安卓阅读及翻页效果的实现

MrLee2014-11-28 1592

0_1319103775TYht


程序源码
package com.book.lee;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.os.Bundle;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;
public class BookActivity extends Activity {
	/** Called when the activity is first created. */
	private PageWidget mPageWidget;
	private Bitmap mCurPageBitmap, mNextPageBitmap;
	private Canvas mCurPageCanvas, mNextPageCanvas;
	private BookPageFactory pagefactory;
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
				WindowManager.LayoutParams.FLAG_FULLSCREEN);
		Display display = getWindowManager().getDefaultDisplay();
		int w = display.getWidth();
		int h = display.getHeight();
		System.out.println(w + "\t" + h);
		mCurPageBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
		mNextPageBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
		mCurPageCanvas = new Canvas(mCurPageBitmap);
		mNextPageCanvas = new Canvas(mNextPageBitmap);
		pagefactory = new BookPageFactory(w, h);
		pagefactory.setBgBitmap(BitmapFactory.decodeResource(getResources(),
				R.drawable.bg));
		if (!copyFile()) {
			Toast.makeText(this, "电子书不存在!", Toast.LENGTH_SHORT).show();
		} else {
			pagefactory.openbook("/sdcard/test.txt");
			pagefactory.onDraw(mCurPageCanvas);
		}
		mPageWidget = new PageWidget(this, w, h);
		setContentView(mPageWidget);
		mPageWidget.setBitmaps(mCurPageBitmap, mCurPageBitmap);
		mPageWidget.setOnTouchListener(new OnTouchListener() {
			@Override
			public boolean onTouch(View v, MotionEvent e) {
				// TODO Auto-generated method stub
				boolean ret = false;
				if (v == mPageWidget) {
					if (e.getAction() == MotionEvent.ACTION_DOWN) {
						mPageWidget.abortAnimation();
						mPageWidget.calcCornerXY(e.getX(), e.getY());
						pagefactory.onDraw(mCurPageCanvas);
						if (mPageWidget.DragToRight()) {
							try {
								pagefactory.prePage();
							} catch (IOException e1) {
								// TODO Auto-generated catch block
								e1.printStackTrace();
							}
							if (pagefactory.isfirstPage())
								return false;
							pagefactory.onDraw(mNextPageCanvas);
						} else {
							try {
								pagefactory.nextPage();
							} catch (IOException e1) {
								// TODO Auto-generated catch block
								e1.printStackTrace();
							}
							if (pagefactory.islastPage())
								return false;
							pagefactory.onDraw(mNextPageCanvas);
						}
						mPageWidget.setBitmaps(mCurPageBitmap, mNextPageBitmap);
					}
					ret = mPageWidget.doTouchEvent(e);
					return ret;
				}
				return false;
			}
		});
	}
	protected boolean copyFile() {
		try {
			String dst = "/sdcard/test.txt";
			File outFile = new File(dst);
			if (!outFile.exists()) {
				InputStream inStream = getResources().openRawResource(
						R.raw.test);
				outFile.createNewFile();
				FileOutputStream fs = new FileOutputStream(outFile);
				byte[] buffer = new byte[1024 * 1024];// 1MB
				int byteread = 0;
				while ((byteread = inStream.read(buffer)) != -1) {
					fs.write(buffer, 0, byteread);
				}
				inStream.close();
				fs.close();
			}
			return true;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return false;
	}
}

加载源码
/**
 *  Author :  hmg25
 *  Description :
 */
package com.book.lee;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.text.DecimalFormat;
import java.util.Vector;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
public class BookPageFactory {
	private File book_file = null;
	private MappedByteBuffer m_mbBuf = null;
