android - make a single button width to fill parent programmatically -

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how make single button width fill parent programmatically? have done cannot seem work still located on top left width wrapping content... here of code on button creation...

public class test_gifdisplay extends activity implements view.onclicklistener {      surfaceview sview;     gifrun gr = new gifrun();     button btnback;      protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         sview = new surfaceview(this);         sview.setzorderontop(true);          gr.loadgiff(sview, this, r.drawable.smiley);          linearlayout linearlayout1 = new linearlayout(this);         linearlayout1.setorientation(linearlayout.vertical);         linearlayout1.setbackgroundcolor(color.parsecolor("#27ae60"));         linearlayout1.setlayoutparams(new viewgroup.layoutparams(                 viewgroup.layoutparams.wrap_content,                 viewgroup.layoutparams.wrap_content));          linearlayout linearlayout2 = new linearlayout(this);         linearlayout2.setorientation(linearlayout.vertical);         linearlayout2.setbackgroundcolor(color.parsecolor("#27ae60"));         linearlayout2.setlayoutparams(new viewgroup.layoutparams(                 viewgroup.layoutparams.wrap_content,                 viewgroup.layoutparams.wrap_content));          linearlayout.layoutparams p = new            linearlayout.layoutparams(linearlayout.layoutparams.fill_parent,            linearlayout.layoutparams.wrap_content);         p.weight = 1.0f;          btnback = new button (this);         btnback.settext("back");         btnback.setbackgroundcolor(color.parsecolor("#f1c40f"));         btnback.setgravity(gravity.center_horizontal);         btnback.setlayoutparams(p);         btnback.setonclicklistener(this);          linearlayout2.addview(btnback);         linearlayout1.addview(linearlayout2);         linearlayout1.addview(sview);          setcontentview(linearlayout1);     }      @override     public void onclick(view view) {         btnback = (button) view;         btnback.setbackgroundcolor(color.parsecolor("#2980b9")); //color change         new countdowntimer(100, 50) {              @override             public void ontick(long arg0) {                 // todo auto-generated method stub             }              @override             public void onfinish() {                 btnback.setbackgroundcolor(color.parsecolor("#f1c40f")); // original color             }         }.start();//end color changed          finish();     } }

you adding button linearlayout2. should change linearlayout2's width match_parent

linearlayout2.setlayoutparams(new viewgroup.layoutparams(         viewgroup.layoutparams.match_parent,         viewgroup.layoutparams.wrap_content));

i hope helps.

p.s: can create button's selectors pressed , selected states, instead of using timer show pressed button effect. here basic link can in achieving : android button selector


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