Andoid CustomCircleProgress 半圆

package com.play.playgame.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by admin on 2017/8/10.
 */

public class CustomCircleProgress extends View {

    private Paint mPaint;
    private Context context;

    /**
     * 圆的宽度
     */
    private int mCircleWidth = 3;

    public CustomCircleProgress(Context context) {
        this(context, null);
    }

    public CustomCircleProgress(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
        this.context = context;
    }

    public CustomCircleProgress(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mPaint = new Paint();
    }


    protected void onDraw(Canvas canvas) {
        mPaint.setAntiAlias(true);//取消锯齿
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(mCircleWidth);
        mPaint.setColor(Color.parseColor("#BEBEBE"));

        /**
         * 这是一个居中的圆
         */
        RectF oval = new RectF(0, 0,
                2*getWidth(), getHeight());

        canvas.drawArc(oval, 90, 180, false, mPaint);

    }
}