	private int m_mbBufLen = 0;
	private int m_mbBufBegin = 0;
	private int m_mbBufEnd = 0;
	private String m_strCharsetName = "GBK";
	private Bitmap m_book_bg = null;
	private int mWidth;
	private int mHeight;
	private Vector m_lines = new Vector();
	private int m_fontSize = 24;
	private int m_textColor = Color.BLACK;
	private int m_backColor = 0xffff9e85; // 背景颜色
	private int marginWidth = 15; // 左右与边缘的距离
	private int marginHeight = 20; // 上下与边缘的距离
	private int mLineCount; // 每页可以显示的行数
	private float mVisibleHeight; // 绘制内容的宽
	private float mVisibleWidth; // 绘制内容的宽
	private boolean m_isfirstPage, m_islastPage;
	// private int m_nLineSpaceing = 5;
	private Paint mPaint;
	public BookPageFactory(int w, int h) {
		// TODO Auto-generated constructor stub
		mWidth = w;
		mHeight = h;
		mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		mPaint.setTextAlign(Align.LEFT);
		mPaint.setTextSize(m_fontSize);
		mPaint.setColor(m_textColor);
		mVisibleWidth = mWidth - marginWidth * 2;
		mVisibleHeight = mHeight - marginHeight * 2;
		mLineCount = (int) (mVisibleHeight / m_fontSize); // 可显示的行数
	}
	public void openbook(String strFilePath) {
		try {
			book_file = new File(strFilePath);
			long lLen = book_file.length();
			m_mbBufLen = (int) lLen;
			m_mbBuf = new RandomAccessFile(book_file, "r").getChannel().map(
					FileChannel.MapMode.READ_ONLY, 0, lLen);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	protected byte[] readParagraphBack(int nFromPos) {
		int nEnd = nFromPos;
		int i;
		byte b0, b1;
		if (m_strCharsetName.equals("UTF-16LE")) {
			i = nEnd - 2;
			while (i > 0) {
				b0 = m_mbBuf.get(i);
				b1 = m_mbBuf.get(i + 1);
				if (b0 == 0x0a && b1 == 0x00 && i != nEnd - 2) {
					i += 2;
					break;
				}
				i--;
			}
		} else if (m_strCharsetName.equals("UTF-16BE")) {
			i = nEnd - 2;
			while (i > 0) {
				b0 = m_mbBuf.get(i);
				b1 = m_mbBuf.get(i + 1);
				if (b0 == 0x00 && b1 == 0x0a && i != nEnd - 2) {
					i += 2;
					break;
				}
				i--;
			}
		} else {
			i = nEnd - 1;
			while (i > 0) {
				b0 = m_mbBuf.get(i);
				if (b0 == 0x0a && i != nEnd - 1) {
					i++;
					break;
				}
				i--;
			}
		}
		if (i < 0)
			i = 0;
		int nParaSize = nEnd - i;
		int j;
		byte[] buf = new byte[nParaSize];
		for (j = 0; j < nParaSize; j++) {
			buf[j] = m_mbBuf.get(i + j);
		}
		return buf;
	}
	// 读取上一段落
	protected byte[] readParagraphForward(int nFromPos) {
		int nStart = nFromPos;
		int i = nStart;
		byte b0, b1;
		// 根据编码格式判断换行
		if (m_strCharsetName.equals("UTF-16LE")) {
			while (i < m_mbBufLen - 1) {
				b0 = m_mbBuf.get(i++);
				b1 = m_mbBuf.get(i++);
				if (b0 == 0x0a && b1 == 0x00) {
					break;
				}
			}
		} else if (m_strCharsetName.equals("UTF-16BE")) {
			while (i < m_mbBufLen - 1) {
				b0 = m_mbBuf.get(i++);
				b1 = m_mbBuf.get(i++);
				if (b0 == 0x00 && b1 == 0x0a) {
					break;
				}
			}
		} else {
			while (i < m_mbBufLen) {
				b0 = m_mbBuf.get(i++);
				if (b0 == 0x0a) {
					break;
				}
			}
		}
		int nParaSize = i - nStart;
		byte[] buf = new byte[nParaSize];
		for (i = 0; i < nParaSize; i++) {
			buf[i] = m_mbBuf.get(nFromPos + i);
		}
		return buf;
	}
	protected Vector pageDown() {
		String strParagraph = "";
		Vector lines = new Vector();
		while (lines.size() < mLineCount && m_mbBufEnd < m_mbBufLen) {
			byte[] paraBuf = readParagraphForward(m_mbBufEnd); // 读取一个段落
			m_mbBufEnd += paraBuf.length;
			try {
				strParagraph = new String(paraBuf, m_strCharsetName);
