Android的 - 编写自定义（化合物）成分 [英] Android - Writing a custom (compound) component
问题描述
Android的应用程序，我目前正在开发具有增长相当大的一个主要活动。这主要是因为它包含了一个 TabWidget 有3个标签。每个标签都有相当多的部件。活动具有控制所有这些部件中的一次。所以我觉得你可以想像，这一活动已经像20场（几乎每一个组件的字段）。此外，它含有大量的逻辑（点击监听器，逻辑填写列表等）。
The Android app I'm currently developing has a main activity that has grown quite large. This is mainly because it contains a TabWidget with 3 tabs. Each tab has quite a few components. The activity has to control of all those components at once. So I think you can imagine that this Activity has like 20 fields (a field for almost every component). Also it contains a lot of logic (click listeners, logic to fill lists, etc).
我通常做的基于组件框架是分割一切成自定义组件。每个自定义组件然后将有明确的责任。它会包含它自己的一套组件和所有其他相关的逻辑该组件。
What I normally do in component based frameworks is to split everything up into custom components. Each custom component would then have a clear responsibility. It would contain it's own set of components and all other logic related to that component.
我试图找出如何可以做到这一点，我发现了一些在Android文档什么，他们喜欢称之为复合控制研究。 （请参阅<一个href="http://developer.android.com/guide/topics/ui/custom-components.html#compound">http://developer.android.com/guide/topics/ui/custom-components.html#compound并滚动到复合控件一节），我想基于XML文件中定义的视图结构来创建这样一个组成部分。
I tried to figure out how this can be done, and I found something in the Android documentation what they like to call a "Compound Control". (See http://developer.android.com/guide/topics/ui/custom-components.html#compound and scroll to the "Compound Controls" section) I would like to create such a component based on an XML file defining the view structure.
在文档，它说：
注意，就像处理活动， 您可以使用声明 （基于XML的）的方式来创建 包含的组件，或者你可以嵌套 他们编程方式从您的code。
Note that just like with an Activity, you can use either the declarative (XML-based) approach to creating the contained components, or you can nest them programmatically from your code.
嗯，这是个好消息！基于XML的方法正是我想要的！但它没有说怎么办呢，除了它是像一个活动......但我做的一个活动就是调用的setContentView（...）膨胀从XML的观点。这个方法不可用，如果你如子类的LinearLayout 。
Well, that's good news! The XML-based approach is exactly what I want! But it doesn't say how to do it, except that it is "like with an Activity"... But what I do in an Activity is call setContentView(...) to inflate the views from XML. That method is not available if you for example subclass LinearLayout.
于是，我就手动充气XML是这样的：
So I tried to inflate the XML manually like this:
public class MyCompoundComponent extends LinearLayout {
public MyCompoundComponent(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.my_layout, this);
}
}
这只是我是在加载XML有事实的LinearLayout 声明为根元素的作品。这导致虚增的LinearLayout 是 MyCompoundComponent 的孩子这本身就已经是一个的LinearLayout ！所以，现在我们之间有 MyCompoundComponent 冗余的LinearLayout中，它实际需要。
This works, except for the fact that the XML I'm loading has LinearLayout declared as the root element. This results in the inflated LinearLayout being a child of MyCompoundComponent which itself already is a LinearLayout!! So now we have a redundant LinearLayout in between MyCompoundComponent and the views it actually needs.
有人可以请给我提供一个更好的方式来处理这一点，避免有多余的的LinearLayout 实例？
Can somebody please provide me with a better way to approach this, avoiding having a redundant LinearLayout instantiated?
推荐答案
使用合并标记作为XML根
Use merge tag as your XML root
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Your Layout -->
</merge>
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