Android Control---Spinner

The list items for the Spinner drop-down list box are configured in two ways:

1. Through the resource file configuration, the list item content is added by using the <string-array> element in the XML of the values, such as Strings.xml, and then through the android:entries= "@array/xxid" The way to link.

2. Read the resource file through the Android.widget.ArrayAdapter class or specify the specific settings data.

One: How the resource files are configured.

<?XML version= "1.0" encoding= "Utf-8"?><Resources>    <stringname= "App_name">ADTest</string>    <stringname= "Hello_world">Hello world!</string>    <stringname= "Action_settings">Settings</string>        <String-arrayname= "Mycity">        <Item>Beijing</Item>        <Item>Chongqing</Item>        <Item>Shanghai</Item>    </String-array></Resources>

Configure the link through the android:entries= "@array/mycity" of the spinner species.

Two. Configure through the Arrayadapter class.

(1) Read the list items defined in the resource file

arrayadapter<charsequence> adapter = Arrayadapter.createfromresource (This, r.array.mycity, Android.　R.layout.simple_spinner_item);  Adapter.setdropdownviewresource (Android. R.layout.simple_spinner_dropdown_item);   Spinner.setadapter (adapter);

(2) Read the development data

arraylist<charsequence> list =NewArraylist<charsequence>(); List.add (Beijing); List.add (Chongqing); List.add (Shanghai); List.add (Tianjin); Spinner Spinner=(Spinner) Findviewbyid (r.id.spinner1); Arrayadapter<CharSequence> adapter =NewArrayadapter<charsequence> ( ThisAndroid.        R.layout.simple_spinner_dropdown_item, list); Adapter.setdropdownviewresource (Android.        R.layout.simple_spinner_item); Spinner.setadapter (adapter);

Or

string[] items = {"Beijing", "Shanghai", "Chongqing", "Tianjin"};
Spinner Spinner = (Spinner) Findviewbyid (r.id.spinner1);

arrayadapter<charsequence> adapter = New Arrayadapter<charsequence> (this, Android. R.layout.simple_spinner_dropdown_item, items);

Adapter.setdropdownviewresource (Android. R.layout.simple_spinner_item);

Spinner.setadapter (adapter);

        

Where the charsequence is the parent class interface of String,

Arrayadapter<charsequence> adapter = new arrayadapter<charsequence> ( Span style= "color: #0000ff;" >this, Android. R.layout.simple_spinner_dropdown_item, items) in Android. R.layout.simple_spinner_dropdown_item is the style when the list box is not expanded, while Adapter.setdropdownviewresource (Android. R.layout.simple_spinner_item) is the style of the drop-down list after the settings are expanded.