"Android" Android picture Carousel

First step, write a layout file first

<com.main.util.slideshowview                 android:id= "@+id/slideshowview"                android:layout_width= "Fill_parent"                android:layout_height= "300DP"                android:layout_centerhorizontal= "true"                />

The second step, the Java code

Package Com.main.util;import Java.util.arraylist;import Java.util.list;import java.util.concurrent.Executors; Import Java.util.concurrent.scheduledexecutorservice;import Java.util.concurrent.timeunit;import Com.main.R; Import Android.content.context;import Android.graphics.drawable.drawable;import Android.os.handler;import Android.os.message;import Android.os.parcelable;import Android.support.v4.view.pageradapter;import Android.support.v4.view.viewpager;import Android.support.v4.view.viewpager.onpagechangelistener;import Android.util.attributeset;import Android.view.layoutinflater;import Android.view.view;import Android.widget.framelayout;import Android.widget.imageview;import Android.widget.imageview.scaletype;public Class    SlideShowView extends Framelayout {//Carousel graph picture number private final static int image_count = 5;    Self-active carousel interval private final static int time_interval = 5;         Own active carousel enable switch private final static Boolean isautoplay = true; Self-defining the resource ID of the Carousel Map private int[] ImagesrEsids;    The ImageView List private list<imageview> imageviewslist of the carousel picture;        The List private list<view> dotviewslist of the point View;    Private Viewpager Viewpager;    Current Carousel page private int currentitem = 0;    Timed tasks private Scheduledexecutorservice scheduledexecutorservice;            Handler private Handler Handler = new Handler () {@Override public void Handlemessage (Message msg) {            TODO auto-generated Method Stub super.handlemessage (msg);        Viewpager.setcurrentitem (CurrentItem);        }            };        Public SlideShowView (Context context) {this (context,null); TODO auto-generated Constructor stub} public SlideShowView (context context, AttributeSet Attrs) {This (CO        ntext, attrs, 0);        TODO auto-generated Constructor stub} public SlideShowView (context context, AttributeSet attrs, int defstyle) {        Super (context, attrs, Defstyle); TODO auto-generated ConstrUctor stub initdata ();        Initui (context);        if (isautoplay) {startplay (); }}/** * Start carousel switch */private void Startplay () {scheduledexecutorservice = Executors.newsin        Glethreadscheduledexecutor ();    Scheduledexecutorservice.scheduleatfixedrate (New Slideshowtask (), 1, 4, timeunit.seconds);    }/** * Stop carousel Graph Toggle */private void Stopplay () {Scheduledexecutorservice.shutdown (); /** * Initialize related data */private void InitData () {imagesresids = new int[]{//picture data r.drawab        LE.P1, R.DRAWABLE.P2,};        Imageviewslist = new arraylist<imageview> ();            Dotviewslist = new arraylist<view> (); }/** * Initialize views and other UI */private void Initui (context context) {Layoutinflater.from (context). Inflate (R.L        Ayout.imageviewpager, this, true); for (int imageid:imagesresids) {ImageView view = new ImageView (conText);            View.setimageresource (ImageID);            View.setscaletype (SCALETYPE.FIT_XY);        Imageviewslist.add (view);        } dotviewslist.add (Findviewbyid (R.ID.V_DOT1));                Dotviewslist.add (Findviewbyid (R.id.v_dot2));        Viewpager = (Viewpager) Findviewbyid (R.id.viewpager);                Viewpager.setfocusable (TRUE);        Viewpager.setadapter (New Mypageradapter ());    Viewpager.setonpagechangelistener (New Mypagechangelistener ()); }/** * Fill Viewpager page adapter * @author caizhiming */Private class Mypageradapter extends Pageradapter {@Override public void Destroyitem (View container, int position, object object) {//TODO auto-g            enerated method Stub//((Viewpag.er) container). Removeview ((View) object);        ((Viewpager) container). Removeview (Imageviewslist.get (position)); } @Override Public Object instantiateitem (View container, int position) {//TODO auto-generated Method Stub ((Viewpager) container). AddView (Imageviewslist.get (position));        return Imageviewslist.get (position); } @Override public int getcount () {//TODO auto-generated method stub return Imagevie        Wslist.size (); } @Override public boolean isviewfromobject (View arg0, Object arg1) {//TODO auto-generated Meth        OD stub return arg0 = = Arg1; } @Override public void Restorestate (parcelable arg0, ClassLoader arg1) {//TODO auto-generated             Method stub} @Override public Parcelable saveState () {//TODO auto-generated method stub        return null;        } @Override public void Startupdate (View arg0) {//TODO auto-generated method stub}                    @Override public void Finishupdate (View arg0) {//TODO auto-generated method stub      }      }/** * Viewpager listener * Called when the state of the page in Viewpager has changed * @author caizhiming */Private class Mypagech        Angelistener Implements onpagechangelistener{Boolean isautoplay = false;            @Override public void onpagescrollstatechanged (int arg0) {//TODO auto-generated method stub                Switch (arg0) {case 1://gesture swipe, spare in isautoplay = false;            Break                Case 2://Interface Switch isautoplay = true;            Break Case 0://Slide end, that is, the switch is complete or load complete//current is the last one, this time from right to left slide, then switch to the first if (viewpager.getcurrentitem () = = view                Pager.getadapter (). GetCount ()-1 &&!isautoplay) {viewpager.setcurrentitem (0); }//is currently the first one. Now swipe from left to right, switch to the last else if (viewpager.getcurrentitem () = = 0 &&!isautoplay) {view                Pager.setcurrentitem (Viewpager.getadapter (). GetCount ()-1);} break; }} @Override public void onpagescrolled (int arg0, float arg1, int arg2) {//TODO Auto-ge nerated method stub} @Override public void onpageselected (int pos) {//TODO            auto-generated method Stub currentitem = pos; for (int i=0;i < dotviewslist.size (); i++) {if (i = = pos) {(View) Dotviewslist.get (POS))                . Setbackgroundresource (R.drawable.dot_black);                }else {(View) dotviewslist.get (i)). Setbackgroundresource (R.drawable.dot_white); }}}}/** * Run the Carousel switch task * @author caizhiming */Private class SLIDESHOWTA            SK Implements runnable{@Override public void Run () {//TODO auto-generated method stub      Synchronized (viewpager) {CurrentItem = (currentitem+1)%imageviewslist.size ();          Handler.obtainmessage (). Sendtotarget ();         }}}/** * Destroys ImageView resource, reclaims memory * @author caizhiming */private void Destorybitmaps () {            for (int i = 0; i < Image_count; i++) {ImageView ImageView = Imageviewslist.get (i);            drawable drawable = imageview.getdrawable ();            if (drawable! = null) {//delete drawable correct view reference drawable.setcallback (NULL); }        }    }}

"Android" Android picture Carousel