Android实现环形进度条代码

本文参考借鉴：https://www.jb51.net/article/102983.htm

先上效果图：

自定义控件：AttendanceProgressBar

代码如下：

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));
}

}

因为是自定义控件，所以在attr.xml文件定义了一些控件属性，以便在xml文件中设置这些属性

代码如下：

<?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>

最后，在xml文件中，可以这样使用

<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"/>

这只是初步处理，使用时可以根据需求酌情处理。