TypedArray Android中的矢量图像

Question

我在我的应用程序中使用自定义View，

我声明了这样的属性

<declare-styleable name="MySelectView">
    <attr name="selected" format="boolean" />
    <attr name="iconSize" format="dimension" />
    <attr name="imageSelected" format="reference" />
    <attr name="imageUnSelected" format="reference" />
    <attr name="vectorImageSelected" format="reference" />
    <attr name="vectorImageUnSelected" format="reference" />
    <attr name="setOnClickListener" format="boolean" />
</declare-styleable>

在我的View中，我获取的属性值如下所示。

 private void applyAttributeSet(AttributeSet attrs) {
        if (attrs == null) {
            return;
        }
        TypedArray a = context.getTheme().obtainStyledAttributes(
                attrs,
                R.styleable.MySelectView,
                0, 0);

        try {
            selected = a.getBoolean(R.styleable.MySelectView_selected, false);
            size = a.getDimension(R.styleable.MySelectView_iconSize, Util.dpToPx(size));

            selectedDrawable = a.getDrawable(R.styleable.MySelectView_imageSelected);
            unSelectedDrawable = a.getDrawable(R.styleable.MySelectView_imageUnSelected);


            setOnClickListener = a.getBoolean(R.styleable.MySelectView_setOnClickListener, true);
        } finally {
            a.recycle();
        }
    }




    <com.mathrusoft.infogo.widget.MySelectView
        android:id="@+id/favorite"
        android:layout_width="@dimen/news_item_bottom_view_size"
        android:layout_height="@dimen/news_item_bottom_view_size"
        android:layout_marginLeft="20dp"
        app:iconSize="@dimen/news_item_bottom_view_size"
        app:imageSelected="@drawable/ic_star_24dp"
        app:imageUnSelected="@drawable/ic_star_border_black_24dp"
        app:setOnClickListener="false" />

如果我在app:imageSelected或app:imageUnSelected发送正常的drawable，如果我发送了矢量图片，那么它可以正常工作，我在Exception

selectedDrawable = a.getDrawable(R.styleable.MySelectView_imageSelected);