/**中心點的x坐標*/float centerX = (getWidth()) / 2;

/**指定圓弧的外輪廓矩形區域*/RectF rectF = new RectF(0 + borderWidth, borderWidth, 2 * centerX - borderWidth, 2 * centerX - borderWidth);

/*** 1.繪制總步數的黃色圓弧** @param canvas 畫筆* @param rectF 參考的矩形*/private void drawArcYellow(Canvas canvas, RectF rectF) {Paint paint = new Paint();/** 默認畫筆顏色，黃色 */paint.setColor(getResources().getColor(R.color.yellow));/** 結合處為圓弧*/paint.setStrokeJoin(Paint.Join.ROUND);/** 設置畫筆的樣式 Paint.Cap.Round ,Cap.SQUARE等分別為圓形、方形*/paint.setStrokeCap(Paint.Cap.ROUND);/** 設置畫筆的填充樣式 Paint.Style.FILL :填充內部;Paint.Style.FILL_AND_STROKE ：填充內部和描邊; Paint.Style.STROKE ：僅描邊*/paint.setStyle(Paint.Style.STROKE);/**抗鋸齒功能*/paint.setAntiAlias(true);/**設置畫筆寬度*/paint.setStrokeWidth(borderWidth);/**繪制圓弧的方法* drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint)//畫弧，參數一是RectF對象，一個矩形區域橢圓形的界限用于定義在形狀、大小、電弧，參數二是起始角(度)在電弧的開始，圓弧起始角度，單位為度。參數三圓弧掃過的角度，順時針方向，單位為度,從右中間開始為零度。參數四是如果這是true(真)的話,在繪制圓弧時將圓心包括在內，通常用來繪制扇形；如果它是false(假)這將是一個弧線,參數五是Paint對象；*/canvas.drawArc(rectF, startAngle, angleLength, false, paint);}

/*** 2.繪制當前步數的紅色圓弧*/private void drawArcRed(Canvas canvas, RectF rectF) {Paint paintCurrent = new Paint();paintCurrent.setStrokeJoin(Paint.Join.ROUND);paintCurrent.setStrokeCap(Paint.Cap.ROUND);//圓角弧度paintCurrent.setStyle(Paint.Style.STROKE);//設置填充樣式paintCurrent.setAntiAlias(true);//抗鋸齒功能paintCurrent.setStrokeWidth(borderWidth);//設置畫筆寬度paintCurrent.setColor(getResources().getColor(R.color.red));//設置畫筆顏色canvas.drawArc(rectF, startAngle, currentAngleLength, false, paintCurrent);}

/*** 3.圓環中心的步數*/private void drawTextNumber(Canvas canvas, float centerX) {Paint vTextPaint = new Paint();vTextPaint.setTextAlign(Paint.Align.CENTER);vTextPaint.setAntiAlias(true);//抗鋸齒功能vTextPaint.setTextSize(numberTextSize);Typeface font = Typeface.create(Typeface.SANS_SERIF, Typeface.NORMAL);vTextPaint.setTypeface(font);//字體風格vTextPaint.setColor(getResources().getColor(R.color.red));Rect bounds_Number = new Rect();vTextPaint.getTextBounds(stepNumber, 0, stepNumber.length(), bounds_Number);canvas.drawText(stepNumber, centerX, getHeight() / 2 + bounds_Number.height() / 2, vTextPaint);}

/*** 4.圓環中心[步數]的文字*/private void drawTextStepString(Canvas canvas, float centerX) {Paint vTextPaint = new Paint();vTextPaint.setTextSize(dipToPx(16));vTextPaint.setTextAlign(Paint.Align.CENTER);vTextPaint.setAntiAlias(true);//抗鋸齒功能vTextPaint.setColor(getResources().getColor(R.color.grey));String stepString = "步數";Rect bounds = new Rect();vTextPaint.getTextBounds(stepString, 0, stepString.length(), bounds);canvas.drawText(stepString, centerX, getHeight() / 2 + bounds.height() + getFontHeight(numberTextSize), vTextPaint);}

