读写文本

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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_textCode = "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 = 20;
private int m_textColor = Color.BLACK;
private int m_backColor = 0xffff9e85;
private int marginWidth = 15;
private int marginHeight = 20;

private int mLineCount;
private float mVisibleHeight;
private float mVisibleWidth;
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);
}

/**
* 读取本地图书
*
* @param filePath 文件路径
* @throws IOException
*/
public void openbook(String filePath) throws IOException {
book_file = new File(filePath);

String encoding = FileLocalCache.getTextCode(filePath);
m_textCode = FileLocalCache.coverEncoding(encoding);

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_textCode.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_textCode.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;
}

protected byte[] readParagraphForward(int nFromPos) {
int nStart = nFromPos;
int i = nStart;
byte b0, b1;
if (m_textCode.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_textCode.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;
}

/**
* next page
*/
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);
m_mbBufEnd += paraBuf.length;
try {
strParagraph = new String(paraBuf, m_textCode);
} 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_textCode).length;
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.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_textCode);
} 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_textCode).length;
lines.remove(0);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
m_mbBufEnd = m_mbBufBegin;
return;
}

public 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) {
m_book_bg = BG;
}

public boolean isfirstPage() {
return m_isfirstPage;
}

public boolean islastPage() {
return m_islastPage;
}

public void setTextCode(String textCode){
this.m_textCode = textCode;
}
}