Android--spinner control to read XML resources, provincial and municipal level two interaction

(1) First create a provincial and municipal Arrays.xml folder in the values below the Res folder, as follows

<?XML version= "1.0" encoding= "Utf-8"?><Resources><String-arrayname= "Province">  　　　  <Item>Provinces</Item> <Item>Hebei Province</Item> <Item>Shanxi Province</Item> 　　  <Item>Beijing</Item> </String-array> <String-arrayname= "HB">  　　　  <Item>City</Item> <Item>Chengde</Item> <Item>Handan</Item> 　　  <Item>Langfang city</Item> </String-array> <String-arrayname= "BJ">  　　　　  <Item>City</Item> <Item>Haidian district</Item> <Item>Chaoyang</Item> 　　  <Item>Chongwen district</Item> </String-array> <String-arrayname= "Shx">  　　  <Item>City</Item> <Item>Datong city</Item> <Item>Linfen city</Item> </String-array> </Resources>

(2) then add two spinner controls to the layout file, and the XML layout code is as follows

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:id= "@+id/linearlayout1"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical"Android:paddingbottom= "@dimen/activity_vertical_margin"Android:paddingleft= "@dimen/activity_horizontal_margin"Android:paddingright= "@dimen/activity_horizontal_margin"Android:paddingtop= "@dimen/activity_vertical_margin"Tools:context= "Com.example.spinner.MainActivity" >    <SpinnerAndroid:id= "@+id/sppro"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content" />    <SpinnerAndroid:id= "@+id/spcity"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content" /></LinearLayout>

(3) Here the resources and layout interface has been set up, the next is in the Mainactivity with code to control the linkage between the provinces and cities, in the comments in the code, the code is as follows

public class Mainactivity extends Activity {private Spinner sppro, spcity; @Overrideprotected void OnCreate (Bundle Savedin Stancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); SpPro = (Spinner) Findviewbyid (r.id.sppro); spcity = (Spinner) Findviewbyid (r.id.spcity);//Set Data source arrayadapter<charsequence> adapter = Arrayadapter.createfromresource (this, r.array.province,android. R.layout.simple_spinner_item);//Set the dropdown list style Adapter.setdropdownviewresource (Android. R.layout.simple_spinner_dropdown_item);//Bind the data source to the spinner control Sppro.setadapter (adapter);// Spinner Option Select Event Sppro.setonitemselectedlistener (new Onitemselectedlistener () {@Overridepublic void onitemselected ( Adapterview<?> Parent, view view, int position, long ID) {//the parent here refers to the Sppro drop-down box spinner spinner = (spinner) parent; Use the Getitematposition (position) method to find the name of the province item String Pro = (string) spinner.getitematposition (position);// Set the city-level data adapter arrayadapter<charsequence> Cityadapter = Arrayadapter.createfromresourCE (Mainactivity.this, r.array.bj,android. R.layout.simple_spinner_item);//judgment, then set the adapter if (Pro.equals ("Hebei province")) {Cityadapter = Arrayadapter.createfromresource ( Mainactivity.this, R.array.hb,android. R.layout.simple_spinner_item);} else if (pro.equals ("Beijing")) {Cityadapter = Arrayadapter.createfromresource (Mainactivity.this, r.array.bj,android. R.layout.simple_spinner_item);} else if (pro.equals ("Shanxi Province")) {Cityadapter = Arrayadapter.createfromresource (Mainactivity.this, r.array.shx,android. R.layout.simple_spinner_item);} Spcity.setadapter (Cityadapter);} @Overridepublic void onnothingselected (adapterview<?> parent) {}});}}

The effect of the last run is as shown

Android--spinner control to read XML resources, provincial and municipal level two interaction