Android空心圆及层叠效果实现代码

本文实例为大家分享了android空心圆及层叠效果的具体代码，供大家参考，具体内容如下

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);
 }
}

<?xml version="1.0" encoding="utf-8"?>
<relativelayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingbottom="@dimen/activity_vertical_margin"
 android:paddingleft="@dimen/activity_horizontal_margin"
 android:paddingright="@dimen/activity_horizontal_margin"
 android:paddingtop="@dimen/activity_vertical_margin"
 tools:context="com.bwei.test.zidingyiview2.mainactivity">

 <com.bwei.test.zidingyiview2.myview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"/>
</relativelayout>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。