Txt文本阅读器电子书

package com.example.mytxtreader; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.RandomAccessFile; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; import android.annotation.SuppressLint; import android.app.Activity; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import com.example.mytxtreader.MySeekBar.OnSeekBarChangeListener; /** * @author ludonghui * 设计思想：写此demo时，刚开始接触Android，对canvas还不了解，所以并没有采用自定义控件 * 的方式来画出文本，而是用的系统的TextView控件 * 用内存映射的方式读取文件，每次读取固定大小，再用scorllTo函数实现上下移动和翻页功能 */ @SuppressLint("HandlerLeak") public class TxtContent extends Activity implements MyTextView.scrollInterface { //test private MappedByteBuffer m_mbBuf = null; //内存映射， private long m_mbBufLen = 0; //目标文件的总长度，字节数 private final int ONCE_SIZE = 4096; //每次读取的字节数，要求大于2*每页最大字节数，否则会有BUG private String m_strCurPage = null; //当前显示在TextView控件里的内容 private int m_sizeCount = 1; //此次读取了一个PAGESIZE还是两个PAGESIZE private int m_totalCount = 0; //目标文件的总读取次数 private int m_curIndex = 0; //当前读取的次数序号 private int nTextHeight = 0; //当前TextView控件里的文本高度 行数*行高 private int m_curPageHeigh = 0; //当前ONCE_SIZE的文本高度 private int m_nextPageHeight = 0; //下一个ONCE_SIZE的文本高度，用于计算ScrollTo()的参数 private int m_pageHeight = 0; //当前文本框的高度，用于翻页计算 private int m_endScroll = 0; //最后一页的ScrollTo位置 private final int OFFSETPARA = 20; //每页下移的偏移量参数，防止可以看到部分上一行的内容 private String filenameString; //目标文件路径 private static final String gbk = "GBK"; // private static final String utf8 = "UTF-8"; private static final String unicode = "UTF-16LE"; private static final String unicodeBigEnd = "UTF-16BE"; private static final int PROCESSMAX = 1000; //PROCESS的最大值 private String defaultCode = gbk; //当前编码格式 private MyTextView tvMain; //复写的TextView类，实现滑动效果 private MySeekBar seekBar; //复写的竖直SeekBar private Button btnPreButton; private Button btnNextButton; private Button btnAutoStroll; private boolean isScroll = false; //是否正在自动滚屏 private int scrollCount = 0; //已滚屏次数 private int m_scrollStep = 5; //每次滚屏的高度 private final int SCROLL_BEGIN = 1; private final int SCROLL_END = 2; private final int SCROLL_STOP = 3; private int m_bgID = 1; //背景 private int m_textSize = 18; //字号大小 private int m_process = 0; //当前进度 private final String SAVEBG = "bgID"; private final String SAVETEXTSIZE = "textsize"; private final int CLBACK = 0xFF1A1A1A; private final int CLWHITE = 0xFFEEEEEE; private SpeekUtil speekUtil; //TTS类 private Context context; private String m_strTTS; //当前TTS播报内容，即当前可见文本内容 /* (non-Javadoc) * @see com.example.mytxtreader.MyTextView.scrollInterface#scrollBy(int) * 点击屏幕移动时操作，移动文本，设置TTS播报内容，刷新进度条 */ @Override public void scrollBy(int dely) { if (dely > 0) { textMoveDown(dely); getTTSContent(); refreshProcess(); } if (dely < 0) { textMoveUp(-dely); getTTSContent(); refreshProcess(); } } Handler strollHandler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what) { case SCROLL_BEGIN: if ((m_curIndex >= m_totalCount - m_sizeCount) && (tvMain.getScrollY() >= m_endScroll)) { strollHandler.sendEmptyMessage(SCROLL_END); scrollCount = 0; } else { textMoveDown(m_scrollStep); scrollCount++; if (scrollCount % (tvMain.getLineHeight()/m_scrollStep) == 0) { scrollCount = 0; getTTSContent(); refreshProcess(); } strollHandler.sendEmptyMessageDelayed(SCROLL_BEGIN, 