Android uses Viewpager to implement infinite loops (timed + manual) _android

There are two ways to cycle the carousel, one is the use of a timer another is the use of finger-click, compared to the timer to achieve a circular playback easier, as long as the message in the timer to add a few simple pieces of code can be, the following separately on these two methods to give you detailed details, please see below.

int count = Adapter.getcount (); 
if (Count > 1) {//More than 1, cycle 
  int index = Viewpager.getcurrentitem (); 
  Index = (index + 1)% count; 
  Viewpager.setcurrentitem (index, True); 
}

But how does it support the function of the infinite loop when the finger is clicked? This problem, I have been tossing for a long time, online data is not available.
The funny thing is that in the adapter, the number is set to the maximum value, and then, at the current position, a value in the middle, such as:

public class Myadapter extends pageradapter{  
  @Override public  
  int GetCount () {return  
    integer.max_value;  
  @Override Public  
  boolean isviewfromobject (View arg0, Object arg1) {return  
    arg0 = = arg1;  
  }  
  @Override public  
  void Destroyitem (View container, int position, object object) {(  
    Viewpager) container). Removeview (mimageviews[position% count]);  
  Public Object instantiateitem (view container, int position) {  
      view view = mimageviews[position% count]; 
    ((Viewpager) container). AddView (view, 0);  
    return view;  
  }  
protected void OnCreate (Bundle savedinstancestate) {  
  viewpager.setadapter (new Myadapter ());  
  Sets the default entry for the Viewpager, set to 100 times times the total, to slide to the left at first  
  Viewpager.setcurrentitem (count *);       
}  

This practice, in fact, does not really reach the left and right infinite loops, but generally, it is difficult to reach the boundary (not sliding) situation.

By looking at a lot of data, I found that Viewpager itself does not support the function of the infinite loop, I have to say, this is really a failure.

Because Viewpager itself does not support, we can only find ways to ourselves! Here are my ways to achieve an infinite loop of left and right:
Used to display the mviews, more than the data source mlist, more than two node elements (head node 0:b and tail node 5:e for jumps)
The red line without an arrow in the figure below is the case where the mviews is initialized according to the mlist; the red thread with the arrows is the jump.

The specific code is as follows:

public class Adaptercycle extends Pageradapter implements viewpager.onpagechangelistener{private context Mconte xt Context private Layoutinflater minflater; Used to solve XML private linkedlist<view> mviews; <span style= "font-family:arial, Helvetica, Sans-serif;" > For </span><span style= "font-family:arial, Helvetica, Sans-serif;" > shows the view</span> private list<drawable> mlist; Data source <span style= "font-family:arial, Helvetica, Sans-serif;" >Drawable</span> private Viewpager Mviewpager; Page Public adaptercycle (context context, Viewpager Viewpager, list<drawable> List) {mcontext = Co 
    ntext 
    Minflater = Layoutinflater.from (context); 
    Mviewpager = Viewpager; 
      if (list!= null) {//whether or not more than 1, initialize the first (index:0) mviews = new linkedlist<view> (); 
      ImageView view = (ImageView) minflater.inflate (r.layout.activity_main_item_cycle, NULL); drawable drawable = LisT.get (List.size ()-1); 
      View.setimagedrawable (drawable); 
      Mviews.add (view); Note that if there are more than 1 mviews, two more than Mlist (one at a tail)//assumption: Mlist for mlist[0~n-1], mviews for mviews[0~n+1]//mviews[0], M Views[i] mlist[i-1], mviews[n+1] put mlist[0]//mviews[1~n to be used for loops; before the first mviews[0] and after the end of mviews[n+1] for the jump//First MVI Ews[0], jump to the end (N), after the final mviews[n+1], jump to the first (1) if (List.size () > 1) {//More than 1 to loop for (drawable d:list) {//  The Middle N (index:1~n) ImageView v = (imageview) minflater.inflate (r.layout.activity_main_item_cycle, 
          NULL); 
          V.setimagedrawable (d); 
        Mviews.add (v); }//Last (index:n+1) view = (ImageView) minflater.inflate (r.layout.activity_main_item_cycle 
        , null); 
        drawable = dlist.get (0); 
        View.setimagedrawable (drawable); 
      Mviews.add (view); 
  @Override public int GetCount () {return mviews.size (); } @Override 
  public Boolean isviewfromobject (view view, Object object) {return view = = object; @Override public void Destroyitem (ViewGroup container, int position, object object) {(Viewpager) container) 
  . Removeview (Mviews.get (position)); @Override public Object Instantiateitem (viewgroup container, int position) {View view = Mviews.get (position) 
    ; 
    Container.addview (view); 
  return view; }//Implement Viewpager.onpagechangelistener interface @Override public void onpageselected (int position) {Logutils.logi (T 
    AG, "onpageselected:" + position);  if (Mviews.size () > 1) {//More than 1, the loop jumps if (position < 1) {//First, jumps to the end (N) position = Mlist.size (); 
      Note that this is mlist, not mviews Mviewpager.setcurrentitem (position, false);  
        else if (Position > Mlist.size ()) {///After the end, jump to First (1) Mviewpager.setcurrentitem (1, false);//false: Animations that do not show the jump process 
      Position = 1; "}}} @Override public void Onpagescrolled (int position, float positionoffset, int positionoffsetpixels) {//Do nothing} @Override Publ IC void onpagescrollstatechanged (int state) {//Nothing}}//On the outer layer, set Mviewpager initial position to 1 if (madaptercycle.ge Tcount () > 1) {//More than 1, cycle and turn on timer mviewpager.setcurrentitem (1);//set Mviewpager initial position to 1 starttimer ();//open timer, timing  Toggle Page}

At this time, the use of timers, to achieve a circular carousel, you need to modify the following:

int count = Adapter.getcount (); 
if (Count > 2) {//In fact, more than 1, more than 3 
  int index = Viewpager.getcurrentitem (); 
  index = index% (count-2) + 1; 
  Viewpager.setcurrentitem (index, TRUE) has been modified here;