环形进度条

本文参考借鉴http://blog.csdn.net/jdsjlzx/article/details/42497135

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~