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>

来源：http://blog.csdn.net/wyj1369/article/details/78173015