blocks|key|5541368|text|我认为你在措辞上太过执着了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5541369|"ViewGroup“和"TextView”一样有理由继承"View“，以及"ImageView”或...更重要的是..."ScrollView“或"SurfaceView”(后两者都是“包含事物”)。|5541370|也许“视图”不一定是最佳的术语选择……但是类的继承性是完全有意义的。不管它的子类是什么名称:)|5541371|我的..。|5541372|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I think you're getting too hung up on the wording.

A "ViewGroup" has every bit as much reason to inherit from a "View" as a "TextView", and "ImageView" or ... more to the point ... a "ScrollView" or a "SurfaceView" (the latter two both "contain things").

Perhaps "View" wasn't necessarily the best choice of terms ... but the class heirarchy makes complete sense. Regardless of what it's subclasses are named :)

IMHO ...

blocks|key|1194577|text|我认为这是一个很好的复合设计模式的例子：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1194578|http://en.wikipedia.org/wiki/Composite_pattern|offset|length|1194579|即使命名可能不是最好的.|1194580|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1A|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

I think this is a great example of the Composite design pattern:

<a href="http://en.wikipedia.org/wiki/Composite_pattern" rel="nofollow">http://en.wikipedia.org/wiki/Composite_pattern</a>

Even though the naming might not be the best...

blocks|key|1192240|text|ViewGroup是View的(子类)，因为它可以以重要的方式用作视图：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1192241|1192242|它可以是布局XML文件中的元素|unordered-list-item|1192243|它可以显示在屏幕上(通过显示其子视图、自己的背景颜色等)|1192244|它与视图层次结构的其余部分一起膨胀|1192245|它可以用作活动的内容视图(通过view|1192246|1192247|所以它真的是一个View。|1192248|我同意类名ViewGroup有点令人困惑，因为它听起来像是一个组，而不是一个视图。将其命名为ViewGroupView可能更符合逻辑，尽管很笨拙。|1192249|1192250|为什么安卓的人把这种关系定义为继承而不是组合？因为ViewGroup包含视图，所以它不应该是复合的吗？|blockquote|1192251|1192252|1192253|在这种情况下，继承和组合并不是相互排斥的。ViewGroup是一个视图(继承)，而一个ViewGroup可以包含视图(组合)。|BOLD|1192254|entityMap^0|0|9|A|4|0|0|0|0|0|0|0|8|4|0|5|9|1A|D|0|0|0|0|0|13|2|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|1B|8|@]|D|@]|E|$]]|$1|J|3|K|5|I|7|1C|8|@]|D|@]|E|$]]|$1|L|3|M|5|I|7|1D|8|@]|D|@]|E|$]]|$1|N|3|O|5|I|7|1E|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1J|8|@$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]|$1|V|3|W|5|X|7|1P|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|Z|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]|$1|10|3|11|5|6|7|1S|8|@$9|1T|A|1U|B|12]]|D|@]|E|$]]|$1|13|3|-4|5|6|7|1V|8|@]|D|@]|E|$]]]|14|$]]

A <code>ViewGroup</code> is a (subclass of) <code>View</code> because it can serve as a view in important ways:

<ul>
<li>It can be an element in a layout XML file</li>
<li>It can be displayed on the screen (by displaying its child views, its own background color, etc.)</li>
<li>It gets inflated along with the rest of the view hierarchy</li>
<li>It can serve as an activity's content view (via <code>setContentView()</code>)</li>
</ul>

So it really is a <code>View</code>.

I agree that the classname <code>ViewGroup</code> is a bit confusing, because it sounds like it's a group, not a view. Calling it <code>ViewGroupView</code> might have been more logical, if unwieldy.

<blockquote>
 Why did folks at Android define this relationship as Inheritance instead of composition? As the ViewGroup contains Views shouldn't it be composition?
</blockquote>

In a case like this, inheritance and composition are not mutually exclusive. A ViewGroup is a View (inheritance) and a ViewGroup can contain Views (composition).

