Android 自定View实现仿QQ运动步数圆弧及动画效果

/**中心点的x坐标*/float centerX = (getWidth()) / 2;

/**指定圆弧的外轮廓矩形区域*/RectF rectF = new RectF(0 + borderWidth, borderWidth, 2 * centerX - borderWidth, 2 * centerX - borderWidth);

/*** 1.绘制总步数的黄色圆弧** @param canvas 画笔* @param rectF 参考的矩形*/private void drawArcYellow(Canvas canvas, RectF rectF) {Paint paint = new Paint();/** 默认画笔颜色，黄色 */paint.setColor(getResources().getColor(R.color.yellow));/** 结合处为圆弧*/paint.setStrokeJoin(Paint.Join.ROUND);/** 设置画笔的样式 Paint.Cap.Round ,Cap.SQUARE等分别为圆形、方形*/paint.setStrokeCap(Paint.Cap.ROUND);/** 设置画笔的填充样式 Paint.Style.FILL :填充内部;Paint.Style.FILL_AND_STROKE ：填充内部和描边; Paint.Style.STROKE ：仅描边*/paint.setStyle(Paint.Style.STROKE);/**抗锯齿功能*/paint.setAntiAlias(true);/**设置画笔宽度*/paint.setStrokeWidth(borderWidth);/**绘制圆弧的方法* drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint)//画弧，参数一是RectF对象，一个矩形区域椭圆形的界限用于定义在形状、大小、电弧，参数二是起始角(度)在电弧的开始，圆弧起始角度，单位为度。参数三圆弧扫过的角度，顺时针方向，单位为度,从右中间开始为零度。参数四是如果这是true(真)的话,在绘制圆弧时将圆心包括在内，通常用来绘制扇形；如果它是false(假)这将是一个弧线,参数五是Paint对象；*/canvas.drawArc(rectF, startAngle, angleLength, false, paint);}

/*** 2.绘制当前步数的红色圆弧*/private void drawArcRed(Canvas canvas, RectF rectF) {Paint paintCurrent = new Paint();paintCurrent.setStrokeJoin(Paint.Join.ROUND);paintCurrent.setStrokeCap(Paint.Cap.ROUND);//圆角弧度paintCurrent.setStyle(Paint.Style.STROKE);//设置填充样式paintCurrent.setAntiAlias(true);//抗锯齿功能paintCurrent.setStrokeWidth(borderWidth);//设置画笔宽度paintCurrent.setColor(getResources().getColor(R.color.red));//设置画笔颜色canvas.drawArc(rectF, startAngle, currentAngleLength, false, paintCurrent);}

/*** 3.圆环中心的步数*/private void drawTextNumber(Canvas canvas, float centerX) {Paint vTextPaint = new Paint();vTextPaint.setTextAlign(Paint.Align.CENTER);vTextPaint.setAntiAlias(true);//抗锯齿功能vTextPaint.setTextSize(numberTextSize);Typeface font = Typeface.create(Typeface.SANS_SERIF, Typeface.NORMAL);vTextPaint.setTypeface(font);//字体风格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.圆环中心[步数]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);//抗锯齿功能vTextPaint.setColor(getResources().getColor(R.color.grey));String stepString = "步数";Rect bounds = new Rect();vTextPaint.getTextBounds(stepString, 0, stepString.length(), bounds);canvas.drawText(stepString, centerX, getHeight() / 2 + bounds.height() + getFontHeight(numberTextSize), vTextPaint);}