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			String strReturn = "";
			if (strParagraph.indexOf("\r\n") != -1) {
				strReturn = "\r\n";
				strParagraph = strParagraph.replaceAll("\r\n", "");
			} else if (strParagraph.indexOf("\n") != -1) {
				strReturn = "\n";
				strParagraph = strParagraph.replaceAll("\n", "");
			}
			if (strParagraph.length() == 0) {
				lines.add(strParagraph);
			}
			while (strParagraph.length() > 0) {
				int nSize = mPaint.breakText(strParagraph, true, mVisibleWidth,
						null);
				lines.add(strParagraph.substring(0, nSize));
				strParagraph = strParagraph.substring(nSize);
				if (lines.size() >= mLineCount) {
					break;
				}
			}
			if (strParagraph.length() != 0) {
				try {
					m_mbBufEnd -= (strParagraph + strReturn)
							.getBytes(m_strCharsetName).length;
				} catch (UnsupportedEncodingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		return lines;
	}
	protected void pageUp() {
		if (m_mbBufBegin < 0)
			m_mbBufBegin = 0;
		Vector lines = new Vector();
		String strParagraph = "";
		while (lines.size() < mLineCount && m_mbBufBegin > 0) {
			Vector paraLines = new Vector();
			byte[] paraBuf = readParagraphBack(m_mbBufBegin);
			m_mbBufBegin -= paraBuf.length;
			try {
				strParagraph = new String(paraBuf, m_strCharsetName);
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			strParagraph = strParagraph.replaceAll("\r\n", "");
			strParagraph = strParagraph.replaceAll("\n", "");
			if (strParagraph.length() == 0) {
				paraLines.add(strParagraph);
			}
			while (strParagraph.length() > 0) {
				int nSize = mPaint.breakText(strParagraph, true, mVisibleWidth,
						null);
				paraLines.add(strParagraph.substring(0, nSize));
				strParagraph = strParagraph.substring(nSize);
			}
			lines.addAll(0, paraLines);
		}
		while (lines.size() > mLineCount) {
			try {
				m_mbBufBegin += lines.get(0).getBytes(m_strCharsetName).length;
				lines.remove(0);
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		m_mbBufEnd = m_mbBufBegin;
		return;
	}
	protected void prePage() throws IOException {
		if (m_mbBufBegin <= 0) {
			m_mbBufBegin = 0;
			m_isfirstPage = true;
			return;
		} else
			m_isfirstPage = false;
		m_lines.clear();
		pageUp();
		m_lines = pageDown();
	}
	public void nextPage() throws IOException {
		if (m_mbBufEnd >= m_mbBufLen) {
			m_islastPage = true;
			return;
		} else
			m_islastPage = false;
		m_lines.clear();
		m_mbBufBegin = m_mbBufEnd;
		m_lines = pageDown();
	}
	public void onDraw(Canvas c) {
		if (m_lines.size() == 0)
			m_lines = pageDown();
		if (m_lines.size() > 0) {
			if (m_book_bg == null)
				c.drawColor(m_backColor);
			else
				c.drawBitmap(m_book_bg, 0, 0, null);
			int y = marginHeight;
			for (String strLine : m_lines) {
				y += m_fontSize;
				c.drawText(strLine, marginWidth, y, mPaint);
			}
		}
		float fPercent = (float) (m_mbBufBegin * 1.0 / m_mbBufLen);
		DecimalFormat df = new DecimalFormat("#0.0");
		String strPercent = df.format(fPercent * 100) + "%";
		int nPercentWidth = (int) mPaint.measureText("999.9%") + 1;
		c.drawText(strPercent, mWidth - nPercentWidth, mHeight - 5, mPaint);
	}
	public void setBgBitmap(Bitmap BG) {
		if (BG.getWidth() != mWidth || BG.getHeight() != mHeight)
			m_book_bg = Bitmap.createScaledBitmap(BG, mWidth, mHeight, true);
		else
			m_book_bg = BG;
	}
	public boolean isfirstPage() {
		return m_isfirstPage;
	}
	public boolean islastPage() {
		return m_islastPage;
	}
}

显示效果源码
