java - Number picker doesn't show properly as designer -

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i have issues number picker control in android studio. control aren't displayed on real device when run application. number picker has no gray background color, no "+" / "-" buttons displayed, transparent ?

android studio designer xml

     <?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="#000000"     >      <expandablelistview         android:layout_width="wrap_content"         android:layout_height="342dp"         android:id="@+id/lvtranexp"         android:layout_alignparentleft="true"         android:layout_alignparentstart="true"          android:layout_above="@+id/numberpicker"         android:layout_alignparenttop="true" />      <linearlayout         android:orientation="horizontal"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_alignparentbottom="true"         android:layout_below="@+id/lvtranexp"         android:layout_alignparentleft="true"         android:layout_alignparentstart="true"         android:layout_alignparentright="true"         android:layout_alignparentend="true">          <numberpicker             android:scalex="0.5"             android:scaley="0.5"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/numberpickerstartday"             android:layout_below="@+id/lvtranexp"             android:layout_toleftof="@+id/numberpickerstartday"             android:layout_tostartof="@+id/numberpickerstartday"             android:solidcolor="#da9c9c" />          <numberpicker             android:scalex="0.5"             android:scaley="0.5"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/numberpickerstartmonth"             android:layout_below="@+id/lvtranexp"             android:layout_torightof="@+id/numberpickerstartday"             android:layout_toendof="@+id/numberpickerstartday"             android:solidcolor="#895353" />          <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:textappearance="?android:attr/textappearancesmall"             android:text="start date"              android:textcolor="#e9e97619"             android:id="@+id/textview5"             android:layout_below="@+id/lvtranexp"        android:layout_alignbottom="@+id/numberpicker1"             android:layout_marginleft="40dp"              android:layout_gravity="center" />     </linearlayout>   </relativelayout>

and java code number picker:

 view contentview = inflater.inflate(r.layout.activity_transactions, null);     numberpicker startday = (numberpicker)contentview.findviewbyid(r.id.numberpickerstartday);     numberpicker startmonth = (numberpicker)contentview.findviewbyid(r.id.numberpickerstartmonth);     string []days = new string[31];     for(int =0;i<days.length;i++){         days[i]=integer.tostring(i+1);     }     string []months = new string[12];     for(int =0;i<months.length;i++){         months[i]=integer.tostring(i+1);     }     startday.setminvalue(1);     startday.setmaxvalue(31);     startday.setwrapselectorwheel(false);     startday.setdisplayedvalues(days);     startday.setvalue(1);      startmonth.setminvalue(1);     startmonth.setmaxvalue(12);     startmonth.setwrapselectorwheel(false);     startmonth.setdisplayedvalues(months);     startmonth.setvalue(1);

this device screenshot: enter image description here

thanks in advance


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