[android help] ArrayIndexOutOfBoundsException on collision detection

I have a sprite and I have a maze which is randomly generated so I have a method here which checks if a wall is there and return true if there is.

I have a maze which is drawn and checks if there is a wall:

  public boolean isWall(int oldX, int oldY, int newX, int newY) {
    boolean wallPresent;
    if      ((oldX == newX) && (oldY == newY)) { wallPresent = false; } 
    else if (newX == oldX - 1) { 
      wallPresent = west[oldX][oldY];
    } else if (newX == oldX + 1) { 
      wallPresent = east[oldX][oldY];
    } else if (newY == oldY - 1) { 
      wallPresent = north[oldX][oldY]; 
    } else if (newY == oldY + 1) { 
      wallPresent = south[oldX][oldY]; 
    } else { wallPresent = false; }

    if ((oldX != newX) && (oldY != newY)) {
      if ((newX == oldX + 1) && (newY == oldY + 1) &&
        (north[newX][newY] || west[newX][newY]) ) { 
          wallPresent = true; 
      } else if ((newX == oldX + 1) && (newY == oldY - 1) &&
        (south[newX][newY] || west[newX][newY]) ) { 
         wallPresent = true; 
      } else if ((newX == oldX - 1) && (newY == oldY + 1) &&
        (north[newX][newY] || east[newX][newY]) ) { 
         wallPresent = true; 
      } else if ((newX == oldX - 1) && (newY == oldY - 1) &&
        (south[newX][newY] || east[newX][newY]) ) { 
         wallPresent = true; 
      }
    }

    return wallPresent;
  }

I have also created a sprite in the form of a bitmap image and this is my movement and collision detection:

public void onDraw(Canvas canvas) {

    while (Game.pressedUp) {
        movementGo();
    }

    // update();
    // SOURCE EDU4JAVA - www.edu4java.com
    // using the rows and columns of the sprite field, separate the required
    // sprite
    int srcX = currentFrame * width;
    int srcY = direction * height;

    src = new Rect(srcX, srcY, srcX + width, srcY + height);
    dst = new Rect(x, y, x + width, y + height);
    //System.out.println(x);
    //System.out.println(y);
    // SOURCE END
    canvas.drawBitmap(bmp, src, dst, null);
}
//x+width
private boolean canBallMove(int x, int y) {
    int cellWidth = 64;
    int newMidX = x + x/2;
    int newMidY = y + y/2;

    // Find out which cell ball's middle was in.
    // Note that this division will round down, which is correct
    int oldCellX = x + xSpeed/cellWidth +1;
    int oldCellY = y + xSpeed/cellWidth +1;

    // Find out which cell ball's middle would be in now
    int newCellX = newMidX/cellWidth + 1 ;
    int newCellY = newMidY/cellWidth + 1;
    System.out.println(newCellX);
    System.out.println(newCellY);
    if ((newMidX % cellWidth) + x >= cellWidth) {
        newCellX++;
      }
      if ((newMidX % cellWidth) - x <= 0) {
        newCellX--;
      }
      if ((newMidY % cellWidth) + y>= cellWidth) {
        newCellY++;
      }
      if ((newMidY % cellWidth) - y <= 0) {
        newCellY--;
      }


    return !(Game.gameV.isWall(oldCellX, oldCellY, newCellX, newCellY));
  }

}

Now, the else statement triggers, meaning that it knows there is a wall nearby but I still think its broken and now I keep getting these ArrayIndexOutOfBoundsException crashes? Any clue anyone?

.

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