先看下iOS的芝麻信用分截圖
這是我做的效果，還是有點差距的
支付寶9.9版本芝麻信用分的實現
首先初始化各種畫筆,默認的size，padding，小圓點.
(因為實在找不到原版芝麻信用的帶點模糊效果的小圓點,所以只好用這個代替)
//View的默認大小defaultSize = dp2px(250);//默認Padding大小arcDistance = dp2px(14);//外層圓環畫筆mMiddleArcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mMiddleArcPaint.setStrokeWidth(8);mMiddleArcPaint.setColor(Color.WHITE);mMiddleArcPaint.setStyle(Paint.Style.STROKE);mMiddleArcPaint.setAlpha(80);//內層圓環畫筆mInnerArcPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mInnerArcPaint.setStrokeWidth(30);mInnerArcPaint.setColor(Color.WHITE);mInnerArcPaint.setAlpha(80);mInnerArcPaint.setStyle(Paint.Style.STROKE);//正中間字體畫筆mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mTextPaint.setColor(Color.WHITE);mTextPaint.setTextAlign(Paint.Align.CENTER);//圓環大刻度畫筆mCalibrationPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mCalibrationPaint.setStrokeWidth(4);mCalibrationPaint.setStyle(Paint.Style.STROKE);mCalibrationPaint.setColor(Color.WHITE);mCalibrationPaint.setAlpha(120);//圓環小刻度畫筆mSmallCalibrationPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mSmallCalibrationPaint.setStrokeWidth(1);mSmallCalibrationPaint.setStyle(Paint.Style.STROKE);mSmallCalibrationPaint.setColor(Color.WHITE);mSmallCalibrationPaint.setAlpha(130);//圓環刻度文本畫筆mCalibrationTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mCalibrationTextPaint.setTextSize(30);mCalibrationTextPaint.setColor(Color.WHITE);//外層進度畫筆mArcProgressPaint = new Paint(Paint.ANTI_ALIAS_FLAG);mArcProgressPaint.setStrokeWidth(8);mArcProgressPaint.setColor(Color.WHITE);mArcProgressPaint.setStyle(Paint.Style.STROKE);mArcProgressPaint.setStrokeCap(Paint.Cap.ROUND);//外層圓環上小圓點Bitmap畫筆mBitmapPaint = new Paint();mBitmapPaint.setStyle(Paint.Style.FILL);mBitmapPaint.setAntiAlias(true);//初始化小圓點圖片bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_circle);//當前點的實際位置pos = new float[2];//當前點的tangent值tan = new float[2];matrix = new Matrix();
代碼很簡單,就是各種初始化,往下看.
View的測量,主要在給設置warp_content時候給定一個默認寬高值.
@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){ setMeasuredDimension(resolveMeasure(widthMeasureSpec, defaultSize), resolveMeasure(heightMeasureSpec, defaultSize));}//根據傳入的值進行測量public int resolveMeasure(int measureSpec, int defaultSize){ int result = 0; int specSize = MeasureSpec.getSize(measureSpec); switch (MeasureSpec.getMode(measureSpec)) { case MeasureSpec.UNSPECIFIED: result = defaultSize; break; case MeasureSpec.AT_MOST: //設置warp_content時設置默認值 result = Math.min(specSize, defaultSize); break; case MeasureSpec.EXACTLY: //設置math_parent 和設置了固定寬高值 break; default: result = defaultSize; } return result;}然后確定View的寬高后的回調方法.
@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh){ super.onSizeChanged(w, h, oldw, oldh); width = w; height = h; radius = width / 2; //外層圓環矩形 mMiddleRect = new RectF(defaultPadding, defaultPadding,width - defaultPadding, height - defaultPadding); //內層圓環矩形 mInnerRect = new RectF(defaultPadding + arcDistance, defaultPadding + arcDistance,width - defaultPadding - arcDistance, height - defaultPadding - arcDistance); // 外層進度矩形 mMiddleProgressRect = new RectF(defaultPadding, defaultPadding,width - defaultPadding, height - defaultPadding);}這里就是初始化圓弧所需要的矩形實現,下邊開始進行重點,繪制，
繪制外層的圓弧,很簡單, 圓弧的起始角度,角度.
private void drawMiddleArc(Canvas canvas){ canvas.drawArc(mMiddleRect, mStartAngle, mEndAngle, false, mMiddleArcPaint);}繪制內層圓弧
private void drawInnerArc(Canvas canvas){ canvas.drawArc(mInnerRect, mStartAngle, mEndAngle, false, mInnerArcPaint);}繪制內層圓弧上的小刻度,畫布旋轉到圓弧左下角起點,計算出每條刻度線的起始點后,整個圓弧是210度,
每6角度繪制一條刻度線.
private void drawSmallCalibration(Canvas canvas){ //旋轉畫布 canvas.save(); canvas.rotate(-105, radius, radius); //計算刻度線的起點結束點 int startDst = (int) (defaultPadding + arcDistance - mInnerArcPaint.getStrokeWidth() / 2 - 1); int endDst = (int) (startDst + mInnerArcPaint.getStrokeWidth()); for (int i = 0; i <= 35; i++) { //每旋轉6度繪制一個小刻度 canvas.drawLine(radius, startDst, radius, endDst, mSmallCalibrationPaint); canvas.rotate(6, radius, radius); } canvas.restore();}繪制內層圓弧上的大刻度,350, 550, 600,650, 700, 950，對應的信用分值,
一樣旋轉畫布,計算刻度線的起始點,計算出每次旋轉的角度,每35度旋轉一次,依次繪制對應的大刻度線,
然后繪制對應的文本內容,使用paint的measureText方法測量出文本的長度,依次繪制對應的文本內容.
