发布于 2017-10-03 05:23:31 | 117 次阅读 | 评论: 0 | 来源: 网友投递

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Android移动端操作系统

Android是一种基于Linux的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由Google公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用“安卓”或“安致”。


这篇文章主要介绍了Android自定义VIew实现卫星菜单效果浅析,非常不错具有参考借鉴价值,需要的朋友可以参考下

 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PHPERZ网站的支持!



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