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Activity_main.xml

<?xml version= "1.0" encoding= "Utf-8"? ><relativelayout xmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent" > <relativelayout android:layout_width= "Match_parent"Android:layout_height= "200DP" > <Android.support.v4.view.ViewPager Android:id= "@+id/viewpager"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:layout_alignparentleft= "true"Android:layout_alignparenttop= "true"/> <LinearLayout Android:id= "@+id/dotlayout"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:layout_alignparentbottom= "true"Android:layout_centerhorizontal= "true"Android:layout_marginbottom= "20DP"android:gravity= "Center"android:orientation= "Horizontal"/> </RelativeLayout></RelativeLayout>

Selecter.xml

<?xml version= "1.0" encoding= "Utf-8"? ><selector xmlns:android= "http://schemas.android.com/apk/res/ Android ">    <item android:state_enabled=" true ">        <shape android:shape=" Oval ">            <size android:height= "10DP" android:width= "10DP" ></size>            <solid android:color= "#aa000000" ></ solid>        </shape>    </item>    <item android:state_enabled= "false" >        <shape Android:shape= "Oval" >            <size android:height= "10DP" android:width= "10DP" ></size>            <solid Android:color= "#aaffffff" ></solid>        </shape>    </item></selector>

 Public classMainactivityextendsappcompatactivity {PrivateList<imageview>list; PrivateLinearLayout dotlayout; Private intpreposition; PrivateViewpager Viewpager; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        InitData ();        Initview (); //open a new thread for automatic scrolling of Viewpager        NewThread (NewRunnable () {@Override Public voidrun () { while(true) {                    Try{Thread.Sleep (3000); } Catch(interruptedexception e) {e.printstacktrace (); }                    //the code in the Runonuithread runs in the main threadRunonuithread (NewRunnable () {@Override Public voidrun () {Viewpager.setcurrentitem (Viewpager.getcurrentitem ()-W);                }                    });    }}). Start (); }    Private voidInitview () {Viewpager=(Viewpager) Findviewbyid (R.id.viewpager); //Constructing AdaptersMyadapter adapter =Newmyadapter (list); //Set AdapterViewpager.setadapter (adapter); //set the number of Viewpager preloaded pages//Viewpager.setoffscreenpagelimit (2);Viewpager.addonpagechangelistener (NewViewpager.onpagechangelistener () {//Viewpager is called during the sliding process@Override Public voidOnpagescrolled (intPositionfloatPositionoffset,intpositionoffsetpixels) {            }            //Viewpager A new page is determined and then called@Override Public voidOnpageselected (intposition) {                //set the previous view to whiteDotlayout.getchildat (preposition). setenabled (false); //set Current view to RedDotlayout.getchildat (position% list.size ()). SetEnabled (true); //assigns the current location to prepositionpreposition = position%list.size (); }            //Viewpager The sliding state changes after the call//0--Static State//the hand is dragging//2--Auto Slide after hand release@Override Public voidOnpagescrollstatechanged (intState )        {            }        }); //set the initial item for ViewpagerViewpager.setcurrentitem (INTEGER.MAX_VALUE/2-3); }    /*** Construct data source*/    Private voidInitData () {dotlayout=(LinearLayout) Findviewbyid (r.id.dotlayout); List=NewArraylist<>(); int[] IMGs =New int[]{r.drawable.a, r.drawable.b, r.drawable.c, R.DRAWABLE.D, R.DRAWABLE.E};  for(intImg:imgs) {            //Create a ImageView using Java codeImageView ImageView =NewImageView ( This); //set picture and ScaleType propertiesImageview.setimageresource (IMG);            Imageview.setscaletype (ImageView.ScaleType.CENTER_CROP);            List.add (ImageView); //Create a View objectView view =NewView ( This); //set the width and height of the viewLinearlayout.layoutparams params =NewLinearlayout.layoutparams ((int) Typedvalue.applydimension (Typedvalue.complex_unit_dip, 8, Getresources (). Getdisplaymetrics ()), (int) Typedvalue.applydimension (Typedvalue.complex_unit_dip, 8, Getresources (). Getdisplaymetrics ()); //set view left margin to prevent view from being linked togetherParams.leftmargin = (int) Typedvalue.applydimension (Typedvalue.complex_unit_dip, 12, Getresources (). Getdisplaymetrics ());            View.setlayoutparams (params); //set the background color, the background uses the selector, can make the view show different colors in different statesView.setbackgroundresource (R.drawable.dot_radiobutton_style); //The enable property of view is false by default (view is all white)View.setenabled (false); //add view into LinearLayoutDotlayout.addview (view); }        //the first view defaults to redDotlayout.getchildat (0). setenabled (true); }}

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