Android动态自定义圆形进度条

效果图：

a.绘制圆环，圆弧，文本

//1.画圆环
//原点坐标
float circlex = width / 2;
float circley = width / 2;
//半径
float radius = width / 2 - roundwidth / 2;
//设置画笔的属性
paint.setcolor(roundcolor);
paint.setstrokewidth(roundwidth);
paint.setstyle(paint.style.stroke);
canvas.drawcircle(circlex, circley, radius, paint);
//2.画圆弧
rectf oval = new rectf(roundwidth/2,roundwidth/2,width-roundwidth/2,width - roundwidth/2);
paint.setcolor(roundprogresscolor);
canvas.drawarc(oval, 0, progress * 360 / max, false, paint);
//3.画文本
paint.settextsize(textsize);
paint.setcolor(textcolor);
paint.setstrokewidth(0);
string text = progress * 100 / max + "%";
rect bounds = new rect();
paint.gettextbounds(text, 0, text.length(), bounds);
canvas.drawtext(text, width / 2 - bounds.width() / 2, width / 2 + bounds.height() / 2, paint);

b.自定义属性的具体步骤

具体步骤：

1. 定义属性: 在values目录下创建attrs.xml

<declare-styleable name="roundprogress">
 <attr name="roundcolor" format="color"></attr>
 <attr name="roundprogresscolor" format="color"></attr>
 <attr name="textcolor" format="color"></attr>
 <attr name="roundwidth" format="dimension"></attr>
 <attr name="textsize" format="dimension"></attr>
</declare-styleable>

2. 在布局文件中引用当前应用的名称空间

xmlns:atguigu=http://schemas.android.com/apk/res-auto

3. 在自定义视图标签中使用自定义属性

<com.atguigu.p2p.util.roundprogress
  android:id="@+id/rp_home_progress"
  android:layout_width="120dp"
  android:layout_height="120dp"
  android:layout_gravity="center_horizontal"
  android:layout_margintop="20dp"
  atguigu:roundcolor="@android:color/darker_gray         <br>  atguigu:roundprogresscolor="@android:color/holo_red_dark"
  atguigu:textcolor="@color/text_progress"
  atguigu:roundwidth="10dp"
  atguigu:textsize="20sp"
  /> 

4. 在自定义view类的构造方法中, 取出布局中的自定义属性值

//1.得到所有自定义属性的数组
typedarray typedarray = context.obtainstyledattributes(attrs, r.styleable.roundprogress);
//2.获取自定义属性的值, 如果没有指定取默认值
roundcolor = typedarray.getcolor(r.styleable.roundprogress_roundcolor, color.red);
roundprogresscolor = typedarray.getcolor(r.styleable.roundprogress_roundprogresscolor, color.green);
textcolor = typedarray.getcolor(r.styleable.roundprogress_textcolor, color.green);
roundwidth = typedarray.getdimension(r.styleable.roundprogress_roundwidth, uiutils.dp2px(10));
textsize = typedarray.getdimension(r.styleable.roundprogress_textsize, uiutils.dp2px(20));
//3.释放资源数据
typedarray.recycle();

c.让圆环进度"动起来"

1.自定义roundprogress类中提供进度属性的getter和setter方法

2.在homefragment的onsuccess()中：

 github:https://github.com/ganchuanpu/p2pinvest

以上所述是小编给大家介绍的android动态自定义圆形进度条，希望对大家有所帮助