package com.book.lee;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PointF;
import android.graphics.Region;
import android.graphics.drawable.GradientDrawable;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Scroller;
public class PageWidget extends View {
	private int mWidth;
	private int mHeight;
	private int mCornerX = 0; // 拖拽点对应的页脚
	private int mCornerY = 0;
	private Path mPath0;
	private Path mPath1;
	Bitmap mCurPageBitmap = null; // 当前页
	Bitmap mNextPageBitmap = null;
	PointF mTouch = new PointF(); // 拖拽点
	PointF mBezierStart1 = new PointF(); // 贝塞尔曲线起始点
	PointF mBezierControl1 = new PointF(); // 贝塞尔曲线控制点
	PointF mBeziervertex1 = new PointF(); // 贝塞尔曲线顶点
	PointF mBezierEnd1 = new PointF(); // 贝塞尔曲线结束点
	PointF mBezierStart2 = new PointF(); // 另一条贝塞尔曲线
	PointF mBezierControl2 = new PointF();
	PointF mBeziervertex2 = new PointF();
	PointF mBezierEnd2 = new PointF();
	float mMiddleX;
	float mMiddleY;
	float mDegrees;
	float mTouchToCornerDis;
	ColorMatrixColorFilter mColorMatrixFilter;
	Matrix mMatrix;
	float[] mMatrixArray = { 0, 0, 0, 0, 0, 0, 0, 0, 1.0f };
	boolean mIsRTandLB; // 是否属于右上左下
	float mMaxLength = (float) Math.hypot(mWidth, mHeight);
	int[] mBackShadowColors;
	int[] mFrontShadowColors;
	GradientDrawable mBackShadowDrawableLR;
	GradientDrawable mBackShadowDrawableRL;
	GradientDrawable mFolderShadowDrawableLR;
	GradientDrawable mFolderShadowDrawableRL;
	GradientDrawable mFrontShadowDrawableHBT;
	GradientDrawable mFrontShadowDrawableHTB;
	GradientDrawable mFrontShadowDrawableVLR;
	GradientDrawable mFrontShadowDrawableVRL;
	Paint mPaint;
	Scroller mScroller;
	public PageWidget(Context context, int w, int h) {
		super(context);
		// TODO Auto-generated constructor stub
		mWidth = w;
		mHeight = h;
		mPath0 = new Path();
		mPath1 = new Path();
		createDrawable();
		mPaint = new Paint();
		mPaint.setStyle(Paint.Style.FILL);
		ColorMatrix cm = new ColorMatrix();
		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 };
		cm.set(array);
		mColorMatrixFilter = new ColorMatrixColorFilter(cm);
		mMatrix = new Matrix();
		mScroller = new Scroller(getContext());
		mTouch.x = 0.01f; // 不让x,y为0,否则在点计算时会有问题
		mTouch.y = 0.01f;
	}
	/**
	 * Author : hmg25 Version: 1.0 Description : 计算拖拽点对应的拖拽脚
	 */
	public void calcCornerXY(float x, float y) {
		if (x <= mWidth / 2)
			mCornerX = 0;
		else
			mCornerX = mWidth;
		if (y <= mHeight / 2)
			mCornerY = 0;
		else
			mCornerY = mHeight;
		if ((mCornerX == 0 && mCornerY == mHeight)
				|| (mCornerX == mWidth && mCornerY == 0))
			mIsRTandLB = true;
		else
			mIsRTandLB = false;
	}
	public boolean doTouchEvent(MotionEvent event) {
		// TODO Auto-generated method stub
		if (event.getAction() == MotionEvent.ACTION_MOVE) {
			mTouch.x = event.getX();
			mTouch.y = event.getY();
			this.postInvalidate();
		}
		if (event.getAction() == MotionEvent.ACTION_DOWN) {
			mTouch.x = event.getX();
			mTouch.y = event.getY();
			// calcCornerXY(mTouch.x, mTouch.y);
			// this.postInvalidate();
		}
		if (event.getAction() == MotionEvent.ACTION_UP) {
			if (canDragOver()) {
				startAnimation(1200);
			} else {
				mTouch.x = mCornerX - 0.09f;
				mTouch.y = mCornerY - 0.09f;
			}
			this.postInvalidate();
		}
		// return super.onTouchEvent(event);
		return true;
	}
	/**
	 * Author : hmg25 Version: 1.0 Description : 求解直线P1P2和直线P3P4的交点坐标
	 */
	public PointF getCross(PointF P1, PointF P2, PointF P3, PointF P4) {
		PointF CrossP = new PointF();
		// 二元函数通式: y=ax+b