/*为进度设置动画* @param start 初始值* @param current 结束值* @param length 动画时长*/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) {/**每次在初始值和结束值之间产生的一个平滑过渡的值，逐步去更新进度*/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.* 显示步数的圆弧*/public class StepArcView extends View {/*** 圆弧的宽度*/private float borderWidth = 38f;/*** 画步数的数值的字体大小*/private float numberTextSize = 0;/*** 步数*/private String stepNumber = "0";/*** 开始绘制圆弧的角度*/private float startAngle = 135;/*** 终点对应的角度和起始点对应的角度的夹角*/private float angleLength = 270;/*** 所要绘制的当前步数的红色圆弧终点到起点的夹角*/private float currentAngleLength = 0;/*** 动画时长*/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);/**中心点的x坐标*/float centerX = (getWidth()) / 2;/**指定圆弧的外轮廓矩形区域*/RectF rectF = new RectF(0 + borderWidth, borderWidth, 2 * centerX - borderWidth, 2 * centerX - borderWidth);/**【第一步】绘制整体的黄色圆弧*/drawArcYellow(canvas, rectF);/**【第二步】绘制当前进度的红色圆弧*/drawArcRed(canvas, rectF);/**【第三步】绘制当前进度的红色数字*/drawTextNumber(canvas, centerX);/**【第四步】绘制"步数"的红色数字*/drawTextStepString(canvas, centerX);}/*** 1.绘制总步数的黄色圆弧** @param canvas 画笔* @param rectF 参考的矩形*/private void drawArcYellow(Canvas canvas, RectF rectF) {Paint paint = new Paint();/** 默认画笔颜色，黄色 */paint.setColor(getResources().getColor(R.color.yellow));/** 结合处为圆弧*/paint.setStrokeJoin(Paint.Join.ROUND);/** 设置画笔的样式 Paint.Cap.Round ,Cap.SQUARE等分别为圆形、方形*/paint.setStrokeCap(Paint.Cap.ROUND);/** 设置画笔的填充样式 Paint.Style.FILL :填充内部;Paint.Style.FILL_AND_STROKE ：填充内部和描边; Paint.Style.STROKE ：仅描边*/paint.setStyle(Paint.Style.STROKE);/**抗锯齿功能*/paint.setAntiAlias(true);/**设置画笔宽度*/paint.setStrokeWidth(borderWidth);/**绘制圆弧的方法* drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint)//画弧，参数一是RectF对象，一个矩形区域椭圆形的界限用于定义在形状、大小、电弧，参数二是起始角(度)在电弧的开始，圆弧起始角度，单位为度。参数三圆弧扫过的角度，顺时针方向，单位为度,从右中间开始为零度。参数四是如果这是true(真)的话,在绘制圆弧时将圆心包括在内，通常用来绘制扇形；如果它是false(假)这将是一个弧线,参数五是Paint对象；*/canvas.drawArc(rectF, startAngle, angleLength, false, paint);}/*** 2.绘制当前步数的红色圆弧*/private void drawArcRed(Canvas canvas, RectF rectF) {Paint paintCurrent = new Paint();paintCurrent.setStrokeJoin(Paint.Join.ROUND);paintCurrent.setStrokeCap(Paint.Cap.ROUND);//圆角弧度paintCurrent.setStyle(Paint.Style.STROKE);//设置填充样式paintCurrent.setAntiAlias(true);//抗锯齿功能paintCurrent.setStrokeWidth(borderWidth);//设置画笔宽度paintCurrent.setColor(getResources().getColor(R.color.red));//设置画笔颜色canvas.drawArc(rectF, startAngle, currentAngleLength, false, paintCurrent);}/*** 3.圆环中心的步数*/private void drawTextNumber(Canvas canvas, float centerX) {Paint vTextPaint = new Paint();vTextPaint.setTextAlign(Paint.Align.CENTER);vTextPaint.setAntiAlias(true);//抗锯齿功能vTextPaint.setTextSize(numberTextSize);Typeface font = Typeface.create(Typeface.SANS_SERIF, Typeface.NORMAL);vTextPaint.setTypeface(font);//字体风格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.圆环中心[步数]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);//抗锯齿功能vTextPaint.setColor(getResources().getColor(R.color.grey));String stepString = "步数";Rect bounds = new Rect();vTextPaint.getTextBounds(stepString, 0, stepString.length(), bounds);canvas.drawText(stepString, centerX, getHeight() / 2 + bounds.height() + getFontHeight(numberTextSize), vTextPaint);}/*** 获取当前步数的数字的高度** @param fontSize 字体大小* @return 字体高度*/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 转换成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));}/*** 所走的步数进度** @param totalStepNum 设置的步数* @param currentCounts 所走步数*/public void setCurrentCount(int totalStepNum, int currentCounts) {stepNumber = currentCounts + "";setTextSize(currentCounts);/**如果当前走的步数超过总步数则圆弧还是270度，不能成为园*/if (currentCounts > totalStepNum) {currentCounts = totalStepNum;}/**所走步数占用总共步数的百分比*/float scale = (float) currentCounts / totalStepNum;/**换算成弧度最后要到达的角度的长度-->弧长*/float currentAngleLength = scale * angleLength;/**开始执行动画*/setAnimation(0, currentAngleLength, animationLength);}/*** 为进度设置动画* ValueAnimator是整个属性动画机制当中最核心的一个类，属性动画的运行机制是通过不断地对值进行操作来实现的，* 而初始值和结束值之间的动画过渡就是由ValueAnimator这个类来负责计算的。* 它的内部使用一种时间循环的机制来计算值与值之间的动画过渡，* 我们只需要将初始值和结束值提供给ValueAnimator，并且告诉它动画所需运行的时长，* 那么ValueAnimator就会自动帮我们完成从初始值平滑地过渡到结束值这样的效果。** @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();}/*** 设置文本大小,防止步数特别大之后放不下，将字体大小动态设置** @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);