ListView Example of horizontal sliding (horizontal sliding) in Android

This article mainly introduces the android to achieve horizontal sliding (transverse sliding) ListView example, this article with its own encapsulation of a control method to solve this requirement, the need for friends can refer to the

The use of horizontal Listview-horizontallistview

Android ListView The default is vertical sliding, due to the requirements of the project, the need for ListView is horizontal sliding. There are many ways to do it, but one of the better ways is to encapsulate a control by itself, using the same way as ListView. Need to improve the place: get to the size of the picture is not processed. The original size of the picture is displayed on the interface. In order to better display the effect, should be compressed into a uniform size.

The Horizontallistview.java code is as follows:

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/** * Horizontal ListView * * * * @author SCD */public class Horizontallistview extends adapterview<listadapter> {  public Boolean Malwaysoverridetouch = true; protected ListAdapter Madapter; private int mleftviewindex =-1; private int mrightviewindex = 0; protected int mcurrentx; protected int mnextx; private int mmaxx = Integer.max_value; private int mdisplayoffset = 0; protected Scroller Mscroller; Private Gesturedetector mgesture; Private queue<view> Mremovedviewqueue = new linkedlist<view> (); Private Onitemselectedlistener monitemselected; Private Onitemclicklistener monitemclicked; Private Onitemlongclicklistener monitemlongclicked; Private Boolean mdatachanged = false;   Public Horizontallistview (context, AttributeSet attrs) {Super (context, attrs); Initview ();}   Privat e synchronized void Initview () {mleftviewindex =-1; mrightviewindex = 0; mdisplayoffset = 0; mcurrentx = 0; mnextx = 0; Mmaxx = Integer.max_value; Mscroller = new Scroller (GetContext ()); Mgesture = new Gesturedetector (GetContext (), mongesture); }   @Override public void Setonitemselectedlistener (Adapterview.onitemselectedlistener listener) { monitemselected = listener; }   @Override public void Setonitemclicklistener (Adapterview.onitemclicklistener listener) {monitemclicked = Listener }   @Override public void Setonitemlongclicklistener (Adapterview.onitemlongclicklistener listener) { monitemlongclicked = listener; }   Private Datasetobserver mdataobserver = new Datasetobserver () {  @Override public void onchanged () {SYNCHR Onized (horizontallistview.this) {mdatachanged = true;} invalidate (); Requestlayout ();   @Override public void oninvalidated () {reset (); invalidate (); Requestlayout ();}  };   @Override public ListAdapter Getadapter () {return madapter.}   @Override public View Getselectedview () {// Todo:implement return null; }   @Override public void Setadapter (ListAdapter adapter) {if(Madapter!= null) {madapter.unregisterdatasetobserver (mdataobserver);} Madapter = adapter; Madapter.registerdatasetobserver (Mdataobserver); Reset (); }   Private synchronized void reset () {Initview (); Removeallviewsinlayout (); Requestlayout ();}   @Override Pub LIC void setselection (int position) {//todo:implement}   private void Addandmeasurechild (final View child, int VI Ewpos) {Layoutparams params = Child.getlayoutparams (); if (params = null) {params = new Layoutparams (Layoutparams.fill_ PARENT, layoutparams.fill_parent); }   Addviewinlayout (Child, Viewpos, params, true); Child.measure (Measurespec.makemeasurespec (GetWidth (), Measurespec.at_most), Measurespec.makemeasurespec ( GetHeight (), measurespec.at_most)); }   @Override protected synchronized void OnLayout (Boolean changed, int left, int. top, int right, int bottom) {Super . OnLayout (changed, left, top, right, bottom);   if (Madapter = null) {return;}   if (mdatachanged) {int oldcurrentX = Mcurrentx; Initview (); Removeallviewsinlayout (); MNEXTX = Oldcurrentx; Mdatachanged = false; }   if (Mscroller.computescrolloffset ()) {int scrollx = Mscroller.getcurrx (); mnextx = SCROLLX;}   if (MNEXTX <= 0) {mnextx = 0; mscroller.forcefinished (true);} if (Mnextx >= mmaxx) {mnextx = Mmaxx; mscroller.forcefinished ( true); }   INT dx = MCURRENTX-MNEXTX;   Removenonvisibleitems (DX); Filllist (DX); Positionitems (DX);   Mcurrentx = MNEXTX;   if (!mscroller.isfinished ()) {post (new Runnable () {@Override public void run () {requestlayout ();}});  } }   private void filllist (final int dx) {int edge = 0; View child = Getchildat (Getchildcount ()-1); if (child!