public class CircularProgressView extends View {

  private Paint mBackPaint, mProgPaint;  // 繪制畫筆
  private RectF mRectF;    // 繪制區(qū)域
  private int[] mColorArray; // 圓環(huán)漸變色
  private int mProgress;   // 圓環(huán)進(jìn)度(0-100)
  /**
   * 繪制弧線的畫筆
   */
  private Paint progressPaint;

  /**
   * 圓弧圓心位置
   */
  private int centerX, centerY;

  /**
   * 圓弧的半徑
   */
  private int circleRadius;

  public CircularProgressView(Context context) {
    this(context, null);
  }

  public CircularProgressView(Context context, @Nullable AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public CircularProgressView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    @SuppressLint("Recycle")
    TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CircularProgressView);

    // 初始化背景圓環(huán)畫筆
    mBackPaint = new Paint();
    mBackPaint.setStyle(Paint.Style.STROKE);  // 只描邊，不填充
    mBackPaint.setStrokeCap(Paint.Cap.ROUND);  // 設(shè)置圓角
    mBackPaint.setAntiAlias(true);       // 設(shè)置抗鋸齒
    mBackPaint.setDither(true);         // 設(shè)置抖動
    mBackPaint.setStrokeWidth(typedArray.getDimension(R.styleable.CircularProgressView_backWidth, 5));
    mBackPaint.setColor(typedArray.getColor(R.styleable.CircularProgressView_progbgColor, Color.LTGRAY));

    // 初始化進(jìn)度圓環(huán)畫筆
    mProgPaint = new Paint();
    mProgPaint.setStyle(Paint.Style.STROKE);  // 只描邊，不填充
    mProgPaint.setStrokeCap(Paint.Cap.ROUND);  // 設(shè)置圓角
    mProgPaint.setAntiAlias(true);       // 設(shè)置抗鋸齒
    mProgPaint.setDither(true);         // 設(shè)置抖動
    mProgPaint.setStrokeWidth(typedArray.getDimension(R.styleable.CircularProgressView_progWidth, 10));
    mProgPaint.setColor(typedArray.getColor(R.styleable.CircularProgressView_progColor, Color.BLUE));


    //初始化結(jié)束位置小圓點
    progressPaint = new Paint();
    progressPaint.setStyle(Paint.Style.FILL);  // 填充
    progressPaint.setStrokeCap(Paint.Cap.ROUND);  // 設(shè)置圓角
    progressPaint.setAntiAlias(true);       // 設(shè)置抗鋸齒
    progressPaint.setDither(true);         // 設(shè)置抖動
    progressPaint.setStrokeWidth(typedArray.getDimension(R.styleable.CircularProgressView_progWidth, 10));
    progressPaint.setColor(Color.WHITE);

    // 初始化進(jìn)度圓環(huán)漸變色
    int startColor = typedArray.getColor(R.styleable.CircularProgressView_progStartColor, -1);
    int firstColor = typedArray.getColor(R.styleable.CircularProgressView_progFirstColor, -1);
    if (startColor != -1 && firstColor != -1) mColorArray = new int[]{startColor, firstColor};
    else mColorArray = null;

    // 初始化進(jìn)度
    mProgress = typedArray.getInteger(R.styleable.CircularProgressView_progress, 0);
    typedArray.recycle();
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int viewWide = getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
    int viewHigh = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
    int mRectLength = (int) ((viewWide > viewHigh ? viewHigh : viewWide) - (mBackPaint.getStrokeWidth() > mProgPaint.getStrokeWidth() ? mBackPaint.getStrokeWidth() : mProgPaint.getStrokeWidth()));
    int mRectL = getPaddingLeft() + (viewWide - mRectLength) / 2;
    int mRectT = getPaddingTop() + (viewHigh - mRectLength) / 2;
    mRectF = new RectF(mRectL, mRectT, mRectL + mRectLength, mRectT + mRectLength);

    centerX = getMeasuredWidth() / 2;
    centerY = getMeasuredHeight() / 2;

    //計算圓弧半徑和圓心點
    circleRadius = Math.min(getMeasuredWidth(), getMeasuredHeight()) / 2;
    circleRadius-=8;
    // 設(shè)置進(jìn)度圓環(huán)漸變色
    if (mColorArray != null && mColorArray.length > 1)
      mProgPaint.setShader(new LinearGradient(0, 0, 0, getMeasuredWidth(), mColorArray, null, Shader.TileMode.MIRROR));
  }

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.drawArc(mRectF, 0, 360, false, mBackPaint);
    canvas.drawArc(mRectF, 270, 360 * mProgress / 100, false, mProgPaint);

