如何从 RecyclerView 读取数据并发送到 BottomSheet

Question

我正在使用 recyclerView 来显示设备中安装的应用列表

图片 - Link

关于更多细节，我在 LongPress 上使用 bottomSheet，即在 ViewHolder 类中，但 如何将所选选项卡的数据发送到 bottomSheet 并提供更多详细信息（例如包名称、API 级别等）。 .供参考看图片

我想要 - Link

我从下面的编码中得到 - Link

MainActivity.kt

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
 
    recyclerView.adapter = Adapter // I set adapter here with function getApps()
    recyclerView.layoutManager = LinearLayoutManager(this)

private fun getApps(): List<DataClass> {

    // here I get apps icon,name,size and return list<DataClass>
       
  return list
}

Adapter.kt

    class Adapter(private val listOfApps: List<AppData>) :
    RecyclerView.Adapter<Adapter.ViewHolder>() {

    class ViewHolder(appView: View) : RecyclerView.ViewHolder(appView), View.OnClickListener,
        View.OnLongClickListener {

        init {
            appView.setOnClickListener(this)
            appView.setOnLongClickListener(this)
        }

        val icon: ImageView = appView.App_icon
        val name: TextView = appView.App_name
        val size: TextView = appView.App_size

        override fun onClick(v: View?) {
            Toast.makeText(v?.context, "OnClick", Toast.LENGTH_SHORT).show()
        }

        override fun onLongClick(v: View?): Boolean { 
         
           // I want here on Long press BottomSheet appears with details

            val bottomSheetDialog = BottomSheetDialog()
            // Show bottomSheet on LongPress
            bottomSheetDialog.show(
                (v?.context as FragmentActivity).supportFragmentManager, bottomSheetDialog.tag
            )
            return true
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(
            R.layout.list_apps, parent, false
        )
        return ViewHolder(view)
    }

    override fun getItemCount() = listOfApps.size

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

        val currentItem = listOfApps[position]
        holder.icon.setImageDrawable(currentItem.icon)
        holder.name.text = currentItem.name
        holder.size.text = currentItem.size
    }
}

BottomSheetDialog.kt

    class BottomSheetDialog: BottomSheetDialogFragment() {

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.bottom_sheet, container, false)

    }

    override fun getTheme(): Int = R.style.RoundBottomSheetDialog
}

数据类

    data class AppData(
    val icon: Drawable,
    val name: String,
    val size: String,
)

Answer 1

使用您当前的代码，最简单的解决方案是：

1. 修改您的 BottomSheetDialog 以在构造函数中包含 AppData

   class BottomSheetDialog(val appData: AppData): BottomSheetDialogFragment() {

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.bottom_sheet, container, false)
    }
   
    override fun getTheme(): Int = R.style.RoundBottomSheetDialog
   

   }

2. 在 ViewHolder 类中添加 onBind 方法：

    fun onBind(appData: AppData) {
        icon.setImageDrawable(currentItem.icon)
        name.text = currentItem.name
        size.text = currentItem.size
    }
   

3. 修改 Adapter 中的 onBindViewHolder 方法以调用该 onBind 方法：

   override fun onBindViewHolder(holder: ViewHolder, position: Int) { holder.onBind(listOfApps[位置]) }

4. 在您的 ViewHolder 中添加 lateinit var currentItem: AppData，它将在 onBind 中设置，我们可以在 onLongClick 中使用它：

   类 ViewHolder(appView: View) : RecyclerView.ViewHolder(appView), View.OnClickListener, View.OnLongClickListener { . . . 覆盖 fun onLongClick(v: View?): Boolean {

        // I want here on Long press BottomSheet appears with details
        **val bottomSheetDialog = BottomSheetDialog(currentItem)**
        // Show bottomSheet on LongPress
        bottomSheetDialog.show(
            (v?.context as FragmentActivity).supportFragmentManager, bottomSheetDialog.tag
        )
        return true
    }
   
    **private lateinit var currentItem: AppData**
   
    fun onBind(appData: AppData) {
        **currentItem = appData**
        icon.setImageDrawable(currentItem.icon)
        name.text = currentItem.name
        size.text = currentItem.size
    }
   

Answer 2

将您的currentItem 列表项附加到ViewHolder 内部onBindViewHolder 和内部onLongClick 将此数据传递给新创建的BottomSheetDialog，它正在扩展Fragment（因此您可以使用Bundle - @987654328 @ 方法）。然后在onCreateView 中将您的数据设置为Views

Answer 3

1. 创建接口

    interface OnListItemClicked {
   
       fun onClicked(data : AppData)
   
     }
   

2. 在 BottomSheetDialog 中实现该接口

    class BottomSheetDialog: BottomSheetDialogFragment(), OnListItemClicked  {
   
     override fun onCreateView(
       inflater: LayoutInflater,
       container: ViewGroup?,
       savedInstanceState: Bundle?
     ): View? {
       return inflater.inflate(R.layout.bottom_sheet, container, false)
   
    }
   
   override fun onClicked(data: AppData) {
     //show Details here
   }
   
    override fun getTheme(): Int = R.style.RoundBottomSheetDialog
   

   }

3. 从主活动向适配器传递额外的回调。

   Adapter(private val listOfApps: List<AppData>, val onClick: (AppData) -> Unit)

使用listOfAppData[position]从适配器调用点击监听器

4. 在 MainActivity 上将一个函数传递给适配器初始化。

   fun passDataToBottomSheet(data: AppData) {
   
     val listener = OnListItemClicked()
   
     listener.onClicked(data)
   
    }
   

   Adapter(list, ::passDataToBottomSheet)

就是这样。它现在应该可以工作了。