http://www.jianshu.com/p/4e0eb9bb09ab
packagecom.example.mrwang.paintcircu;
importandroid.content.Context;
importandroid.content.res.TypedArray;
importandroid.graphics.Canvas;
importandroid.graphics.Color;
importandroid.graphics.Paint;
importandroid.graphics.RectF;
importandroid.graphics.Typeface;
importandroid.util.AttributeSet;
importandroid.view.View;
/**
* Created by MrWang on 2017/5/15.
*/
public classRoundProgressBarextendsView {
intmMaxStep;//最大数值
intprogress;//当前进度值
intmRoundProgressColor;//半弧进度值
intmTextColor;//字体色值
intmRoundColor;//半弧底色
intmRadius;//半径
intcenterX;//x轴
intcenterY;//y轴
intmPercent;//百分比
floatmRoundWidth;//弧形宽度
PaintmPaint;
publicRoundProgressBar(Context context) {
this(context, null);
}
publicRoundProgressBar(Context context,AttributeSet attrs) {
this(context,attrs,0);
}
publicRoundProgressBar(Context context,AttributeSet attrs, intdefStyleAttr) {
super(context,attrs,defStyleAttr);
mPaint=newPaint();
TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
R.styleable.RoundProgressBar);
//获取自定义属性和默认值
mRoundColor= mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor,Color.WHITE);
mRoundProgressColor= mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor,Color.parseColor("#fd9426"));
mTextColor= mTypedArray.getColor(R.styleable.RoundProgressBar_textColors,Color.GREEN);
mRoundWidth= mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth,5);
mMaxStep= mTypedArray.getInteger(R.styleable.RoundProgressBar_max,100);
mTypedArray.recycle();
}
@Override
protected voidonDraw(Canvas canvas) {
super.onDraw(canvas);
/**画背景圆弧*/
//int centerX = mViewWidth / 2;
//int centerY = mViewHeight / 2;
centerX= getWidth() /2;
centerY= getHeight() /2;
//设置圆弧画笔的宽度
mPaint.setStrokeWidth(mRoundWidth);
//设置为ROUND
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeJoin(Paint.Join.ROUND);
//设置画笔颜色
mPaint.setColor(mRoundColor);
mPaint.setStyle(Paint.Style.STROKE);
//半径
mRadius= (int) (centerX-mRoundWidth);
RectF oval =newRectF(centerX-mRadius,centerY-mRadius,centerX+mRadius,centerY+mRadius);
//画背景圆弧
canvas.drawArc(oval,-180,180, true,mPaint);
/**画进度圆弧*/
mPaint.setColor(mRoundProgressColor);
//计算当前百分比
//float percent = (float) progress / mMaxStep;
//根据当前百分比计算圆弧扫描的角度
canvas.drawArc(oval,-180,180*progress/mMaxStep, true,mPaint);
/**画数字进度值* */
mPaint.setStrokeWidth(0);
mPaint.setColor(mTextColor);
mPaint.setTextSize(20);
mPaint.setTypeface(Typeface.DEFAULT_BOLD);//设置字体
//中间的进度百分比，先转换成float在进行除法运算，不然都为0
mPercent= (int) (((float)progress/ (float)mMaxStep) *100);
//画进度值显示位置 这里也可将"progress"直接当进度值
canvas.drawText(mPercent+"",getWidth() /2,getHeight() /2,mPaint);
}
//设置当前最大步数
public synchronized void setMaxStep(intmaxStep) {
if(maxStep <0) {
throw newIllegalArgumentException("maxStep不能小于0!");
}
this.mMaxStep= maxStep;
}
//设置进度
public synchronized void setProgress(intprogress) {
if(progress <0) {
throw newIllegalArgumentException("progress不能小于0!");
}
if(progress >mMaxStep) {
progress =mMaxStep;
}
if(progress <=mMaxStep) {
this.progress= progress;
//重新刷新绘制-> onDraw()
postInvalidate();
}
}
public synchronized intgetProgress() {
return progress;
}
public synchronized intgetMaxStep() {
return mMaxStep;
}
}
