Android自定义VIew实现卫星菜单效果浅析

 一 概述：

最近一直致力于android自定义view的学习，主要在看《android群英传》，还有csdn博客鸿洋大神和wing大神的一些文章，写的很详细，自己心血来潮，学着写了个实现了类似卫星效果的一个自定义的view，分享到博客上，望各位指点一二。写的比较粗糙，见谅。（因为是在linux系统下写的，效果图我直接用手机拍的，难看，大家讲究下就看个效果，勿喷）。

先来看个效果图，有点不忍直视：

自定义view准备：

（1）创建继承自view的类;

（2）重写构造函数;

（3）定义属性。

（4）重写onmeasure(),onlayout()方法。

好了，废话不说了，准备上菜。

二 相关实现

首先是自定义的view，重写构造函数，我这里是直接继承的viewgroup，贴上代码：

public moonview(context context) { 
this(context,null); 
} 
public moonview(context context, attributeset attrs) { 
this(context, attrs,0); 
} 
public moonview(context context, attributeset attrs, int defstyleattr) { 
super(context, attrs, defstyleattr); 
}

这里需要读取自定义的属性，所以调用含三个参数的构造函数。

自定义的属性，我这里知定义了两个，一个是菜单弧形的半径，还有个是菜单在屏幕的位置，这里可以设置在左上角，左下角，右上角，右下角。代码如下：

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
<declare-styleable name="moonattrs"> 
<attr name="mradius" format="integer"></attr><!--菜单圆形半径--> 
<attr name="mposition"><!--卫星菜单屏幕所在位置--> 
<enum name="lefttop" value="-2"></enum><!--左上角--> 
<enum name="leftbottom" value="-1"></enum><!--左下角--> 
<enum name="righttop" value="-3"></enum><!--右上角--> 
<enum name="rightbottom" value="-4"></enum><!--右下角--> 
</attr> 
</declare-styleable> 
</resources>

然后在布局文件里面引用自定义的view，配置属性：

<?xml version="1.0" encoding="utf-8"?> 
<com.example.liujibin.testmyview3.myview.moonview 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:custom="http://schemas.android.com/apk/res/com.example.liujibin.testmyview3" 
android:orientation="vertical" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
custom:mradius="400" 
custom:mposition="rightbottom" 
> 
<imageview 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="@mipmap/sapi_icon_add_account"/> 
<imageview 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="@mipmap/sapi_icon_add_account"/> 
<imageview 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="@mipmap/sapi_icon_add_account"/> 
<imageview 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="@mipmap/sapi_icon_add_account"/> 
<imageview 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="@mipmap/sapi_icon_add_account"/> 
<imageview 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="@mipmap/sapi_icon_add_account"/> 
</com.example.liujibin.testmyview3.myview.moonview>

最后我们需要在自定义的view类中的构造函数里，获取相关的属性值：

public moonview(context context, attributeset attrs, int defstyleattr) { 
super(context, attrs, defstyleattr); 
//获取相关属性 
typedarray ta = context.gettheme().obtainstyledattributes(attrs, r.styleable.moonattrs, 
defstyleattr,0); 
mraius = ta.getint(r.styleable.moonattrs_mradius,500); 
position = ta.getint(r.styleable.moonattrs_mposition,-1); 
}

做完以上的准备工作，我们就可以对组件进行测量，布局。

@override 
protected void onmeasure(int widthmeasurespec, int heightmeasurespec) { 
super.onmeasure(widthmeasurespec, heightmeasurespec); 
count = getchildcount()-1; 
angle = 90/(count-1); 

int count = getchildcount(); 
for(int i =0;i< count;i++){ 
measurechild(getchildat(i),widthmeasurespec,heightmeasurespec); 
} 
}

count获取按钮的数量，有一个是中心点，不参与计算，angle是每个按钮离基准线的角度，这里以90度为准，固定在这个范围里面均匀分配。

首先先把中心点固定好位置：

@override 
protected void onlayout(boolean b, int i, int i1, int i2, int i3) { 
if(ischanged){ 
layoutbottom(); 
} 
} 
private void layoutbottom(){ 
view view = getchildat(0); 
switch (position){ 
case -1: 
btml = 0; 
btmt = getmeasuredheight() - view.getmeasuredheight(); 
btmr = view.getmeasuredwidth(); 
btmb = getmeasuredheight(); 
break; 
case -2: 
btml = 0; 
btmt = 0; 
btmr = view.getmeasuredwidth(); 
btmb = view.getmeasuredheight(); 
break; 
case -3: 
btml = getmeasuredwidth() - view.getmeasuredwidth(); 
btmt = 0; 
btmr = getmeasuredwidth(); 
btmb = view.getmeasuredheight(); 
break; 
case -4: 
btml = getmeasuredwidth() - view.getmeasuredwidth(); 
btmt = getmeasuredheight() - view.getmeasuredheight(); 
btmr = getmeasuredwidth(); 
btmb = getmeasuredheight(); 
break; 
} 
btmwidth = view.getmeasuredwidth(); 
btmheight = view.getmeasuredheight(); 
view.setonclicklistener(this); 
view.layout(btml,btmt,btmr,btmb); 
}

