Android实现环形进度条的实例

Android实现环形进度条的效果图如下：

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~如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！

来源：http://www.cnblogs.com/shenchanghui/archive/2017/01/13/6282206.html