If you write an Android desktop slide to toggle the screen control (ii)

In ViewGroup execution:

public void Snaptoscreen (int whichscreen) {whichscreen = Math.max (0, Math.min (Whichscreen, Getchildcount ()-1)); Boolean  Changingscreens = whichscreen! = Mcurrentscreen;mnextscreen = Whichscreen;int mscrollx = This.getScrollX (); final int NewX = Whichscreen * GetWidth (); final int delta = NEWX-MSCROLLX; System.out.println ("====snaptoscreen delta=" +delta); <strong>mscroller.startscroll (MSCROLLX, 0, Delta, 0, Math.Abs (Delta) * 2); This means that it is important to slide the delta distance from the position of the x-coordinate mscrollx </strong>//invalidate, or you can move a little page without restoring the original invalidate ();}

To make this animation work, we have to reload Computescroll

@Overridepublic void Computescroll () {if (<strong>mscroller.computescrolloffset () </strong>) {<strong >scrollto (Mscroller.getcurrx (), Mscroller.getcurry ());     Postinvalidate (); </strong>} else if (mnextscreen! =-1) {<strong>//This is done after the slide is completed, this time must set the current view</ Strong>setcurrentscreen (Math.max (0,math.min (Mnextscreen, Getchildcount ()-1))); mnextscreen =-1;}}

If this viewgroup loads too many child controls at once, it will have a significant impact on performance, in order to solve this problem, we should display the current control, the other should be visible to null

This is handled by:

void Setcurrentscreen (int index) {mcurrentscreen = Index;resetvisibilityforchildren ();} private void Resetvisibilityforchildren () {    int count = Getchildcount ();    for (int i = 0; i < count; i++) {        View child = Getchildat (i);        if (Math.Abs (mcurrentscreen-i) <= 0) {            child.setvisibility (view.visible);        } else {            Child.setvisibility (view.invisible);}}}    

To show the next page in order to slide, we have to rewrite Dispatchdraw

@Overrideprotected void Dispatchdraw (canvas canvas) {int childCount = Getchildcount (); if (ChildCount = = 0) {return;} Boolean restore = False;int Restorecount = 0;final Long drawingtime = Getdrawingtime (); final float Scrollpos = (float) get SCROLLX ()/getwidth (); final int leftscreen = (int) scrollpos;final int rightscreen = Leftscreen + 1;if (leftscreen >= 0 && Leftscreen < childCount) {<strong>drawchild (canvas, Getchildat (leftscreen), drawingtime);// This will cause Leftscreen to be shown by the Gone state </strong>}if  (Rightscreen < Getchildcount ()) {drawchild (canvas, Getchildat ( Rightscreen), drawingtime);} if (restore) {canvas.restoretocount (Restorecount);}}

Here's how to add dot to this interface to indicate which interface is currently sliding:

In the MyGroup class, add:

public void Setmlistener (Onviewchangedlistener mlistener) {this.mlistener = Mlistener;}     Public interface Onviewchangedlistener {/** * when view changed.     * @param viewindex Index.    */void onviewchanged (int viewindex);}     private static final int default_point_margin = 5;/** * Updates the state of the point, including the total and current position.     * @param dotslayout is used to place points of layout.     * Total number @param.     * @param current position.     * @param state Bundle, Parameter extension, can be null.  */public static void Updatedots (ViewGroup dotslayout, int, int, Bundle state) {if (total        < 0) {total = 0;        } int lastIndex =-1;        Object tag = Dotslayout.gettag (r.id.dots_current);        if (tag! = null) {LastIndex = (Integer) tag;        } int margin = Default_point_margin;        if (state = null) {margin = State.getint (key_point_margin, margin);                } int childrennum = Dotslayout.getchildcount ();for (int i = Childrennum, i < total; i++) {ImageView Pointview = new ImageView (Dotslayout.getcontext ());            Pointview.setimageresource (R.drawable.dot);            Dotslayout.addview (Pointview);            Linearlayout.layoutparams params = (linearlayout.layoutparams) pointview.getlayoutparams ();            Params.leftmargin = margin;        Params.rightmargin = margin;        } for (int i = childrenNum-1; I >= total; i--) {Dotslayout.removeviewat (i);        } if (current = = LastIndex) {return; } if (lastIndex >= 0 && lastIndex < total) {ImageView Pointview = (ImageView) dot            Slayout.getchildat (LastIndex);        Pointview.setimageresource (R.drawable.dot); } if (current >= 0 && current < total) {ImageView Pointview = (ImageView) dotslay            Out.getchildat (current); Pointview.setimageresource (r.drawabLe.dot_current);    } dotslayout.settag (r.id.dots_current, current); } public interface Workspacesnaplistener {void Onsnaptoscreen (MyGroup workspace, int whichscreen);} public void Setsnaplistener (Workspacesnaplistener listener) {Snaplistener = listener;}

