在Android 4上，无法从自定义视图中的TypedArray获取可绘制内容

我已经为我的自定义视图声明了一些自定义属性

<declare-styleable name="MenuItemView">
    <attr name="item_icon" format="reference" />
    <attr name="item_title_color" format="reference" />
</declare-styleable>

然后我试着把它画出来

public void initView(Context context, TypedArray a) {
    inflate(context, R.layout.menu_item, this);

    this.title = findViewById(R.id.tvTitle);
    this.icon = findViewById(R.id.ivIcon);

    try {
        title.setTextColor(a.getColor(R.styleable.MenuItemView_item_title_color, getResources().getColor(R.color.midnight_black)));
        Drawable iconDrawable = a.getDrawable(context, R.styleable.MenuItemView_item_icon);
        ...
    } finally {
        a.recycle();
    }

}

在我的手机上，一切正常，但在安卓4上，它只是说

Caused by: android.content.res.Resources$NotFoundException: File res/drawable/ic_profile_circle.xml from drawable resource ID #0x7f08012b

我发现了一个非常棘手的方法来解决这个问题，将属性类型从引用切换到字符串，然后做一些不好的事情

 String indentifier = a.getString(R.styleable.MenuItemView_item_icon);
 indentifier = indentifier.replace(".xml", "").replace("res/drawable/", "");
 int id = context.getResources().getIdentifier(indentifier, "drawable", context.getPackageName());
 Drawable iconDrawable = ContextCompat.getDrawable(context, id);

---

只需为您的视图设置颜色和图标即可

    int titleColorId = a.getResourceId(R.styleable.MenuItemView_item_title_color, getResources().getColor(R.color.midnight_black));
    int iconId = a.getResourceId(R.styleable.MenuItemView_item_icon, -1);

    title.setTextColor(titleColorId);
    if (iconId != -1)
        icon.setImageResource(iconId);

    int titleColorId = a.getResourceId(R.styleable.MenuItemView_item_title_color, getResources().getColor(R.color.midnight_black));
    int iconId = a.getResourceId(R.styleable.MenuItemView_item_icon, -1);

    title.setTextColor(titleColorId);
    if (iconId != -1)
        icon.setImageResource(iconId);