= null) {edge = Child.getright ();} filllistright (Edge, DX);   Edge = 0; Child = Getchildat (0); if (child!= null) {edge = Child.getleft ();} filllistleft (Edge, DX);  }   private void filllistright (int rightedge, final int dx) {while (Rightedge + DX < GetwidTh () && Mrightviewindex < Madapter.getcount ()) {  View child = Madapter.getview (Mrightviewindex, Mremove Dviewqueue.poll (), this); Addandmeasurechild (Child,-1); Rightedge + + child.getmeasuredwidth ();   if (Mrightviewindex = Madapter.getcount ()-1) {Mmaxx = Mcurrentx + Rightedge-getwidth ();}   if (Mmaxx &L T 0) {Mmaxx = 0;} mrightviewindex++; }  }   private void filllistleft (int leftedge, final int dx) {while (Leftedge + dx > 0 && Mleftview Index >= 0) {View child = Madapter.getview (Mleftviewindex, Mremovedviewqueue.poll (), this); Addandmeasurechild (Child , 0); Leftedge-= Child.getmeasuredwidth (); mleftviewindex--; Mdisplayoffset-= Child.getmeasuredwidth (); }   private void Removenonvisibleitems (final int dx) {View child = getchildat (0); while (Child!= null && Child.getright () + dx <= 0) {Mdisplayoffset + = Child.getmeasuredwidth (); Mremovedviewqueue.offer (child); Removeviewinlayout (child); mleftviewindex++; Child = Getchildat (0);  }   child = Getchildat (Getchildcount ()-1); while (child!= null && child.getleft () + dx >= getwidth ()) {mremovedviewqueue.offer (child); removeviewinlayou T (child); mrightviewindex--; Child = Getchildat (Getchildcount ()-1); }   private void Positionitems (final int dx) {if (Getchildcount () > 0) {mdisplayoffset = dx; int left = Mdisp Layoffset; for (int i = 0; i < Getchildcount (); i++) {View child = Getchildat (i); int childwidth = Child.getmeasuredwidth (); chil D.layout (left, 0, left + childwidth, child.getmeasuredheight ()); Left + + Childwidth + child.getpaddingright (); }}   public synchronized void Scrollto (int x) {mscroller.startscroll (mnextx, 0, X-MNEXTX, 0); Requestlayout (); }   @Override public boolean dispatchtouchevent (Motionevent ev) {Boolean handled = super.dispatchtouchevent (EV); Han dled |= mgesture.ontouchevent (EV); return handled; }   Protected Boolean onfling (Motionevent E1, motionevent E2, float Velocityx, float velocityy) {synchronized (horizontallistview.this) {mscroller.fling (MNEXTX, 0, (int)-velocity X, 0, 0, mmaxx, 0, 0); } requestlayout ();   return true; }   Protected Boolean ondown (Motionevent e) {mscroller.forcefinished (true); return true;}   Private Ongesturel Istener mongesture = new Gesturedetector.simpleongesturelistener () {  @Override public boolean ondown (Motionevent E {return HorizontalListView.this.onDown (e);}   @Override public boolean onfling (Motionevent E1, motionevent E2, FL Oat Velocityx, float velocityy) {return horizontallistview.this. Onfling (E1, E2, Velocityx, Velocityy);}   @Overrid E public boolean onscroll (Motionevent E1, motionevent E2, float Distancex, float distancey) {  synchronized (Horizon Tallistview.this) {mnextx + = (int) Distancex;} requestlayout ();   return true; }   @Override public boolean onsingletapconfirmed (Motionevent e) {for (int i = 0; i < Getchildcount (); i++) {ViEW child = Getchildat (i); if (Iseventwithinview (e, child)) {if (monitemclicked!= null) {Monitemclicked.onitemclick (Horizontallistview.this, Child, Mleftviewindex + 1 + i, Madapter.getitemid (mleftviewindex + 1 + i)); } if (monitemselected!= null) {monitemselected.onitemselected (horizontallistview.this, Child, Mleftviewindex + 1 + i, MA Dapter.getitemid (Mleftviewindex + 1 + i)); } break; }   return true; }   @Override public void onlongpress (Motionevent e) {int childcount = Getchildcount (), for (int i = 0; i < child Count; i++) {View child = Getchildat (i); if (Iseventwithinview (e, child)) {if (monitemlongclicked!= null) {monitemlongclicked . Onitemlongclick (Horizontallistview.this, Child, Mleftviewindex + 1 + i, Madapter.getitemid (mleftviewindex + 1 + i)); } break; }}   Private Boolean Iseventwithinview (Motionevent E, View child) {Rect viewrect = new Rect (); int[] Childpositio n = new Int[2]; Child.getlocationonscreen (childposition); int left = Childposition[0]; int right = left + child.getwidth (); int top = childposition[1]; int bottom = top + child.getheight (); Viewrect.set (left, top, right, bottom); return Viewrect.contains ((int) e.getrawx (), (int) E.getrawy ()); } };  }