position的值看属性就明白了，对中心点进行固定位置。并且注册点击事件。

现在开始给剩下的按钮布局，并隐藏按钮：

@override 
protected void onlayout(boolean b, int i, int i1, int i2, int i3) { 
if(ischanged){ 
layoutbottom(); 
int count = getchildcount(); 
for(int k = 0;k < count - 1;k++){ 
view view = getchildat(k+1); 
int childwidth = view.getmeasuredwidth(); 
int childheight = view.getmeasuredheight(); 
int childx = (int)(mraius*(math.sin(angle*(k)*math.pi/180))); 
int childy = (int)(mraius*(math.cos(angle*(k)*math.pi/180))); 
int left = 0; 
int top = 0; 
int right = 0; 
int bottom = 0; 
switch(position){ 
case -1: 
left = childx+btmwidth/2-childwidth/2; 
top =getmeasuredheight() - (childy+childheight/2+btmheight/2); 
right = childx+btmwidth/2+childwidth/2; 
bottom =getmeasuredheight() - (childy + btmheight/2) + childheight/2; 
break; 
case -2: 
left = childx+btmwidth/2-childwidth/2; 
top =childy-childheight/2+btmheight/2; 
right = childx+btmwidth/2+childwidth/2; 
bottom = childy + btmheight/2 + childheight/2; 
break; 
case -3: 
left = getmeasuredwidth() - (childx+btmwidth/2+childwidth/2); 
top =childy-childheight/2+btmheight/2; 
right = getmeasuredwidth() - (childx+btmwidth/2+childwidth/2)+childwidth; 
bottom = childy + btmheight/2 + childheight/2; 
break; 
case -4: 
left = getmeasuredwidth() - (childx+btmwidth/2+childwidth/2); 
top =getmeasuredheight() - (childy+childheight/2+btmheight/2); 
right = getmeasuredwidth() - (childx+btmwidth/2+childwidth/2)+childwidth; 
bottom =getmeasuredheight() - (childy + btmheight/2) + childheight/2; 
break; 
} 
view.layout(left,top,right,bottom); 
view.setvisibility(view.gone); 
} 
} 
}

现在我们实现点击事件：

@override 
public void onclick(view view) { 
if(ischanged){ 
int count = getchildcount(); 
for(int i = 0;i < count - 1;i++){ 
view childview = getchildat(i+1); 
int childx = (int)(mraius*(math.sin(angle*(i)*math.pi/180))); 
int childy = (int)(mraius*(math.cos(angle*(i)*math.pi/180))); 
int childwidth = view.getmeasuredwidth(); 
int childheight = view.getmeasuredheight(); 
int left = 0; 
int top = 0; 
translateanimation ta = null; 
switch(position){ 
case -1: 
left = childx+btmwidth/2-childwidth/2; 
top =getmeasuredheight() - (childy+childheight/2+btmheight/2); 
ta = new translateanimation(-(left+childview.getmeasuredwidth()),0,getmeasuredheight()-top,0); 
break; 
case -2: 
left = childx+btmwidth/2-childwidth/2; 
top =childy-childheight/2+btmheight/2; 
ta = new translateanimation(-(left+childview.getmeasuredwidth()),0,-top,0); 
break; 
case -3: 
left = getmeasuredwidth() - (childx+btmwidth/2+childwidth/2); 
top =childy-childheight/2+btmheight/2; 
ta = new translateanimation(getmeasuredwidth()-(left+childview.getmeasuredwidth()),0,-top,0); 
break; 
case -4: 
left = getmeasuredwidth() - (childx+btmwidth/2+childwidth/2); 
top =getmeasuredheight() - (childy+childheight/2+btmheight/2); 
ta = new translateanimation(getmeasuredwidth()-(left+childview.getmeasuredwidth()),0,getmeasuredheight()-top,0); 
break; 
} 
ta.setduration(500); 
childview.setanimation(ta); 
childview.setvisibility(view.visible); 
} 
ischanged = false; 
}else{ 
int count = getchildcount(); 
for(int i = 0;i < count - 1;i++){ 
view childview = getchildat(i+1); 
int childx = (int)(mraius*(math.sin(angle*(i)*math.pi/180))); 
int childy = (int)(mraius*(math.cos(angle*(i)*math.pi/180))); 
int childwidth = view.getmeasuredwidth(); 
int childheight = view.getmeasuredheight(); 
int left = 0; 
int top = 0; 
translateanimation ta = null; 
switch(position){ 
case -1: 
left = childx+btmwidth/2-childwidth/2; 
top =getmeasuredheight() - (childy+childheight/2+btmheight/2); 
ta = new translateanimation(0,-(left+childview.getmeasuredwidth()),0,getmeasuredheight()-top); 
break; 
case -2: 
left = childx+btmwidth/2-childwidth/2; 
top =childy-childheight/2+btmheight/2; 
ta = new translateanimation(0,-(left+childview.getmeasuredwidth()),0,-top); 
break; 
case -3: 
left = getmeasuredwidth() - (childx+btmwidth/2+childwidth/2); 
top =childy-childheight/2+btmheight/2; 
ta = new translateanimation(0,getmeasuredwidth()-(left+childview.getmeasuredwidth()),0,-top); 
break; 
case -4: 
left = getmeasuredwidth() - (childx+btmwidth/2+childwidth/2); 
top =getmeasuredheight() - (childy+childheight/2+btmheight/2); 
ta = new translateanimation(0,getmeasuredwidth()-(left+childview.getmeasuredwidth()),0,getmeasuredheight()-top); 
break; 
} 
ta.setduration(500); 
childview.setanimation(ta); 
childview.setvisibility(view.gone); 
} 
ischanged = true; 
} 
}

设置点击显示以及隐藏，并且带飘动的动画效果。

四个角落效果如下：

以上所述是小编给大家介绍的android自定义view实现卫星菜单效果浅析，希望对大家有所帮助