回答

2
public class CustomView extends View{ 

    public onDraw(Canvas canvas){ 
    // Take paint object 
     Paint fillBackgroundPaint = new Paint(); 
     fillBackgroundPaint.setColor(ContextCompat.getColor(context, R.color.black)); 

     // Draw lines and Rectangles by using the below methods on canvas 
     canvas.drawLine() 
     canvas.drawRect() 

    } 
    }