		float a1 = (P2.y - P1.y) / (P2.x - P1.x);
		float b1 = ((P1.x * P2.y) - (P2.x * P1.y)) / (P1.x - P2.x);
		float a2 = (P4.y - P3.y) / (P4.x - P3.x);
		float b2 = ((P3.x * P4.y) - (P4.x * P3.y)) / (P3.x - P4.x);
		CrossP.x = (b2 - b1) / (a1 - a2);
		CrossP.y = a1 * CrossP.x + b1;
		return CrossP;
	}
	private void calcPoints() {
		mMiddleX = (mTouch.x + mCornerX) / 2;
		mMiddleY = (mTouch.y + mCornerY) / 2;
		mBezierControl1.x = mMiddleX - (mCornerY - mMiddleY)
				* (mCornerY - mMiddleY) / (mCornerX - mMiddleX);
		mBezierControl1.y = mCornerY;
		mBezierControl2.x = mCornerX;
		mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX)
				* (mCornerX - mMiddleX) / (mCornerY - mMiddleY);
		// Log.i("hmg", "mTouchX  " + mTouch.x + "  mTouchY  " + mTouch.y);
		// Log.i("hmg", "mBezierControl1.x  " + mBezierControl1.x
		// + "  mBezierControl1.y  " + mBezierControl1.y);
		// Log.i("hmg", "mBezierControl2.x  " + mBezierControl2.x
		// + "  mBezierControl2.y  " + mBezierControl2.y);
		mBezierStart1.x = mBezierControl1.x - (mCornerX - mBezierControl1.x)
				/ 2;
		mBezierStart1.y = mCornerY;
		// 当mBezierStart1.x < 0或者mBezierStart1.x > 480时
		// 如果继续翻页,会出现BUG故在此限制
		if (mTouch.x > 0 && mTouch.x < mWidth) {
			if (mBezierStart1.x < 0 || mBezierStart1.x > mWidth) {
				if (mBezierStart1.x < 0)
					mBezierStart1.x = mWidth - mBezierStart1.x;
				float f1 = Math.abs(mCornerX - mTouch.x);
				float f2 = mWidth * f1 / mBezierStart1.x;
				mTouch.x = Math.abs(mCornerX - f2);
				float f3 = Math.abs(mCornerX - mTouch.x)
						* Math.abs(mCornerY - mTouch.y) / f1;
				mTouch.y = Math.abs(mCornerY - f3);
				mMiddleX = (mTouch.x + mCornerX) / 2;
				mMiddleY = (mTouch.y + mCornerY) / 2;
				mBezierControl1.x = mMiddleX - (mCornerY - mMiddleY)
						* (mCornerY - mMiddleY) / (mCornerX - mMiddleX);
				mBezierControl1.y = mCornerY;
				mBezierControl2.x = mCornerX;
				mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX)
						* (mCornerX - mMiddleX) / (mCornerY - mMiddleY);
				// Log.i("hmg", "mTouchX --> " + mTouch.x + "  mTouchY-->  "
				// + mTouch.y);
				// Log.i("hmg", "mBezierControl1.x--  " + mBezierControl1.x
				// + "  mBezierControl1.y -- " + mBezierControl1.y);
				// Log.i("hmg", "mBezierControl2.x -- " + mBezierControl2.x
				// + "  mBezierControl2.y -- " + mBezierControl2.y);
				mBezierStart1.x = mBezierControl1.x
						- (mCornerX - mBezierControl1.x) / 2;
			}
		}
		mBezierStart2.x = mCornerX;
		mBezierStart2.y = mBezierControl2.y - (mCornerY - mBezierControl2.y)
				/ 2;
		mTouchToCornerDis = (float) Math.hypot((mTouch.x - mCornerX),
				(mTouch.y - mCornerY));
		mBezierEnd1 = getCross(mTouch, mBezierControl1, mBezierStart1,
				mBezierStart2);
		mBezierEnd2 = getCross(mTouch, mBezierControl2, mBezierStart1,
				mBezierStart2);
		// Log.i("hmg", "mBezierEnd1.x  " + mBezierEnd1.x + "  mBezierEnd1.y  "
		// + mBezierEnd1.y);
		// Log.i("hmg", "mBezierEnd2.x  " + mBezierEnd2.x + "  mBezierEnd2.y  "
		// + mBezierEnd2.y);
		/**
		 * mBeziervertex1.x 推导
		 * ((mBezierStart1.x+mBezierEnd1.x)/2+mBezierControl1.x)/2 化简等价于
		 * (mBezierStart1.x+ 2*mBezierControl1.x+mBezierEnd1.x) / 4
		 */
		mBeziervertex1.x = (mBezierStart1.x + 2 * mBezierControl1.x + mBezierEnd1.x) / 4;
		mBeziervertex1.y = (2 * mBezierControl1.y + mBezierStart1.y + mBezierEnd1.y) / 4;
		mBeziervertex2.x = (mBezierStart2.x + 2 * mBezierControl2.x + mBezierEnd2.x) / 4;
		mBeziervertex2.y = (2 * mBezierControl2.y + mBezierStart2.y + mBezierEnd2.y) / 4;
	}
