Simple flip effects of images in Android

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Public class pagewidget extends view {private bitmap foreimage; private bitmap bgimage; private pointf touchpt; private int screenwidth; private int screenheight; private gradient; private gradientdrawable gradient; private colormatrixcolorfilter mcolormatrixfilter; private scroller mscroroller; private int lasttouchx; Public pagewidget (context) {super (Conte XT); // todo auto-generated constructor stub touchpt = new pointf (-1,-1); // argb A (0-transparent, 255-opaque) int [] color = {0xb03333, 0x00333333}; shadowdrawablerl = new gradientdrawable (gradientdrawable. orientation. right_left, color); shadowdrawablerl. setgradienttype (gradientdrawable. linear_gradient); shadowdrawablelr = new gradientdrawable (gradientdrawable. orientation. left_right, color); shadowdrawablelr. Setgradienttype (gradientdrawable. linear_gradient); float array [] = {0.55f, 0, 0, 0, 80 then f, 0, 0.55f, 0, 0, 80 then f, 0, 0, 0.55f, 0, 80 then F, 0, 0, 0, 0.2f, 0}; colormatrix CM = new colormatrix (); cm. set (array ); /** | A * 0.55 + 80 | * | r * 0.55 + 80 | * | G * 0.55 + 80 | * | B * 0.2 | * // cm. setsaturation (0); mcolormatrixfilter = new colormatrixcolorfilter (CM); // use the scroll bar to achieve the animated Effect of New scroller (con Text) ;}@ override public void computescroll () {// todo auto-generated method stub if (mscroller. computescroloffset () {touchpt. X = mscroller. getcurrx (); touchpt. y = mscroller. getcurry (); postinvalidate ();} else {// touchpt. X =-1; // touchpt. y =-1;} super. computescroll ();} public void setscreen (INT screenwidth, int screenheight) {This. screenwidth = screenwidth; this. screenheight = screenheigh T;} public bitmap getforeimage () {return foreimage;} public void setforeimage (Bitmap foreimage) {This. foreimage = foreimage;} public bitmap getbgimage () {return bgimage;} public void setbgimage (Bitmap bgimage) {This. bgimage = bgimage;} @ override protected void ondraw (canvas) {// todo auto-generated method stub drawpageeffect (canvas); super. ondraw (canvas);}/** draw foreground image * @ Param ca Nvas */private void drawforceimage (canvas) {// todo auto-generated method stub paint mpaint = new paint (); If (foreimage! = NULL) {canvas. drawbitmap (foreimage, 0, 0, mpaint);}/*** draw background image * @ Param canvas */private void drawbgimage (canvas, Path) {// todo auto-generated method stub paint mpaint = new paint (); If (bgimage! = NULL) {canvas. save (); // draw a canvas only at the intersection of the path. clippath (path, op. intersect); canvas. drawbitmap (bgimage, 0, 0, mpaint); canvas. restore () ;}/ *** paging effect * @ Param canvas */private void drawpageeffect (canvas) {// todo auto-generated method stub drawforceimage (canvas ); paint mpaint = new paint (); If (touchpt. x! =-1 & touchpt. y! =-1) {// flip the left-side canvas. drawline (touchpt. x, 0, touchpt. x, screenheight, mpaint); // shadowdrawablerl is painted on the left side of the book. setbounds (INT) touchpt. x-20, 0, (INT) touchpt. x, screenheight); shadowdrawablerl. draw (canvas); // float halfcut = touchpt. X + (screenwidth-touchpt. x)/2; canvas. drawline (halfcut, 0, halfcut, screenheight, mpaint); // flip the page on the left and rect backarea = new rect (INT) touchpt. x, 0, (INT) halfcut, screenheight); paint backpaint = new paint (); backpaint. setcolor (0xffdacab0); canvas. drawrect (backarea, backpaint); // flip the front of the flip image horizontally and pan it to touchpt. X point paint fbpaint = new paint (); fbpaint. setcolorfilter (mcolormatrixfilter); matrix = new matrix (); matrix. prescale (-1, 1); matrix. posttranslate (foreimage. getwidth () + touchpt. x, 0); canvas. save (); canvas. cliprect (backarea); canvas. drawbitmap (foreimage, matrix, fbpaint); canvas. restore (); // place the shadowdrawablerl on the left. setbounds (INT) halfcut-50, 0, (INT) halfcut, screenheight); shadowdrawablerl. draw (canvas); Path bgpath = New Path (); // The bgpath of the background image is displayed. addrect (New rectf (halfcut, 0, screenwidth, screenheight), direction. CW); // fold the background drawbgimage (canvas, bgpath) On the right side; // draw the shadowdrawablelr on the right side. setbounds (INT) halfcut, 0, (INT) halfcut + 50, screenheight); shadowdrawablelr. draw (canvas) ;}@ override public Boolean ontouchevent (motionevent event) {// todo auto-generated method stub if (event. getaction () = motionevent. action_down) {touchpt. X = event. getx (); touchpt. y = event. gety ();} else if (event. getaction () = motionevent. action_move) {lasttouchx = (INT) touchpt. x; touchpt. X = event. getx (); touchpt. y = event. gety (); postinvalidate ();} else if (event. getaction () = motionevent. action_up) {int dx, Dy; DY = 0; // slide right IF (lasttouchx <touchpt. x) {dx = foreimage. getwidth ()-(INT) touchpt. X + 30;} else {// slide dx =-(INT) touchpt to the left. x-foreimage. getwidth ();} mscroller. startscroll (INT) touchpt. x, (INT) touchpt. y, dx, Dy, 1000); postinvalidate () ;}// it must be true; otherwise, the action_move and action_up events return true;} cannot be obtained ;}} public class pageactivity extends activity {protected void oncreate (Android. OS. bundle savedinstancestate) {requestwindowfeature (window. feature_no_title); pagewidget = new pagewidget (this); display = getwindowmanager (). getdefadisplay display (); int width = display. getwidth (); int Height = display. getheight (); pagewidget. setscreen (width, height); bitmap bm1 = bitmapfactory. decoderesource (getresources (), R. drawable. pre7); bitmap bm2 = bitmapfactory. decoderesource (getresources (), R. drawable. after7); bitmap foreimage = bitmap. createscaledbitmap (bm1, width, height, false); bitmap bgimage = bitmap. createscaledbitmap (bm2, width, height, false); pagewidget. setbgimage (bgimage); pagewidget. setforeimage (foreimage); setcontentview (pagewidget); super. oncreate (savedinstancestate );};}