Android自定义View实现圆环交替效果

<?xml version="1.0" encoding="utf-8"?>
<resources>
 
 <attr name="firstcolor" format="color"/>
 <attr name="secondcolor" format="color"/>
 <attr name="circlewidth" format="dimension"/>
 <attr name="speed" format="integer"/>
 
 <declare-styleable name="customview">
  <attr name="firstcolor" />
  <attr name="secondcolor" />
  <attr name="circlewidth" />
  <attr name="speed" />
 </declare-styleable>
 
</resources>

public class myselfcircleview extends view {
 
 /*
  * 第一圈颜色
  */
 int firstcolor;
 /*
  * 第二圈颜色
  */
 int secondcolor;
 /*
  * 圆的宽度
  */
 int circlewidth;
 /*
  * 速率
  */
 int speed;
 /*
  * 画笔
  */
 paint mpaint;
 /*
  * 进度
  */
 int mprogress;
 /*
  * 是否切换标志
  */
 boolean isnext;
 
 public myselfcircleview(context context, attributeset attrs,
   int defstyleattr) {
  super(context, attrs, defstyleattr); 
  typedarray typedarray = context.gettheme().obtainstyledattributes(attrs, r.styleable.customview, defstyleattr, 0);
  int n = typedarray.getindexcount();
  for(int i=0; i<n; i++){
   int attr = typedarray.getindex(i);
   switch (attr) {
    case r.styleable.customview_firstcolor:
     firstcolor = typedarray.getcolor(attr, color.red);
     break;
    case r.styleable.customview_secondcolor:
     secondcolor = typedarray.getcolor(attr, color.red);
     break;
    case r.styleable.customview_circlewidth:
     circlewidth = typedarray.getdimensionpixelsize(attr, (int) typedvalue.applydimension( 
       typedvalue.complex_unit_px, 20, getresources().getdisplaymetrics())); 
     break;
    case r.styleable.customview_speed:
     speed = typedarray.getint(attr, 20);
     break;
   }
  }
  typedarray.recycle();
  
  mpaint = new paint();
  new thread(new runnable() {
   @override
   public void run() {
    while (true) {
     mprogress++;
     if (mprogress == 360) { 
      mprogress = 0; 
      if (!isnext) 
       isnext = true; 
      else 
       isnext = false; 
     } 
     postinvalidate(); 
     try { 
      thread.sleep(speed); 
     } catch (interruptedexception e) { 
      e.printstacktrace(); 
     } 
    }
   }
  }).start();
 }

 public myselfcircleview(context context, attributeset attrs) {
  this(context, attrs, 0);
 }

 public myselfcircleview(context context) {
  this(context, null);
 }
 
 @override
 protected void ondraw(canvas canvas) {
  super.ondraw(canvas);
  int centre = getwidth() / 2; // 获取圆心的x坐标 
  int radius = centre - circlewidth / 2;// 半径 
  mpaint.setstrokewidth(circlewidth); // 设置圆环的宽度 
  mpaint.setantialias(true); // 消除锯齿 
  mpaint.setstyle(paint.style.stroke); // 设置空心 
  rectf oval = new rectf(centre - radius, centre - radius, centre + radius, centre + radius); // 用于定义的圆弧的形状和大小的界限 
  if (!isnext) {// 第一颜色的圈完整，第二颜色跑 
   mpaint.setcolor(firstcolor); // 设置圆环的颜色 
   canvas.drawcircle(centre, centre, radius, mpaint); // 画出圆环 
   mpaint.setcolor(secondcolor); // 设置圆环的颜色 
   canvas.drawarc(oval, -90, mprogress, false, mpaint); // 根据进度画圆弧 
  } else { 
   mpaint.setcolor(secondcolor); // 设置圆环的颜色 
   canvas.drawcircle(centre, centre, radius, mpaint); // 画出圆环 
   mpaint.setcolor(firstcolor); // 设置圆环的颜色 
   canvas.drawarc(oval, -90, mprogress, false, mpaint); // 根据进度画圆弧 
  }
 }
 
}

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:zhy="http://schemas.android.com/apk/res/com.example.myselfview"
 android:layout_width="match_parent"
 android:layout_height="match_parent" >
 
 <com.example.myselfview.view.myselfcircleview 
  android:layout_width="120dp"
  android:layout_height="120dp"
  android:layout_margintop="20dp"
  android:layout_alignparenttop="true"
  android:layout_centerhorizontal="true"
  zhy:circlewidth="15dp"
  zhy:firstcolor="#d4f668"
  zhy:secondcolor="#2f9dd2"
  zhy:speed="10" /> 
 
 <com.example.myselfview.view.myselfcircleview 
  android:layout_width="200dp"
  android:layout_height="200dp"
  android:layout_alignparentbottom="true"
  android:layout_centerhorizontal="true"
  zhy:circlewidth="24dp"
  android:layout_marginbottom="40dp"
  zhy:firstcolor="#16a3fa"
  zhy:secondcolor="#d20f02"
  zhy:speed="5" /> 
 
</relativelayout>