Android空心圆及层叠效果实现代码

package com.bwei.test.zidingyiview2;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;


public class MyView extends View {
 private Context mcontext;
 private Paint mpaint;

 public MyView(Context context) {
  super(context);
 }

 public MyView(Context context, AttributeSet attrs) {
  super(context, attrs);
 }

 public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  this.mcOntext= context;
 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
//  得到屏幕宽高
  float wi = canvas.getWidth() / 2;
  float he = canvas.getHeight() / 2;
//  创建第一个画笔
  Paint pa = new Paint();
//  上色
  pa.setColor(Color.GREEN);
//  显示圆边
  pa.setAntiAlias(true);
//  设置空心圆环
  pa.setStyle(Paint.Style.STROKE);
//  设置圆环宽度
  pa.setStrokeWidth(6);
  Paint pa2 = new Paint();
  pa2.setColor(Color.BLUE);
  pa2.setAntiAlias(true);
  Paint pa3 = new Paint();
  pa3.setColor(Color.BLACK);
  pa3.setAntiAlias(true);
//  画什么圆
  canvas.drawCircle(wi-85, he-85, 80, pa2);
  canvas.drawCircle(wi, he, 100, pa);
  canvas.drawCircle(wi+110, he+110, 120, pa3);
 }
}

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