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相信做电子书的同学，都遇到过翻页动画的需求吧，如果你不满足与点击滑动翻页的话，这边文章应该能够帮助到你。
先上个效果图：
效果还是很不错的，不过与ibook那个效果比起来，还是有差距的。应为这个没用到openGL做3D效果，只是用的2d的canvas画布去画的view，添加了阴影效果，还是挺有立体感的。而且比较流畅。openGL实现肯定效果会更好，不过就我目前的技术实力，实现希望还是渺茫的。
废话少说，还是上代码吧：
这里需要两个UI的view类和一个使用方法的demo。
第一个pageTurnerView.java：
第二个view类pageView.java：
相信做电子书的同学，都遇到过翻页动画的需求吧，如果你不满足与点击滑动翻页的话，这边文章应该能够帮助到你。
先上个效果图：
效果还是很不错的，不过与ibook那个效果比起来，还是有差距的。应为这个没用到openGL做3D效果，只是用的2d的canvas画布去画的view，添加了阴影效果，还是挺有立体感的。而且比较流畅。openGL实现肯定效果会更好，不过就我目前的技术实力，实现希望还是渺茫的。
废话少说，还是上代码吧：
这里需要两个UI的view类和一个使用方法的demo。
第一个pageTurnerView.java：
public class PageTurnerViewP1 extends RelativeLayout{
private static final int CORNER_RIGHT_MASK = 1;
private static final int CORNER_TOP_MASK = 2;
public static final int CORNER_BOTTOM_LEFT = 0;
public static final int CORNER_BOTTOM_RIGHT = 1;
public static final int CORNER_TOP_LEFT = 2;
public static final int CORNER_TOP_RIGHT = 3;
private static final int INVALIDATE = 1;
private static final int INITIAL_TIME_DELAY = 100;
private static final int TIME_DELAY = 10;
// private static final int TIME_STEPS = 30;
private boolean mPageTurning;
private boolean mStepping;
public long mNextTime;
private int mTimeStep;
private int mDrawnTimeStep;
private int mCorner;
private Drawable mBackPage;
private Drawable mPageBackground;
private Path mForegroundPath;
private Path mBackPagePath;
private Path mBackgroundPath;
private float mRotation;
private Rect mChildRect = new Rect();
private int mOuterOffsetX;
private int mOuterOffsetY;
public float mPivotX;
private int mPageId;
private PageViewP1 mPage;
private PointF mPageTurnCorner = new PointF();
private PointF mOppositeCorner = new PointF();
private PointF mPageDim = new PointF();
private int mStepLen = 1;
public static final int KEEP = 0;
public static final int NEXT = 1;
public static final int LAST = 2;
public int mWhere = KEEP;
public boolean isBgInit = true;
public boolean isBackInit = true;
private float ax,ay,bx,by,cx,cy,dx,dy,ex,ey,c0x,c0y;
private int mMaxStep=30;
public final Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what != 1) { return; }
// PageTurnerViewP1.this.invalidate();
refreshUI();
// PageTurnerViewP1.this.invalidate((int)bx, (int)ay, (int)dx, (int)dy);
if (PageTurnerViewP1.this.mStepping) { return; }
msg = obtainMessage(1);
long current = SystemClock.uptimeMillis();
if (PageTurnerViewP1.this.mNextTime < current) {
//PageTurnerViewP1.access$102(PageTurnerViewP1.this, current + 10L);
PageTurnerViewP1.this.mNextTime= current + 5L;
}
sendMessageAtTime(msg, PageTurnerViewP1.this.mNextTime);
//PageTurnerViewP1.access$114(PageTurnerViewP1.this, 10L);
PageTurnerViewP1.this.mNextTime+= 5L;
}
};
public PageTurnerViewP1(Context context) {
super(context);
Log.i("==================== PageTurnerViewP1(Context context) =================", "" + this);
}
public PageTurnerViewP1(Context context, AttributeSet attrs) {
super(context, attrs);
// TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PageTurner);
// this.mBackPage = a.getDrawable(1);
// this.mPageBackground = a.getDrawable(0);
