转载时请注明出处，尊重他人的劳动成果，谢谢。
先附上效果图：
这个控件是动态加载到75%的，主要我忘了怎么做动态图，就先放一个静态图在这里表示表示。旁边这个没有没有喜欢的？有想知道的 我可以告诉答案。
现附上代码,不懂的请留言：
package com.sahadev.circleview;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Scroller;public class CircleView extends View implements OnClickListener {private Paint outPaint, inPaint;/* The Circle's radius */private int radius = 200;/* The torus's width */private int width = 50, backgroundColor = Color.WHITE;// 默认 背景色为纯白private RectF mTempRectF = new RectF();private int mProgress;// 当前进度private int mTargetProgress = 75;// 目标进度private int mWidth = 400, mHeight = 400;// 该控件的初始大小为400*400private Scroller mScroller;// 滑动辅助类private int duration = 1000;// 动画间隔时间private int textSize = 50, mFontHeight;private float mTextWidth = 0;public CircleView(Context context) {this(context, null);}public CircleView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public CircleView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);outPaint = new Paint();inPaint = new Paint();outPaint.setTextSize(textSize);mScroller = new Scroller(context);mScroller.forceFinished(false);outPaint.setColor(Color.argb(90, 90, 90, 90));outPaint.setStyle(Paint.Style.FILL_AND_STROKE);outPaint.setAntiAlias(true);inPaint.setColor(backgroundColor);inPaint.setAntiAlias(true);setBackgroundColor(backgroundColor);FontMetrics fm = outPaint.getFontMetrics();// 得到系统默认字体属性mFontHeight = (int) (Math.ceil(fm.descent - fm.top) + 2);// 获得字体高度mFontHeight = mFontHeight - textSize;mTempRectF.set(0, 0, mWidth, mHeight);}public void setTextSize(int textSize) {this.textSize = textSize;}/** 设置背景色* * @see android.view.View#setBackgroundColor(int)*/public void setBackgroundColor(int color) {this.backgroundColor = color;}/*** 设置圆圈颜色* * @param color*/public void setCircleColor(int color) {outPaint.setColor(color);}/*** 设置圆圈半径* * @param radius*/public void setRadius(int radius) {this.radius = radius;}/*** 设置圆圈宽度* * @param width*/public void setWidth(int width) {this.width = width;}/*** 设置目标进度* * @param progress* 大于0，小于100*/public void setTargetProgress(int progress) {this.mTargetProgress = progress;}/*** 可以作为进度条设置当前进度* * @param progress*/public void setProgress(int progress) {this.mProgress = progress;postInvalidate();}@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:onClick(this);return true;}return super.onTouchEvent(event);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);canvas.drawArc(mTempRectF, -90, 360 * mProgress / 100, true, outPaint);// 画一个扇形canvas.drawCircle(mWidth / 2, mHeight / 2, radius - width, inPaint);// 中心画一个圆mTextWidth = outPaint.measureText(mProgress + "%");canvas.drawText(mProgress + "%", (mWidth - mTextWidth) / 2, (mHeight) / 2 + mFontHeight, outPaint);}/** 获取适合的高宽* * @see android.view.View#onMeasure(int, int)*/@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int size = 0;size = widthMeasureSpec > mWidth && heightMeasureSpec > mHeight ? (mWidth > mHeight ? mHeight : mWidth) : (widthMeasureSpec > heightMeasureSpec ? heightMeasureSpec: widthMeasureSpec);/* 该控件为正方形 */setMeasuredDimension(size, size);}/** 触动该控件 绘制到指定位置* * @see android.view.View.OnClickListener#onClick(android.view.View)*/@Overridepublic void onClick(View v) {mScroller.startScroll(0, 0, mTargetProgress, 0, duration);postInvalidate();}/*** 设置动画绘制时间* * @param duration*/public void setDuration(int duration) {this.duration = duration;}@Overridepublic void computeScroll() {super.computeScroll();if (mScroller.computeScrollOffset()) {mProgress = mScroller.getCurrX();postInvalidate();}}}
像一般自定义控件使用这个控件就可以了，具体方法相信大家都懂得，我就不贴方法了，只用设置进去就可以看到效果。
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