实现效果(灰色是背景色)：
1.attrs：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="XRingView">
<attr name="ring_color0" format="color"/>
<attr name="ring_color1" format="color"/>
<attr name="ring_color2" format="color"/>
<attr name="ring_color3" format="color"/>
<attr name="ring_color4" format="color"/>
<attr name="ring_max_progress" format="float"/>
<attr name="ring_color0_progress" format="float"/>
<attr name="ring_color1_progress" format="float"/>
<attr name="ring_color2_progress" format="float"/>
<attr name="ring_color3_progress" format="float"/>
<attr name="ring_color4_progress" format="float"/>
<attr name="ring_size" format="dimension"/>
<attr name="ring_isRank" format="boolean"/><!-- 是否排序-->
<attr name="ring_progress_background" format="color"/>
</declare-styleable>
</resources>2.JAVA代码：
/**
* created by: Eroch
* time: 2020/3/13
* introduce: 自定义圆环，最多支持同时5个颜色，index越大越上层，（如有需要，可自行修改代码）
*/
public class XRingView extends View {
float topAndBottomOffset;//XRingView的宽高
private float size;//进度条的的宽度
private Paint paint;//画笔
private float density;//当前手机屏幕密度
private Activity mActivity;
private float[] progressS;//当前所有的进度
private int[] colorS;//当前所有的进度条的颜色
private float component;//平均值
public XRingView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
this.mActivity = (Activity) context;
DisplayMetrics metrics = new DisplayMetrics();
mActivity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
density = metrics.density;
paint = new Paint();
paint.setStrokeCap(Paint.Cap.ROUND);//设置笔端样式
paint.setAntiAlias(true);//抗锯齿
paint.setDither(true);//抗抖动
paint.setFilterBitmap(false);//过滤bitmap，提高绘制速度
paint.setStyle(Paint.Style.STROKE);//设置画笔的样式
paint.setStrokeWidth(2);
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.XRingView);
if (array != null){
size = array.getDimension(R.styleable.XRingView_ring_size, 3 * density);
paint.setStrokeWidth(size*density);
int color0 = array.getColor(R.styleable.XRingView_ring_color0,0);
int color1 = array.getColor(R.styleable.XRingView_ring_color1,0);
int color2 = array.getColor(R.styleable.XRingView_ring_color2,0);
int color3 = array.getColor(R.styleable.XRingView_ring_color3,0);
int color4 = array.getColor(R.styleable.XRingView_ring_color4,0);
int background = array.getColor(R.styleable.XRingView_ring_progress_background,Color.parseColor("#10000000"));
paint.setColor(background);
colorS = new int[]{color0,color1,color2,color3,color4};
float progress0 = array.getFloat(R.styleable.XRingView_ring_color0_progress,0);
float progress1 = array.getFloat(R.styleable.XRingView_ring_color1_progress,0);
float progress2 = array.getFloat(R.styleable.XRingView_ring_color2_progress,0);
float progress3 = array.getFloat(R.styleable.XRingView_ring_color3_progress,0);
float progress4 = array.getFloat(R.styleable.XRingView_ring_color4_progress,0);
float maxProgress = array.getFloat(R.styleable.XRingView_ring_max_progress, 0);
component = 360 / maxProgress;
progressS = new float[]{progress0 *component, progress1*component, progress2*component, progress3*component, progress4*component};
boolean isRank = array.getBoolean(R.styleable.XRingView_ring_isRank, false);//是否需要防止进度大的把进度小的盖住，排一下序号
if (isRank) {
//冒泡
for (int i = 0; i < progressS.length - 1; i++) {
for (int j = 0; j < progressS.length - 1-i; j++) {
if (progressS[j] > progressS[j + 1]) {
float temp = progressS[j];
int color = colorS[j];
progressS[j] = progressS[j + 1];
colorS[j] = colorS[j +1];
progressS[j + 1] = temp;
colorS[j + 1] = color;
}
}
}
}
}
array.recycle();
}
//测量XRingView的宽高
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//wrap_content:-2
//match_parent:-1
int wi = getLayoutParams().width;
int he =getLayoutParams().height;
int width;
if (wi > 0 || he > 0){
width = he > wi ? he : wi;
}else {
width = (int) ((size * 2) + (10 * density));
}
float wh = ((wi>>1) - ((int)size>>1)) * density;
topAndBottomOffset = wh -((int)size>>1);（>>1是除以2的一次方，>>2是除以2的二次方，>>3是除以2的3次方，不理解的去看一下位移运算符）
setMeasuredDimension(width,width);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//270°是12点钟的位置
//四个参数分别是：左 上 右 下 起始度数 需要执行多少度数 是否铺满（true：画出来的是扇形或圆形 false：画出来的是圆环或弧） 画笔
canvas.drawArc( size,size,topAndBottomOffset,topAndBottomOffset,270,360,false,paint);
//遍历数据，画出圆弧
for (int i = progressS.length-1; i >0 ; i--) {
if (progressS[i] != 0){
paint.setColor(colorS[i]);
canvas.drawArc( size,size,topAndBottomOffset,topAndBottomOffset,270,progressS[i],false,paint);
}
}
}
}
end......
注意：这有个bug，就是XRing在XML里使用的时候，layout_width必须设置固定的值，至于是什么原因我不得而知，如有大佬知道，请留言指点，感谢感谢！