I tried to set spinner with drop down arrow but i couldn't fix it can anyone help me with this? I have attached the source code.
my class file:
    import android.os.Bundle;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.Spinner;
    import android.widget.AdapterView.OnItemSelectedListener;
    import android.widget.Toast;
        public class topup extends Activity  {
            Spinner spinner,spin1,spin2,spin3;
                EditText ed,ed1;
                Button btn;
                List<String> list, list1,list2,list3;
                    private String[] countries_list={"01","02","03","04","05","06","07","08","09","10","11","12"};
                    protected void onCreate(Bundle savedInstanceState) {
                        super.onCreate(savedInstanceState);
                        setContentView(R.layout.topup);
                        spinner = (Spinner) findViewById(R.id.spinner1);
                        spin1= (Spinner) findViewById(R.id.spinner2);
                        spin2= (Spinner) findViewById(R.id.spinner3);
                        spin3= (Spinner) findViewById(R.id.spinner4);
                        ed = (EditText) findViewById(R.id.editText3);
                        list = new ArrayList<String>();
                        list.add("");
                        list.add("select");
                        list.add("01");
                        list.add("02");
                        list.add("03");
                        list.add("04");
                        list.add("05");
                        list.add("06");
                        list.add("07");
                        list.add("08");
                        list.add("09");
                        list.add("10");
                        list.add("11");
                        list.add("12");
                        ArrayAdapter<String> adp = new ArrayAdapter<String>
                            (this, android.R.layout.simple_spinner_item, list);
                        //adp.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        spinner.setAdapter(adp);
                        spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
                            //@Override
                            public void onItemSelected(AdapterView<?> parent, View arg1,int arg2, long arg3) {
                                // TODO Auto-generated method stub
                                 String item = spinner.getItemAtPosition(1).toString();
                                 //Toast.makeText(spinner.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();
                                 String ss=spinner.getSelectedItem().toString();
                                 String 
                            }
                            public void onNothingSelected(AdapterView<?> arg0) {
                                // TODO Auto-generated method stub
                            }
                        });
my xml file:
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/back1"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="wrap_content"
        android:layout_height="55dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="20dp" 
        android:background="@drawable/red">
        <Spinner
            android:id="@+id/spinner1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:dropDownWidth="fill_parent" 
         />
    </LinearLayout>
    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="55dp"
        android:layout_alignLeft="@+id/linearLayout1"
        android:layout_alignRight="@+id/linearLayout1"
        android:layout_below="@+id/linearLayout1"
        android:layout_marginTop="25dp"
        android:background="@drawable/red"
        android:ems="10"
        android:hint="enter card number" >
        <requestFocus />
    </EditText>
    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="wrap_content"
        android:layout_height="55dp"
        android:layout_alignLeft="@+id/editText1"
        android:layout_alignRight="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="33dp"
        android:orientation="horizontal" 
        android:background="@drawable/red">
        <Spinner
            android:id="@+id/spinner3"
            android:layout_width="72dp"
            android:layout_height="wrap_content"
             />
        <Spinner
            android:id="@+id/spinner2"
            android:layout_width="72dp"
            android:layout_height="wrap_content" 
            />
        <EditText
            android:id="@+id/editText2"
            android:layout_width="22dp"
            android:layout_height="match_parent"
            android:layout_weight="0.18"
            android:ems="10"
            android:hint="enter cvv" />
    </LinearLayout>
    <LinearLayout
        android:id="@+id/linearLayout3"
        android:layout_width="wrap_content"
        android:layout_height="55dp"
        android:layout_alignParentLeft="true"
        android:layout_alignRight="@+id/linearLayout2"
        android:layout_below="@+id/linearLayout2"
        android:layout_marginTop="26dp"
        android:orientation="vertical"
        android:background="@drawable/red" >
    </LinearLayout>
    <Spinner
        android:id="@+id/spinner4"
        android:layout_width="15dp"
        android:layout_height="18dp"
        android:layout_alignBottom="@+id/linearLayout3"
        android:layout_alignLeft="@+id/linearLayout3"
        android:layout_alignRight="@+id/linearLayout3"
        android:layout_alignTop="@+id/linearLayout3"
      />
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/linearLayout3"
        android:layout_marginTop="18dp"
        android:text="Add Amount" 
        android:background="@drawable/buttonsty"/>
</RelativeLayout>
 
     
     
     
    
 
     
     
    
 
     
     
     
     
     
     
     
     
    