Android app的电子书翻页卷曲功能

//读取文件，设置翻页时的阴影和背面文字

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<String> m_lines = new Vector<String>();private int m_fontSize = 24;private int m_textColor = Color.BLACK;private int m_backColor = 0xffff9e85; // 背景颜色private int marginWidth = 10; // 左右与边缘的距离private int marginHeight = 15; // 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 Paint mPaint;public BookPageFactory(int w, int h) {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) throws IOException {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);}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<String> pageDown() {String strParagraph = "";Vector<String> lines = new Vector<String>();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 blocke.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 blocke.printStackTrace();}}}return lines;}protected void pageUp() {if (m_mbBufBegin < 0)m_mbBufBegin = 0;Vector<String> lines = new Vector<String>();String strParagraph = "";while (lines.size() < mLineCount && m_mbBufBegin > 0) {Vector<String> paraLines = new Vector<String>();byte[] paraBuf = readParagraphBack(m_mbBufBegin);m_mbBufBegin -= paraBuf.length;try {strParagraph = new String(paraBuf, m_strCharsetName);} catch (UnsupportedEncodingException e) {// TODO Auto-generated catch blocke.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 blocke.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);elsec.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) {m_book_bg = BG;}public boolean isfirstPage() {return m_isfirstPage;}public boolean islastPage() {return m_islastPage;}}

//电子书阅读主类

public class Turntest extends Activity {private PageWidget mPageWidget;Bitmap mCurPageBitmap, mNextPageBitmap;Canvas mCurPageCanvas, mNextPageCanvas;BookPageFactory pagefactory;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);mPageWidget = new PageWidget(this);setContentView(mPageWidget);mCurPageBitmap = Bitmap.createBitmap(480, 800, Bitmap.Config.ARGB_8888);mNextPageBitmap = Bitmap.createBitmap(480, 800, Bitmap.Config.ARGB_8888);mCurPageCanvas = new Canvas(mCurPageBitmap);mNextPageCanvas = new Canvas(mNextPageBitmap);pagefactory = new BookPageFactory(480, 800);pagefactory.setBgBitmap(BitmapFactory.decodeResource(this.getResources(), R.drawable.bg));try {pagefactory.openbook("/sdcard/test.txt");pagefactory.onDraw(mCurPageCanvas);} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();Toast.makeText(this, "电子书不存在,请将《test.txt》放在SD卡根目录下",Toast.LENGTH_SHORT).show();}mPageWidget.setBitmaps(mCurPageBitmap, mCurPageBitmap);mPageWidget.setOnTouchListener(new OnTouchListener() {public boolean onTouch(View v, MotionEvent e) {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 blocke1.printStackTrace();}if(pagefactory.isfirstPage())return false;pagefactory.onDraw(mNextPageCanvas);} else {try {pagefactory.nextPage();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}if(pagefactory.islastPage())return false;pagefactory.onDraw(mNextPageCanvas);}mPageWidget.setBitmaps(mCurPageBitmap, mNextPageBitmap);}               ret = mPageWidget.doTouchEvent(e);return ret;}return false;}});}}

Android app的电子书翻页卷曲功能_第1张图片

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