Viewpager achieves carousel image effects

In many apps, we have the carousel effect, especially for some e-commerce apps. Most of them have this function. Today we simply imitate it and there is a small automatic beating function, this can be implemented by using a timer. If you don't need to talk about it, directly use the code:

Import Java. util. arraylist; import Java. util. concurrent. executors; import Java. util. concurrent. scheduledexecutorservice; import Java. util. concurrent. timeunit; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. message; import android. support. v4.view. pageradapter; import android. support. v4.view. viewpager; import android. support. v4.view. viewpager. onpagechangelis Tener; import android. view. view; import android. view. viewgroup; import android. widget. imageview; import android. widget. textview; public class mainactivity extends activity {private int imageids []; private string [] titles; private arraylist <imageview> images; private arraylist <View> dots; private textview title; private viewpager mviewpager; private viewpageradapter adapter; private int oldposition = 0; // record the previous Location of the next point: Private int currentitem; // Private scheduledexecutorservice on the current page; @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. activity_main); // image ID imageids = new int [] {R. drawable. a, R. drawable. b, R. drawable. c, R. drawable. d, R. drawable. e}; // image title titles = new string [] {"Gong Li is not vulgar, so I can't be vulgar", "I'm back! Sing a classic old song to attract a chorus of thousands of people "," reveal how Beijing movies are upgraded "," letv TV edition big delivery "," hot-blooded anti-Kill "}; // The displayed image images = new arraylist <imageview> (); For (INT I = 0; I <imageids. length; I ++) {imageview = new imageview (this); imageview. setbackgroundresource (imageids [I]); images. add (imageview);} // The displayed vertex DOTS = new arraylist <View> (); dots. add (findviewbyid (R. id. dot_0); dots. add (findviewbyid (R. id. dot_1); dots. add (findviewbyid (R. id. dot_2); dots. add (findviewbyid (R. id. dot_3); dots. add (findviewbyid (R. id. dot_4); Title = (textview) findviewbyid (R. id. title); title. settext (Titles [0]); mviewpager = (viewpager) findviewbyid (R. id. vp); adapter = new viewpageradapter (); mviewpager. setadapter (adapter); mviewpager. setonpagechangelistener (New onpagechangelistener () {@ overridepublic void onpageselected (INT position) {Title. settext (Titles [position]); dots. get (oldposition ). setbackgroundresource (R. drawable. dot_normal); dots. get (position ). setbackgroundresource (R. drawable. dot_focused); oldposition = position; currentitem = position ;}@ overridepublic void onpagescrolled (INT arg0, float arg1, int arg2) {}@ overridepublic void merge (INT arg0) {}});} private class viewpageradapter extends pageradapter {@ overridepublic int getcount () {return images. size () ;}// whether the same image is @ overridepublic Boolean isviewfromobject (view arg0, object arg1) {return arg0 = arg1 ;}@ overridepublic void destroyitem (viewgroup view, int position, object) {view. removeview (images. get (position) ;}@ overridepublic object instantiateitem (viewgroup view, int position) {view. addview (images. get (position); Return images. get (position) ;}@ overrideprotected void onstart () {// todo auto-generated method stubsuper. onstart (); scheduledexecutorservice = executors. newsinglethreadscheduledexecutor (); // switches an image scheduledexecutorservice every two seconds. schedulewithfixeddelay (New viewpagertask (), 2, 2, timeunit. seconds);} // switch the image private class viewpagertask implements runnable {@ overridepublic void run () {currentitem = (currentitem + 1) % imageids. length; // update the handler interface. obtainmessage (). sendtotarget () ;}} private handler = new handler () {@ overridepublic void handlemessage (Message MSG) {// set mviewpager on the current page. setcurrentitem (1 );}};}

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Viewpager achieves carousel image effects