android 电子书翻页效果
- PageWidget
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 static final String TAG = "hmg"; private int mWidth = 480; private int mHeight = 800; 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) { super(context); // TODO Auto-generated constructor stub 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; } 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; } 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 = (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); } 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); } 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(); } 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; } public boolean DragToRight() { if (mCornerX > 0) return false; return true; } }2 BookPageFactory
import java.io.File; 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<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 = 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) 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 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<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 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) { m_book_bg = BG; } public boolean isfirstPage() { return m_isfirstPage; } public boolean islastPage() { return m_islastPage; } }
3import java.io.IOException; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.os.Bundle; 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 { private PageWidget mPageWidget; Bitmap mCurPageBitmap, mNextPageBitmap; Canvas mCurPageCanvas, mNextPageCanvas; 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); 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 block e1.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() { @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; } }); } }