Adapter Horizontallistviewadapter. Java is as follows:

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public class Horizontallistviewadapter extends Baseadapter {/** contexts/private context mcontext;/** image Data Source * * Private Ar Raylist<map<string, integer>> mimagelist;  /** Data Source * * Private arraylist<map<string, integer>> mtextlist; /** image */private static String Image = "Ic_";   Private map<string, integer> mMap = null;  /** Construction Method/Public Horizontallistviewadapter {this.mcontext = context; InitData ();}  /** Initialization data/public void InitData () {mimagelist = new arraylist<map<string, integer>> ();/* * Reflection Technology/CLASS<?&G T Imageclzz = R.drawable.class; r.drawable instance = new R.drawable (); Gets all the fields in the Drawable class field[] fields = Imageclzz.getdeclaredfields (); for (field Field:fields) {//Get the name of the field String name = Field.getname (); if (name!= null && name.startswith (IMAGE)) {try {mMap = new hashmap<string, integer> (); Mmap.put (IMAGE, (Integer) Field.get (instance); Mimagelist.add (MMAP) ; } CATCH (illegalaccessexception e) {e.printstacktrace ();}}  }     @Override public int GetCount () {return mimagelist.size ():}   @Override public Map<stri Ng, integer> getitem (int position) {  return mimagelist = = null null:mImageList.get (position);}   @Over Ride public long getitemid (int position) {return position.}   @Override public view GetView (int position, View conv Ertview, ViewGroup parent) {  Viewholder holder; if (Convertview = null) {holder = new Viewholder (); Convertview = Layoutinflater.from (Mcontext). Inflate (R.layout.horizontal_list_item, NULL); Holder.mimage = (ImageView) convertview. Findviewbyid (R.id.iv_list_item); Holder.mtitle = (TextView) convertview. Findviewbyid (R.id.tv_list_item); Convertview.settag (holder); else {holder = (Viewholder) Convertview.gettag ();}   if (position = = Mselectindex) {convertview.setselected (True ); else {convertview.setselected (false);} Holder.mImage.setImageResource (GetiTEM (position). Get (IMAGE); return convertview; }   Private class Viewholder {/** image/Private ImageView mimage;}