如何将所有媒体从 phone 的图库加载到片段中的回收站视图

Question

我使用视图寻呼机在 activity 中制作了片段，并在其中添加了网格布局回收器视图。我想加载我的画廊的所有媒体（视频和图像）以显示在该回收站视图中。我该怎么做？

这是它的样子。

我希望我的 phone 图库中的所有媒体显示在这个网格回收器视图中，以代替这些图像。

这是我的回收站查看代码：

适配器代码：

package com.nandini.android.fragmentstab

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import androidx.recyclerview.widget.RecyclerView

class CustomAdapter(var imageList: ArrayList<ItemViewModel>):RecyclerView.Adapter<CustomAdapter.ViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CustomAdapter.ViewHolder {

        var view= LayoutInflater.from(parent.context).inflate(R.layout.item_view_photo,parent,false)
//        return RecyclerView.ViewHolder(view)
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: CustomAdapter.ViewHolder, position: Int) {
        var itemViewModel:ItemViewModel = imageList[position]
        holder.imageView.setImageResource(itemViewModel.image)
    }

    override fun getItemCount(): Int {
        return imageList.size
    }

    class ViewHolder(ItemView: View) : RecyclerView.ViewHolder(ItemView) {
        val imageView: ImageView = itemView.findViewById(R.id.img_itm)
    }

}

项目数据class:

package com.nandini.android.fragmentstab

data class ItemViewModel(val image:Int) {
}

片段适配器代码：

package com.nandini.android.fragmentstab

import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentStatePagerAdapter

class FragmentAdapter(fm:FragmentManager):FragmentStatePagerAdapter(fm,
    BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {

    var fragmentList : ArrayList<Fragment> = ArrayList()
    var fragmenttitle:ArrayList<String> = ArrayList()


    override fun getCount(): Int {
        return  fragmentList.size
    }

    override fun getItem(position: Int): Fragment {
        return fragmentList[position]
    }

    override fun getPageTitle(position: Int): CharSequence? {
        return fragmenttitle[position]
    }

    fun addFragment(fragment: Fragment,title:String){
        fragmentList.add(fragment)
        fragmenttitle.add(title)
    }

}

片段kt文件：

package com.nandini.android.fragmentstab

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView

// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"

/**
 * A simple [Fragment] subclass.
 * Use the [AllFragment.newInstance] factory method to
 * create an instance of this fragment.
 */

class AllFragment : Fragment() {



    // TODO: Rename and change types of parameters
    private var param1: String? = null
    private var param2: String? = null

//    var recyclerView= activity?.findViewById<RecyclerView>(R.id.recyclerView)
//    var adapter:RecyclerView.Adapter<CustomAdapter.ViewHolder>?=null
//    var data = ArrayList<ItemViewModel>()

    lateinit var recyclerView:RecyclerView
     var dataList:ArrayList<ItemViewModel> = ArrayList<ItemViewModel>()
     var adapterr:RecyclerView.Adapter<CustomAdapter.ViewHolder>?=null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        arguments?.let {
            param1 = it.getString(ARG_PARAM1)
            param2 = it.getString(ARG_PARAM2)
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment

        var view:View=inflater.inflate(R.layout.fragment_all, container, false)
        recyclerView=view.findViewById(R.id.recyclerView)
        recyclerView.layoutManager=GridLayoutManager(activity,3)
        for(i in 1..50){
            dataList.add(ItemViewModel(R.drawable.image_thumbnail))
        }

        recyclerView.adapter=adapterr
        adapterr=CustomAdapter(dataList)

        return view
    }


    companion object {
        /**
         * Use this factory method to create a new instance of
         * this fragment using the provided parameters.
         *
         * @param param1 Parameter 1.
         * @param param2 Parameter 2.
         * @return A new instance of fragment PhotosFragment.
         */
        // TODO: Rename and change types and number of parameters
        @JvmStatic
        fun newInstance(param1: String, param2: String) =
            AllFragment().apply {
                arguments = Bundle().apply {
                    putString(ARG_PARAM1, param1)
                    putString(ARG_PARAM2, param2)
                }
            }
    }
}

图库代码 class：

import android.content.Context
import android.database.Cursor
import android.provider.MediaStore
import androidx.core.content.ContentProviderCompat.requireContext
import java.security.AccessController.getContext

class ImageGallery {
    public fun listOfImages(context: Context) : ArrayList<String> {
        var imageList: ArrayList<String> = ArrayList()
        var projection = arrayOf(MediaStore.MediaColumns.DATA,MediaStore.Images.Media.BUCKET_DISPLAY_NAME)
        var orderBy:String=MediaStore.Video.Media.DATE_TAKEN
            val imagecursor: Cursor = getContext().contentResolver.managedQuery(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, null,
                null, orderBy+"DESC"
            )
            for (i in 0 until imagecursor.count) {
                imagecursor.moveToPosition(i)
                val dataColumnIndex =
                    imagecursor.getColumnIndex(MediaStore.Images.Media.DATA)
                imageList.add(imagecursor.getString(dataColumnIndex))
            }
            return imageList
        }
    }

Answer 1

To Fetch Images

var imageList: ArrayList<String> = ArrayList()
fun fetchImages(): ArrayList<String> {
    val columns = arrayOf(MediaStore.Images.Media.DATA, 
    MediaStore.Images.Media._ID)
    val imagecursor: Cursor = requireActivity().managedQuery(
        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null,
        null, ""
    )
    for (i in 0 until imagecursor.count) {
        imagecursor.moveToPosition(i)
        val dataColumnIndex = 
        imagecursor.getColumnIndex(MediaStore.Images.Media.DATA)
        imageList.add(imagecursor.getString(dataColumnIndex))
    }
return imageList
}

To Fetch Videos

var videoList: ArrayList<String> = ArrayList()
    fun fetchVideos: ArrayList<String> {
        val columns = arrayOf(MediaStore.Video.Media.DATA, 
        MediaStore.Video.Media._ID)
        val imagecursor: Cursor = requireActivity().managedQuery(
            MediaStore.Video.Media.EXTERNAL_CONTENT_URI, columns, null,
            null, ""
        )
        for (i in 0 until imagecursor.count) {
            imagecursor.moveToPosition(i)
            val dataColumnIndex = 
            imagecursor.getColumnIndex(MediaStore.Video.Media.DATA)
            videoList.add(imagecursor.getString(dataColumnIndex))
        }
    return videoList
    }

只需连接然后随机排列所有片段或任何场景的数组

Pass these arrays in your adapter

Glide.with(context).load(list.get(position)).into(holder.img_thumbnail)

希望对您有所帮助 :) 如果您有任何疑问，请随时提问。

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