Android Divider custom view 1dp x fullwidth

Divider.java

public class Divider extends View {

  private Paint paint;
  private int width;
  private float density;

  public Divider(Context context) {
    super(context);
    init(context);
  }

  public Divider(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    init(context);
  }

  public Divider(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init(context);
  }

  private void init(Context context) {
    density = getResources().getDisplayMetrics().density;
    paint = new Paint();
    paint.setAntiAlias(true);
    paint.setColor(Color.parseColor("#a7a6ab"));
    paint.setAlpha(63); // 25%

  }

  @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int desiredWidth = dpToPx(200);
    int desiredHeight = dpToPx(1);

    int widthMode = MeasureSpec.getMode(widthMeasureSpec);
    int widthSize = MeasureSpec.getSize(widthMeasureSpec);
    int heightMode = MeasureSpec.getMode(heightMeasureSpec);
    int heightSize = MeasureSpec.getSize(heightMeasureSpec);

    int width;
    int height;

    if (widthMode == MeasureSpec.EXACTLY) {
      width = widthSize;
    } else if (widthMode == MeasureSpec.AT_MOST) {
      width = Math.min(desiredWidth, widthSize);
    } else {
      width = desiredWidth;
    }

    if (heightMode == MeasureSpec.EXACTLY) {
      height = heightSize;
    } else if (heightMode == MeasureSpec.AT_MOST) {
      height = Math.min(desiredHeight, heightSize);
    } else {
      height = desiredHeight;
    }

    this.width = width;
    setMeasuredDimension(width, desiredHeight);
  }

  private int dpToPx(int dp) {
    return (int) (density * dp);
  }

  @Override protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.drawLine(0, 0, width, dpToPx(1), paint);
  }
}