Android自定义圆环式进度条

安卓自定义圆环式进度条，供大家参考，具体内容如下

需求是实现一个圆环式中间带有进度的进度条，自己动手实现一个

package com.djt.aienglish.widget;

import android.content.context;
import android.content.res.typedarray;
import android.graphics.canvas;
import android.graphics.paint;
import android.graphics.rectf;
import android.text.textutils;
import android.util.attributeset;
import android.view.view;

import com.djt.aienglish.r;


/**
 * @author qiu
 * @date 2020/3/12 13:51
 */
public class circlepgbar extends view {
    private int mheight = 0;
    private int mwidth = 0;

    // 画圆环的画笔
    private paint mringpaint;
    // 画圆环的画笔背景色
    private paint mringpaintbg;
    // 画字体的画笔
    private paint mtextpaint;
    // 圆环颜色
    private int mringcolor;
    // 圆环背景颜色
    private int mringbgcolor;
    // 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 max = 100;
    // 当前进度
    private int progress;
    private string text;

    public circlepgbar(context context, attributeset attrs) {
        super(context, attrs);
        // 获取自定义的属性
        initattrs(context, attrs);
        initvariable();
    }

    /**
     * 属性
     */
    private void initattrs(context context, attributeset attrs) {
        typedarray typearray = context.gettheme().obtainstyledattributes(attrs,
                r.styleable.taskscompletedview, 0, 0);
        mstrokewidth = typearray.getdimension(r.styleable.taskscompletedview_circlewidth, 0);
        mringcolor = typearray.getcolor(r.styleable.taskscompletedview_ringcolor, 0xffffffff);
        mringbgcolor = typearray.getcolor(r.styleable.taskscompletedview_ringbgcolor, 0xffffffff);
        text = typearray.getstring(r.styleable.taskscompletedview_text);
        max = typearray.getinteger(r.styleable.taskscompletedview_max, 0);
        progress = typearray.getinteger(r.styleable.taskscompletedview_progress, 0);
    }

    /**
     * 初始化画笔
     */
    private void initvariable() {
        //外圆弧背景
        mringpaintbg = new paint();
        mringpaintbg.setantialias(true);
        mringpaintbg.setcolor(mringbgcolor);
        mringpaintbg.setstyle(paint.style.stroke);
        mringpaintbg.setstrokewidth(mstrokewidth);
        //外圆弧
        mringpaint = new paint();
        mringpaint.setantialias(true);
        mringpaint.setcolor(mringcolor);
        mringpaint.setstyle(paint.style.stroke);
        mringpaint.setstrokewidth(mstrokewidth);
        //mringpaint.setstrokecap(paint.cap.round);//设置线冒样式，有圆 有方
        //中间字
        mtextpaint = new paint();
        mtextpaint.setantialias(true);
        mtextpaint.setstyle(paint.style.fill);
        mtextpaint.setcolor(mringcolor);
        invalidate();
    }

    //测量
    @override
    protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
        super.onmeasure(widthmeasurespec, heightmeasurespec);
        //实际测量宽高
        mheight = getmeasuredheight();
        mwidth = getmeasuredwidth();
        if (mwidth > mheight) {
            mradius = mheight / 2;
        } else {
            mradius = mwidth / 2;
        }
        //半径
        mringradius = mradius - mstrokewidth / 2;
        //文字宽高测量
        mtextpaint.settextsize(mradius / 2);
        paint.fontmetrics fm = mtextpaint.getfontmetrics();
        mtxtheight = (int) math.ceil(fm.descent - fm.ascent);
    }

    /**
     * 画图
     */
    @override
    protected void ondraw(canvas canvas) {
        mxcenter = mwidth / 2;
        mycenter = mheight / 2;
        //外圆弧背景
        rectf rectbg = new rectf(mxcenter - mringradius, mycenter - mringradius, mxcenter + mringradius, mycenter + mringradius);
        canvas.drawarc(rectbg, 0, 360, false, mringpaintbg);
        //外圆弧//进度
        if (progress > 0) {
            rectf oval = new rectf(mxcenter - mringradius, mycenter - mringradius, mxcenter + mringradius, mycenter + mringradius);
            canvas.drawarc(oval, -90, ((float) progress / max) * 360, false, mringpaint);
        }
        //字体
        if(!textutils.isempty(text)) {
            mtxtwidth = mtextpaint.measuretext(text, 0, text.length());
            canvas.drawtext(text, mxcenter - mtxtwidth / 2, mycenter + mtxtheight / 4, mtextpaint);
        }
    }

    /**
     * 设置进度
     *
     * @param progress
     */
    public void setprogress(int progress) {
        this.progress = progress;
        postinvalidate();//重绘
    }

    /**
     * 设置最大值
     *
     * @param max
     */
    public void setmax(int max) {
        this.max = max;
        postinvalidate();
    }

    /**
     * 设置文字内容
     *
     * @param text
     */
    public void settext(string text) {
        this.text = text;
        postinvalidate();
    }
}

别忘记在value下的attr.xml中加入默认配置属性

<!--圆弧进度条-->
    <declare-styleable name="taskscompletedview">
        <attr name="circlewidth" format="dimension" />
        <attr name="ringcolor" format="color" />
        <attr name="ringbgcolor" format="color" />
        <attr name="text" format="string" />
        <attr name="progress" format="integer" />
     <attr name="max" format="integer" />
</declare-styleable>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。