创建自定义视图 [英] Creating custom view

问题描述

我想创建一个自定义视图 TestView 类中，我可以通过新TestView创建对象（）。 然而，一个新视图类需要的AttributeSet对象。从我在哪里拿到的AttributeSet？它必须包括？

I want to create a custom view TestView class for which I can create object via new TestView(). A new view class however needs a AttributeSet object. From where do I get that AttributeSet and what does it have to include?

推荐答案

这不是强制性的，大多数时候，你甚至不必担心它，只要你提供了从查看<构造函数/ code>是通过他们对超（）。

It's not mandatory, and most times you don't even have to worry about it as long as you provide constructors from View that pass them along to super().

public CustomView(Context context)  // No Attributes in this one.
{
  super(context);
  // Your code here
}

public CustomView(Context context, AttributeSet attrs)
{
  super(context, attrs);
  // Your code here
}

public CustomView(Context context, AttributeSet attrs, int default_style)
{
  super(context, attrs, default_style);
  // Your code here
}

查看需要做繁重的处理所有的 Android系统的保养要点：* 属性，你'添加视图布局当D通常是通过研究。你的构造能够利用这些属性，或者你自己，如果你定义了他们：

View takes care of doing the heavy lifting for dealing with all of the android:* attributes that you'd usually pass in when adding the view to a layout. Your constructors could make use of those attributes or your own if you've defined them:

<com.blrfl.CustomView
 android:id="@+id/customid"
 android:layout_weight="1"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:layout_gravity="center"
 blrfl:foo="bar"
 blrfl:quux="bletch"
/>

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