//
// this.mPageId = a.getResourceId(3, -1);
//
// this.mCorner = a.getInt(2, 0);
// this.mBackPage = this.getResources().getDrawable(com.tom.clip.R.drawable.a5);
// this.mPageBackground =this.getResources().getDrawable(com.tom.clip.R.drawable.a6);
this.mPageId = -1;
this.mCorner = -1;
}
protected void onFinishInflate() {
super.onFinishInflate();
if (this.mPageId != -1) {
this.mPage = ((PageViewP1)findViewById(this.mPageId));
if (this.mPage != null)
this.mPage.setPageTurner(this);
}
}
public void setPageId(int pageId) {
this.mPageId = pageId;
this.mPage = ((PageViewP1)findViewById(this.mPageId));
if (this.mPage != null)
this.mPage.setPageTurner(this);
}
public int getPageId() {
return this.mPageId;
}
public void setPage(PageViewP1 pageViewP1) {
this.mPage = pageViewP1;
}
public PageViewP1 getPage() {
return this.mPage;
}
public void setCorner(int corner) {
this.mCorner = corner;
}
public int getCorner() {
return this.mCorner;
}
protected void dispatchDraw(Canvas canvas) {
Log.v("log dispatchDraw:", "drawing back page"+mPageTurning);
// if ((this.mPageTurning) && (this.mPage != null) && (computePageTurn())) {
if ((computePageTurn())&& (this.mPageTurning) && (this.mPage != null) ) {
this.mPage.setClipPath(this.mForegroundPath);
}
super.dispatchDraw(canvas);
if (this.mPageTurning) {
drawBackground(canvas);
drawBackPage(canvas);
if (!updateTimeStep()) {
this.mHandler.removeMessages(1);
if (this.mPage != null) {
this.mPage.onPageTurnFinished(canvas);
}
this.mPageTurning = false;
this.mStepping = false;
invalidate();
}
}
}
public void startPageTurn(int mTimeStep) {
if ((this.mPage == null) && (this.mPageId != -1)) {
this.mPage = ((PageViewP1)findViewById(this.mPageId));
}
if (this.mPage == null) {
return;
}
this.mPage.setPageTurner(this);
Drawable d = this.mPage.getPageBackground();
if (d != null) {
this.mPageBackground = d;
}
d = this.mPage.getBackPage();
if (d != null) {
this.mBackPage = d;
}
int corner = this.mPage.getCorner();
if (corner != -1) {
this.mCorner = corner;
}
// this.mStepping=false;
this.mPageTurning = true;
this.mTimeStep = mTimeStep;
this.mDrawnTimeStep = -1;
Message msg = this.mHandler.obtainMessage(1);
this.mNextTime = (SystemClock.uptimeMillis() + 5L);
this.mHandler.sendMessageAtTime(msg, this.mNextTime);
}
public void stepPageTurn() {
if (!this.mStepping) {
this.mStepping = true;
startPageTurn(this.mTimeStep);
} else {
// te((int)bx, 0, (int)mPageTurnCorner.x, (int)mPageTurnCorner.y);
// sendUIhandler();
refreshUI();
}
}
public void refreshUI(){
computePageTurn();
//
this.invalidate();
}
private void sendUIhandler(){
Message msg = this.mHandler.obtainMessage(1);
this.mNextTime = (SystemClock.uptimeMillis() + 30L);
this.mHandler.sendMessageAtTime(msg, this.mNextTime);
}
private boolean updateTimeStep() {
if (this.mTimeStep >mMaxStep || this.mTimeStep<0) {
return false;
}
this.mTimeStep +=mStepLen;
return true;
}
private boolean computePageTurn() {
// if ((this.mDrawnTimeStep == this.mTimeStep) ||(this.mTimeStep <0)||(this.mTimeStep >this.mMaxStep)) {
if ( (this.mTimeStep <0)||(this.mTimeStep >this.mMaxStep)) {
