如何在自定义视图中获得“android：”标记值

There seems to be a lot of "similar" questions and answers to this scattered around which all refer to how to get a custom attribute from an AttributeSet. What I haven't been able to find so far is how to get an android: namespace tag:

似乎有很多“类似”的问题和答案分散在其中，所有问题都涉及如何从AttributeSet获取自定义属性。到目前为止我无法找到的是如何获取android：namespace标签：

    <com.custom.view.StatusThumbnail
        android:id="@+id/statusThumbnailContainer"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:layout_weight="1"/>

I would like to pull back the layout_height attribute from this custom component. Unfortunately from what I've read the closest I've got to how to do this is:

我想从此自定义组件中拉回layout_height属性。不幸的是，根据我所读到的，我最接近的方法是：

public StatusThumbnail(Context context, AttributeSet attrs) {
    super(context, attrs);

    String height = attrs.getAttributeValue("android", "layout_height");

But this returns null.

但是这会返回null。

Surely this isn't a rare thing to try and do?

当然这不是一件罕见的事情吗？

2 个解决方案

#1

The namespace should be "http://schemas.android.com/apk/res/android" android is an alias declared in your xml file

命名空间应为“http://schemas.android.com/apk/res/android”android是在xml文件中声明的别名

#2

-1

First declare required attributes in :

首先声明所需的属性：

res\attrs.xml

水库\ attrs.xml

    <declare-styleable name="StatusThumbnail">
        <attr name="statusThumbnailattr" format="string"/>
    </declare-styleable>

then in your XML layout declaration use the same attribute

然后在您的XML布局声明中使用相同的属性

<com.custom.view.StatusThumbnail
        android:id="@+id/statusThumbnailContainer"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        statusThumbnailattr="some value"
        android:layout_weight="1"/>

Access using

访问使用

public StatusThumbnail(Context context, AttributeSet attrs) {
    super(context, attrs);
TypedArray a=context.obtainStyledAttributes(attrs,R.styleable.StatusThumbnail);
this.mdColorDialogTitle=a.getString(R.styleable.StatusThumbnail_statusThumbnailattr);
}

#1