java.lang.ClassCastException:android.graphics.drawable.BitmapDrawable无法转换为android.graphics.drawable.LayerDrawable [英] java.lang.ClassCastException: android.graphics.drawable.BitmapDrawable cannot be cast to android.graphics.drawable.LayerDrawable

问题描述

在这些代码上生成

错误: setBadgeCount(this，icon，"0");

这是我的代码:

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

    // Update LayerDrawable's BadgeDrawable

    setBadgeCount(this,icon ,"0");

解决方案

您会得到ClassCastException，因为您的MenuItem返回的不是BitmapDrawable，因此可以从MenuItem返回的BitmapDrawable中创建LayerDrawable/p>

根据此答案( https://stackoverflow.com/a/20138871/4142087 )或官方<一个href ="https://developer.android.com/reference/android/graphics/drawable/LayerDrawable.html" rel ="nofollow noreferrer">文档，您可以这样操作:

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

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");

解决方案

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");

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