	private void drawCurrentPageArea(Canvas canvas, Bitmap bitmap, Path path) {
		mPath0.reset();
		mPath0.moveTo(mBezierStart1.x, mBezierStart1.y);
		mPath0.quadTo(mBezierControl1.x, mBezierControl1.y, mBezierEnd1.x,
				mBezierEnd1.y);
		mPath0.lineTo(mTouch.x, mTouch.y);
		mPath0.lineTo(mBezierEnd2.x, mBezierEnd2.y);
		mPath0.quadTo(mBezierControl2.x, mBezierControl2.y, mBezierStart2.x,
				mBezierStart2.y);
		mPath0.lineTo(mCornerX, mCornerY);
		mPath0.close();
		canvas.save();
		canvas.clipPath(path, Region.Op.XOR);
		canvas.drawBitmap(bitmap, 0, 0, null);
		canvas.restore();
	}
	private void drawNextPageAreaAndShadow(Canvas canvas, Bitmap bitmap) {
		mPath1.reset();
		mPath1.moveTo(mBezierStart1.x, mBezierStart1.y);
		mPath1.lineTo(mBeziervertex1.x, mBeziervertex1.y);
		mPath1.lineTo(mBeziervertex2.x, mBeziervertex2.y);
		mPath1.lineTo(mBezierStart2.x, mBezierStart2.y);
		mPath1.lineTo(mCornerX, mCornerY);
		mPath1.close();
		mDegrees = (float) Math.toDegrees(Math.atan2(mBezierControl1.x
				- mCornerX, mBezierControl2.y - mCornerY));
		int leftx;
		int rightx;
		GradientDrawable mBackShadowDrawable;
		if (mIsRTandLB) {
			leftx = (int) (mBezierStart1.x);
			rightx = (int) (mBezierStart1.x + mTouchToCornerDis / 4);
			mBackShadowDrawable = mBackShadowDrawableLR;
		} else {
			leftx = (int) (mBezierStart1.x - mTouchToCornerDis / 4);
			rightx = (int) mBezierStart1.x;
			mBackShadowDrawable = mBackShadowDrawableRL;
		}
		canvas.save();
		canvas.clipPath(mPath0);
		canvas.clipPath(mPath1, Region.Op.INTERSECT);
		canvas.drawBitmap(bitmap, 0, 0, null);
		canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y);
		mBackShadowDrawable.setBounds(leftx, (int) mBezierStart1.y, rightx,
				(int) (mMaxLength + mBezierStart1.y));
		mBackShadowDrawable.draw(canvas);
		canvas.restore();
	}
	public void setBitmaps(Bitmap bm1, Bitmap bm2) {
		mCurPageBitmap = bm1;
		mNextPageBitmap = bm2;
	}
	public void setScreen(int w, int h) {
		mWidth = w;
		mHeight = h;
	}
	@Override
	protected void onDraw(Canvas canvas) {
		canvas.drawColor(0xFFAAAAAA);
		calcPoints();
		drawCurrentPageArea(canvas, mCurPageBitmap, mPath0);
		drawNextPageAreaAndShadow(canvas, mNextPageBitmap);
		drawCurrentPageShadow(canvas);
		drawCurrentBackArea(canvas, mCurPageBitmap);
	}
	/**
	 * Author : hmg25 Version: 1.0 Description : 创建阴影的GradientDrawable
	 */
	private void createDrawable() {
		int[] color = { 0x333333, 0xb0333333 };
		mFolderShadowDrawableRL = new GradientDrawable(
				GradientDrawable.Orientation.RIGHT_LEFT, color);
		mFolderShadowDrawableRL
				.setGradientType(GradientDrawable.LINEAR_GRADIENT);
		mFolderShadowDrawableLR = new GradientDrawable(
				GradientDrawable.Orientation.LEFT_RIGHT, color);
		mFolderShadowDrawableLR
				.setGradientType(GradientDrawable.LINEAR_GRADIENT);
		mBackShadowColors = new int[] { 0xff111111, 0x111111 };
		mBackShadowDrawableRL = new GradientDrawable(
				GradientDrawable.Orientation.RIGHT_LEFT, mBackShadowColors);
		mBackShadowDrawableRL.setGradientType(GradientDrawable.LINEAR_GRADIENT);
		mBackShadowDrawableLR = new GradientDrawable(
				GradientDrawable.Orientation.LEFT_RIGHT, mBackShadowColors);
		mBackShadowDrawableLR.setGradientType(GradientDrawable.LINEAR_GRADIENT);
		mFrontShadowColors = new int[] { 0x80111111, 0x111111 };
		mFrontShadowDrawableVLR = new GradientDrawable(
				GradientDrawable.Orientation.LEFT_RIGHT, mFrontShadowColors);
		mFrontShadowDrawableVLR
				.setGradientType(GradientDrawable.LINEAR_GRADIENT);