return false;
}
if (this.mPage == null) {
return false;
}
this.mDrawnTimeStep = this.mTimeStep;
View child = this.mPage.getChildAt(0);
child.getDrawingRect(this.mChildRect);
// this.mOuterOffsetX = (child.getLeft() - getLeft());
// this.mOuterOffsetY = (child.getTop() - getTop());
this.mOuterOffsetX = 0;
this.mOuterOffsetY = 0;
float width = this.mChildRect.right;
float height = this.mChildRect.bottom;
if(!mStepping){
this.mPivotX = (this.mTimeStep / 30.0f * width);
}
this.mForegroundPath = new Path();
this.mBackPagePath = new Path();
this.mBackgroundPath = new Path();
float slope = width / (this.mPivotX - width);
float y = this.mPivotX * slope;
this.mPageTurnCorner.x = 0.0F;
this.mPageTurnCorner.y = height;
this.mOppositeCorner.x = width;
this.mOppositeCorner.y = 0.0F;
float x0 = this.mPivotX;
float cornerIntersect = height * width / (height + width);
if ((this.mCorner & 0x1) != 0) {
this.mPageTurnCorner.x = width;
this.mOppositeCorner.x = 0.0F;
x0 = width - x0;
}
if ((this.mCorner & 0x2) != 0) {
this.mPageTurnCorner.y = 0.0F;
this.mOppositeCorner.y = height;
}
this.mPageDim.x = width;
this.mPageDim.y = height;
float page_slope;
if (this.mPivotX <= cornerIntersect) {
page_slope = firstHalfPageTurn(this.mPageDim, this.mPageTurnCorner, this.mOppositeCorner, x0, slope, y);
} else {
page_slope = secondHalfPageTurn(this.mPageDim, this.mPageTurnCorner, this.mOppositeCorner, x0, slope, y);
}
this.mRotation = (float)Math.atan(page_slope);
this.mRotation = (float)(-this.mRotation * 180.0D / 3.141592653589793D);
return true;
}
private float firstHalfPageTurn(PointF pageDim, PointF pageTurnCorner, PointF oppositeCorner, float xPivot, float slope, float y) {
float width = pageDim.x;
float height = pageDim.y;
View child = this.mPage.getChildAt(0);
int innerOffsetX = child.getLeft() - this.mPage.getLeft();
int innerOffsetY = child.getTop() - this.mPage.getTop();
float y1 = height + y;
float x2 = (float)(2.0D * y / (slope + 1.0D / slope));
float y2 = height + x2 / slope;
float page_slope = (height - y2) / (x2 - this.mPivotX);
if ((this.mCorner & 0x1) != 0) {
x2 = width - x2;
page_slope = -page_slope;
}
if ((this.mCorner & 0x2) != 0) {
y1 = height - y1;
y2 = height - y2;
page_slope = -page_slope;
}
float x0 = xPivot;
float x1 = pageTurnCorner.x;
//a点是右上角，b点位左下角，c点为右下角，d点为固定的右下角
ax=this.mOuterOffsetX + x1;
ay=this.mOuterOffsetY + y1;
bx=this.mOuterOffsetX + x2;
by=this.mOuterOffsetY + y2;
cx=this.mOuterOffsetX + x0;
cy=this.mOuterOffsetY + pageTurnCorner.y;
dx=this.mOuterOffsetX + pageTurnCorner.x;
dy=this.mOuterOffsetY + pageTurnCorner.y;
ex=(dx+bx)/2;
ey=(dy+by)/2;
this.mForegroundPath.moveTo(innerOffsetX + x1, innerOffsetY + y1);
this.mForegroundPath.lineTo(innerOffsetX + pageTurnCorner.x, innerOffsetY + oppositeCorner.y);
this.mForegroundPath.lineTo(innerOffsetX + oppositeCorner.x, innerOffsetY + oppositeCorner.y);
this.mForegroundPath.lineTo(innerOffsetX + oppositeCorner.x, innerOffsetY + pageTurnCorner.y);
this.mForegroundPath.lineTo(innerOffsetX + x0, innerOffsetY + pageTurnCorner.y);
this.mForegroundPath.lineTo(innerOffsetX + x2, innerOffsetY + y2);
