Functions and usage of the slip-down box of the Android self-study notes

Functions and usage of the slip-down box of the Android self-study notes
Spinner:
Is a type of control similar to the drop-down list. You can select the corresponding option!
The data in the Spinner needs to be filled with an Adapter.

Usage:

 

Layout file activity_main.xml:

Class file MainActivity. java:

 

 

Package com. example. administrator. spinner1; import android. support. v7.app. actionBarActivity; import android. OS. bundle; import android. view. menu; import android. view. menuItem; import android. view. view; import android. widget. adapterView; import android. widget. arrayAdapter; import android. widget. spinner; import android. widget. textView; import java. util. arrayList; import java. util. list; public class MainActivity extends ActionBarActivity {private Spinner spinner; private TextView textView; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); spinner = (Spinner) findViewById (R. id. spinner); textView = (TextView) findViewById (R. id. textView); spinner. setPrompt (select a Three Kingdoms character :); // The following prompt is displayed in the drop-down box: final List list = new ArrayList (); final List list1 = new ArrayList (); final List list2 = new ArrayList (); list. add (Zhao Yun); list. add (Zhuge Liang); list. add (Guan Yu); list. add (LV bu); list1.add (zi Zi Long); list1.add (zi Kong Ming); list1.add (zi yun long); list1.add (zi Feng Xian); list2.add (Force: 90 intelligence: 70 endurance: 80); list2.add (force: 10 intelligence: 100 endurance: 20); list2.add (Force: 95 intelligence: 60 endurance: 80); list2.add (Force: 100 intelligence: 50 endurance: 70); ArrayAdapter adpter = new ArrayAdapter (this, android. r. layout. simple_spinner_item, list); spinner. setAdapter (adpter); spinner. setOnItemSelectedListener (new AdapterView. onItemSelectedListener () {@ Override public void onItemSelected (AdapterView
 Parent, View view, int position, long id) {textView. setText (selected: + list. get (position) +: + list1.get (position); textView. append (personal information: + list2.get (position) ;}@ Override public void onNothingSelected (AdapterView
 Parent ){}});}}