java.lang.ClassCastException：android.graphics.drawable.BitmapDrawable无法转换为android.graphics.drawable.LayerDrawable

Question

error is generated on these code : setBadgeCount(this,icon ,"0");

here is my code:

  MenuItem itemCart = menu.findItem(R.id.action_cart);
    LayerDrawable icon = (LayerDrawable) itemCart.getIcon();

    // Update LayerDrawable's BadgeDrawable

    setBadgeCount(this,icon ,"0");

Answer 1

You get ClassCastException because your MenuItem returns not BitmapDrawable , you can create LayerDrawable from BitmapDrawable you get from MenuItem

According to this answer ( https://stackoverflow.com/a/20138871/4142087 ), or official documentation you can do it this way:

BitmapDrawable iconBitmap = (BitmapDrawable) itemCart.getIcon();
LayerDrawable iconLayer = new LayerDrawable(new Drawable [] { iconBitmap });
setBadgeCount(this, iconLayer, "0");

Answer 2

Change the menu items icon drawable from vector drawable to layer-list. In the layer list you can include the vector items like this. Here the cart icon is a vector.

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@drawable/cart_icon"
        android:gravity="center" />
    <item
        android:id="@+id/ic_badge"
        android:drawable="@drawable/cart_icon" />
</layer-list>