How to draw Arc between two points on the Canvas?

Finally I got the solution from this code:

float radius = 20;
final RectF oval = new RectF();
oval.set(point1.x - radius, point1.y - radius, point1.x + radius, point1.y+ radius);
Path myPath = new Path();
myPath.arcTo(oval, startAngle, -(float) sweepAngle, true);

To calculate startAngle, use this code:

int startAngle = (int) (180 / Math.PI * Math.atan2(point.y - point1.y, point.x - point1.x));

Here, point1 means where you want to start drawing the Arc. sweepAngle means the angle between two lines. We have to calculate that by using two points like the blue points in my Question image.

Do something like this:

//Initialized paint on a class level object.
Paint p = new Paint();
p.setColor(Color.BLACK);
//Calculate the rect / bounds of oval
RectF rectF = new RectF(50, 20, 100, 80);

@Override
protected void onDraw(Canvas canvas) {      
    //Do the drawing in onDraw() method of View.
    canvas.drawArc (rectF, 90, 45, false, p);
}