自定义视图onDraw drawCircle方法不起作用？

Question

我正在跟踪教程链接“ https://code.tutsplus.com/tutorials/android-sdk-creating-custom-views--mobile-14548”，但无法为圆圈上色。我创建了一个自定义视图LovelyView，并尝试在onDraw方法上对其进行充气。

Lovelyview是自定义视图，并为custom：circleColor分配了颜色

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:custom="http://schemas.android.com/apk/res-com.example.narroju.lovelyactivity"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LovelyActivity">


    <com.example.narroju.lovelyactivity.LovelyView
        android:id="@+id/custView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_margin="5dp"
        custom:circleColor="#ff0099"
        custom:circleLabel="Hello"
        custom:labelColor="#ffff66" />

</RelativeLayout>

在可爱的活动中，我无法使circlecolor的drawCircle颜色膨胀

package com.example.narroju.lovelyactivity;

import android.content.Context;
import android.view.View;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.view.View;


public class LovelyView extends View {
    //circle and text colors
    private int circleCol, labelCol;
    //label text
    private String circleText;
    //paint for drawing custom view
    private Paint circlePaint;


    public LovelyView(Context context, AttributeSet attrs) {
        super(context, attrs);

        //paint object for drawing in onDraw
        circlePaint = new Paint();

        //get the attributes specified in attrs.xml using the name we included
        TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
                R.styleable.LovelyView, 0, 0);

        try {
            //get the text and colors specified using the names in attrs.xml
            circleText = a.getString(R.styleable.LovelyView_circleLabel);
            circleCol = a.getInteger(R.styleable.LovelyView_circleColor, 0);//0 is default
            labelCol = a.getInteger(R.styleable.LovelyView_labelColor, 0);
        } finally {
            a.recycle();
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        //draw the View

        super.onDraw(canvas);
        //get half of the width and height as we are working with a circle
        int viewWidthHalf = this.getMeasuredWidth() / 2;
        int viewHeightHalf = this.getMeasuredHeight() / 2;

        //get the radius as half of the width or height, whichever is smaller
//subtract ten so that it has some space around it
        int radius = 0;
        if (viewWidthHalf > viewHeightHalf)
            radius = viewHeightHalf - 10;
        else
            radius = viewWidthHalf - 10;

        circlePaint.setStyle(Style.FILL);
        circlePaint.setAntiAlias(true);

        //set the paint color using the circle color specified
        circlePaint.setColor(circleCol);

        canvas.drawCircle(viewWidthHalf, viewHeightHalf, radius, circlePaint);


    }


}