Drop-down list in Android

Tag: Use code to get the tag wrap com logs opd util

In web development, HTML provides a drop-down list implementation that uses the <select> element to implement a drop-down list in which each drop-down list item uses the <option> representation. This is an essential interactive component in web development, and the corresponding implementation in Android is spinner.

Method One:

Static display of Spinner options in resource mode:

<spinner     android:layout_width= "match_parent"    android:layout_height= "wrap_content"    android:id= "@ +id/spinner2 "    android:entries=" @array/spingarr "    />

Data files:

<?xml version= "1.0" encoding= "Utf-8"?><resources> <string-array    name= "Spingarr" >     < Item> Beijing </item>      <item> Shanghai </item>      <item> Guangzhou </item>      <item> Shenzhen < /item>      </string-array></resources>

Usage 2:

Dynamically display the Spinner option in code mode to add data to Spinner with the adapter

Package Com.example.testspanner;import Java.util.arraylist;import Java.util.list;import android.app.Activity; Import Android.os.bundle;import Android.widget.arrayadapter;import Android.widget.spinner;public class MainActivity Extends Activity {private Spinner spinner;private list<string> data_list;private arrayadapter<string> arr_    Adapter        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.spinner);            Spinner = (spinner) Findviewbyid (R.id.spinner);        Data Data_list = new arraylist<string> ();        Data_list.add ("Beijing");        Data_list.add ("Shanghai");        Data_list.add ("Guangzhou");                Data_list.add ("Shenzhen"); Adapter arr_adapter= New Arrayadapter<string> (this, Android.        R.layout.simple_spinner_item, data_list); Set style Arr_adapter.setdropdownviewresource (Android.        R.layout.simple_spinner_dropdown_item); Load Adapter Spinner. Setadapter (Arr_adapter); 
Get value

Spinner.setonitemselectedlistener (New Onitemselectedlistener () {

@Override
public void onitemselected (adapterview<?> arg0, View arg1,
int arg2, long arg3) {
LOG.I ("Sssssssss", Data_list.get (arg2));

}

@Override
public void onnothingselected (adapterview<?> arg0) {
TODO auto-generated Method Stub

}
});

            }}

Layout file added:

<spinner     android:layout_width= "match_parent"    android:layout_height= "wrap_content"    android:id= "@ +id/spinner "    />

Category: Android

Drop-down list in Android