Android实现环形进度条代码

 public class AttendanceProgressBar extends View {
 // 画圆环底部的画笔
 private Paint mCirclePaint;
 // 画圆环的画笔
 private Paint mRingPaint;
 // 画字体的画笔
 private Paint mTextPaint;
 // 圆形颜色
 private int mCircleColor;
 // 圆环颜色
 private int mRingColor;
 // 半径
 private float mRadius;
 // 圆环半径
 private float mRingRadius;
 // 圆环宽度
 private float mStrokeWidth;
 // 圆心x坐标
 private int mXCenter;
 // 圆心y坐标
 private int mYCenter;
 // 字的长度
 private float mTxtWidth;
 // 字的高度
 private float mTxtHeight;
 // 总进度
 private int mTotalProgress = 100;
 // 当前进度
 private int mProgress = 80;
 //字体颜色
 private int mTextColor;
 // 字体大小
 private float mTextSize;

 public AttendanceProgressBar(Context context, AttributeSet attrs) {
 super(context, attrs);
 // 获取自定义的属性
 initAttrs(context, attrs);
 initVariable();
 }

 private void initAttrs(Context context, AttributeSet attrs) {
 TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs,
  R.styleable.AttendanceProgressBar, 0, 0);
 mRadius = typeArray.getDimension(R.styleable.AttendanceProgressBar_radius, 80);
 mStrokeWidth = typeArray.getDimension(R.styleable.AttendanceProgressBar_strokeWidth, 10);
 mCircleColor = typeArray.getColor(R.styleable.AttendanceProgressBar_circleColor, 0xFFFFFFFF);
 mRingColor = typeArray.getColor(R.styleable.AttendanceProgressBar_ringColor, 0xFFFFFFFF);
 mTextColor = typeArray.getColor(R.styleable.AttendanceProgressBar_textColor, 0xFF000000);
 mTextSize = typeArray.getDimension(R.styleable.AttendanceProgressBar_textSize, 80);

 mRingRadius = mRadius + mStrokeWidth / 2;
 }

 private void initVariable() {
 mCirclePaint = new Paint();
 mCirclePaint.setAntiAlias(true);
 mCirclePaint.setColor(mCircleColor);
// mCirclePaint.setStyle(Paint.Style.FILL);
 mCirclePaint.setStyle(Paint.Style.STROKE);
 mCirclePaint.setStrokeWidth(mStrokeWidth);

 mRingPaint = new Paint();
 mRingPaint.setAntiAlias(true);
 mRingPaint.setColor(mRingColor);
 mRingPaint.setStyle(Paint.Style.STROKE);
 mRingPaint.setStrokeWidth(mStrokeWidth);

 mTextPaint = new Paint();
 mTextPaint.setAntiAlias(true);
 mTextPaint.setStyle(Paint.Style.FILL);
 mTextPaint.setColor(mTextColor);
// mTextPaint.setARGB(255, 255, 255, 255);
// mTextPaint.setTextSize(mRadius / 2);
 mTextPaint.setTextSize(mTextSize);
 Paint.FontMetrics fm = mTextPaint.getFontMetrics();
 mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);

 }

 @Override
 protected void onDraw(Canvas canvas) {

 mXCenter = getWidth() / 2;
 mYCenter = getHeight() / 2;

// canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);

 canvas.drawCircle(mXCenter, mYCenter, mRingRadius, mCirclePaint);
 RectF oval = new RectF();
 oval.left = (mXCenter - mRingRadius);
 oval.top = (mYCenter - mRingRadius);
 oval.right = mRingRadius * 2 + (mXCenter - mRingRadius);
 oval.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);
 canvas.drawArc(oval, -90, ((float) mProgress / mTotalProgress) * 360, false, mRingPaint); //
//   canvas.drawCircle(mXCenter, mYCenter, mRadius + mStrokeWidth / 2, mRingPaint);
//  String txt = mProgress + "%";
 String txt = "16/18";
 mTxtWidth = mTextPaint.measureText(txt, 0, txt.length());
//  canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint);
 canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4 - dipToPx(10), mTextPaint);
 txt = "出勤人数";
 mTxtWidth = mTextPaint.measureText(txt, 0, txt.length());
 canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4 + dipToPx(10), mTextPaint);
 }

 public void setProgress(int progress) {
 mProgress = progress;
 postInvalidate();
 }
 private int dipToPx(int dip) {
 float scale = getContext().getResources().getDisplayMetrics().density;
 return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1));
 }


}

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="AttendanceProgressBar">
 <attr name="radius" format="dimension"/>
 <attr name="strokeWidth" format="dimension"/>
 <attr name="circleColor" format="color"/>
 <attr name="ringColor" format="color"/>
 <attr name="textColor" format="color"/>
 <attr name="textSize" format="dimension"/>
 </declare-styleable>
</resources>

 <com.ztd.lieyi.widget.AttendanceProgressBar
  android:layout_gravity="center"
  android:layout_width="100dp"
  android:layout_height="100dp"
  app:radius="45dp"
  app:strokeWidth="5dp"
  app:textSize="@dimen/text_16"
  app:textColor="@color/color_333333"
  app:circleColor="@color/color_d5ebfd"
  app:ringColor="@color/color_2c9df7"/>