30); } break; case SCROLL_END: strollHandler.removeMessages(SCROLL_BEGIN); strollHandler.removeMessages(SCROLL_STOP); isScroll = false; scrollCount = 0; break; case SCROLL_STOP: strollHandler.removeMessages(SCROLL_BEGIN); strollHandler.removeMessages(SCROLL_END); isScroll = false; scrollCount = 0; break; default: break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_txt_content); btnPreButton = (Button) findViewById(R.id.viewtxt_pre_button); btnPreButton.setOnClickListener(new BtnClickListener()); btnNextButton = (Button) findViewById(R.id.viewtxt_next_button); btnNextButton.setOnClickListener(new BtnClickListener()); btnAutoStroll = (Button) findViewById(R.id.viewtxt_auto_scroll_button); btnAutoStroll.setOnClickListener(new BtnClickListener()); seekBar = (MySeekBar) findViewById(R.id.seekBar1); seekBar.setMax(PROCESSMAX); seekBar.setOnSeekBarChangeListener(onSeekBarChangeListener); // seekBar.setThumbOffset(5); try { readFile(); } catch (Exception e) { Log.e("Debug", "Read file error"); } context = this; } @Override protected void onDestroy() { super.onDestroy(); saveParam(filenameString); } /** * @param index * 防止当前字符被截断造成乱码 * @return */ private int GetCurWordCutLen(int index) { if (index <= 0) { return 0; } if (defaultCode == gbk) { // GBK编码规则：0x81~0xFE 0x40~0xFE, int i = 0; int curByte = m_mbBuf.get(index) & 0xFF; int lastByte = m_mbBuf.get(index - 1) & 0xFF; if (curByte >= 0x40 && curByte <= 0xFE) { while (lastByte >= 0x81 && lastByte <= 0xFE && index - i - 1 >= 0) { i++; lastByte = m_mbBuf.get(index - i - 1) & 0xFF; } } if (i % 2 == 0) { return index; } else { return index - 1; } } if (defaultCode == utf8) { // UTF8编码规则 // 000080 - 0007FF 编码规则 110xxxxx 10xxxxxx // 000800 - 00FFFF 编码规则 1110xxxx 10xxxxxx 10xxxxxx // 010000 - 10FFFF 编码规则 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx int curByte = m_mbBuf.get(index) & 0xFF; while (curByte >= 0x80 && curByte <= 0xBF) { index--; curByte = m_mbBuf.get(index) & 0xFF; } return index; } return index; } // private String readMappedByteBuffer(int pageIndex) { return readMappedByteBuffer(pageIndex, 1); } /** * @param index * @param count * @return * 读取当前ONCE_SIZE的内容 */ private String readMappedByteBuffer(int index, int count) { if (index >= m_totalCount || index < 0) { return null; } int start = index * ONCE_SIZE; start = GetCurWordCutLen(start); long len = 0; if (ONCE_SIZE <= m_mbBufLen) { len = (start + ONCE_SIZE * count <= m_mbBufLen) ? ONCE_SIZE * count : m_mbBufLen - start; } else { len = m_mbBufLen; } byte pageBuf[] = new byte[(int) len]; for (int i = 0; i < len; i++) { pageBuf[i] = m_mbBuf.get(start + i); } String string = null; try { string = new String(pageBuf, defaultCode); } catch (Exception e) { Log.e("Debug", "Get string from byte[]"); } return string; } /** * 获取当前TTS播报的文本 */ private void getTTSContent() { // int scrollY = (tvMain.GetMyScrollY() > 0) ? tvMain.GetMyScrollY() + // 50 : 0; // int line = tvMain.getLayout().getLineForVertical( // scrollY - tvMain.getTotalPaddingTop()); int line = tvMain.GetMyScrollY() / tvMain.getLineHeight(); if (line >= tvMain.getLineCount() - 1) { return; } int st = tvMain.getLayout().getOffsetForHorizontal(line, 0 - tvMain.get