Android study notes 23: slides

You can use gallary and imageswitcher to view slide images in Android, for example, windows.

Use gallary as the image selection part and imageswitcher as the image display part.

<? XML version = "1.0" encoding = "UTF-8"?> <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" Android: Orientation = "vertical" Android: layout_width = "fill_parent" Android: layout_height = "fill_parent"> <! -- Define an imageswitcher component --> <imageswitcher Android: Id = "@ + ID/switcher" Android: layout_width = "320dp" Android: layout_height = "320dp"/> <! -- Define a gallery component --> <gallery Android: Id = "@ + ID/Gallery" Android: layout_width = "fill_parent" Android: layout_height = "wrap_content" Android: layout_margintop = "25dp" Android: unselectedalpha = "0.6" Android: spacing = "3pt"/> </linearlayout>

Customize a baseadapter as the gallary data source, set a setonitemselectedlistener as the listener, change the image in imageswitcher in real time, and use tyoedarray to save the attribute values in the gallery.

Public class gallarytest extends activity {int [] imageids = new int [] {R. drawable. shuangzi, R. drawable. shuangyu, R. drawable. chunv, R. drawable. tiancheng, R. drawable. tianxie, R. drawable. sheshou, R. drawable. juxie, R. drawable. shuiping, R. drawable. shizi, R. drawable. yang, R. drawable. jinniu, R. drawable. mojie}; @ overridepublic void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcont Entview (R. layout. main); Final gallery = (Gallery) findviewbyid (R. id. gallery); // obtain the imageswitcher object final imageswitcher switcher = (imageswitcher) findviewbyid (R. id. switcher); // set the viewfactory object Switcher for the imageswitcher object. setfactory (New viewfactory () {@ overridepublic view makeview () {imageview = new imageview (gallarytest. this); imageview. setbackgroundcolor (0xff0000); imageview. setscalet Ype (imageview. scaletype. fit_center); imageview. setlayoutparams (New imageswitcher. layoutparams (layoutparams. wrap_content, layoutparams. wrap_content); Return imageview ;}}); // sets the animation effect Switcher for image replacement. setinanimation (animationutils. loadanimation (this, android. r. anim. fade_in); switcher. setoutanimation (animationutils. loadanimation (this, android. r. anim. fade_out); // creates a baseadapter object that provides the baseadap for the image displayed by Gallery. TER adapter = new baseadapter () {@ overridepublic int getcount () {return imageids. length ;}@ overridepublic object getitem (INT position) {return position ;}@ overridepublic long getitemid (INT position) {return position ;} // The returned view of this method represents each list item @ overridepublic view getview (INT position, view convertview, viewgroup parent) {// create an imageviewimageview imageview = new imageview (gallarytest. this); imageview. setima Geresource (imageids [position % imageids. length]); // sets the Image view scaling type. setscaletype (imageview. scaletype. fit_xy); // increase or decrease the image size to display the imageview. setlayoutparams (new gallery. layoutparams (75,100); // use tyoedarray to save the property value typedarray = obtainstyledattributes (R. styleable. gallery); imageview. setbackgroundresource (typedarray. getresourceid (R. styleable. gallery_android_galleryitemba Ckground, 0); Return imageview ;}}; Gallery. setadapter (adapter); Gallery. setonitemselectedlistener (New onitemselectedlistener () {// This method is triggered when the selected gallery item changes @ overridepublic void onitemselected (adapterview <?> Parent, view, int position, long ID) {switcher. setimageresource (imageids [position % imageids. Length]) ;}@ overridepublic void onnothingselected (adapterview <?> Parent ){}});}}