先上效果圖

微信圖片編輯_20200516150648.jpg

然后上代碼（注釋應(yīng)該蠻清晰了吧，有需要隨便改改就能用咯）

public class ArcChart extends View {
    //外部傳入的比例參數(shù)
    private final float arrPer;
    //RGB顏色數(shù)組 為漸變準(zhǔn)備為數(shù)組厕诡，起始顏色值和終止顏色值
    private final int[] mMinColors = {Color.parseColor("#FF8359"), Color.parseColor("#FFDF40")};

    public ArcChart(Context context, float getArrPer) {
        super(context);
        arrPer = getArrPer;
    }

    public void onDraw(Canvas canvas) {
        DisplayMetrics dm = getResources().getDisplayMetrics();
        int screenWidth = dm.widthPixels;//這里是控件view的寬度懒棉，設(shè)置為了屏幕寬度
        float mMinOvalR = screenWidth / 6f; //圓環(huán)直徑
        float mMinWidth = 90; //圓環(huán)寬度
        float startAngle = 90;//圓弧起始角度
        float degreeCircle = 180;//圓頭位置
        float matrixStart = 90;//漸變旋轉(zhuǎn)角度

        //創(chuàng)建畫筆：
        Paint mMinPaint = new Paint();
        mMinPaint.setColor(Color.parseColor("#F9F9F9"));
        mMinPaint.setAntiAlias(true); //啟用抗鋸齒
        mMinPaint.setDither(true); //啟用抗顏色抖動（可以讓漸變更平緩）
        mMinPaint.setStyle(Paint.Style.STROKE);//圓弧
        mMinPaint.setStrokeWidth(mMinWidth);//圓環(huán)寬度


        //外接矩形
        //算出矩形頂點坐標(biāo)涨冀。
        RectF rect = new RectF(canvas.getWidth() / 2 - mMinOvalR,
                canvas.getHeight() / 2 - mMinOvalR,
                canvas.getWidth() - (canvas.getWidth() / 2 - mMinOvalR),
                canvas.getHeight() - (canvas.getHeight() / 2 - mMinOvalR));
        canvas.drawArc(rect, 0, 360, false, mMinPaint);//先畫一圈背景灰色圓環(huán)
        float degree = 360 * (arrPer / 100); //圓弧掃過的角度
        matrixStart += degree;//漸變旋轉(zhuǎn)角度要開始計算
        //創(chuàng)建漸變
        SweepGradient mSweepGradient = new SweepGradient(canvas.getWidth() / 2,
                canvas.getHeight() / 2,
                mMinColors,
                new float[]{0f, degree});
        Matrix matrix = new Matrix();//將漸變旋轉(zhuǎn)
        matrix.setRotate(matrixStart, canvas.getWidth() / 2, canvas.getHeight() / 2);
        mSweepGradient.setLocalMatrix(matrix);
        //把漸變設(shè)置到筆刷
        mMinPaint.setShader(mSweepGradient);
        //畫漸變的弧
        canvas.drawArc(rect, startAngle, degree, false, mMinPaint);
        //記錄下位置
        float[] arrayInt = {0, arrPer};
        //獲取漸變弧結(jié)束點的顏色值和漸變的開始值
        int[] newColor = {Color.rgb(255,
                (int) (223 + (-0.92 * arrPer)), (int) (64 + (0.25 * arrPer))), mMinColors[1]};
        //畫圓弧開始和結(jié)束的圓點
        for (int i = 0; i < 2; i++) {
            Paint mMinCirclePaint = new Paint();//定義頭部畫筆
            mMinCirclePaint.setColor(newColor[i]);//取顏色值
            mMinCirclePaint.setAntiAlias(true);//啟用抗鋸齒
            degreeCircle += 360 * (arrayInt[i] / 100); //圓位置等于圓弧長度
            float mDegreeCircle = degreeCircle - 90;//抵消屏幕坐標(biāo)系差異
            mDegreeCircle = (float) (Math.PI / 180f * mDegreeCircle); //換成弧度
            canvas.drawCircle((float) (rect.left + rect.width() / 2f + mMinOvalR * Math.cos(mDegreeCircle)), //圓心x
                    (float) (rect.top + rect.height() / 2f + mMinOvalR * Math.sin(mDegreeCircle)), //圓心y
                    mMinWidth / 2f,  //半徑
                    mMinCirclePaint);
        }
    }
}

使用的時候直接new ArcChart(this, 0.5f);就行啦

主要是用SweepGradient來疊加漸變色劳闹，但是我發(fā)現(xiàn)似乎少于360度的圓弧無法根據(jù)傳入的顏色值進行完全的漸變碾牌，所以我上面代碼只能通過獲取圓弧結(jié)束點的顏色值來達到結(jié)束點的圓角效果

要是有人知道怎么解決這個問題麻煩留言告知一下哦