使用条件从 `RecyclerView` 适配器中添加和删除项目

问题描述

我正在使用 recyclerview 创建一个活动，添加和删除具有三个条件的项目 即

1. 如果 item/position 是 remove 的第一项，则不会显示 Button，但会显示 add 和 submit 按钮.
2. 如果项目/位置既不是第一个也不是最后一个，则只会显示删除按钮。
3. 如果项目/位置比所有三个按钮都最后一个删除，提交和添加将显示

我正在做的是：从片段添加第一个项目，然后从 adapter 本身添加和删除。

我面临的问题是按钮没有根据条件显示，添加三个项目后项目会随机显示，当删除一个项目并重新添加一个新项目时，会显示旧值。

class Test @Inject constructor(private val taskList: ArrayList<AddTaskArray>,val mContext: Context) : RecyclerView.Adapter<Test.TaskViewHolder>() {
private val TAG = Test::class.java.simpleName

private val mLayoutInflater = LayoutInflater.from(mContext)

override fun getItemCount(): Int {
    AppUtils.logMessage("TaskAdapter","getItemCount(${taskList.size})")
    return taskList.size
}

fun addItems(mTaskList: ArrayList<AddTaskArray>?) {
    AppUtils.logMessage("TaskAdapter","addItems($mTaskList)")
    if (mTaskList != null) {
        clearItems()
        taskList.addAll(mTaskList)
        notifyDataSetChanged()
    }
}

fun addItem(item: AddTaskArray) {
    taskList.add(item)
    notifyItemInserted(taskList.size)
}

fun clearItems() {
    taskList.clear()
    notifyDataSetChanged()
}

override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): TaskViewHolder {
    val view = mLayoutInflater.inflate(R.layout.view_task_item,parent,false)
    return TaskViewHolder(view)
}

override fun onBindViewHolder(holder: TaskViewHolder,position: Int) {
    AppUtils.logMessage("TaskAdapter","onBindViewHolder()")
    var currentTask = taskList[position]
    val layoutPos = holder.layoutPosition
    when {
        layoutPos == 0 -> {
            holder.imageViewAddMoreTask.visibility = View.VISIBLE
            holder.imageViewRemoveLastTask.visibility = View.GONE
            holder.buttonSubmitTask.visibility = View.VISIBLE
        }
        layoutPos > taskList.size - 1 -> {
            holder.imageViewAddMoreTask.visibility = View.GONE
            holder.imageViewRemoveLastTask.visibility = View.VISIBLE
            holder.buttonSubmitTask.visibility = View.GONE
        }
        else -> {
            holder.imageViewAddMoreTask.visibility = View.VISIBLE
            holder.imageViewRemoveLastTask.visibility = View.VISIBLE
            holder.buttonSubmitTask.visibility = View.VISIBLE
        }
    }

    holder.buttonSubmitTask.setonClickListener {
        Log.e(TAG,"data is ${taskList[position]}")
        
        val taskDesc = holder.editTextDescription.text
        if (taskDesc.isNullOrEmpty()) {
            holder.editTextDescription.error = "Please write in task description"
            return@setonClickListener
        }

        val taskRemark = holder.editTextRemark.text
        if (taskRemark.isNullOrEmpty()) {
            holder.editTextRemark.error = "Please write in task remark"
            return@setonClickListener
        }
        val taskPriority = holder.spinnerTaskPriority.selectedItem.toString()
        if (taskPriority == "Priority") {
            return@setonClickListener
        }

        val taskStatus = holder.spinnerTaskStatus.selectedItem.toString()
        if (taskStatus == "Task Status") {
            return@setonClickListener
        }

        val assignedTo = holder.textViewAssignedTo.text
        if (assignedTo == "Assignee") {
            holder.textViewAssignedTo.error = "Set this field"
            return@setonClickListener
        }

        val taskDate = holder.textViewTaskDate.text
        if (taskDate == "Task date") {
            holder.textViewTaskDate.error = "Set task date first"
            return@setonClickListener
        }
        //Todo()
    }

    holder.imageViewAddMoreTask.setonClickListener {
        val taskTitle = holder.editTextTaskTitle.text
        if (taskTitle.isNullOrEmpty()) {
            holder.editTextTaskTitle.error = "Please write in title or record audio"
            return@setonClickListener
        }
        val taskDesc = holder.editTextDescription.text
        if (taskDesc.isNullOrEmpty()) {
            holder.editTextRemark.error = "Please write in task description"
            return@setonClickListener
        }

        val taskRemark = holder.editTextRemark.text
        if (taskRemark.isNullOrEmpty()) {
            holder.editTextRemark.error = "Please write in task description"
            return@setonClickListener
        }
        val taskPriority = holder.spinnerTaskPriority.selectedItem.toString()
        if (taskPriority == "Priority") {
            return@setonClickListener
        }

        val taskStatus = holder.spinnerTaskStatus.selectedItem.toString()
        if (taskStatus == "Task Status") {
            return@setonClickListener
        }

        val assignedTo = holder.textViewAssignedTo.text
        if (assignedTo == "Assignee") {
            holder.textViewAssignedTo.error = "Set this field"
            return@setonClickListener
        }

        val taskDate = holder.textViewTaskDate.text
        if (taskDate == "Task date") {
            holder.textViewTaskDate.error = "Set task date first"
            return@setonClickListener
        }

        taskList.add(position + 1,AddTaskArray("","","00:00",null,""))
        notifyDataSetChanged()
    }

    holder.imageViewRemoveLastTask.setonClickListener {
        taskList.removeAt(position)
        notifyDataSetChanged()
    }
}

// stores and recycles views as they are scrolled off screen
inner class TaskViewHolder internal constructor(itemView: View) : RecyclerView.ViewHolder(itemView) {
    val editTextTaskTitle: EditText = itemView.editTextTaskTitle1
    val imageViewAudioRecord: ImageView = itemView.imageViewRecordButton1
    val imageViewPlayTaskAudio: ImageView = itemView.imageViewPlayLastTaskRecorded1
    val relativeLayoutRecorder: RelativeLayout = itemView.relativeRecorder1
    val recordView: RecordView = itemView.recordView1
    val linearLayoutAudioDetail: LinearLayout = itemView.linearaudioDetail1
    val textViewAudioDuration: TextView = itemView.textViewAudioDuration1
    val textViewAudioPath: TextView = itemView.textViewAudioPath1
    val recordButton: RecordButton = itemView.recordButton1
    val editTextDescription: EditText = itemView.editTextDescription1
    val editTextRemark: EditText = itemView.editTextRemark1
    val linearLayoutForTasktime: LinearLayout = itemView.linearLayoutForTasktime1
    val spinnerTaskPlanHour: Spinner = itemView.spinnerAddTaskPlanHour1
    val spinnerTaskMinutes: Spinner = itemView.spinnerAddTaskPlanMinutes1
    val textViewTaskDate: TextView = itemView.textViewTaskDate1
    val spinnerTaskStatus: Spinner = itemView.spinnerTaskStatus1
    val textViewAssignedTo: TextView = itemView.textViewAssignedTo1
    val spinnerTaskPriority: Spinner = itemView.spinnerPriority1
    val imageViewRemoveLastTask: ImageView = itemView.imageViewRemoveTask1
    val buttonSubmitTask: Button = itemView.btnSubmitTask1
    val imageViewAddMoreTask: ImageView = itemView.imageViewAddNewTask1
    val rootLayout: ConstraintLayout = itemView.rootLayout1
   }

 }

解决方法

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