Simple Spinner

step1:
spinner_style.xml

<?xml version="1.0" encoding="utf-8"?>
<shape

xmlns:android="http://schemas.android.com/apk/res/android"    

xmlns:app="http://schemas.android.com/apk/res-auto">

    <stroke        

android:width="1dp"        

android:color="@color/colorBlue" />
    <corners 

android:bottomRightRadius="5dip" 

android:bottomLeftRadius="5dip"        

android:topLeftRadius="5dip" 

android:topRightRadius="5dip"        />

</shape>

step2:

<Spinner    
android:id="@+id/spinner"    
android:layout_weight="1"
android:background="@drawable/spinner_style"    
android:layout_width="match_parent"    
android:layout_height="match_parent"    
android:drawableRight="@android:drawable/arrow_down_float"    />
step3:
public class SpinnerActivity extends AppCompatActivity {
String spinner_items[]={
        "New illness",
        "New illness",
        "New illness",
        "New illness",
        "New illness"};
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner);
        Spinner spinner=(Spinner)findViewById(R.id.spinner);
 ArrayAdapter<String> adapter2=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,spinner_items);       
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);      
spinner.setAdapter(adapter2);