/*為進度設置動畫* @param start 初始值* @param current 結束值* @param length 動畫時長*/private void setAnimation(float start, float current, int length) {ValueAnimator progressAnimator = ValueAnimator.ofFloat(start, current);progressAnimator.setDuration(length);progressAnimator.setTarget(currentAngleLength);progressAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {/**每次在初始值和結束值之間產生的一個平滑過渡的值，逐步去更新進度*/currentAngleLength = (float) animation.getAnimatedValue();invalidate();}});progressAnimator.start();}

import android.animation.ValueAnimator;import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Typeface;import android.util.AttributeSet;import android.view.View;import cn.bluemobi.dylan.step.R;/*** Created by DylanAndroid on 2016/5/26.* 顯示步數的圓弧*/public class StepArcView extends View {/*** 圓弧的寬度*/private float borderWidth = 38f;/*** 畫步數的數值的字體大小*/private float numberTextSize = 0;/*** 步數*/private String stepNumber = "0";/*** 開始繪制圓弧的角度*/private float startAngle = 135;/*** 終點對應的角度和起始點對應的角度的夾角*/private float angleLength = 270;/*** 所要繪制的當前步數的紅色圓弧終點到起點的夾角*/private float currentAngleLength = 0;/*** 動畫時長*/private int animationLength = 3000;public StepArcView(Context context) {super(context);}public StepArcView(Context context, AttributeSet attrs) {super(context, attrs);}public StepArcView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);/**中心點的x坐標*/float centerX = (getWidth()) / 2;/**指定圓弧的外輪廓矩形區域*/RectF rectF = new RectF(0 + borderWidth, borderWidth, 2 * centerX - borderWidth, 2 * centerX - borderWidth);/**【第一步】繪制整體的黃色圓弧*/drawArcYellow(canvas, rectF);/**【第二步】繪制當前進度的紅色圓弧*/drawArcRed(canvas, rectF);/**【第三步】繪制當前進度的紅色數字*/drawTextNumber(canvas, centerX);/**【第四步】繪制"步數"的紅色數字*/drawTextStepString(canvas, centerX);}/*** 1.繪制總步數的黃色圓弧** @param canvas 畫筆* @param rectF 參考的矩形*/private void drawArcYellow(Canvas canvas, RectF rectF) {Paint paint = new Paint();/** 默認畫筆顏色，黃色 */paint.setColor(getResources().getColor(R.color.yellow));/** 結合處為圓弧*/paint.setStrokeJoin(Paint.Join.ROUND);/** 設置畫筆的樣式 Paint.Cap.Round ,Cap.SQUARE等分別為圓形、方形*/paint.setStrokeCap(Paint.Cap.ROUND);/** 設置畫筆的填充樣式 Paint.Style.FILL :填充內部;Paint.Style.FILL_AND_STROKE ：填充內部和描邊; Paint.Style.STROKE ：僅描邊*/paint.setStyle(Paint.Style.STROKE);/**抗鋸齒功能*/paint.setAntiAlias(true);/**設置畫筆寬度*/paint.setStrokeWidth(borderWidth);/**繪制圓弧的方法* drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint)//畫弧，參數一是RectF對象，一個矩形區域橢圓形的界限用于定義在形狀、大小、電弧，參數二是起始角(度)在電弧的開始，圓弧起始角度，單位為度。參數三圓弧掃過的角度，順時針方向，單位為度,從右中間開始為零度。參數四是如果這是true(真)的話,在繪制圓弧時將圓心包括在內，通常用來繪制扇形；如果它是false(假)這將是一個弧線,參數五是Paint對象；*/canvas.drawArc(rectF, startAngle, angleLength, false, paint);}/*** 2.繪制當前步數的紅色圓弧*/private void drawArcRed(Canvas canvas, RectF rectF) {Paint paintCurrent = new Paint();paintCurrent.setStrokeJoin(Paint.Join.ROUND);paintCurrent.setStrokeCap(Paint.Cap.ROUND);//圓角弧度paintCurrent.setStyle(Paint.Style.STROKE);//設置填充樣式paintCurrent.setAntiAlias(true);//抗鋸齒功能paintCurrent.setStrokeWidth(borderWidth);//設置畫筆寬度paintCurrent.setColor(getResources().getColor(R.color.red));//設置畫筆顏色canvas.drawArc(rectF, startAngle, currentAngleLength, false, paintCurrent);}/*** 3.