我需要在我的应用中的RecyclerView
上方添加标题。用户滚动recyclerview时,标头必须移动(右图)。我已经搜索过,但没有找到最终的直接解决方案。最佳和最简单的实施方法是什么?
图片来源:link
为此,您有2个选择。
app:layout_behavior="@string/appbar_scrolling_view_behavior"
添加到RecyclerView中><androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <com.google.android.material.appbar.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content> <com.google.android.material.appbar.CollapsingToolbarLayout android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <ImageView android:layout_width="match_parent" android:layout_height="wrap_content"/> <androidx.appcompat.widget.Toolbar android:layout_width="match_parent" android:layout_height="?actionBarSize" app:layout_collapseMode="pin"/> </com.google.android.material.appbar.CollapsingToolbarLayout> </com.google.android.material.appbar.AppBarLayout> <androidx.recyclerview.widget.RecyclerView android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/transparent" android:fillViewport="true" app:layout_behavior="@string/appbar_scrolling_view_behavior"> </androidx.coordinatorlayout.widget.CoordinatorLayout>
- 第二个选项在滚动时将具有相同的效果,是在ReyclerViewAdapter中它可以理解2种viewType,一种用于图像,另一种用于项目,这样,您必须将图像作为项目的第一项传递列表
class CustomAdapter(
private var list: ArrayList<String>
) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
return if (viewType == VIEW_TYPE_ONE) {
ViewHolder1(LayoutInflater.from(context).inflate(R.layout.your_list_item_1, parent, false))
} else ViewHolder2(LayoutInflater.from(context).inflate(R.layout.your_list_item_2, parent, false))
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
if (position == 0) {
(holder as ViewHolder1).bind(position)
} else {
(holder as ViewHolder2).bind(position)
}
}
override fun getItemCount(): Int {
return list.size
}
override fun getItemViewType(position: Int): Int {
return if (position == 0) {
VIEW_TYPE_ONE
} else VIEW_TYPE_TWO
}
private inner class ViewHolder1 internal constructor(itemView: View) : RecyclerView.ViewHolder(itemView) {
var yourView: ImageView = itemView.findViewById(R.id.yourView)
fun bind(position: Int) {
yourView.setImageResource(list[position])
}
}
private inner class ViewHolder2 internal constructor(itemView: View) : RecyclerView.ViewHolder(itemView) {
var yourView: TextView = itemView.findViewById(R.id.yourView)
fun bind(position: Int) {
yourView.text = list[position]
}
}
companion object {
private const val VIEW_TYPE_ONE = 1
private const val VIEW_TYPE_TWO = 2
}