最近公司專案中冒出個六邊形的進度條，當時看到有點蒙，和大多數人一樣不知道從哪開始寫，於是和大多數人一樣抱著學習的態度百度了一番，但並沒有具體的例項。但是，也不是沒收穫。在網上找到一篇圓形進度條的案例，我想既然有圓形的，六邊形的我也可以做啊！不就是模仿麼！於是開始了閱讀程式碼，連結是:http://blog.csdn.net/xiaanming/article/details/10298163。第一次寫部落格所以我就直接貼程式碼了，程式碼中的註釋很詳細，我就不過多解釋了。
效果圖如下：


主要程式碼：

package com.sxc.hexagonprogress;

import java.util.Random;
import
 
 android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.Path;
import
 
 android.graphics.RectF;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;


/**
 * 六邊形帶進度的進度條，執行緒安全的View，可直接線上程中更新進度
 * 
 * @author sunxunchao
 *
 */
public class HexagonProgress extends View {
    /**
     * 畫筆物件的引用
     */
    private
 
 Paint paint, mPaint;

    /**
     * 畫筆路徑
     */
    private Path path, mPath;

    /**
     * 環的顏色
     */
    private int roundColor;

    /**
     * 環進度的顏色
     */
    private int roundProgressColor;

    /**
     * 中間進度百分比的字串的顏色
     */
    private int textColor;

    /**
     * 中間進度百分比的字串的字型
     */
    private float textSize;

    /**
     * 環的寬度
     */
    private float roundWidth;

    /**
     * 最大進度
     */
    private double max;

    /**
     * 當前進度
     */
    private double progress;
    /**
     * 是否顯示中間的進度
     */
    private boolean textIsDisplayable;

    /**
     * 進度的風格，實心或者空心
     */
    private int style;

    public static final int STROKE = 0;
    public static final int FILL = 1;

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

    public HexagonProgress(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public HexagonProgress(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        paint = new Paint();
        mPaint = new Paint();

        TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
                R.styleable.HexagonProgressBar);

        // 獲取自定義屬性和預設值
        roundColor = mTypedArray.getColor(
                R.styleable.HexagonProgressBar_hexagonColor, Color.RED);
        roundProgressColor = mTypedArray.getColor(
                R.styleable.HexagonProgressBar_hexagonProgressColor, Color.GREEN);
        textColor = mTypedArray.getColor(
                R.styleable.HexagonProgressBar_textColor, Color.GREEN);
        textSize = mTypedArray.getDimension(
                R.styleable.HexagonProgressBar_textSize, 15);
        roundWidth = mTypedArray.getDimension(
                R.styleable.HexagonProgressBar_hexagonWidth, 5);
        max = mTypedArray.getInteger(R.styleable.HexagonProgressBar_max, 100);
        textIsDisplayable = mTypedArray.getBoolean(
                R.styleable.HexagonProgressBar_textIsDisplayable, true);

        mTypedArray.recycle();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        /**
         * 畫外六邊形
         */
        int centre = getWidth() / 2;// 中心座標
        int radius = (int) (centre - roundWidth / 2);// 六邊形邊長
        mPaint.setColor(roundColor); // 設定圓環的顏色
        mPaint.setStyle(Paint.Style.STROKE); // 設定空心
        mPaint.setStrokeWidth(roundWidth); // 設定圓環的寬度
        mPaint.setAntiAlias(true); // 消除鋸齒
        mPath = new Path();//設定路徑
        // 第一個點座標(centre-radius, getHeight()/2)
        // 第二個點座標(centre-radius/2,getHeight()/2-Math.sqrt(3)*radius/2)
        // 第三個點座標(centre+radius/2,getHeight()/2-Math.sqrt(3)*radius/2)
        // 第四個點座標(centre+radius,getHeight()/2)
        // 第五個點座標 (centre+radius/2,Math.sqrt(3)*radius/2+getHeight()/2)
        // 第六個點座標 (centre-radius/2,Math.sqrt(3)*radius/2+getHeight()/2)
        mPath.moveTo(centre - radius, centre); // A
        mPath.lineTo(centre - radius / 2, (float) (centre - Math.sqrt(3)* radius / 2));// B
        mPath.lineTo(centre + radius / 2, (float) (centre - Math.sqrt(3)* radius / 2));// C
        mPath.lineTo(centre + radius, centre);// D
        mPath.lineTo(centre + radius / 2,(float) ((Math.sqrt(3) * radius / 2) + centre));// E
        mPath.lineTo(centre - radius / 2,(float) ((Math.sqrt(3) * radius / 2) + centre));// F
        mPath.close();
        canvas.drawPath(mPath, mPaint);

        /**
         * 畫進度百分比
         */
        mPaint.setStrokeWidth(0);
        mPaint.setColor(textColor);
        mPaint.setTextSize(textSize);
        mPaint.setTypeface(Typeface.DEFAULT_BOLD); // 設定字型
        int percent = (int) (((float) progress / (float) max) * 100); // 中間的進度百分比，先轉換成float在進行除法運算，不然都為0
        float textWidth = mPaint.measureText(percent + "%"); // 測量字型寬度，我們需要根據字型的寬度設定在圓環中間

        if (textIsDisplayable && style == STROKE) {
            canvas.drawText(percent + "%", centre - textWidth / 2, centre
                    + textSize / 2, mPaint); // 畫出進度百分比
        }

