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最近做了一个功能，里面涉及到了渐变圆形的需求。就是一个颜色可以渐变的圆环，最后实现的效果如下图：
左图是带渐变效果，右图是不带渐变效果。原理还是绘图，canvas可以绘制的对象有：弧线(arcs)、填充颜色(argb和color)、 bitmap、圆(circle和oval)、点(point)、线(line)、矩形(rect)、图片(picture)、圆角矩形 (roundrect)、文本(text)、顶点(vertices)、路径(path)。通过组合这些对象我们可以画出一些简单有趣的界面出来，但是光有这些功能还是不够的，如果我要画一个仪表盘(数字围绕显示在一个圆圈中)呢？ 幸好android还提供了一些对canvas位置转换的方法：rorate、scale、translate、skew(扭曲)等，而且它允许你通过获得它的转换矩阵对象(getmatrix方法，不知道什么是转换矩阵？) 直接操作它。这些操作就像是虽然你的笔还是原来的地方画，但是画纸旋转或者移动了，所以你画的东西的方位就产生变化。为了方便一些转换操作，canvas 还提供了保存和回滚属性的方法(save和restore)，比如你可以先保存目前画纸的位置(save)，然后旋转90度，向下移动100像素后画一些图形，画完后调用restore方法返回到刚才保存的位置。
话不多说，上代码
核心类：
自定义控件 circleprogressbar
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package com.jky.mobile_xmxt.view;
import android.content.context;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.graphics.rectf;
import android.graphics.sweepgradient;
import android.util.attributeset;
import android.view.view;
import android.view.animation.animation;
import android.view.animation.transformation;
import com.jky.mobile_xmxt.r;
import java.text.decimalformat;
/**
* 圆盘计步图表
*/
public class circleprogressbar extends view {
private rectf mwheelrect = new rectf();
private paint mdefaultwheelpaint;
private paint mfinishwheelpaint;
private paint mcenterwheelpaint;
private paint mtitlepaint, msteppaint, mtargetpaint;
private float mcirclestrokewidth;
private float msweepangleper;
private float mpercent;
private int mstepnum, mcurrstepnum;
private float pressextrastrokewidth;
private baranimation manim;
private int mmaxstepnum;// 默认最大步数
private float mtitley, mstepy, mtargety;
private decimalformat mdecimalformat = new decimalformat("#.0");// 格式为保留小数点后一位
public static string goal_step;
public static string percent;
public circleprogressbar(context context) {
super(context);
init(null, 0);
}
public circleprogressbar(context context, attributeset attrs) {
super(context, attrs);
init(attrs, 0);
}
public circleprogressbar(context context, attributeset attrs, int defstyle) {
super(context, attrs, defstyle);
init(attrs, defstyle);
}
private void init(attributeset attrs, int defstyle) {
mfinishwheelpaint = new paint();
mfinishwheelpaint.setcolor(color.rgb(100, 113, 205));
mfinishwheelpaint.setstyle(paint.style.stroke);// 空心
mfinishwheelpaint.setstrokecap(paint.cap.round);// 圆角画笔
mfinishwheelpaint.setantialias(true);// 去锯齿
mcenterwheelpaint = new paint();
mcenterwheelpaint.setcolor(color.rgb(243, 243, 243));
mcenterwheelpaint.setstyle(paint.style.stroke);
mcenterwheelpaint.setstrokecap(paint.cap.round);
mcenterwheelpaint.setantialias(true);
mdefaultwheelpaint = new paint();
mdefaultwheelpaint.setcolor(color.rgb(127, 127, 127));
mdefaultwheelpaint.setstyle(paint.style.stroke);
mdefaultwheelpaint.setstrokecap(paint.cap.round);
mdefaultwheelpaint.setantialias(true);
mtitlepaint = new paint();
mtitlepaint.setantialias(true);
mtitlepaint.setcolor(color.white);
msteppaint = new paint();
msteppaint.setantialias(true);
msteppaint.setcolor(color.white);
mtargetpaint = new paint();
mtargetpaint.setantialias(true);
mtargetpaint.setcolor(color.white);
manim = new baranimation();
}
@override
protected void ondraw(canvas canvas) {
canvas.drawarc(mwheelrect, 0, 359, false, mdefaultwheelpaint);
canvas.drawarc(mwheelrect, 0, 359, false, mcenterwheelpaint);
canvas.drawarc(mwheelrect, 90, msweepangleper, false, mfinishwheelpaint);
// canvas.drawtext("步数", mwheelrect.centerx() - (mtitlepaint.measuretext("步数") / 2), mtitley,
// mtitlepaint);
canvas.drawtext(mcurrstepnum + "",
mwheelrect.centerx() - (msteppaint.measuretext(string.valueof(mcurrstepnum)) / 2), mstepy,
msteppaint);
string description = "";
float percent = getpercent();
if(percent > 0.5){
description ="严重污染";
}else if(percent<0.5){
description ="中等污染";
}else{
description ="普通污染";
}
canvas.drawtext(description , mwheelrect.centerx() -