		mFrontShadowDrawableVRL = new GradientDrawable(
				GradientDrawable.Orientation.RIGHT_LEFT, mFrontShadowColors);
		mFrontShadowDrawableVRL
				.setGradientType(GradientDrawable.LINEAR_GRADIENT);
		mFrontShadowDrawableHTB = new GradientDrawable(
				GradientDrawable.Orientation.TOP_BOTTOM, mFrontShadowColors);
		mFrontShadowDrawableHTB
				.setGradientType(GradientDrawable.LINEAR_GRADIENT);
		mFrontShadowDrawableHBT = new GradientDrawable(
				GradientDrawable.Orientation.BOTTOM_TOP, mFrontShadowColors);
		mFrontShadowDrawableHBT
				.setGradientType(GradientDrawable.LINEAR_GRADIENT);
	}
	/**
	 * Author : hmg25 Version: 1.0 Description : 绘制翻起页的阴影
	 */
	public void drawCurrentPageShadow(Canvas canvas) {
		double degree;
		if (mIsRTandLB) {
			degree = Math.PI
					/ 4
					- Math.atan2(mBezierControl1.y - mTouch.y, mTouch.x
							- mBezierControl1.x);
		} else {
			degree = Math.PI
					/ 4
					- Math.atan2(mTouch.y - mBezierControl1.y, mTouch.x
							- mBezierControl1.x);
		}
		// 翻起页阴影顶点与touch点的距离
		double d1 = (float) 25 * 1.414 * Math.cos(degree);
		double d2 = (float) 25 * 1.414 * Math.sin(degree);
		float x = (float) (mTouch.x + d1);
		float y;
		if (mIsRTandLB) {
			y = (float) (mTouch.y + d2);
		} else {
			y = (float) (mTouch.y - d2);
		}
		mPath1.reset();
		mPath1.moveTo(x, y);
		mPath1.lineTo(mTouch.x, mTouch.y);
		mPath1.lineTo(mBezierControl1.x, mBezierControl1.y);
		mPath1.lineTo(mBezierStart1.x, mBezierStart1.y);
		mPath1.close();
		float rotateDegrees;
		canvas.save();
		canvas.clipPath(mPath0, Region.Op.XOR);
		canvas.clipPath(mPath1, Region.Op.INTERSECT);
		int leftx;
		int rightx;
		GradientDrawable mCurrentPageShadow;
		if (mIsRTandLB) {
			leftx = (int) (mBezierControl1.x);
			rightx = (int) mBezierControl1.x + 25;
			mCurrentPageShadow = mFrontShadowDrawableVLR;
		} else {
			leftx = (int) (mBezierControl1.x - 25);
			rightx = (int) mBezierControl1.x + 1;
			mCurrentPageShadow = mFrontShadowDrawableVRL;
		}
		rotateDegrees = (float) Math.toDegrees(Math.atan2(mTouch.x
				- mBezierControl1.x, mBezierControl1.y - mTouch.y));
		canvas.rotate(rotateDegrees, mBezierControl1.x, mBezierControl1.y);
		mCurrentPageShadow.setBounds(leftx,
				(int) (mBezierControl1.y - mMaxLength), rightx,
				(int) (mBezierControl1.y));
		mCurrentPageShadow.draw(canvas);
		canvas.restore();
		mPath1.reset();
		mPath1.moveTo(x, y);
		mPath1.lineTo(mTouch.x, mTouch.y);
		mPath1.lineTo(mBezierControl2.x, mBezierControl2.y);
		mPath1.lineTo(mBezierStart2.x, mBezierStart2.y);
		mPath1.close();
		canvas.save();
		canvas.clipPath(mPath0, Region.Op.XOR);
		canvas.clipPath(mPath1, Region.Op.INTERSECT);
		if (mIsRTandLB) {
			leftx = (int) (mBezierControl2.y);
			rightx = (int) (mBezierControl2.y + 25);
			mCurrentPageShadow = mFrontShadowDrawableHTB;
		} else {
			leftx = (int) (mBezierControl2.y - 25);
			rightx = (int) (mBezierControl2.y + 1);
			mCurrentPageShadow = mFrontShadowDrawableHBT;
		}
		rotateDegrees = (float) Math.toDegrees(Math.atan2(mBezierControl2.y
				- mTouch.y, mBezierControl2.x - mTouch.x));
		canvas.rotate(rotateDegrees, mBezierControl2.x, mBezierControl2.y);
		float temp;
		if (mBezierControl2.y < 0)
			temp = mBezierControl2.y - mHeight;
		else
			temp = mBezierControl2.y;
		int hmg = (int) Math.hypot(mBezierControl2.x, temp);
		if (hmg > mMaxLength)
			mCurrentPageShadow
					.setBounds((int) (mBezierControl2.x - 25) - hmg, leftx,
							(int) (mBezierControl2.x + mMaxLength) - hmg,
