Android: Custom Adapter

Both Arrayadapter and simpleadapter inherit the Baseadapter, and the custom adapter also inherits Baseadapter

Example: Gallery Implementing a picture browser

<? XML version= "1.0" encoding= "Utf-8" ?> < Gallery   xmlns:android = "Http://schemas.android.com/apk/res/android"     android:id= "@+id/gallery"    android:layout_width= "Match_parent"      android:layout_height= "wrap_content">    </ Gallery >

 Public classMainactivityextendsActivity {PrivateGallery Gallery;Private int[] res={r.drawable.ic_launcher,r.drawable.ic_launcher};PrivateImageadapter Adapter; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.demo); Gallery=(Gallery) Findviewbyid (r.id.gallery); Adapter=NewImageadapter (Res, This);                            Gallery.setadapter (adapter); }}

Custom Adapters

 Public classImageadapterextendsbaseadapter{ Public intres[]; Privatecontext Context;  PublicImageadapter (intRes[],context Context) {         This. res=Res;  This. context=context; } @Override//returns the total number of defined data sources     Public intGetCount () {//TODO auto-generated Method Stub        returnres.length; } @Override//tells the adapter to get the data object in the current container     PublicObject GetItem (intposition) {        //TODO auto-generated Method Stub        returnposition; } @Override//tells the adapter to get the data ID in the current container     Public LongGetitemid (intposition) {        //TODO auto-generated Method Stub        returnposition; } @Override//Get the image view you want to display now     PublicView GetView (intposition, View Convertview, ViewGroup parent) {        //TODO auto-generated Method StubImageView image=NewImageView (context);        Image.setbackgroundresource (Res[position]); Image.setlayoutparams (NewGallery.layoutparams (400,300));        Image.setscaletype (SCALETYPE.FIT_XY); returnimage; }}