(mtargetpaint.measuretext(description) / 2), mtargety, mtargetpaint);
sweepgradient sweepgradient = new sweepgradient(mwheelrect.centerx(), mwheelrect.centery(),
new int[]{getresources().getcolor(r.color.color_environment_severe), getresources().getcolor(r.color.color_environment_serious),
getresources().getcolor(r.color.color_environment_excellent),
getresources().getcolor(r.color.color_environment_good), getresources().getcolor(r.color.color_environment_mild),
getresources().getcolor(r.color.color_environment_moderate)}, null);
mfinishwheelpaint.setshader(sweepgradient);
}
@override
protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
int height = getdefaultsize(getsuggestedminimumheight(), heightmeasurespec);
int width = getdefaultsize(getsuggestedminimumwidth(), widthmeasurespec);
int min = math.min(width, height);// 获取view最短边的长度
setmeasureddimension(min, min);// 强制改view为以最短边为长度的正方形
mcirclestrokewidth = gettextscale(15, min);// 圆弧的宽度
pressextrastrokewidth = gettextscale(10, min);// 圆弧离矩形的距离
mwheelrect.set(mcirclestrokewidth + pressextrastrokewidth, mcirclestrokewidth + pressextrastrokewidth,
min - mcirclestrokewidth - pressextrastrokewidth, min - mcirclestrokewidth - pressextrastrokewidth);// 设置矩形
mtitlepaint.settextsize(gettextscale(60, min));
msteppaint.settextsize(gettextscale(120, min));
mtargetpaint.settextsize(gettextscale(40, min));
mtitley = gettextscale(170, min);
mstepy = gettextscale(300, min);
mtargety = gettextscale(380, min);
mfinishwheelpaint.setstrokewidth(mcirclestrokewidth);
mcenterwheelpaint.setstrokewidth(mcirclestrokewidth);
mdefaultwheelpaint.setstrokewidth(mcirclestrokewidth - gettextscale(2, min));
mdefaultwheelpaint.setshadowlayer(gettextscale(10, min), 0, 0, color.rgb(127, 127, 127));// 设置阴影
}
/**
* 进度条动画
*
* @author administrator
*/
public class baranimation extends animation {
/**
* 每次系统调用这个方法时， 改变msweepangleper，mpercent，stepnumbernow的值，
* 然后调用postinvalidate()不停的绘制view。
*/
@override
protected void applytransformation(float interpolatedtime, transformation t) {
// if (interpolatedtime < 1.0f) {
// mpercent = float.parsefloat(mdecimalformat.format(interpolatedtime * mstepnum * 100f / mmaxstepnum));// 将浮点值四舍五入保留一位小数
// msweepangleper = interpolatedtime * mstepnum * 360 / mmaxstepnum;
// mcurrstepnum = (int) (interpolatedtime * mstepnum);
// } else {
mpercent = float.parsefloat(mdecimalformat.format(mstepnum * 100f / mmaxstepnum));// 将浮点值四舍五入保留一位小数
if (mpercent > 100.0f) {
mpercent = 100.0f;
}
percent = string.valueof(mpercent);
msweepangleper = mstepnum * 360 / mmaxstepnum;
mcurrstepnum = mstepnum;
// }
requestlayout();
}
}
public float getpercent() {
return mpercent;
}
/**
* 根据控件的大小改变绝对位置的比例
*
* @param n
* @param m
* @return
*/
public float gettextscale(float n, float m) {
return n / 500 * m;
}
/**
* 更新步数和设置一圈动画时间
*
* @param stepcount
* @param time
*/
public void update(int stepcount, int time) {
this.mstepnum = stepcount;
manim.setduration(time);
// setanimationtime(time);
this.startanimation(manim);
}
/**
* @param stepnum
*/
public void setmaxstepnum(int stepnum) {
mmaxstepnum = stepnum;
goal_step = string.valueof(mmaxstepnum);
}
public void setcolor(int color) {
mfinishwheelpaint.setcolor(color);
msteppaint.setcolor(color);
}
/**
* 设置动画时间
*
* @param time
*/
public void setanimationtime(int time) {
manim.setduration(time * mstepnum / mmaxstepnum);// 按照比例设置动画执行时间
}
}
xml引用
<com.jky.mobile_xmxt.view.circleprogressbar android:id="@+id/color_progress_view" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="6" />
activity调用方法
color_progress_view = (circleprogressbar)view.findviewbyid(r.id.color_progress_view); color_progress_view.setmaxstepnum(500); color_progress_view.update(470,1000);
由于和调用其他控件方法类似，姑且省去了很多其他业务逻辑代码，代码不是特别复杂，修改起来也很方便（修改颜色，总量及比例等），所以只粘贴核心相关的代码，希望可以帮助到大家。
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