圓環中心的步數*/private void drawTextNumber(Canvas canvas, float centerX) {Paint vTextPaint = new Paint();vTextPaint.setTextAlign(Paint.Align.CENTER);vTextPaint.setAntiAlias(true);//抗鋸齒功能vTextPaint.setTextSize(numberTextSize);Typeface font = Typeface.create(Typeface.SANS_SERIF, Typeface.NORMAL);vTextPaint.setTypeface(font);//字體風格vTextPaint.setColor(getResources().getColor(R.color.red));Rect bounds_Number = new Rect();vTextPaint.getTextBounds(stepNumber, 0, stepNumber.length(), bounds_Number);canvas.drawText(stepNumber, centerX, getHeight() / 2 + bounds_Number.height() / 2, vTextPaint);}/*** 4.圓環中心[步數]的文字*/private void drawTextStepString(Canvas canvas, float centerX) {Paint vTextPaint = new Paint();vTextPaint.setTextSize(dipToPx(16));vTextPaint.setTextAlign(Paint.Align.CENTER);vTextPaint.setAntiAlias(true);//抗鋸齒功能vTextPaint.setColor(getResources().getColor(R.color.grey));String stepString = "步數";Rect bounds = new Rect();vTextPaint.getTextBounds(stepString, 0, stepString.length(), bounds);canvas.drawText(stepString, centerX, getHeight() / 2 + bounds.height() + getFontHeight(numberTextSize), vTextPaint);}/*** 獲取當前步數的數字的高度** @param fontSize 字體大小* @return 字體高度*/public int getFontHeight(float fontSize) {Paint paint = new Paint();paint.setTextSize(fontSize);Rect bounds_Number = new Rect();paint.getTextBounds(stepNumber, 0, stepNumber.length(), bounds_Number);return bounds_Number.height();}/*** dip 轉換成px** @param dip* @return*/private int dipToPx(float dip) {float density = getContext().getResources().getDisplayMetrics().density;return (int) (dip * density + 0.5f * (dip >= 0 ? 1 : -1));}/*** 所走的步數進度** @param totalStepNum 設置的步數* @param currentCounts 所走步數*/public void setCurrentCount(int totalStepNum, int currentCounts) {stepNumber = currentCounts + "";setTextSize(currentCounts);/**如果當前走的步數超過總步數則圓弧還是270度，不能成為園*/if (currentCounts > totalStepNum) {currentCounts = totalStepNum;}/**所走步數占用總共步數的百分比*/float scale = (float) currentCounts / totalStepNum;/**換算成弧度最后要到達的角度的長度-->弧長*/float currentAngleLength = scale * angleLength;/**開始執行動畫*/setAnimation(0, currentAngleLength, animationLength);}/*** 為進度設置動畫* ValueAnimator是整個屬性動畫機制當中最核心的一個類，屬性動畫的運行機制是通過不斷地對值進行操作來實現的，* 而初始值和結束值之間的動畫過渡就是由ValueAnimator這個類來負責計算的。* 它的內部使用一種時間循環的機制來計算值與值之間的動畫過渡，* 我們只需要將初始值和結束值提供給ValueAnimator，并且告訴它動畫所需運行的時長，* 那么ValueAnimator就會自動幫我們完成從初始值平滑地過渡到結束值這樣的效果。** @param last* @param current*/private void setAnimation(float last, float current, int length) {ValueAnimator progressAnimator = ValueAnimator.ofFloat(last, current);progressAnimator.setDuration(length);progressAnimator.setTarget(currentAngleLength);progressAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {currentAngleLength = (float) animation.getAnimatedValue();invalidate();}});progressAnimator.start();}/*** 設置文本大小,防止步數特別大之后放不下，將字體大小動態設置** @param num*/public void setTextSize(int num) {String s = String.valueOf(num);int length = s.length();if (length <= 4) {numberTextSize = dipToPx(50);} else if (length > 4 && length <= 6) {numberTextSize = dipToPx(40);} else if (length > 6 && length <= 8) {numberTextSize = dipToPx(30);} else if (length > 8) {numberTextSize = dipToPx(25);}}}

<cn.bluemobi.dylan.step.view.StepArcViewandroid:id="@+id/sv "android:layout_width="200dp"android:layout_height="200dp"android:layout_centerHorizontal="true"android:layout_marginTop="50dp" />

StepArcView sv = (StepArcView) findViewById(R.id.sv);sv.setCurrentCount(7000, 1000);