private void drawCalibrationAndText(Canvas canvas){ //旋轉畫布進行繪制對應的刻度 canvas.save(); canvas.rotate(-105, radius, radius); //計算刻度線的起點結束點 int startDst = (int) (defaultPadding + arcDistance - mInnerArcPaint.getStrokeWidth() / 2 - 1); int endDst = (int) (startDst + mInnerArcPaint.getStrokeWidth()); //刻度旋轉的角度 int rotateAngle = 210 / 10; for (int i = 1; i < 12; i++) { if (i % 2 != 0) { canvas.drawLine(radius, startDst, radius, endDst, mCalibrationPaint); } // 測量文本的長度 float textLen = mCalibrationTextPaint.measureText(sesameStr[i - 1]); canvas.drawText(sesameStr[i - 1], radius - textLen / 2, endDst + 40, mCalibrationTextPaint); canvas.rotate(rotateAngle, radius, radius); } canvas.restore();}繪制中間的信用分值,信用等級,評估時間等文本,這個比較簡單,直接drawText,依次高低排列繪制即可.
private void drawCenterText(Canvas canvas){ //繪制Logo mTextPaint.setTextSize(30); canvas.drawText("BETA", radius, radius - 130, mTextPaint); //繪制信用分數 mTextPaint.setTextSize(200); mTextPaint.setStyle(Paint.Style.STROKE); canvas.drawText(String.valueOf(mMinNum), radius, radius + 70, mTextPaint); //繪制信用級別 mTextPaint.setTextSize(80); canvas.drawText(sesameLevel, radius, radius + 160, mTextPaint); //繪制評估時間 mTextPaint.setTextSize(30); canvas.drawText(evaluationTime, radius, radius + 205, mTextPaint);}繪制最外層的進度,這里使用的Path添加要繪制的圓弧,因為需要去不斷的計算坐標點,主要用到了PathMeasure這個類,將繪制的圓弧加入到path中,
當前點的實際位置
private float[] pos;
當前的tangent值
private float[] tan;
獲取路徑的終點的正切值和坐標，然后根據坐標點繪制小圓點
PathMeasure pathMeasure = new PathMeasure(path, false);pathMeasure.getPosTan(pathMeasure.getLength() * 1, pos, tan);
private void drawRingProgress(Canvas canvas){ Path path = new Path(); path.addArc(mMiddleProgressRect, mStartAngle, mCurrentAngle); PathMeasure pathMeasure = new PathMeasure(path, false); pathMeasure.getPosTan(pathMeasure.getLength() * 1, pos, tan); matrix.reset(); matrix.postTranslate(pos[0] - bitmap.getWidth() / 2, pos[1] - bitmap.getHeight() / 2); canvas.drawPath(path, mArcProgressPaint); //起始角度不為0時候才進行繪制小圓點 if (mCurrentAngle == 0) return; canvas.drawBitmap(bitmap, matrix, mBitmapPaint); mBitmapPaint.setColor(Color.WHITE); canvas.drawCircle(pos[0], pos[1], 8, mBitmapPaint);}好了,到這里所有繪制完畢了,接下來讓圓弧進度條動起來吧,使用ValueAnimator,進度條動畫定義了圓弧進度條的開始角度mCurrentAngle,圓弧角度mTotalAngle,數值動畫定義了初始化minNum=0，maxNum根據傳入的數值進行計算.
public void startAnim(){ ValueAnimator mAngleAnim = ValueAnimator.ofFloat(mCurrentAngle, mTotalAngle); mAngleAnim.setInterpolator(new AccelerateDecelerateInterpolator()); mAngleAnim.setDuration(3000); mAngleAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener(){ @Override public void onAnimationUpdate(ValueAnimator valueAnimator){ mCurrentAngle = (float) valueAnimator.getAnimatedValue(); postInvalidate(); } }); mAngleAnim.start(); ValueAnimator mNumAnim = ValueAnimator.ofInt(mMinNum, mMaxNum); mNumAnim.setDuration(3000); mNumAnim.setInterpolator(new LinearInterpolator()); mNumAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator){ mMinNum = (int) valueAnimator.getAnimatedValue(); postInvalidate(); } }); mNumAnim.start();}最后根據傳入的信用分值計算圓弧進度條所到的角度.
public void setSesameValues(int values){ if (values <= 350){ mMaxNum = values; mTotalAngle = 0f; sesameLevel = "信用較差"; evaluationTime = "評估時間:" + getCurrentTime(); } else if (values <= 550){ mMaxNum = values; mTotalAngle = (values - 350) * 80 / 400f + 2; sesameLevel = "信用較差"; evaluationTime = "評估時間:" + getCurrentTime(); } else if (values <= 700) { mMaxNum = values; if (values > 550 && values <= 600){ sesameLevel = "信用中等"; } else if (values > 600 && values <= 650){ sesameLevel = "信用良好"; } else { sesameLevel = "信用優秀"; } mTotalAngle = (values - 550) * 120 / 150f + 43; evaluationTime = "評估時間:" + getCurrentTime(); } else if (values <= 950){ mMaxNum = values; mTotalAngle = (values - 700) * 40 / 250f + 170; sesameLevel = "信用極好"; evaluationTime = "評估時間:" + getCurrentTime(); } else{ mTotalAngle = 240f; } startAnim();}總結
這篇文章只分析了新版的實現過程，舊版的的實現思路也差不多，代碼也不復雜。希望這篇文章對大家開發Android能有所幫助，如果有疑問可以留言交流。
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