从onBindViewHolder获取位置到Fragment [英] Get position from onBindViewHolder to Fragment
本文介绍了从onBindViewHolder获取位置到Fragment的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是我的FragmentA
添加图像使用户可以捕获图像并将其保存到电话外部存储中. newList是List，可从手机存储中检索所有图像，最后将其设置为适配器.
The add image allow user to capture image and save into phone external storage. The newList is a List which retrieve all the image from phone storage and finally set to adapter.
newList = retrieveCaptureImagePath()
myRecyclerView.setLayoutManager(
LinearLayoutManager(
getActivity(),
LinearLayoutManager.HORIZONTAL, false
)
)
myRecyclerView.setHasFixedSize(true);
myRecyclerView.setAdapter(ImageListAdapter(this, newList))
这是适配器类中的onBindViewHolder
override fun onBindViewHolder(holder: ViewHolder, p1: Int) {
context.longToast("position "+imgPics?.get(p1).toString())
val item = this!!.imgPics?.get(p1)
val bfOptions = BitmapFactory.Options()
bfOptions.inDither = false
bfOptions.inPurgeable =
true
bfOptions.inInputShareable =
true
bfOptions.inTempStorage = ByteArray(32 * 1024)
var fs: FileInputStream? = null
val file = File(imgPics?.get(p1).toString())
if (file.exists()) {
fs = FileInputStream(File(imgPics?.get(p1).toString()))
if (fs != null) {
var bm = BitmapFactory.decodeFileDescriptor(fs.fd, null, bfOptions)
holder.image?.setImageBitmap(bm)
}
}
with(holder.itemView) {
tag = item
}
}
在onBindViewHolder内部，我可以轻松获取图像路径
Inside onBindViewHolder, I can easily get the image path
context.longToast("position "+imgPics?.get(p1).toString())
但是当单击片段中的滴答动作栏时如何获得位置?
But how can I get the position when the tick action bar in fragment is clicked?
override fun onOptionsItemSelected(item: MenuItem): Boolean {
val id = item.itemId
if (id == R.id.save) {
for (i in newList?.size.toString()) {
val position = view?.tag
longToast(position.toString())
}
}
return super.onOptionsItemSelected(item)
}
我一直在显示空值.
修改
适配器类这样声明
class ImageListAdapter(
private val context: Fragment,
private val imgPics: MutableList<String>?,
private val mListener: ImageAdapterUIHandler?
) :
RecyclerView.Adapter<ImageListAdapter.ViewHolder>() {
private val mOnClickListener: View.OnClickListener
init {
mOnClickListener = View.OnClickListener { v ->
val item = v.tag as String
mListener?.onWorkRequestClicked(item)
}
}
override fun onCreateViewHolder(p0: ViewGroup, p1: Int): ViewHolder {
val view = LayoutInflater.from(p0.context)
.inflate(R.layout.grid_item, p0, false)
return ViewHolder(view)
}
override fun getItemCount(): Int{
return imgPics?.size!!
}
override fun onBindViewHolder(holder: ViewHolder, p1: Int) {
context.longToast("position "+imgPics?.get(p1).toString())
val item = this!!.imgPics?.get(p1)
val bfOptions = BitmapFactory.Options()
bfOptions.inDither = false //Disable Dithering mode
bfOptions.inPurgeable =
true //Tell to gc that whether it needs free memory, the Bitmap can be cleared
bfOptions.inInputShareable =
true //Which kind of reference will be used to recover the Bitmap data after being clear, when it will be used in the future
bfOptions.inTempStorage = ByteArray(32 * 1024)
var fs: FileInputStream? = null
val file = File(imgPics?.get(p1).toString())
if (file.exists()) {
fs = FileInputStream(File(imgPics?.get(p1).toString()))
if (fs != null) {
var bm = BitmapFactory.decodeFileDescriptor(fs.fd, null, bfOptions)
holder.image?.setImageBitmap(bm)
}
}
with(holder.itemView) {
tag = item
// setOnClickListener(mOnClickListener)
}
}
override fun getItemId(position: Int): Long {
return position.toLong()
}
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val image: ImageView = itemView.imageView2
}
interface ImageAdapterUIHandler{
fun onWorkRequestClicked(pos: String)
}
}
FragmentA
class FragmentA : BaseFragment(true),ImageListAdapter.ImageAdapterUIHandler {
override fun onWorkRequestClicked(pos: String) {
longToast(pos)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_create_work_request, container, false)
return view
}
@SuppressLint("ResourceAsColor")
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
activity.hideBottomNavigation()
........
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
inflater.inflate(R.menu.create_request, menu)
super.onCreateOptionsMenu(menu, inflater)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
val id = item.itemId
if (id == R.id.save) {
for (i in newList?.size.toString()) {
// get the position from adapter
}
}
return super.onOptionsItemSelected(item)
}
.....
}
推荐答案
创建接口
interface AddImageClickListener {
fun onClick(position: Int)
}
您的适配器类将是这样
class ImageListAdapter(var context: Context, var newList: ArrayList<ImageList>?,
var addImageClickListener: AddImageClickListener?) :
RecyclerView.Adapter<MyViewHolder>() {
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
holder.view.setOnClickListener({
addImageClickListener!!.onClick(position)
})
}
}
在片段类中实现AddImageClickListener
implement AddImageClickListener in your fragment class
然后像这样设置适配器 myRecyclerView.setAdapter(ImageListAdapter(this，newList)，this)
then set the adapter like this myRecyclerView.setAdapter(ImageListAdapter(this, newList),this)
并在AddImageClickListener的替代方法中，选择所选图像的位置
and in override method of AddImageClickListener, take the position of selected image
这篇关于从onBindViewHolder获取位置到Fragment的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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