							rightx);
		else
			mCurrentPageShadow.setBounds(
					(int) (mBezierControl2.x - mMaxLength), leftx,
					(int) (mBezierControl2.x), rightx);
		// Log.i("hmg", "mBezierControl2.x   " + mBezierControl2.x
		// + "  mBezierControl2.y  " + mBezierControl2.y);
		mCurrentPageShadow.draw(canvas);
		canvas.restore();
	}
	/**
	 * Author : hmg25 Version: 1.0 Description : 绘制翻起页背面
	 */
	private void drawCurrentBackArea(Canvas canvas, Bitmap bitmap) {
		int i = (int) (mBezierStart1.x + mBezierControl1.x) / 2;
		float f1 = Math.abs(i - mBezierControl1.x);
		int i1 = (int) (mBezierStart2.y + mBezierControl2.y) / 2;
		float f2 = Math.abs(i1 - mBezierControl2.y);
		float f3 = Math.min(f1, f2);
		mPath1.reset();
		mPath1.moveTo(mBeziervertex2.x, mBeziervertex2.y);
		mPath1.lineTo(mBeziervertex1.x, mBeziervertex1.y);
		mPath1.lineTo(mBezierEnd1.x, mBezierEnd1.y);
		mPath1.lineTo(mTouch.x, mTouch.y);
		mPath1.lineTo(mBezierEnd2.x, mBezierEnd2.y);
		mPath1.close();
		GradientDrawable mFolderShadowDrawable;
		int left;
		int right;
		if (mIsRTandLB) {
			left = (int) (mBezierStart1.x - 1);
			right = (int) (mBezierStart1.x + f3 + 1);
			mFolderShadowDrawable = mFolderShadowDrawableLR;
		} else {
			left = (int) (mBezierStart1.x - f3 - 1);
			right = (int) (mBezierStart1.x + 1);
			mFolderShadowDrawable = mFolderShadowDrawableRL;
		}
		canvas.save();
		canvas.clipPath(mPath0);
		canvas.clipPath(mPath1, Region.Op.INTERSECT);
		mPaint.setColorFilter(mColorMatrixFilter);
		float dis = (float) Math.hypot(mCornerX - mBezierControl1.x,
				mBezierControl2.y - mCornerY);
		float f8 = (mCornerX - mBezierControl1.x) / dis;
		float f9 = (mBezierControl2.y - mCornerY) / dis;
		mMatrixArray[0] = 1 - 2 * f9 * f9;
		mMatrixArray[1] = 2 * f8 * f9;
		mMatrixArray[3] = mMatrixArray[1];
		mMatrixArray[4] = 1 - 2 * f8 * f8;
		mMatrix.reset();
		mMatrix.setValues(mMatrixArray);
		mMatrix.preTranslate(-mBezierControl1.x, -mBezierControl1.y);
		mMatrix.postTranslate(mBezierControl1.x, mBezierControl1.y);
		canvas.drawBitmap(bitmap, mMatrix, mPaint);
		// canvas.drawBitmap(bitmap, mMatrix, null);
		mPaint.setColorFilter(null);
		canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y);
		mFolderShadowDrawable.setBounds(left, (int) mBezierStart1.y, right,
				(int) (mBezierStart1.y + mMaxLength));
		mFolderShadowDrawable.draw(canvas);
		canvas.restore();
	}
	public void computeScroll() {
		super.computeScroll();
		if (mScroller.computeScrollOffset()) {
			float x = mScroller.getCurrX();
			float y = mScroller.getCurrY();
			mTouch.x = x;
			mTouch.y = y;
			postInvalidate();
		}
	}
	private void startAnimation(int delayMillis) {
		int dx, dy;
		// dx 水平方向滑动的距离,负值会使滚动向左滚动
		// dy 垂直方向滑动的距离,负值会使滚动向上滚动
		if (mCornerX > 0) {
			dx = -(int) (mWidth + mTouch.x);
		} else {
			dx = (int) (mWidth - mTouch.x + mWidth);
		}
		if (mCornerY > 0) {
			dy = (int) (mHeight - mTouch.y);
		} else {
			dy = (int) (1 - mTouch.y); // 防止mTouch.y最终变为0
		}
		mScroller.startScroll((int) mTouch.x, (int) mTouch.y, dx, dy,
				delayMillis);
	}
	public void abortAnimation() {
		if (!mScroller.isFinished()) {
			mScroller.abortAnimation();
		}
	}
	public boolean canDragOver() {
		if (mTouchToCornerDis > mWidth / 10)
			return true;
		return false;
	}
	/**
	 * Author : hmg25 Version: 1.0 Description : 是否从左边翻向右边
	 */
	public boolean DragToRight() {
		if (mCornerX > 0)
			return false;
		return true;
	}
}

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