Android's Custom Spinner component implementation method

First, the way the Android API is implemented by default

Edit Main_activity.xml under 1.layout

<relativelayout 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:paddi ngbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_horizontal_margin" Android: paddingright= "@dimen/activity_horizontal_margin" android:paddingtop= "@dimen/activity_vertical_margin" tools: Context= ". Mainactivity "> <spinner android:id=" @+id/spinner01 "android:layout_width=" Match_parent "and roid:layout_height= "Wrap_content" android:entries= "@array/citys"/> <spinner android:id= "@+id/spinn Er02 "android:layout_width=" match_parent "android:layout_height=" Wrap_content "android:layout_below="        @id/spinner01 "/> <spinner android:id=" @+id/spinner03 "android:layout_width=" Match_parent " Android:layout_height= "Wrap_content" android:layout_below= "@id/spinner02"/></relativelayout> 

2.string.xml Code

<?xml version= "1.0" encoding= "Utf-8"?><resources>    <string name= "App_name" >android_015</ string>    <string name= "action_settings" >Settings</string>    <string name= "Hello_world" >hello world!</string>    <string-array name= "Citys" >        <item> Beijing </item>        < item> Shanghai </item>        <item> Guangzhou </item>        <item> shenzhen </item>        <item> Zhuhai < /item>        <item> Huzhou </item>    </string-array>        <string name= "TV" >textview</ String></resources>

3.layout The following custom drop-down options styles Spinner_layout.xml and Me_layout.xml

<?xml version= "1.0" encoding= "Utf-8"? ><textview xmlns:android= "http://schemas.android.com/apk/res/ Android "    android:id=" @android: Id/text1 "    android:layout_width=" match_parent "    android:layout_height= "Wrap_content"    style= "? Android:attr/spinnerdropdownitemstyle"    android:ellipsize= "marquee"    Android: drawableleft= "@drawable/ic_launcher"    android:textcolor= "#00ff00"   />

Me_layout.xml

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/ Android "    android:layout_width=" match_parent "    android:layout_height=" match_parent "    android:o rientation= "Horizontal" >    <textview        android:id= "@+id/textview1" android:layout_width= "Wrap_        Content "        android:layout_height=" wrap_content "        android:drawableleft=" @drawable/ic_launcher "        Android :p addingright= "8dip"        android:paddingtop= "8dip"        android:text= "@string/tv"        android:textsize= "25SP" />    <textview        android:id= "@+id/textview2"        android:layout_width= "Wrap_content"        Android : layout_height= "wrap_content"        android:paddingleft= "8dip"        android:paddingtop= "8dip"        android:text = "@string/tv"        android:textsize= "25SP"/></linearlayout>

4.Java Backend Code

Package Com.example.android_015;import Java.util.arraylist;import Java.util.list;import com.example.android_015. Entity. Person;import android.app.activity;import android.os.bundle;import Android.view.menu;import Android.view.View; Import Android.widget.adapterview;import Android.widget.adapterview.onitemselectedlistener;import Android.widget.arrayadapter;import Android.widget.spinner;import Android.widget.toast;public class MainActivity Extends Activity implements Onitemselectedlistener{private Spinner spinner,spinner03; @Overrideprotected void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); spinner = (spinner) Findviewbyid ( R.ID.SPINNER02); Spinner.setonitemselectedlistener (this);//Gets an array of string.xml resource files string[] Citys = Getresources (). Getstringarray (R.array.citys);//array adapter creation//1. Instantiate the way to create an adapter arrayadapter<string> adapter = new arrayadapter< String> (this,android. R.layout.simple_spinner_item, citys);//2.API recommended way to create AdaptarRayadapter<charsequence> Adapter1 = Arrayadapter.createfromresource (this, R.array.citys, Android. R.layout.simple_spinner_item); Adapter.setdropdownviewresource (r.layout.spinner_layout);//Set the style of the dropdown attempt// Adapter1.setdropdownviewresource (Android. r.layout.simple_list_item_checked); Spinner.setadapter (adapter);//Custom adapter under garbage option SPINNER03 = (spinner) Findviewbyid ( R.ID.SPINNER03);//Establish data source list<person> persons=new arraylist<person> ();p ersons.add (New person ("Zhang San", "Shanghai") ;p Ersons.add ("John Doe", "Shanghai");p Ersons.add (New person ("Harry", "Beijing"));p Ersons.add (New Person ("Zhao Liu", "Guangzhou");//Create AD Apter binding Data Source Myadapter _myadapter=new Myadapter (this, persons);//Binding Adapterspinner03.setadapter (_myadapter);} @Overridepublic boolean Oncreateoptionsmenu (Menu menu) {getmenuinflater (). Inflate (R.menu.main, menu); return true;} The implementation of the selected button @overridepublic void onitemselected (adapterview<?> parent, view view, int Position,long ID) { System.out.println ("Parent:" +parent.getclass ()); Parent Component SpinnerSystem.out.println ("View:" +view.getclass ());     Load drop-down list XML type TEXTVIEWSYSTEM.OUT.PRINTLN ("position=" +position); System.out.println ("id=" +id),//spinner.getselecteditem (). toString () Selected drop-down list value//spinner.getselectedview () is selected The next Garbage Component property//spinner.getselecteditemposition () is selected in the location//spinner.getselecteditemid () of the selected ID String str= Parent.getitematposition (position). ToString (); Toast.maketext (This, "you click to select:" +str, +). Show (); Unselected implementation method @overridepublic void onnothingselected (adapterview<?> parent) {}}

5.Person class

Package com.example.android_015.entity;/** * User Object * @author hbj403 */public class Person {private String Personname;privat E string personaddress;public Person (string personname,string personaddress) {super (); this.personname=personname; this.personaddress=personaddress;} Public String Getpersonname () {return personname;} public void Setpersonname (String personname) {this.personname = PersonName;} Public String getpersonaddress () {return personaddress;} public void setpersonaddress (String personaddress) {this.personaddress = personaddress;}}

6. Custom Myadapter Adapter Class

Package Com.example.android_015;import Java.util.list;import Android.content.context;import Android.view.layoutinflater;import Android.view.view;import Android.view.viewgroup;import Android.widget.baseadapter;import Android.widget.textview;import com.example.android_015.entity.    person;/** * Custom Adapter class * @author hbj403 */public class Myadapter extends Baseadapter {private list<person> mlist;    Private Context Mcontext;    Public Myadapter (Context pcontext,list<person> pList) {this.mcontext=pcontext;    This.mlist=plist;} @Overridepublic int GetCount () {return mlist.size ();} @Overridepublic Object getItem (int position) {return mlist.get (position);} @Overridepublic long Getitemid (int position) {return position;} Main Code @overridepublic view GetView (int position, view Convertview, ViewGroup parent) {Layoutinflater _layoutinflater= Layoutinflater.from (Mcontext); Convertview=_layoutinflater.inflate (r.layout.me_layout, NULL); if (convertView!= NULL) {TextView _textview1= (TextView) conveRtview.findviewbyid (R.ID.TEXTVIEW1); TextView _textview2= (TextView) Convertview.findviewbyid (R.ID.TEXTVIEW2); _textview1.settext (Mlist.get (position). Getpersonname ()); _textview2.settext (Mlist.get (position). Getpersonaddress ());} return Convertview;}}

Second, operation mode

The listener event is the same as the first method:

Some linked documents from: http://blog.csdn.net/jiangqq781931404/article/details/7285623

Android's Custom Spinner component implementation method