Android to implement Pull-down menu spinner effect _android

Android drop-down menu, such as <select> in HTML, the key is to call the Setdropdownviewresource method, in XML to define the appearance of the Drop-down menu to display

1.1.activity_main.xml

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout 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:orientation= "vertical" tools:context= "com.rj141.sb.kongjian.MainActivity" > <linea Rlayout android:orientation= "Horizontal" android:layout_width= match_parent "android:layout_height=" Wrap_co 
      Ntent "> <textview android:layout_width=" wrap_content "android:layout_height=" Wrap_content " Android:textsize= "18DP" android:text= "Please choose your favorite fruit:"/> <spinner android:layout_width= "Match_par Ent "android:layout_height=" wrap_content "android:id=" @+id/spinner "/> </LinearLayout> &l T 
    TextView android:layout_width= "wrap_content" android:layout_height= "wrap_content" android:textsize= "18DP" Android:id= "@+id/tv"/> 
 
</LinearLayout>  

Spinner is the component of the Drop-down list

1.2.mainactivity.class

public class Mainactivity extends Appcompatactivity {private Spinner s; 
  String[] data=new string[]{"Apple", "Sydney", "watermelon", "Grape", "orange", "Strawberry"}; 
 
  Private TextView TV; 
    @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
 
    Setcontentview (R.layout.activity_main); 
    tv= (TextView) This.findviewbyid (r.id.tv); 
    S= (Spinner) This.findviewbyid (R.id.spinner); S.setadapter (New arrayadapter<string> (this,android). 
    R.layout.simple_list_item_1,data)); S.setonitemselectedlistener (New Adapterview.onitemselectedlistener () {@Override public void onitemselected ( 
        Adapterview<?> Parent, view view, int position, long id) {String str=data[position]; 
      Tv.settext ("Favorite fruit is:" +str); 
  @Override public void onnothingselected (adapterview<?> parent) {}}); } s.setadapter (New Arrayadapter<string> (this,android). R.layout.simple_list_item_1,data));Ndroid. R.layout.simple_list_item_1 refers to Android's own Drop-down list format, where data is the source; S.setonitemselectedlistener (new Adapterview.onitemselectedlistener ()) {..} ; Is the monitor of the dropdown list

Effect Chart:

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