Android View: force onDraw() and wait till its done

Question

I got a View and want to update it every time a new line object is stored in my lines array. This happens at drawLine(). Therefore drawYourselfe() should somehow force onDraw() and wait till its done. Here is a part of my code. Can anyone tell me how drawYourselfe() should look?

public class MyView extends View{

    private ArrayList<Line> lines;
    private Paint paint; //created in constructor

    protected void drawLine(float[] f)
    {
        if(f.length != 5)
        {

        } else {
            lines.add(new Line(f));
            Log.d("SuM","added Line");
            if(!bufferedDrawing) // in this example bufferedDrawing=false because i want to update the View on every new Line;
            {
                drawYourselfe();
            }

        }
    }

    protected void onDraw(Canvas canvas) {
        Log.d("SuM","onDraw");

        for(Line l : lines)
        {
            l.analysis(); //Logs fromX,toX,fromY,toY and color to console

            paint.setColor(l.getColor());
            canvas.drawLine(l.getFromX(),l.getFromY(),l.getToX(),l.getToY(), paint);

        } 

    }

    public void drawYourselfe()
    {
        //When this is called, onDraw should be called and the Thread should wait till its done;
    }

}  

Edit: I better mention what I want to do and why just simply invalidate() doesnt work: In my MainActivity I call

myView.drawLine(line1);
myView.drawLine(line2);
myView.drawLine(line3);
//and so on...

and I want to see how these lines are drawn one after one. When calling invalidate() in drawYourselfe() I only see all lines drawn but not one after one. I know that these tree lines are drawn so fast that I cant see them drawn one by one, but in the app Im doing it with thousand of lines.

Answer 1

Call invalidate(), but there is no way to wait for the draw to complete. draw will be called later, after your drawLine call returns.