        /**
         * 畫六邊形進度
         */

        path = new Path();
        paint.setStrokeWidth(roundWidth); // 設定圓環的寬度
        paint.setColor(roundProgressColor); // 設定進度的顏色
        paint.setAntiAlias(true);

        double k=  (progress*6) / max;

        paint.setStyle(Paint.Style.STROKE);
            if (k <= 1|| k==0) {
                path.moveTo(centre + radius, centre);
                path.lineTo((float)(centre+radius-k*radius/2), (float) (centre+k*radius*Math.sqrt(3)/2));
            } 
            else if (k>1&&k<=2) {
                path.moveTo(centre + radius, centre); 
                path.lineTo(centre + radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo((float) (centre+1.5*radius-k*radius), (float) (centre+0.5*Math.sqrt(3)*radius));
            }else if (k>2&&k<=3) {
                path.moveTo(centre + radius, centre); 
                path.lineTo(centre + radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre - radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo((float)(centre+0.5*radius-0.5*radius*k), (float) (centre+1.5*Math.sqrt(3)*radius-0.5*k*radius*Math.sqrt(3)));
            }else if (k>3&&k<=4) {
                path.moveTo(centre + radius, centre); 
                path.lineTo(centre + radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre - radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre-radius, centre);
                path.lineTo((float)(centre-radius+0.5*k*radius-1.5*radius), (float) (centre-0.5*(k-3)*radius*Math.sqrt(3)));
            }else if (k>4&&k<=5) {
                path.moveTo(centre + radius, centre); 
                path.lineTo(centre + radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre - radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre - radius, centre);
                path.lineTo(centre - radius / 2, (float) (centre - Math.sqrt(3)* radius / 2));
                path.lineTo((float) ((k-4)*radius+centre-0.5*radius),(float) (centre - Math.sqrt(3)* radius / 2));
            }else if (k>5&&k<6) {
                path.moveTo(centre + radius, centre); 
                path.lineTo(centre + radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre - radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre - radius, centre);
                path.lineTo(centre - radius / 2, (float) (centre - Math.sqrt(3)* radius / 2));
                path.lineTo(centre + radius / 2,(float) (centre - Math.sqrt(3)* radius / 2));
                path.lineTo((float)(centre+0.5*radius+0.5*(k-5)*radius),(float) (centre-0.5*Math.sqrt(3)*radius+0.5*Math.sqrt(3)*(k-5)*radius));
            }else {
                path.moveTo(centre + radius, centre); 
                path.lineTo(centre + radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre - radius / 2, (float) ((Math.sqrt(3) * radius / 2) + centre));
                path.lineTo(centre - radius, centre);
                path.lineTo(centre - radius / 2, (float) (centre - Math.sqrt(3)* radius / 2));
                path.lineTo(centre + radius / 2,(float) (centre - Math.sqrt(3)* radius / 2));
                path.lineTo(centre + radius , centre);
                path.close();
            }

            canvas.drawPath(path, paint);

    }

    public synchronized double getMax() {
        return max;
    }

    /**
     * 設定進度的最大值
     * 
     * @param max
     */
    public synchronized void setMax(int max) {
        if (max < 0) {
            throw new IllegalArgumentException("max not less than 0");
        }
        this.max = max;
    }

    /**
     * 獲取進度.需要同步
     * 
     * @return
     */
    public synchronized double getProgress() {
        return progress;
    }

    /**
     * 設定進度，此為執行緒安全控制元件，由於考慮多線的問題，需要同步 重新整理介面呼叫postInvalidate()能在非UI執行緒重新整理
     * 
     * @param progress
     */
    public synchronized void setProgress(double progress) {
        if (progress < 0) {
            throw new IllegalArgumentException("progress not less than 0");
        }
        if (progress > max) {
            progress = max;
        }
        if (progress <= max) {
            this.progress = progress;
            postInvalidate();
        }

    }

    public int getCricleColor() {
        return roundColor;
    }

    public void setCricleColor(int cricleColor) {
        this.roundColor = cricleColor;
    }

    public int getCricleProgressColor() {
        return roundProgressColor;
    }

    public void setCricleProgressColor(int cricleProgressColor) {
        this.roundProgressColor = cricleProgressColor;
    }

    public int getTextColor() {
        return textColor;
    }

    public void setTextColor(int textColor) {
        this.textColor = textColor;
    }

    public float getTextSize() {
        return textSize;
    }

    public void setTextSize(float textSize) {
        this.textSize = textSize;
    }

    public float getRoundWidth() {
        return roundWidth;
    }

    public void setRoundWidth(float roundWidth) {
        this.roundWidth = roundWidth;
    }

}

在values中新建一個attrs.xml檔案：

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <declare-styleable name="HexagonProgressBar">  
        <attr name="hexagonColor" format="color"/>
        <attr name="hexagonProgressColor" format="color"/>
        <attr name="hexagonWidth" format="dimension"></attr>
        <attr name="textColor" format="color" />  
        <attr name="textSize" format="dimension" /> 
        <attr name="max" format="integer"></attr> 
        <attr name="textIsDisplayable" format="boolean"></attr>
        <!-- <attr name="style">
            <enum name="STROKE" value="0"></enum>
            <enum name="FILL" value="1"></enum>
        </attr> -->
    </declare-styleable> 
</resources>