Android 获取从onBindViewHolder到片段的位置
这是我的Android 获取从onBindViewHolder到片段的位置,android,kotlin,android-recyclerview,Android,Kotlin,Android Recyclerview,这是我的片段a 添加图像允许用户捕获图像并保存到手机外部存储器中。newList是一个List列表,它从手机存储器中检索所有图像,并最终设置为adapter newList = retrieveCaptureImagePath() myRecyclerView.setLayoutManager( LinearLayoutManager( getActivity(), LinearL
片段a
添加图像允许用户捕获图像并保存到手机外部存储器中。newList
是一个List
列表,它从手机存储器中检索所有图像,并最终设置为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中,我可以很容易地获得图像路径
context.longToast("position "+imgPics?.get(p1).toString())
但是,当单击片段中的勾号操作栏时,如何获取位置
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
编辑
适配器类声明如下
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)
}
}
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)
})
}
}
创建一个接口
interface AddImageClickListener {
fun onClick(position: Int)
}
您的适配器类如下所示
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)
}
}
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)
})
}
}
类ImageListAdapter(var-context:context,var-newList:ArrayList?,
变量addImageClickListener:addImageClickListener?:
RecyclerView.Adapter(){
覆盖onBindViewHolder(holder:MyViewHolder,位置:Int){
holder.view.setOnClickListener({
addImageClickListener!!.onClick(位置)
})
}
}
在片段类中实现AddImageClickListener
然后像这样设置适配器
setAdapter(ImageListAdapter(this,newList),this)
在AddImageClickListener的覆盖方法中,获取适配器中选定图像的位置
override fun onBindViewHolder(holder: SideMenuAdapter.ViewHolder, position: Int) {
holder.bindItems(arrayList.get(position))
if (selected==position){
holder.itemView.frame_sidemenu.setBackgroundResource(R.drawable.sidemnubg)
}else{
holder.itemView.frame_sidemenu.setBackgroundResource(R.color.transparent)
}
holder.itemView.frame_sidemenu.setOnClickListener{
holder.itemView.frame_sidemenu.setBackgroundResource(R.drawable.sidemnubg)
val posEvent = PosEvent()
posEvent.pos = position
EventBus.getDefault().post(posEvent)
}
}
零碎
@Subscribe(threadMode = ThreadMode.MAIN)
fun onMessageEvent(posEvent: PosEvent) {
drawerLayout.closeDrawer(Gravity.LEFT)
openFragments(posEvent.pos)
// showToast(arrayList[position])
selectednavPosition = posEvent.pos
val adapter_menu: SideMenuAdapter =
SideMenuAdapter(this@MainActivity,arrayList,selectednavPosition)
recycler_menu.adapter = adapter_menu
}
override fun onResume() {
super.onResume()
EventBus.getDefault().register(this)
}
override fun onPause() {
super.onPause()
EventBus.getDefault().unregister(this)
}
事件
你想知道所选图像在碎片中的位置吗?@primo ya……检查我的答案。这可能会对您有所帮助。我希望在单击碎片操作栏中的“保存”按钮时获得位置,而不是在
holder.view中,但您必须在recyclerview中选择要保存的图像。正确吗?添加映像不是在适配器中创建的。它是在fragmentA中创建的。xml
。或者您知道如何首先在适配器中创建plus映像吗?那个么我就可以使用你们的解决方案了?对于你们所做的任何事情,无论你们是在适配器中还是在片段中创建plus镜像,你们都需要一个接口来获取从适配器类到片段的位置。欢迎来到SO。虽然这段代码片段可能是解决方案,但包含解释确实有助于提高文章的质量。请记住,您将在将来回答读者的问题,这些人可能不知道您的代码建议的原因。请查看更多详细信息。