blocks|key|175656|text|阅读the+official+doc是金科玉律。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|175657|175658|+ViewGroup是一种特殊的视图，它可以包含其他视图(称为子视图)。视图组是布局和视图容器的基类。该类还定义了ViewGroup.LayoutParams类，该类用作layouts参数的基类。|blockquote|175659|175660|175661|175662|如果你仍然找不到它是什么，用谷歌图片搜索：|175663|​|175664|📷|atomic|175665|175666|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/view/ViewGroup.html|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/9d3fa19d426bd685744d58f13e48bd36.png|imageAlt^0|2|G|0|0|0|0|0|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|D|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|1B|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]|$1|I|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1F|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|1G|8|@]|9|@]|C|$]]|$1|O|3|P|5|Q|7|1H|8|@]|9|@$A|1I|B|1J|1|1K]]|C|$]]|$1|R|3|N|5|6|7|1L|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1M|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|11|W|12|C|$13|14|15|-4]]]]

Reading <a href="http://developer.android.com/reference/android/view/ViewGroup.html" rel="nofollow noreferrer">the official doc</a> is the golden rule.

<blockquote>
 A ViewGroup is a special view that can contain other views (called children.) The view group is the base class for layouts and views containers. This class also defines the ViewGroup.LayoutParams class which serves as the base class for layouts parameters.
</blockquote>

<hr>

If you still do not find out what it is, search with Google image:

<a href="https://i.stack.imgur.com/iUniq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iUniq.png" alt="enter image description here"></a>

blocks|key|1192192|text|Viewgroup继承视图的属性，并对其他视图和viewgroup执行更多操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1192193|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Viewgroup inherits properties of views and does more with other views and viewgroup

blocks|key|174102|text|ViewGroup是一种特殊的视图，可以包含其他视图。-视图组是布局和视图容器的基类-例如，RelativeLayout是包含TextView(视图)和其他布局的ViewGroup。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|174103|有关信息，请参阅链接：https://developer.android.com/reference/android/view/ViewGroup.html|offset|length|174104|视图代表用户界面组件的基本构建块，-It占据屏幕上的矩形，并负责绘制和处理事件。-示例包括EditText、按钮、TextView等|174105|有关信息，请参阅链接：https://developer.android.com/reference/android/view/View.html|174106|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/reference/android/view/ViewGroup.html|1|https://developer.android.com/reference/android/view/View.html^0|0|B|1V|0|0|0|B|1Q|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]]]

A ViewGroup is a special view that can contain other views.
- The view group is the base class for layouts and views containers
- For example, RelativeLayout is the ViewGroup that contains TextView(View), and other Layouts also.

refer link for info:
<a href="https://developer.android.com/reference/android/view/ViewGroup.html" rel="nofollow noreferrer">https://developer.android.com/reference/android/view/ViewGroup.html</a>

A View represents the basic building block for user interface components
-It occupies rectangle on the screen and is responsible for drawing and handling events.
- Examples are EditText, Button, TextView etc

refer link for info:
<a href="https://developer.android.com/reference/android/view/View.html" rel="nofollow noreferrer">https://developer.android.com/reference/android/view/View.html</a>

blocks|key|3926264|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3926265|安卓应用程序中的所有UI元素都是使用视图和ViewGroup+objects构建的。|offset|length|style|BOLD|3926266|3926267|View+:-视图是在屏幕上绘制用户可以交互的对象with.|ordered-list-item|3926268|ViewGroup+:-+ViewGroup用于保存视图和ViewGroups。|3926269|3926270|entityMap^0|0|I|2|L|9|0|0|0|4|0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|L|3|M|5|K|7|10|8|@$D|11|E|12|F|G]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$]]

<a href="https://i.stack.imgur.com/EWZaq.jpg" rel="nofollow noreferrer"></a>
All UI elements in an
Android app are built using View
and ViewGroup objects.
<ol>
<li>View :- A View is an object that draws
something on the screen that the
user can interact with.</li>
<li>ViewGroup :- ViewGroup is used to hold Views
and ViewGroups.</li>
</ol>

In Android <code>ViewGroup</code> inherits from <code>View</code>. A <code>ViewGroup</code> is a container which holds <code>Views</code>.

<pre><code>ViewGroup (LinearLayout)
View (TextView)
</code></pre>

Why did folks at Android defined this relationship as <code>Inheritance</code> instead of composition. As the <code>ViewGroup</code> contains <code>Views</code> shouldn't it be composition ?

Android View and ViewGroup

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在安卓系统中，ViewGroup继承了View。ViewGroup是一个容纳Views的容器。ViewGroup (LinearLayout)View (TextView)为什么安卓的人将这种关系定义为Inheritance而不是组合。因为ViewGroup包含Views，所以它不应该是组合吗？

问Android View和ViewGroup
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