项目中需要实现一个计步进度的环形Progress，当未达到设定目标时，绘制特定弧度（(已实现步数/目标步数)*360°）的圆弧。当已实现步数大于等于目标步数时绘制整个360°圆环。
效果图：
代码实现：
设置已完成步数和目标步数：
public void setStep(int stepDone, int stepGoal) {
this.stepDone = stepDone;
this.stepGoal = stepGoal;
int progess = (stepDone * 100) / stepGoal;
if (progess > 100) {
setProgress(100);
} else {
setProgress(progess);
}
}
设置进度：
public void setProgress(int progress) {
this.mProgress = progress;
this.invalidate();
}
设置画笔属性：
mPaint.setAntiAlias(true); mPaint.setColor(Color.rgb(0xe9, 0xe9, 0xe9)); canvas.drawColor(Color.TRANSPARENT); mPaint.setStrokeWidth(LINE_WIDTH_BG); mPaint.setStyle(Paint.Style.STROKE);
绘制环形和背景：
canvas.drawArc(mRectF, -90, 360, false, mPaint); mPaint.setColor(Color.rgb(0xf8, 0x60, 0x30)); canvas.drawArc(mRectF, -90, ((float) mProgress / mMaxProgress) * 360, false, mPaint);
绘制步数和单位：
mPaint.setStrokeWidth(TEXT_WIDTH);
String text = stepDone + context.getString(R.string.step_unit);
int textHeight = height / 4;
mPaint.setTextSize(textHeight);
int textWidth = (int) mPaint.measureText(text, 0, text.length());
mPaint.setStyle(Paint.Style.FILL);
canvas.drawText(text, width / 2 - textWidth / 2, height / 2 + textHeight / 4, mPaint);
绘制目标步数：
String textGoal = "/" + stepGoal;
int textGoalHeight = height / 8;
mPaint.setTextSize(textGoalHeight);
int textGoalWidth = (int) mPaint.measureText(textGoal, 0, textGoal.length());
mPaint.setStyle(Paint.Style.FILL);
canvas.drawText(textGoal, width / 2 - textGoalWidth / 2, height / 2 + textHeight / 2
+ textGoalHeight, mPaint);