@Overridepublic void Computescroll () {if (Mscroller.computescrolloffset ()) {} else if (mnextscreen! =-1) {<strong> if (Mlistener! = null) {mlistener.onviewchanged (mcurrentscreen);} </strong>}}

public void Snaptoscreen (int whichscreen) {<strong>if (Snaplistener! = null) {Snaplistener.onsnaptoscreen (this, Whichscreen);} </strong>}

In the layout of mainactivity, add:

<?xml version= "1.0" encoding= "Utf-8"? ><framelayout xmlns:android= "http://schemas.android.com/apk/res/ Android "    android:id=" @+id/mainroot "    android:layout_width=" fill_parent "    android:layout_height=" fill _parent "    >    <com.ringcentral.android.utils.ui.widget.mygroup       android:background=" @drawable/ Help_background_selector "        android:id=" @+id/workspace "        android:layout_width=" Fill_parent "        android: layout_height= "Fill_parent"        />         <linearlayout android:id= "@+id/dots_layout"        android:layout_ Width= "Wrap_content"        android:layout_height= "wrap_content"        android:layout_marginbottom= "28dip        " Android:layout_gravity= "Bottom|center_horizontal"        android:orientation= "Horizontal"/></FrameLayout >

Point of drawing:

<?xml version= "1.0" encoding= "Utf-8"? ><shape xmlns:android= "Http://schemas.android.com/apk/res/android"    android:shape= "Oval" >    <size android:width= "6dip" android:height= "6dip"/>    <solid android: Color= "#7fffffff"/></shape>

OnCreate

@Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Requestwindowfeature (Window.feature_no_title); Setcontentview (R.layout.activity_main); Final ViewGroup dotslayout = (viewgroup) Findviewbyid (r.id.dots_layout); final int[] images = new Int[]{r.drawable.help_ 01,r.drawable.help_02,r.drawable.help_03};final mygroup MyGroup = (mygroup) Findviewbyid (R.id.workspace); final Bundle dotsstate = new bundle (); int margin = Getresources (). Getdimensionpixelsize (R.dimen.workspace_dot_margin); Dotsstate.putint (Mygroup.key_point_margin, MARGIN);        Mygroup.updatedots (dotslayout, images.length, 0, dotsstate); for (int i = 0; i < 3; i++) {final View item = Getlayoutinflater (). Inflate (r.layout.introduction_item_test, null); Mygro Up.addview (item), final ImageView ImageView = (ImageView) Item.findviewbyid (R.id.introduction_image_view); try { Imageview.setimageresource (Images[i]);} catch (OutOfMemoryError e) {}} mygroup.setmlistener (New OnviewchangedliStener () {@Override public void onviewchanged (int. viewindex) {mygroup.updatedots (do            Tslayout, Images.length, ViewIndex, dotsstate); }}); Mygroup.setsnaplistener (new Workspacesnaplistener () {@Overridepublic void Onsnaptoscreen (MyGroup workspace, in T whichscreen) {mygroup.updatedots (dotslayout, Images.length, Whichscreen, dotsstate);}});

:

Code: http://download.csdn.net/detail/baidu_nod/7731855