How to animate line gradually growing from starting point to ending point !

In android there is no proper way to animate line growing from one point to another.

However I achieved it based on the below formula here. Since every one of us is dummy !
To divide an line into equal parts the respective starting point (x1,y1) and ending point (x2,y2) are,

(x, y) =(x1 + k(x2 — x1), y1 + k(y2 — y1))

where “k” = 1 / N (“N” is the total parts).

Step 1: Select (x1,y1) and (x2,y2) of line,

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    // starting point
    x1 = 50;
    y1 = 50;

    // ending point
    x2 = getWidth() / 2 + getWidth() / 4;
    y2 = getHeight() / 2 + getHeight() / 4;

    Log.d("line xy xy", x1 + " : " + y1 + " : " + x2 + " : " + y2);

    divideLineIntoEqualParts();
}

Step 2: Dividing the line and adding respective points in a List.

// dividing line into 50 equal parts
private void divideLineIntoEqualParts() {
     /*
     * Courtesy : www.dummies.com
     * (x,y) = (x1 + k(x2 — x1),y1 + k(y2 — y1))
     * */
    listOfPoints.clear();
    for (int k = 1; k <= 50; k++) {
        listOfPoints.add(new PointF(x1 + ((k * (x2 — x1)) / 50),y1 + (k * (y2 —y1)) /50));
    }
    Log.d("listOfPoints : size : ", listOfPoints.size() + "");
}

Step 3: onDraw(Canvas canvas)
Each time I try to draw a line from 0th point to another point hence it seems like gradually growing line.

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    if (inte < listOfPoints.size()) {
        canvas.drawLine(listOfPoints.get(0).x, listOfPoints.get(0).y, listOfPoints.get(inte).x, listOfPoints.get(inte).y, paint);
        inte++;
        if (inte < listOfPoints.size()) {
            invalidate();
        }
    }
}

Source code is available in github.

Enjoy! Happy coding!