I have a list of items displayed in Recycler view and they are sorted according to their priority (1,2,3) entered by the user with 1 on top and 3 at the bottom. I want the items to be accompanied by a drawable in red(for priority 1), yellow(for priority 2) and green(for priority 3) depending on the input from the user. May I please know how to display the drawable in such a case. picture 1

Picture 2

CodePudding user response：

So the color of the layout is always the same right? Red for 1st index, yellow for 2nd, and green for 3rd?

On your RecyclerView adapter you can pass a position parameter at onBindViewHolder and add condition based on the position. For example:

override fun onBindViewHolder(holder: listHolder, position: Int) {
    holder.bind(listItem[position], position)
}

class ListHolder(itemView: View): RecyclerView.ViewHolder(itemView) {
    fun bind(item: YourItem, position) {
        when(position){
            0 -> binding.imageView.setImageResource(R.drawable.redDrawable)
            1 -> binding.imageView.setImageResource(R.drawable.yellowDrawable)
            2 -> binding.imageView.setImageResource(R.drawable.greenDrawable)
        }
    }
 }

CodePudding user response：

You can do this in onBindViewHolder method of the adapter or create a bind method in your view holder and then call it from onBindViewHolder

For the latter, in your view holder create bind method

class TaskViewHolder(private val taskItemBinding: TaskItemBinding) :
            RecyclerView.ViewHolder(taskItemBinding.root) {
            fun bind(task: Task) {
                taskItemBinding.apply {
                    priorityIndicator.setImageDrawable(
                        ContextCompat.getDrawable(
                            priorityIndicator.context,
                            when (task.priority) {
                                1 -> R.drawable.indicator_red
                                2 -> R.drawable.indicator_yellow
                                3 -> R.drawable.indicator_green
                            }
                        )
                    )
                }
            }
        }

Now, call it from onBindViewHolder

override fun onBindViewHolder(holder: TaskViewHolder, position: Int) {
    val task = getItem(position)
    holder.bind(task)
}