Question

我的适配器将图像正确地应用于RecyclerView并正确滚动...直到添加大量项目为止。然后，它变得非常不稳定，我知道这是我的方法的问题。请参见下面的代码：

class FragmentMenuViewAdapter(private val menuItems: ArrayList<MenuItemModel>, private val clickListener: (MenuItemModel) -> Unit) : RecyclerView.Adapter<FragmentMenuViewAdapter.CustomViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CustomViewHolder {

        val policy = StrictMode.ThreadPolicy.Builder().permitAll().build()
        StrictMode.setThreadPolicy(policy)

        val layoutInflater = LayoutInflater.from(parent.context)
        val cellForRow = layoutInflater.inflate(R.layout.recyclerview_list_items, parent, false)
        return CustomViewHolder(cellForRow)
    }

    override fun getItemCount(): Int {

        return menuItems.size
    }

    override fun onBindViewHolder(holder: CustomViewHolder, position: Int) {

        var menuItemIconURI = RouteManager.mAppModel?.resourcesURL + menuItems[position].icon

        menuItemIconURI = menuItemIconURI.replace("\$platform", "iOS")
        menuItemIconURI = menuItemIconURI.replace("\$scale", "@3x")

        val inputStream = URL(menuItemIconURI).openStream()
        holder.view.menuButton.setImageBitmap(BitmapFactory.decodeStream(inputStream))
        holder.bind(menuItems[position], clickListener)
    }

class CustomViewHolder(val view: View): RecyclerView.ViewHolder(view) {

        fun bind(menuItem: MenuItemModel, clickListener: (MenuItemModel) -> Unit) {
            view.setOnClickListener{clickListener(menuItem)}
        }
    }
}

正在通过URL链接设置图像。我可以使用它，但是我怀疑我在某个地方犯了新手错误，或者只是采取了错误的方法。任何有关如何调整我的代码的建议将不胜感激。

Answer 1

我认为问题出在主线程中解码位图图像。尝试改用Glide。它有助于我们在需要时异步加载图像。例如，如果您想快速滚动RecyclerView，则不需要解码并显示所有图像。此外，它还具有缓存机制以使此过程更流畅。

build.gradle

dependencies {
    implementation 'com.github.bumptech.glide:glide:4.7.1'
}

FragmentMenuViewAdapter.kt

override fun onBindViewHolder(holder: CustomViewHolder, position: Int) {

    var menuItemIconURI = RouteManager.mAppModel?.resourcesURL + menuItems[position].icon

    menuItemIconURI = menuItemIconURI.replace("\$platform", "iOS")
    menuItemIconURI = menuItemIconURI.replace("\$scale", "@3x")

    Glide.with(holder.view.menuButton.context)
        .load(menuItemIconURI)
        .into(holder.view.menuButton)

    holder.bind(menuItems[position], clickListener)
}

Kotlin：回收站视图不连贯

1 个答案: