Go Spinner drop-down list in Android (implemented with Arrayadapter and custom adapter)

Today I learned the spinner component, using spinner as the equivalent of selecting a project from the drop-down list, the following shows the use of spinner (using Arrayadapter and custom adapter implementations respectively)

(a): Use Arrayadapter to fit data:

①: First define a layout file:

1 <spanstyle= "FONT-SIZE:16PX;"><?XML version= "1.0" encoding= "Utf-8"?>2 <LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"3 Android:layout_width= "Fill_parent"4 Android:layout_height= "Fill_parent"5 android:orientation= "vertical" >6  7     <Spinner8         Android:id= "@+id/spinner1"9 Android:layout_width= "Match_parent"Ten Android:layout_height= "Wrap_content" One       /> A </LinearLayout></span>

"Note:" The above spinner has two properties 1:prompt is the initial time, spinner displays the data, is a reference type 2:entries is to bind the data source directly in the XML layout file (can not be set, that can be dynamically bound in the activity)

②: Create a data source, use an array, and the data will be displayed in the spinner down list:

1 <spanstyle= "FONT-SIZE:16PX;"><?XML version= "1.0" encoding= "Utf-8"?>2 <Resources>3     <String-arrayname= "Spinnername">4         <Item>Beijing</Item>5         <Item>Shanghai</Item>6         <Item>Guangzhou</Item>7         <Item>Shenzhen</Item>8     </String-array>9 </Resources></span>

③: Then add the following code to the activity ( using a system-defined drop-down list of layout files, of course, can also be customized)

       // Initialize control mspinner = (Spinner) Findviewbyid (r.id.spinner1); // set up a data source string[] Mitems = getresources (). Getstringarray (r.array.spinnername); // establish adapter and bind the data source arrayadapter<string> _adapter=New arrayadapter<string> (this, Android. R.layout.simple_spinner_item, mitems); // bind Adapter to control mspinner.setadapter (_adapter);

The above code initially completed, to see the effect of the operation:

Here is a click event about spinner (for example):

Mspinner.setonitemselectedlistener (NewOnitemselectedlistener () {@Override Public voidOnitemselected (adapterview<?>Parent, view view,intPositionLongID) {String str=parent.getitematposition (position). ToString (); Toast.maketext (spinneractivity. This, "You clicked:" +str, 2000). Show (); } @Override Public voidOnnothingselected (adapterview<?>parent) {        //TODO auto-generated Method Stub    }});

(ii) Use of custom adapter (emphasis)

①: Define a layout file for each item

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "Horizontal" >     <TextViewAndroid:id= "@+id/textview1"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:drawableleft= "@drawable/ic_launcher"Android:paddingright= "8dip"Android:paddingtop= "8dip"Android:text= "TextView"android:textsize= "25SP" />     <TextViewAndroid:id= "@+id/textview2"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:paddingleft= "8dip"Android:paddingtop= "8dip"Android:text= "TextView"android:textsize= "25SP" /> </LinearLayout>

②: Establish the Person class:

1  Packagecom.jiangqq.csdn;2  Public classPerson {3     PrivateString personname;4     PrivateString personaddress;5      PublicPerson (String personname, String personaddress) {6         Super();7          This. PersonName =PersonName;8          This. personaddress =personaddress;9     }Ten      PublicString Getpersonname () { One         returnPersonName; A     } -      Public voidsetpersonname (String personname) { -          This. PersonName =PersonName; the     } -      PublicString getpersonaddress () { -         returnpersonaddress; -     } +      Public voidsetpersonaddress (String personaddress) { -          This. personaddress =personaddress; +     } A   at}

③: Create Myadapter inheritance and baseadapter to fit:

 Packagecom.jiangqq.csdn;Importjava.util.List;ImportAndroid.content.Context;ImportAndroid.view.LayoutInflater;ImportAndroid.view.View;ImportAndroid.view.ViewGroup;ImportAndroid.widget.BaseAdapter;ImportAndroid.widget.TextView;/*** Custom Adapter class *@authorjiangqq <a href=http://blog.csdn.net/jiangqq781931404></a> **/ Public classMyadapterextendsBaseadapter {PrivateList<person>mlist; PrivateContext Mcontext;  PublicMyadapter (Context PContext, list<person>pList) {         This. Mcontext =PContext;  This. mlist =pList; } @Override Public intGetCount () {returnmlist.size (); } @Override PublicObject GetItem (intposition) {        returnMlist.get (position); } @Override Public LongGetitemid (intposition) {        returnposition; }    /*** Below is the important code*/@Override PublicView GetView (intposition, View Convertview, ViewGroup parent) {Layoutinflater _layoutinflater=Layoutinflater.from (Mcontext); Convertview=_layoutinflater.inflate (R.layout.item,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 ()); }        returnConvertview; }}

④: Add the following code to the activity:

       //Initializing the controlMspinner =(Spinner) Findviewbyid (r.id.spinner1);//set up a data sourceList<person> persons=NewArraylist<person>();p Ersons.add (NewPerson ("Zhang San", "Shanghai"));p Ersons.add (NewPerson ("John Doe", "Shanghai"));p Ersons.add (NewPerson ("Harry", "Beijing"));p Ersons.add (NewPerson ("Zhao Liu", "Guangzhou"));//To establish a adapter bound data sourceMyadapter _myadapter=NewMyadapter ( This, persons);//Binding AdapterMspinner.setadapter (_myadapter);

The results are as follows:

The Listener event is the same as the first method:

Transferred from: http://blog.csdn.net/jiangqq781931404/article/details/7285623

Go Spinner drop-down list in Android (implemented with Arrayadapter and custom adapter)