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這篇文章主要講解了Android自定義圓弧進(jìn)度條加數(shù)字動(dòng)態(tài)變化的方法，內(nèi)容清晰明了，對(duì)此有興趣的小伙伴可以學(xué)習(xí)一下，相信大家閱讀完之后會(huì)有幫助。

效果如下:

思路:一個(gè)內(nèi)環(huán)圓弧和一個(gè)外環(huán)圓弧,因?yàn)橛幸粋€(gè)圓圈是在圓弧上做圓周運(yùn)動(dòng),所以在畫圓的時(shí)候必須要得到圓弧上的各個(gè)點(diǎn)的坐標(biāo),這里其實(shí)就用到了PathMeasure這個(gè)類,可以幫我們拿到這些點(diǎn),在畫圓弧的時(shí)候也理所應(yīng)當(dāng)?shù)囊褂胮ath,然后根據(jù)外界動(dòng)態(tài)的傳值進(jìn)行重繪就能達(dá)到動(dòng)態(tài)的效果

代碼如下:

public class ProgressPathRainbow extends View {
  private Paint outPaint;
  private Paint innerPaint;
  private Paint mTextPaint;
  private Paint mRmbTextPaint;
  private int mBorderWidth = 40;
  private int mCircleRadius = 40;
  private int mCurrentProgress = 0;
  private int mMaxProgress = 0;
  private int startAngle = 180;

  private int sweepAngels = 180;
  private Paint mCirclePaint;
  private String rmb = "¥";
  private String currentText = "0.0";

  public void setCurrentText(String currentText) {
    this.currentText = currentText;
  }

  //儲(chǔ)存位置點(diǎn)
  private float[] pos =new float[2];

  public ProgressPathRainbow(Context context) {
    super(context);
    initPaint();
  }

  public ProgressPathRainbow(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    initPaint();
  }

  public ProgressPathRainbow(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initPaint();
  }

  private void initPaint(){
    outPaint = new Paint();
    outPaint.setColor(0xFFECECEC);
    outPaint.setAntiAlias(true);
    outPaint.setStyle(Paint.Style.STROKE);
    outPaint.setStrokeCap(Paint.Cap.ROUND);
    outPaint.setStrokeWidth(mBorderWidth);

    //
    innerPaint = new Paint();
    innerPaint.setColor(0xffFBA123);
    innerPaint.setAntiAlias(true);
    innerPaint.setStyle(Paint.Style.STROKE);
    innerPaint.setStrokeCap(Paint.Cap.ROUND);
    innerPaint.setStrokeWidth(mBorderWidth);

    mCirclePaint = new Paint();
    mCirclePaint.setColor(Color.WHITE);
    mCirclePaint.setStyle(Paint.Style.FILL);

    mTextPaint = new Paint();
    mTextPaint.setAntiAlias(true);
    mTextPaint.setColor(0xffE5423D);
    mTextPaint.setFakeBoldText(true);
    mTextPaint.setTextSize(SizeUtils.sp2px(42));


    mRmbTextPaint = new Paint();
    mRmbTextPaint.setAntiAlias(true);
    mRmbTextPaint.setColor(0xffE5423D);
    mRmbTextPaint.setTextSize(SizeUtils.sp2px(18));

  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int width = MeasureSpec.getSize(widthMeasureSpec);
    int height = MeasureSpec.getSize(heightMeasureSpec);
    if (width >= height){
      setMeasuredDimension(height,height);
    }else {
      setMeasuredDimension(width,width);
    }


  }

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

    RectF rectF = new RectF(mBorderWidth,mBorderWidth,getWidth()-mBorderWidth,getHeight()-mBorderWidth);
    //畫內(nèi)環(huán)圓弧
    Path outerPath = new Path();
    outerPath.arcTo(rectF,startAngle,sweepAngels);
    canvas.drawPath(outerPath,outPaint);
    //畫外環(huán)圓弧
    Path innerPah = new Path();
    float percent = (float)mCurrentProgress/mMaxProgress;
    innerPah.arcTo(rectF,startAngle,percent*sweepAngels);
    canvas.drawPath(innerPah,innerPaint);


    //畫金額
    String tempText = new BigDecimal(currentText).multiply(new BigDecimal(percent)).setScale(1, RoundingMode.HALF_UP).toString();
    Rect textBounds = new Rect();
    mTextPaint.getTextBounds(tempText, 0, tempText.length(), textBounds);
    int dx = getWidth()/2 - textBounds.width()/2;
    // 基線 baseLine
    Paint.FontMetricsInt fontMetrics = mTextPaint.getFontMetricsInt();
    int dy = (fontMetrics.bottom - fontMetrics.top)/2 - fontMetrics.bottom;
    int baseLine = getHeight()/3 + dy;
    canvas.drawText(tempText,dx,baseLine,mTextPaint);

    //畫人民幣符號(hào)

    Rect textBoundRmbs = new Rect();
    mTextPaint.getTextBounds(rmb, 0, rmb.length(), textBoundRmbs);
    int dxRmb = dx-50;
    // 基線 baseLine
    Paint.FontMetricsInt fontMetricsRmb = mTextPaint.getFontMetricsInt();
    int dyRmb = (fontMetricsRmb.bottom - fontMetricsRmb.top)/2 - fontMetricsRmb.bottom;
    int baseLineRmb = getHeight()/3 + dyRmb;
    canvas.drawText(rmb,dxRmb,baseLineRmb,mRmbTextPaint);

    //獲取圓弧上點(diǎn)的位置(坐標(biāo),畫一個(gè)圓)
    PathMeasure pathMeasure = new PathMeasure(outerPath,false);
    boolean posTan = pathMeasure.getPosTan(pathMeasure.getLength() * percent, pos, null);
    canvas.drawCircle(pos[0],pos[1],mCircleRadius,mCirclePaint);

  }

  public synchronized void setmCurrentProgress(int mCurrentProgress) {
    this.mCurrentProgress = mCurrentProgress;
    invalidate();
  }

  public synchronized void setmMaxProgress(int mMaxProgress) {
    this.mMaxProgress = mMaxProgress;
  }
}

網(wǎng)頁(yè)標(biāo)題：Android自定義圓弧進(jìn)度條加數(shù)字動(dòng)態(tài)變化的方法-創(chuàng)新互聯(lián)
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