电子书翻书效果（源代码）

package com.xin.book.view; import java.util.Date; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PaintFlagsDrawFilter; import android.graphics.Path; import android.graphics.Point; import android.graphics.Shader; import android.os.Handler; import android.util.AttributeSet; import android.util.Log; import android.view.GestureDetector; import android.view.GestureDetector.OnGestureListener; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.FrameLayout; import android.widget.LinearLayout; public class BookLayout extends FrameLayout { public static final String LOG_TAG = "liaowenxin"; private int totalPageNum; private Context mContext; private boolean hasInit = false; private final int defaultWidth = 600, defaultHeight = 400; private int contentWidth = 0; private int contentHeight = 0; private View currentPage, middlePage, nextPage, prevPage; private LinearLayout invisibleLayout; private LinearLayout mainLayout; private BookView mBookView; private Handler aniEndHandle; private static boolean closeBook = false; private Corner mSelectCorner; private final int clickCornerLen = 250 * 250; // 50dip private float scrollX = 0, scrollY = 0; private int indexPage = 0; private BookState mState; private Point aniStartPos; private Point aniStopPos; private Date aniStartTime; private long aniTime = 800; private long timeOffset = 10; // private Listener mListener; private BookAdapter mPageAdapter; private GestureDetector mGestureDetector; private BookOnGestureListener mGestureListener; public BookLayout(Context context) { super(context); Init(context); } public BookLayout(Context context, AttributeSet attrs) { super(context,attrs); Init(context); } public BookLayout(Context context, AttributeSet attrs, int defStyle) { super(context,attrs,defStyle); Init(context); } public void setPageAdapter(BookAdapter pa) { Log.d(LOG_TAG, "setPageAdapter"); mPageAdapter = pa; } public void Init(Context context) { Log.d(LOG_TAG, "Init"); totalPageNum = 0; mContext = context; mSelectCorner = Corner.None; mGestureListener = new BookOnGestureListener(); mGestureDetector = new GestureDetector(mGestureListener); mGestureDetector.setIsLongpressEnabled(false); aniEndHandle = new Handler(); this.setOnTouchListener(touchListener); this.setLongClickable(true); } protected void dispatchDraw(Canvas canvas) { Log.d(LOG_TAG, "dispatchDraw"); super.dispatchDraw(canvas); if (!hasInit) { hasInit = true; indexPage = 0; if (mPageAdapter == null) { throw new RuntimeException("please set the PageAdapter on init"); } totalPageNum = mPageAdapter.getCount(); mainLayout = new LinearLayout(mContext); mainLayout.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); mainLayout.setBackgroundColor(0xffffffff); mState = BookState.READY; invisibleLayout = new LinearLayout(mContext); invisibleLayout.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); this.addView(invisibleLayout); this.addView(mainLayout); mBookView = new BookView(mContext); mBookView.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); this.addView(mBookView); updatePageView(); invalidate(); } else if (mState == BookState.READY) { mBookView.update(); } } /** * 此方法做过修改，改成一页显示 */ public void updatePageView() { Log.d(LOG_TAG, "updatePageView"); if (indexPage < 0 || indexPage > totalPageNum - 1) { return; } invisibleLayout.removeAllViews(); mainLayout.removeAllViews(); /* 当前页 */ currentPage = mPageAdapter.getView(indexPage); if (currentPage == null) { currentPage = new WhiteView(mContext); } currentPage.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); mainLayout.addView(currentPage); /* 背景页 */ middlePage = new WhiteView(mContext); middlePage.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); invisibleLayout.addView(middlePage); /* 前一页 */ prevPage = null; if (indexPage > 0) { prevPage = mPageAdapter.getView(indexPage - 1); } if (prevPage == null) { prevPage = new WhiteView(mContext); } prevPage.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); invisibleLayout.addView(prevPage); /* 后一页 */ nextPage = null; if (indexPage < totalPageNum - 1) { nextPage = mPageAdapter.getView(indexPage + 1); } if (nextPage == null) { nextPage = new WhiteView(mContext); } nextPage.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); invisibleLayout.addView(nextPage); Log.d(LOG_TAG, "updatePageView finish"); } OnTouchListener touchListener = new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { Log.d(LOG_TAG, "onTouch " + " x: " + event.getX() + " y: " + event.getY() + " mState:" + mState); mGestureDetector.onTouchEvent(event); int action = event.getAction(); if (action == MotionEvent.ACTION_UP && mSelectCorner != Corner.None && mState == BookState.TRACKING) { if (mState == BookState.ANIMATING) return false; if (mSelectCorner == Corner.LeftTop) { if (scrollX < contentWidth / 2) { aniStopPos = new Point(0, 0); } else { aniStopPos = new Point(2 * contentWidth, 0); } } else if (mSelectCorner == Corner.RightTop) { if (scrollX < contentWidth / 2) { aniStopPos = new Point(-contentWidth, 0); } else { aniStopPos = new Point(contentWidth, 0); } } else if (mSelectCorner == Corner.LeftBottom) { if (scrollX < contentWidth / 2) { aniStopPos = new Point(0, contentHeight); } else { aniStopPos = new Point(2 * contentWidth, contentHeight); } } else if (mSelectCorner == Corner.RightBottom) { if (scrollX < contentWidth / 2) { aniStopPos = new Point(-contentWidth, contentHeight); } else