Android basics: imageswitcher and gallery

Android basics: imageswitcher and gallery

16:16:15

When creating an image browser, imageswitcher and gallery are used in a simple way. Now let's look at their basic usage.

 

 

 

1. Configure the layout file main. xml

 

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <relativelayout xmlns: Android = "http://schemas.android.com/apk/res/android" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "fill_parent" <br/> <imageswitcher <br/> Android: Id = "@ + ID/imageswitcher" <br/> Android: layout_width = "wrap_content" <br/> Android: layout_height = "wrap_content" <br/> Android: layout_centerinparent = "true"/> <br/> <gallery <br/> Android: Id = "@ + ID/Gallery" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "wrap_content" <br/> Android: spacing = "8dp" <br/> Android: layout_alignparentbottom = "true"/> <br/> </relativelayout> <br/>

2. Main program code mainactivity. Java

 

 

Package COM. yin. picture_view; </P> <p> Import android. app. activity; <br/> Import android. content. context; <br/> Import android. OS. bundle; <br/> Import android. view. view; <br/> Import android. view. viewgroup; <br/> Import android. widget. adapterview; <br/> Import android. widget. adapterview. onitemselectedlistener; <br/> Import android. widget. baseadapter; <br/> Import android. widget. gallery; <br/> Import android. wi DGET. imageswitcher; <br/> Import android. widget. imageview; <br/> Import android. widget. viewswitcher. viewfactory; <br/> public class mainactivity extends activity {</P> <p> // resources for displaying images <br/> Private Static int [] images = {<br/> r. drawable. s0, R. drawable. s1, <br/> r. drawable. s2, R. drawable. s3, <br/> r. drawable. s4, R. drawable. s5, <br/> r. drawable. s6, R. drawable. s7, <br/> r. drawable. s8, R. drawable. s9 <br/> }; <Br/> gallery Gallery; <br/> imageswitcher is; <br/> Public void oncreate (bundle savedinstancestate) {<br/> super. oncreate (savedinstancestate); <br/> setcontentview (R. layout. main); <br/> gallery = (Gallery) findviewbyid (R. id. gallery); <br/> is = (imageswitcher) findviewbyid (R. id. imageswitcher); </P> <p> Gallery. setadapter (New imageadapter (this); <br/> // display the selected image in the center <br/> Gallery. setselection (IMAG Es. length/2); </P> <p> // bind the listener to gallery. <br/> Gallery. setonitemselectedlistener (New onitemselectedlistener () {<br/> Public void onitemselected (adapterview <?> Parent, view, <br/> int position, long ID) {<br/> // when an image is selected in Gallery, imageswitcher synchronously displays the same image. <br/> // position % images. length is used to display images cyclically <br/> is. setimageresource (images [position % images. length]); </P> <p >}< br/> Public void onnothingselected (adapterview <?> Parent) {</P> <p >}< br/>}); </P> <p> is. setfactory (New imagefactory (this); </P> <p >}</P> <p> private class imageadapter extends baseadapter {<br/> private context; <br/> Public imageadapter (context) {<br/> This. context = context; <br/>}< br/> // return images. lenght (), returns integer here. max_value <br/> // is used to display images cyclically <br/> Public int getcount () {<br/> return integer. max_value; <br/>}< br/> Public object getitem (INT position) {<br/> return NULL; <br/>}< br/> Public long getitemid (INT position) {<br/> return 0; <br/>}< br/> Public View getview (INT position, view convertview, viewgroup parent) {<br/> imageview IV = new imageview (context); <br/> IV. setimageresource (images [position % images. length]); <br/> IV. setlayoutparams (new gallery. layoutparams (90,90); <br/> IV. setadjustviewbounds (true); <br/> return IV; <br/>}</P> <p> private class imagefactory implements viewfactory {<br/> private context; <br/> Public imagefactory (context) {<br/> This. context = context; <br/>}< br/> Public View makeview () {<br/> imageview IV = new imageview (context); <br/> IV. setlayoutparams (New imageswitcher. layoutparams (200,200); <br/> return IV; <br/>}< br/>}