How to paint the sector picture below?

Once you decide to draw with lines (drawLine), then you need to continue. To begin with, you should have logic that defines all your boundaries, and then start drawing. I took the center of the circle and painted the left quarter in green.

 public class MyView extends View { Paint paint; public MyView(Context context) { super(context); init(); } private void init(){ // значения по умолчанию paint = new Paint(); paint.setColor(Color.BLUE); paint.setStrokeWidth(5); paint.setStyle(Paint.Style.STROKE); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawLine(100,100,200,100, paint); // startX, startY, stopX, stopY линии диаметра canvas.drawLine(150,50,150,150, paint); canvas.drawLine(143,98,143,52, initGreen()); //закраска зеленым canvas.drawLine(135,98,135,55, initGreen()); //двигаем закраску по оси Х canvas.drawLine(127,98,127,58, initGreen()); //двигаем закраску по оси Х canvas.drawLine(120,98,120,61, initGreen()); //двигаем закраску по оси Х canvas.drawLine(113,98,113,61, initGreen()); //двигаем закраску по оси Х canvas.drawLine(105,98,105,63, initGreen()); //двигаем закраску по оси Х canvas.drawCircle(150, 100, 50, initBlue()); } private Paint initGreen(){ paint.setStrokeWidth(10); paint.setColor(Color.GREEN); return paint; } private Paint initBlue(){ paint.setStrokeWidth(5); paint.setColor(Color.BLUE); return paint; } }