TextView & Button Not Showing After Add DatePicker In Android -

i new in android. have app picks user date of birth using datepicker . when add feature xml elements textview & button not showing. how's possible? may know correct way achieve objective? maybe question basic, did't find suitable solution.please me out

here code :

public class userdobactivity extends activity {  datepicker datepickerbirthday; textview textviewuserdate;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_user_dob);        actionbar ab = getactionbar();      ab.setdisplayuselogoenabled(false);     ab.setdisplayshowhomeenabled(true);     ab.setdisplayoptions(actionbar.display_show_custom);      ab.setcustomview(r.layout.actionbar);     ab.setdisplayhomeasupenabled(true);     colordrawable colordrawable = new colordrawable(color.parsecolor("#33ccff"));          ab.setbackgrounddrawable(colordrawable);   // create date picker     datepickerbirthday = new datepicker(this);      // hide whole calendar view (works in api 11 or greater)     int currentapiversion = android.os.build.version.sdk_int;     if (currentapiversion >= 11) {         datepickerbirthday.setcalendarviewshown(false);     }  // create textview     textviewuserdate = new textview(this);     textviewuserdate.setgravity(gravity.center);      // initialize date current date     simpledateformat sdfdatetime = new simpledateformat("yyyy-mm-dd", locale.us);     string datestr = sdfdatetime.format(new date(system.currenttimemillis()));      string[] datesplit = datestr.split("-");     int currentyear = integer.parseint(datesplit[0]);     int currentmonth = integer.parseint(datesplit[1]);     int currentday = integer.parseint(datesplit[2]);      // show date , day of week in textview     sethumanreadabledate(currentyear, currentmonth, currentday);      // initialize date picker listener     // currentmonth - 1, because on picker, 0 january     datepickerbirthday.init(currentyear, currentmonth - 1, currentday, birthdaylistener);      // add container     linearlayout linearlayoutcaltvcontainer = new linearlayout(this);     linearlayoutcaltvcontainer.setorientation(linearlayout.vertical);     linearlayoutcaltvcontainer.addview(datepickerbirthday);     linearlayoutcaltvcontainer.addview(textviewuserdate);   // set views activity     setcontentview(linearlayoutcaltvcontainer);      relativelayout layoutcaltvcontainer = (relativelayout) findviewbyid(r.id.layout);     layoutcaltvcontainer.addview(datepickerbirthday); }  // date picker listener ondatechangedlistener birthdaylistener = new ondatechangedlistener() {      public void ondatechanged(datepicker birthdaydatepicker,             int newyear, int newmonth, int newday) {          try{              // currentmonth + 1, retrieve proper month             sethumanreadabledate(newyear, newmonth + 1, newday);          } catch (nullpointerexception e) {             e.printstacktrace();         } catch (exception e) {             e.printstacktrace();         }     } };  // show user better date format @suppresslint("simpledateformat") public void sethumanreadabledate(int newyear, int newmonth, int newday){     try {          string clickeddate = newyear + "-" + newmonth + "-" + newday;         simpledateformat sdf = new simpledateformat("yyyy-mm-dd");         date d = null;         try {             d = sdf.parse(clickeddate);         } catch (java.text.parseexception e) {             // todo auto-generated catch block             e.printstacktrace();         }          simpledateformat sdfdatetime = new simpledateformat("mmmm dd, yyyy 'is' eeee", locale.us);         string datestr = sdfdatetime.format(d);          textviewuserdate.settext(datestr);      } catch (parseexception e) {         e.printstacktrace();     } }    @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.user_dob, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     switch (item.getitemid()) {         case android.r.id.home:             // app icon in action bar clicked; go home             intent intent = new intent(this, userdetailsactivity.class);             intent.addflags(intent.flag_activity_clear_top);             startactivity(intent);             return true;             default:             return super.onoptionsitemselected(item);     } }  @override public void onbackpressed() {    movetasktoback(true);     userdobactivity.this.finish(); }} 

here xml :

    <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical"     android:background="@android:color/white">     <textview         android:id="@+id/text_id"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center"         android:text="@string/dobdetails"         android:textsize="30sp"         android:layout_margintop="50dp"          android:gravity="center_horizontal" />    <relativelayout     android:id="@+id/layout"     android:layout_width="fill_parent"     android:layout_height="0dip"     android:layout_weight="1" >    </relativelayout>      <button      android:id="@+id/buttonuserdob"       android:layout_width="match_parent"      android:layout_height="60dp"      android:text="@string/next"      android:background="@drawable/customised_button_click"      android:textsize="20sp"        />   </linearlayout> 

you calling setcontentview(linearlayoutcaltvcontainer); again after setting layout r.layout.activity_user_dob content view. override set layout , contained in layout disappear. why don't create complete layout solely in xml? try this:

put datepicker , textview layout wherever want them be:

<datepicker         android:id="@+id/datepicker"         android:layout_width="wrap_content"         android:layout_height="wrap_content" />  <textview          android:id="@+id/textviewuserdate"         android:layout_width="wrap_content"         android:layout_height="wrap_content"/> 

and after setting layout setcontentview(r.layout.activity_user_dob); can retrieve instances of datepicker , textview this:

@override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_user_dob);      // instances of datepicker , textview layout     datepicker datepickerbirthday = findviewbyid(r.id.datepicker);     textview textviewuserdate = findviewbyid(r.id.textviewuserdate);      // continue rest of setup     int currentapiversion = android.os.build.version.sdk_int;     if (currentapiversion >= 11) {         datepickerbirthday.setcalendarviewshown(false);     }     ... } 

but sure never again call setcontentview(...); after set layout r.layout.activity_user_dob.