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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对呐喊教程网站的支持！

声明：本文内容来源于网络，版权归原作者所有，内容由互联网用户自发贡献自行上传，本网站不拥有所有权，未作人工编辑处理，也不承担相关法律责任。如果您发现有涉嫌版权的内容，欢迎发送邮件至：notice#nhooo.com（发邮件时，请将#更换为@）进行举报，并提供相关证据，一经查实，本站将立刻删除涉嫌侵权内容。

基础教程