在 xml android 中无法访问自定义视图属性

Question

我正在尝试在我的 CustomView 的 xml 中设置 drawable。但它没有显示我的 app:enableProgressRes="@drawable/vbequalizer_bg" 或 customname:enableProgressRes="@drawable/vbequalizer_bg"

我的意思是不包括自定义属性。当我们点击 Ctrl+Space android:attr 显示。

And i have tried including these namespaces one by one to the Root Layout.

xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:custom="http://schemas.android.com/apk/res-auto"
xmlns:customname="http://schemas.android.com/apk/res/zare.custom.views"

But my attributes aren't accessible in xml. by anyOne of them

This answer says ADT 17 后问题已解决。

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="VolumnBar">
        <attr name="disableProgressRes" format="integer" />
        <attr name="enableProgressRes" format="integer" />
    </declare-styleable>
</resources>

CustomView(VolumeBar) 构造函数

public VolumnBar(Context context, AttributeSet attributeset)
{
    super(context, attributeset);

    if(!isInEditMode())
    {
        TypedArray a = context.obtainStyledAttributes(attributeset, R.styleable.VolumnBar);//VolumnBar same name as Class Name

        try
        {
            drawableProgress = a.getDrawable(R.styleable.VolumnBar_disableProgressRes);

            drawableInvalidateProgress = a.getDrawable(R.styleable.VolumnBar_enableProgressRes);
        }
        catch (Exception e)
        {

        }
        finally
        {
            a.recycle();
        }
    }
}

Answer 1

可绘制资源的正确格式是 reference，不是 integer。将您的属性定义更改为如下内容：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="VolumnBar">
        <attr name="disableProgressRes" format="reference" />
        <attr name="enableProgressRes" format="reference" />
    </declare-styleable>
</resources>