// this.mForegroundPath.quadTo(ex, ey, bx, by);
this.mForegroundPath.lineTo(innerOffsetX + x1, innerOffsetY + y1);
this.mBackPagePath.moveTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);
this.mBackPagePath.lineTo(this.mOuterOffsetX + x2, this.mOuterOffsetY + y2);
//b到c的那条线，可以考虑画个弧线
this.mBackPagePath.lineTo(this.mOuterOffsetX + x0, this.mOuterOffsetY + pageTurnCorner.y);
// this.mBackPagePath.arcTo(new RectF(bx,by,cx,cy), 220, 180,false);
// this.mBackPagePath.quadTo(ex, ey, cx, cy);
// this.mBackPagePath.cubicTo(100, -50, 200, 50, cx, cy);//贝赛尔曲线
this.mBackPagePath.lineTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);
this.mBackgroundPath.moveTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);
this.mBackgroundPath.lineTo(this.mOuterOffsetX + x0, this.mOuterOffsetY + pageTurnCorner.y);
this.mBackgroundPath.lineTo(this.mOuterOffsetX + pageTurnCorner.x, this.mOuterOffsetY + pageTurnCorner.y);
this.mBackgroundPath.lineTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);
return page_slope;
}
private float secondHalfPageTurn(PointF pageDim, PointF pageTurnCorner, PointF oppositeCorner, float xPivot, float slope, float y) {
float width = pageDim.x;
float height = pageDim.y;
View child = this.mPage.getChildAt(0);
int xOffset = child.getLeft() - this.mPage.getLeft();
int yOffset = child.getTop() - this.mPage.getTop();
float y1 = 0.0F;
float x1 = width - (height + width) * (width - this.mPivotX) / width;
float x3 = (float)(2.0D * y / (slope + 1.0D / slope));
float y3 = height + x3 / slope;
float page_slope = (height - y3) / (x3 - this.mPivotX);
float b = height - x1 * page_slope;
float x2 = (float)((-y - b) / (page_slope + 1.0D / page_slope));
float y2 = (x1 - x2) * page_slope;
if ((this.mCorner & 0x1) != 0) {
x1 = width - x1;
x2 = width - x2;
x3 = width - x3;
page_slope = -page_slope;
}
if ((this.mCorner & 0x2) != 0) {
y1 = height - y1;
y2 = height - y2;
y3 = height - y3;
page_slope = -page_slope;
}
float x0 = xPivot;
this.mForegroundPath.moveTo(xOffset + x1, yOffset + y1);
this.mForegroundPath.lineTo(xOffset + oppositeCorner.x, yOffset + oppositeCorner.y);
this.mForegroundPath.lineTo(xOffset + oppositeCorner.x, yOffset + pageTurnCorner.y);
this.mForegroundPath.lineTo(xOffset + x0, yOffset + pageTurnCorner.y);
this.mForegroundPath.lineTo(xOffset + x1, yOffset + y1);
//a点是右上角，c0点位左上角，b点为左下角，d点为固定的右下角
ax=this.mOuterOffsetX + x1;
ay=this.mOuterOffsetY + y1;
c0x=this.mOuterOffsetX + x2;
c0y=this.mOuterOffsetY + y2;
bx=this.mOuterOffsetX + x3;
by=this.mOuterOffsetY + y3;
cx=this.mOuterOffsetX + x0;
cy=this.mOuterOffsetY + pageTurnCorner.y;
dx=this.mOuterOffsetX + pageTurnCorner.x;
dy=this.mOuterOffsetY + pageTurnCorner.y;
ex=(dx+bx)/2;
ey=(dy+by)/2;
this.mBackPagePath.moveTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);
this.mBackPagePath.lineTo(this.mOuterOffsetX + x2, this.mOuterOffsetY + y2);
this.mBackPagePath.lineTo(this.mOuterOffsetX + x3, this.mOuterOffsetY + y3);
this.mBackPagePath.lineTo(this.mOuterOffsetX + x0, this.mOuterOffsetY + pageTurnCorner.y);
