android 翻页卷曲效果 电子书翻页
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转载请注明来自： 5进制空间-android区
希望阅读电子书的用户都会对翻页动画功能有使用需求；如果觉得仅靠点击或滑动来实现翻页效果不够理想，则这篇文章或许能为你提供有效的解决方案。
先上个效果图：
成效依然十分显著，
不过相比起ibook的效果，
还是存在一定的差距。
道理上讲，
这种方法没有采用OpenGL来进行3D图形渲染，
而是采用了二维canvas绘制视图的方式，
并增加了阴影效果，
这使得整体呈现仍然具有很强的空间感。
同样运行得非常顺畅，
显然使用OpenGL实现后会呈现出更好的效果，
然而就我目前的技术水平而言，
实现的可能性仍然显得力不从心。
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); 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 { // 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.mTimeStepthis.mMaxStep)) {
if ( (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 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();
//
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");
}
}
}转载请注明来自： 5进制空间-android区
如果想深入了解这两个XML view组件的使用方法的话, 建议访问该网页获取pageDemo.java文件, 并仔细阅读以更好地理解其功能及实现细节.
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