    //繪制結(jié)束位置小圓形
    progressPaint.setStrokeWidth(10);
    progressPaint.setStyle(Paint.Style.FILL);
    float swipe = 360 * mProgress / 100;
    Log.d("=================", swipe + "    mProgress");
    float radians = (float) (((swipe - 90) / 2) / 180 * 2 * Math.PI);
    float endX;
    float endY;

    endX = centerX + circleRadius * (float) Math.cos(radians);
    endY = centerY + circleRadius * (float) Math.sin(radians);

    if (mProgress!=0) {
      canvas.drawCircle(endX, endY, 8, progressPaint);
    }


  }

  /**
   * 獲取當(dāng)前進(jìn)度
   *
   * @return 當(dāng)前進(jìn)度（0-100）
   */
  public int getProgress() {
    return mProgress;
  }

  /**
   * 設(shè)置當(dāng)前進(jìn)度
   *
   * @param progress 當(dāng)前進(jìn)度（0-100）
   */
  public void setProgress(int progress) {
    this.mProgress = progress;
    invalidate();
  }

  /**
   * 設(shè)置當(dāng)前進(jìn)度，并展示進(jìn)度動畫。如果動畫時間小于等于0，則不展示動畫
   *
   * @param progress 當(dāng)前進(jìn)度（0-100）
   * @param animTime 動畫時間（毫秒）
   */
  public void setProgress(int progress, long animTime) {
    if (animTime <= 0) setProgress(progress);
    else {
      ValueAnimator animator = ValueAnimator.ofInt(mProgress, progress);
      animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
          mProgress = (int) animation.getAnimatedValue();
          invalidate();
        }
      });
      animator.setInterpolator(new OvershootInterpolator());
      animator.setDuration(animTime);
      animator.start();
    }
  }

  /**
   * 設(shè)置背景圓環(huán)寬度
   *
   * @param width 背景圓環(huán)寬度
   */
  public void setBackWidth(int width) {
    mBackPaint.setStrokeWidth(width);
    invalidate();
  }

  /**
   * 設(shè)置背景圓環(huán)顏色
   *
   * @param color 背景圓環(huán)顏色
   */
  public void setBackColor(/*@ColorRes int color*/String color) {
    mBackPaint.setColor(Color.parseColor(color)); //畫筆顏色
    invalidate();
  }

  /**
   * 設(shè)置進(jìn)度圓環(huán)寬度
   *
   * @param width 進(jìn)度圓環(huán)寬度
   */
  public void setProgWidth(int width) {
    mProgPaint.setStrokeWidth(width);
    invalidate();
  }

  /**
   * 設(shè)置進(jìn)度圓環(huán)顏色
   *
   * @param color 景圓環(huán)顏色
   */
  public void setProgColor(/*@ColorRes int color*/String color) {
    mProgPaint.setColor(Color.parseColor(color)); //畫筆顏色
    mProgPaint.setShader(null);
    invalidate();
  }

  /**
   * 設(shè)置進(jìn)度圓環(huán)顏色(支持漸變色)
   *
   * @param startColor 進(jìn)度圓環(huán)開始顏色
   * @param firstColor 進(jìn)度圓環(huán)結(jié)束顏色
   */
  public void setProgColor(@ColorRes int startColor, @ColorRes int firstColor) {
    mColorArray = new int[]{ContextCompat.getColor(getContext(), startColor), ContextCompat.getColor(getContext(), firstColor)};
    mProgPaint.setShader(new LinearGradient(0, 0, 0, getMeasuredWidth(), mColorArray, null, Shader.TileMode.MIRROR));
    invalidate();
  }

  /**
   * 設(shè)置進(jìn)度圓環(huán)顏色(支持漸變色)
   *
   * @param colorArray 漸變色集合
   */
  public void setProgColor(@ColorRes int[] colorArray) {
    if (colorArray == null || colorArray.length < 2) return;
    mColorArray = new int[colorArray.length];
    for (int index = 0; index < colorArray.length; index++)
      mColorArray[index] = ContextCompat.getColor(getContext(), colorArray[index]);
    mProgPaint.setShader(new LinearGradient(0, 0, 0, getMeasuredWidth(), mColorArray, null, Shader.TileMode.MIRROR));
    invalidate();
  }
}

<declare-styleable name="CircularProgressView">
    <attr name="backWidth" format="dimension" />  <!--背景圓環(huán)寬度-->
    <attr name="progWidth" format="dimension" />  <!--進(jìn)度圓環(huán)寬度-->
    <attr name="progbgColor" format="color" />    <!--背景圓環(huán)顏色-->
    <attr name="progColor" format="color" />    <!--進(jìn)度圓環(huán)顏色-->
    <attr name="progStartColor" format="color" />  <!--進(jìn)度圓環(huán)開始顏色-->
    <attr name="progFirstColor" format="color" />  <!--進(jìn)度圓環(huán)結(jié)束顏色-->
    <attr name="progress" format="integer" />    <!--圓環(huán)進(jìn)度-->
 </declare-styleable>

<com.view.CircularProgressView
  android:layout_width="170dp"
  android:layout_height="170dp"
  android:layout_centerInParent="true"
  android:layout_centerHorizontal="true"
  app:backWidth="5dp"
  app:progWidth="5dp"
  app:progbgColor="#4C5098"
  app:progress="50"
  android:layout_marginTop="500dp"
  />