Program: 87029
Project: 87029
Buggy source:
@Override protected void onDraw(Canvas canvas){
  super.onDraw(canvas);
  if (!mShowNumbers)   return;
  mPaint.setAlpha((int)(mScale * (mHighlight ? 64 : 255)));
  final float cellSize=(canvas.getWidth() / mGridSize) * (mScale * 0.4f + 0.6f);
  final float xOffset=(1.0f - (mScale * 0.4f + 0.6f)) * canvas.getWidth() / 2;
  final float yOffset=(1.0f - (mScale * 0.4f + 0.6f)) * canvas.getWidth() / 2;
  float drawX=-cellSize / 1.5F + xOffset;
  for (int x=-1; x < mGridSize + 1; x++) {
    float drawY=-mTextBounds.bottom + cellSize / 1.5F - cellSize + yOffset;
    for (int y=-1; y < mGridSize + 1; y++) {
      if (DEBUG) {
        if (x == -1 || y == -1 || x == mGridSize || y == mGridSize) {
          mPaint.setColor(Color.RED);
        }
 else {
          mPaint.setColor(Color.WHITE);
        }
      }
      int cellX=(int)(x - mScrollX / cellSize);
      int cellY=(int)(y - mScrollY / cellSize);
      if (mScrollX / cellSize <= 0 && cellX != 0)       cellX--;
      if (mScrollY / cellSize <= 0 && cellY != 0)       cellY--;
      if (mHighlight && mHighlightX == cellX && mHighlightY == cellY) {
        mPaint.setAlpha((int)mScale * 255);
        Log.d("String_Node_Str","String_Node_Str" + cellX + "String_Node_Str"+ cellY);
      }
      Integer number=getNumberForXY(cellX,cellY);
      canvas.drawText(number.toString(),drawX + mScrollX % cellSize,drawY + mScrollY % cellSize,mPaint);
      if (mHighlight && mHighlightX == cellX && mHighlightY == cellY) {
        mPaint.setAlpha((int)mScale * 64);
      }
      drawY+=cellSize;
    }
    drawX+=cellSize;
  }
  if (DEBUG) {
    canvas.drawText(mScrollX / cellSize + "String_Node_Str" + mScrollY / cellSize,0,mTextBounds.bottom * 26.5f,mPaint);
  }
}

Fixed version (ground truth):
@Override protected void onDraw(Canvas canvas){
  super.onDraw(canvas);
  if (!mShowNumbers)   return;
  mPaint.setAlpha((int)(mScale * (mHighlight ? 64 : 255)));
  final float cellSize=(canvas.getWidth() / (float)mGridSize) * (mScale * 0.4f + 0.6f);
  final float xOffset=(1.0f - (mScale * 0.4f + 0.6f)) * canvas.getWidth() / 2;
  final float yOffset=(1.0f - (mScale * 0.4f + 0.6f)) * canvas.getWidth() / 2;
  float drawX=-cellSize / 1.5F + xOffset;
  for (int x=-1; x < mGridSize + 1; x++) {
    float drawY=-mTextBounds.bottom + cellSize / 1.5F - cellSize + yOffset;
    for (int y=-1; y < mGridSize + 1; y++) {
      if (DEBUG) {
        if (x == -1 || y == -1 || x == mGridSize || y == mGridSize) {
          mPaint.setColor(Color.RED);
        }
 else {
          mPaint.setColor(Color.WHITE);
        }
      }
      int cellX=(int)(x - Math.floor(mScrollX / cellSize));
      int cellY=(int)(y - Math.floor(mScrollY / cellSize));
      if (mScrollX / cellSize <= 0 && cellX != 0 && mScrollX != 0)       cellX--;
      if (mScrollY / cellSize <= 0 && cellY != 0 && mScrollY != 0)       cellY--;
      if (mHighlight && mHighlightX == cellX && mHighlightY == cellY) {
        mPaint.setAlpha((int)mScale * 255);
      }
      Integer number=getNumberForXY(cellX,cellY);
      canvas.drawText(number.toString(),drawX + mScrollX % cellSize,drawY + mScrollY % cellSize,mPaint);
      if (mHighlight && mHighlightX == cellX && mHighlightY == cellY) {
        mPaint.setAlpha((int)mScale * 64);
      }
      drawY+=cellSize;
    }
    drawX+=cellSize;
  }
  if (DEBUG) {
    canvas.drawText(mScrollX / cellSize + "String_Node_Str" + mScrollY / cellSize,0,mTextBounds.bottom * 26.5f,mPaint);
  }
}