// this.mBackPagePath.quadTo(ex, ey, cx, cy);
this.mBackPagePath.lineTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);
this.mBackgroundPath.moveTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);
this.mBackgroundPath.lineTo(this.mOuterOffsetX + x0, this.mOuterOffsetY + pageTurnCorner.y);
this.mBackgroundPath.lineTo(this.mOuterOffsetX + pageTurnCorner.x, this.mOuterOffsetY + pageTurnCorner.y);
this.mBackgroundPath.lineTo(this.mOuterOffsetX + pageTurnCorner.x, this.mOuterOffsetY + oppositeCorner.y);
this.mBackgroundPath.lineTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);
return page_slope;
}
private void drawBackground(Canvas canvas) {
canvas.save();
// canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG));
canvas.clipPath(this.mBackgroundPath, Region.Op.INTERSECT);
canvas.translate(this.mOuterOffsetX, this.mOuterOffsetY);
if (this.mPageBackground != null) {
this.mPageBackground.setBounds(0, 0, this.mChildRect.right, this.mChildRect.bottom);
this.mPageBackground.draw(canvas);
}
if (this.mPage != null) {
this.mPage.drawBackground(canvas);
}
// add drop shadow start test
if(mTimeStep<=29&&ex>2){
LinearGradient grad = new LinearGradient(
ex,ey,ex+(dx-ex)/4,ey+(dy-ey)/4,R.color.gray3,Color.TRANSPARENT,Shader.TileMode.CLAMP);
Paint p=new Paint();
p.setShader(grad);
// p.setAlpha(120);
canvas.drawPath(this.mBackgroundPath,p);
//end test
}
canvas.restore();
}
private void drawBackPage(Canvas canvas) {
float width = this.mChildRect.right;
float height = this.mChildRect.bottom;
canvas.save();
// canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG));
canvas.clipPath(this.mBackPagePath, Region.Op.INTERSECT);
float xShift = 2.0F * this.mPivotX - width;
float xRotate = width - this.mPivotX;
float yRotate = height;
if ((this.mCorner & 0x1) != 0) {
xShift = width - 2.0F * this.mPivotX;
xRotate = this.mPivotX;
}
if ((this.mCorner & 0x2) != 0) {
yRotate = 0.0F;
}
canvas.translate(this.mOuterOffsetX + xShift, this.mOuterOffsetY);
canvas.rotate(this.mRotation, xRotate, yRotate);
//画原本的背面
if (this.mBackPage != null) {
this.mBackPage.setBounds(0, 0, this.mChildRect.right, this.mChildRect.bottom);
this.mBackPage.draw(canvas);
}
//画回调函数中的画背面
if (this.mPage != null) {
Log.v("log2 drawBackPage2:", "drawing back page");
this.mPage.drawBackPage(canvas);
}
canvas.restore();
canvas.save();
// canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG));
// int[] colors={Color.BLACK,Color.GRAY,Color.BLACK};
// LinearGradient grad = new LinearGradient(
// ex,ey,bx,by,colors,null,Shader.TileMode.CLAMP);
// Paint p=new Paint();
// p.setShader(grad);
// p.setAlpha(120);
// canvas.drawPath(this.mBackPagePath,p);
LinearGradient grad = new LinearGradient(
ex,ey,ex-(ex-bx)/4,ey-(ey-by)/4,R.color.gray3,0xC9C9C9,Shader.TileMode.CLAMP);
Paint p=new Paint();
p.setShader(grad);
// p.setAlpha(120);
canvas.drawPath(this.mBackPagePath,p);
canvas.restore();
//中间阴影问题，起点蓝色-》 白色-》 蓝色终点，这样起点前和终点后的区域也为蓝色了。
canvas.save();
// canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG));
LinearGradient grad1 = new LinearGradient(
