android中简单的图片翻页效果
16lz
2021-01-23
参考http://www.blogjava.net/wangxinsh55/archive/2011/09/21/359146.html实现，具体代码如下：
public class PageWidget extends View {private Bitmap foreImage;private Bitmap bgImage;private PointF touchPt;private int screenWidth;private int screenHeight;private GradientDrawable shadowDrawableRL;private GradientDrawable shadowDrawableLR;private ColorMatrixColorFilter mColorMatrixFilter;private Scroller mScroller;private int lastTouchX;public PageWidget(Context context) {super(context);// TODO Auto-generated constructor stubtouchPt = new PointF(-1,-1);//ARGB A(0-透明,255-不透明) int[] color = { 0xb0333333 ,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, 80.0f, 0 ,0.55f, 0, 0, 80.0f, 0 , 0,0.55f, 0, 80.0f, 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); //利用滚动条来实现接触点放开后的动画效果 mScroller = new Scroller(context);}@Overridepublic void computeScroll() {// TODO Auto-generated method stubif (mScroller.computeScrollOffset()) {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 = screenHeight;}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;}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubdrawPageEffect(canvas);super.onDraw(canvas);}/** * 画前景图片 * @param canvas */private void drawForceImage(Canvas canvas) {// TODO Auto-generated method stubPaint mPaint = new Paint();if (foreImage!=null) {canvas.drawBitmap(foreImage, 0, 0, mPaint);}}/** * 画背景图片 * @param canvas */private void drawBgImage(Canvas canvas,Path path) {// TODO Auto-generated method stubPaint mPaint = new Paint();if (bgImage!=null) {canvas.save();//只在与路径相交处画图canvas.clipPath(path,Op.INTERSECT);canvas.drawBitmap(bgImage, 0, 0, mPaint);canvas.restore();}}/** * 画翻页效果 * @param canvas */private void drawPageEffect(Canvas canvas) {// TODO Auto-generated method stubdrawForceImage(canvas);Paint mPaint = new Paint();if (touchPt.x!=-1 && touchPt.y!=-1) {//翻页左侧书边canvas.drawLine(touchPt.x, 0, touchPt.x,screenHeight, mPaint);//左侧书边画阴影shadowDrawableRL.setBounds((int)touchPt.x - 20, 0 ,(int)touchPt.x, screenHeight);shadowDrawableRL.draw(canvas);//翻页对折处float halfCut = touchPt.x + (screenWidth - touchPt.x)/2;canvas.drawLine(halfCut, 0, halfCut, screenHeight, mPaint);//对折处左侧画翻页页图片背面Rect backArea = new Rect((int)touchPt.x,0,(int)halfCut,screenHeight);Paint backPaint = new Paint();backPaint.setColor(0xffdacab0);canvas.drawRect(backArea, backPaint);//将翻页图片正面进行处理水平翻转并平移到touchPt.x点Paint fbPaint = new Paint();fbPaint.setColorFilter(mColorMatrixFilter);Matrix 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();//对折处画左侧阴影shadowDrawableRL.setBounds((int)halfCut - 50, 0 ,(int)halfCut, screenHeight);shadowDrawableRL.draw(canvas);Path bgPath = new Path();//可以显示背景图的区域bgPath.addRect(new RectF(halfCut,0,screenWidth,screenHeight), Direction.CW);//对折出右侧画背景drawBgImage(canvas,bgPath);//对折处画右侧阴影shadowDrawableLR.setBounds((int)halfCut, 0 ,(int)halfCut + 50, screenHeight);shadowDrawableLR.draw(canvas);}}@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubif (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;//向右滑动if (lastTouchX效果图如下：
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