android实现环形进度条|Android实现环形进度条的实例

【www.bbyears.com--Tenda路由器】

Android实现环形进度条的效果图如下：

自定义控件：AttendanceProgressBar

代码如下：

publicclassAttendanceProgressBarextendsView {

  // 画圆环底部的画笔

  privatePaint mCirclePaint;

  // 画圆环的画笔

  privatePaint mRingPaint;

  // 画字体的画笔

  privatePaint mTextPaint;

  // 圆形颜色

  privateintmCircleColor;

  // 圆环颜色

  privateintmRingColor;

  // 半径

  privatefloatmRadius;

  // 圆环半径

  privatefloatmRingRadius;

  // 圆环宽度

  privatefloatmStrokeWidth;

  // 圆心x坐标

  privateintmXCenter;

  // 圆心y坐标

  privateintmYCenter;

  // 字的长度

  privatefloatmTxtWidth;

  // 字的高度

  privatefloatmTxtHeight;

  // 总进度

  privateintmTotalProgress =100;

  // 当前进度

  privateintmProgress =80;

  //字体颜色

  privateintmTextColor;

  // 字体大小

  privatefloatmTextSize;

  publicAttendanceProgressBar(Context context, AttributeSet attrs) {

    super(context, attrs);

    // 获取自定义的属性

    initAttrs(context, attrs);

    initVariable();

  }

  privatevoidinitAttrs(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;

  }

  privatevoidinitVariable() {

    mCirclePaint =newPaint();

    mCirclePaint.setAntiAlias(true);

    mCirclePaint.setColor(mCircleColor);

//    mCirclePaint.setStyle(Paint.Style.FILL);

    mCirclePaint.setStyle(Paint.Style.STROKE);

    mCirclePaint.setStrokeWidth(mStrokeWidth);

    mRingPaint =newPaint();

    mRingPaint.setAntiAlias(true);

    mRingPaint.setColor(mRingColor);

    mRingPaint.setStyle(Paint.Style.STROKE);

    mRingPaint.setStrokeWidth(mStrokeWidth);

    mTextPaint =newPaint();

    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

  protectedvoidonDraw(Canvas canvas) {

    mXCenter = getWidth() /2;

    mYCenter = getHeight() /2;

//    canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);

    canvas.drawCircle(mXCenter, mYCenter, mRingRadius, mCirclePaint);

    RectF oval =newRectF();

    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);

  }

  publicvoidsetProgress(intprogress) {

    mProgress = progress;

    postInvalidate();

  }

  privateintdipToPx(intdip) {

    floatscale = 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：

最后，在xml文件中，可以这样使用

        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"/>

本文来源：http://www.bbyears.com/luyouqishezhi/119721.html