ex-(ex-bx)/4,ey-(ey-by)/4,bx,by,0xC9C9C9,R.color.gray3,Shader.TileMode.CLAMP);
Paint p1=new Paint();
p1.setShader(grad1);
// p1.setAlpha(120);
canvas.drawPath(this.mBackPagePath,p1);
canvas.restore();
//
}
public int getmTimeStep(){
return mTimeStep;
}
public void setmTimeStep(int mTimeStep ){
this.mTimeStep= mTimeStep;
}
public boolean getmStepping(){
return mStepping;
}
public void setmStepping(boolean mStepping ){
this.mStepping= mStepping;
}
public void setmStepLen(int mStepLen){
this.mStepLen=mStepLen;
}
public int getmStepLen(){
return this.mStepLen;
}
public void setmMaxStep(int mMaxStep){
this.mMaxStep=mMaxStep;
}
public int getmMaxStep(){
return this.mMaxStep;
}
public void setPreStart(int where)
{
switch (where)
{
case NEXT:
case LAST:
mWhere = where;
break;
default:
mWhere = KEEP;
break;
}
isBgInit = true;
isBackInit = true;
}
}
第二个view类pageView.java：
public class PageViewP1 extends RelativeLayout {
public static final int CORNER_BOTTOM_LEFT = 0;
public static final int CORNER_BOTTOM_RIGHT = 1;
public static final int CORNER_TOP_LEFT = 2;
public static final int CORNER_TOP_RIGHT = 3;
private Path mClipPath;
private PageTurnerViewP1 mPageTurner;
private Callback mCallback;
private int mCorner;
private Drawable mBackPage;
private Drawable mPageBackground;
public PageViewP1(Context context) {
super(context);
}
public PageViewP1(Context context, AttributeSet attrs ) {
super(context, attrs );
this.mBackPage =this.getBackground();
this.mCorner = -1;
}
void setPageTurner(PageTurnerViewP1 pageTurnerViewP1) {
this.mPageTurner = pageTurnerViewP1;
}
void setClipPath(Path clipPath) {
this.mClipPath = clipPath;
}
public void setCallback(Callback callback) {
this.mCallback = callback;
}
void drawBackPage(Canvas canvas) {
if (this.mCallback != null)
this.mCallback.onDrawBackPage(canvas);
}
void drawBackground(Canvas canvas) {
if (this.mCallback != null)
this.mCallback.onDrawBackground(canvas);
}
public void startPageTurn() {
if (this.mPageTurner != null)
this.mPageTurner.startPageTurn(0);
}
void onPageTurnFinished(Canvas canvas) {
this.mCallback.onPageTurnFinished(canvas);
this.mClipPath = null;
}
protected void dispatchDraw(Canvas canvas) {
if (this.mClipPath != null) {
canvas.save();
canvas.clipPath(this.mClipPath, Region.Op.INTERSECT);
}
super.dispatchDraw(canvas);
if (this.mClipPath != null)
canvas.restore();
}
public void setCorner(int corner) {
this.mCorner = corner;
}
public int getCorner() {
return this.mCorner;
}
public void setBackPage(Drawable backPage) {
this.mBackPage = backPage;
}
public Drawable getBackPage() {
return this.mBackPage;
}
public void setPageBackground(Drawable background) {
this.mPageBackground = background;
}
public Drawable getPageBackground() {
return this.mPageBackground;
}
public static abstract class Callback {
public void onDrawBackPage(Canvas canvas) {
Log.v("Callback", "drawing back page");
}
public void onDrawBackground(Canvas canvas) {
Log.v("Callback2", "drawing back page");
}
public void onPageTurnFinished(Canvas canvas) {
Log.v("Callback3", "drawing back page");
}
}
}
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