Android的自定义控件的命名空间问题 [英] Android Custom Control namespace issue

问题描述

我一直工作在自定义控件为Android，虽然我试图做什么的建议<一href="http://stackoverflow.com/questions/4495511/how-to-pass-custom-component-parameters-in-java-and-xml">here似乎有什么我做错了。

I've been working on a Custom Control for Android and although I tried to do what's suggested here there seems to be something I'm doing wrong.

下面是我的code，看是否有人能发现问题：

Here's my code to see if anyone can spot the problem:

MyComponent.java

public MyComponent(Context context, AttributeSet attrs) 
{
  super(context);
  TypedArray arr = context.obtainStyledAttributes(attrs, R.styleable.MyComponent); 
  CharSequence myId = arr.getString(R.styleable.MyComponent_identifier); 

  if (myId != null) 
  {   
    this.setIdentifier(myId.toString()); 
  }

  Integer cds = arr.getInteger(R.styleable.MyComponent_cd_number, 0);

  if(cds != null)
  {
    this.setCds(cds);
  }

  arr.recycle();
 }

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>   
   <declare-styleable name="MyComponent">     
    <attr name="cd_number" format="integer" />   
    <attr name="identifier" format="string" />
   </declare-styleable> 
</resources> 

的main.xml

<TableLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:bgl="http://schemas.android.com/apk/res/my.test.package.components"
  android:id="@+id/table"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  ...

  <my.test.package.MyComponent 
     android:id="@+id/hand"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_span="2"
        bgl:cd_number="4"
        bgl:identifier="plr"/>

   ...

  </TableLayout>

当我把这个我收到以下错误：

When I put this I get the following errors:

错误：没有在包中my.test.package发现属性cd_number'资源标识符 错误：没有在包中my.test.package

error: No resource identifier found for attribute 'cd_number' in package 'my.test.package' error: No resource identifier found for attribute 'identifier' in package 'my.test.package'

如果我改变我的名字空间是这样的：

If I change my namespace to something like:

xmlns:bgl="http://schemas.mywhatever.com/apk/res/my.test.package"

...错误走的路和东西运行，但身份识别码为空和CDS为0（默认值！）回到了MyComponent.java构造。

...the errors go way and the thing runs but myId is null and cds is 0 (the default value!) back on the MyComponent.java constructor.

我会说这是一些很基本的错误，但我不能够发现它，因为没有太多的文件在此，我决定在这里问。

I'd say it's some very basic mistake but I not being able to spot it and since there's not much documentation on this I decided to ask here.

在此先感谢！

推荐答案

确定。我把它解决了！

Ok. I got it solved!

在原来的职位我有：

xmlns:bgl="http://schemas.android.com/apk/res/my.test.package

......但在我的源代码我有：

...but in my source I had:

xmlns:bgl="http://schemas.android.com/apk/res/my.test.package.components

......，因为我认为我们应该把URI的组件包。

...because I thought one should put the URI to the components package.

这是错误的！

在的xmlns应该是已在清单中声明该应用程序名！

On the xmlns it should be the application name as is declared on the Manifest!

当我删除它匹配清单中的应用程序名称的xmlns的组件部分和错误走了，当我跑的东西在调试我真能看到我是路过的参数值在XML！

When I removed the "components" part of the xmlns it "matched" the application name in the Manifest and the errors went away and when I ran the thing in debug I could actually see the values I was passing to the parameters in the XML!

希望这可以帮助别人！ ： - ）

Hope this helps someone else! :-)

更新

后来我有必要控制移动到库，并再次面临的问题。看来，当你把库中的元件，并用它在客户端应用程序，你必须声明的xmlns如下：

Later on I had the need to move the control into a library and faced the problem again. It seems that when you put the component in a library and use it on a client app you must declare the xmlns as below:

 xmlns:myns="http://schemas.android.com/apk/res-auto"

如果你这样做（并宣布为Android的依赖库）的Eclipse（或者是Android的？）将搜索依赖适当的属性绑定。

If you do so (and have the library declared as an Android dependency) Eclipse (or is it Android?) will search the dependencies for the appropriate attribute bindings.

这篇关于Android的自定义控件的命名空间问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！