.layoutparams(layoutparams.wrap_content, layoutparams.wrap_content );         main.setlayoutparams(mainparams);          //mainlayout linearlayout           items[no]=new edittext(this);         rates[no]=new edittext(this);         quants[no]=new edittext(this);            relativelayout.layoutparams etparams=new relativelayout.layoutparams(layoutparams.wrap_content, layoutparams.wrap_content);         relativelayout.layoutparams rparams=new relativelayout.layoutparams(layoutparams.wrap_content, layoutparams.wrap_content);           etparams.addrule(relativelayout.align_parent_left);         rparams.addrule(relativelayout.align_right);           items[no].setlayoutparams(etparams);         rates[no].setlayoutparams(rparams);         quants[no].setlayoutparams(rparams);         mainlayout.addview(main);   items[no].sethint("enter item name");         rates[no].sethint("rate");         quants[no].sethint("quantity");          items[no].setid(id++);         rates[no].setid(id++);         quants[no].setid(id++);         no++;      }

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