获取样式属性中使用的可绘制引用的资源ID

Having this custom view MyView I define some custom attributes:

拥有此自定义视图MyView我定义了一些自定义属性:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="MyView">
        <attr name="normalColor" format="color"/>
        <attr name="backgroundBase" format="integer"/>
    </declare-styleable>   
</resources>

And assign them as follows in the layout XML:

并在布局XML中按如下方式分配它们:

    <com.example.test.MyView
        android:id="@+id/view1"
        android:text="@string/app_name"
        . . .
        app:backgroundBase="@drawable/logo1"
        app:normalColor="@color/blue"/>

At first I thought I can retrieve the custom attribute backgroundBase using:

起初我以为我可以使用以下方法检索自定义属性backgroundBase:

TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.MyView, defStyle, 0);
int base = a.getInteger(R.styleable.MyView_backgroundBase, R.drawable.blank);

Which works only when the attribute is not assigned and the default R.drawable.blank is returned.
When app:backgroundBase is assigned an exception is thrown "Cannot convert to integer type=0xn" because, even though the custom attribute format declares it as integer, it really references a Drawable and should be retrieved as follows:

仅在未分配属性且返回默认R.drawable.blank时才有效。当app:backgroundBase被赋值时,抛出异常“无法转换为整数类型= 0xn”,因为即使自定义属性格式将其声明为整数,它实际上引用了Drawable,应该按如下方式检索:

Drawable base = a.getDrawable(R.styleable.MyView_backgroundBase);
if( base == null ) base = BitMapFactory.decodeResource(getResources(), R.drawable.blank);

And this works.
Now my question:
I really don't want to get the Drawable from the TypedArray, I want the integer id corresponding to app:backgroundBase (in the example above it would be R.drawable.logo1). How can I get it?

这很有效。现在我的问题:我真的不想从TypedArray获取Drawable,我想要对应于app:backgroundBase的整数id(在上面的例子中它将是R.drawable.logo1)。我怎么才能得到它?

1 个解决方案

#1

It turns out that the answer was right there:

事实证明答案就在那里:

TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.MyView, defStyle, 0);
int base = a.getResourceId(R.styleable.MyView_backgroundBase, R.drawable.blank);