How to display a drawable according to a condition entered by the user in Android studio(Java)

Issue

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

Solution

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

In Kotlin

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)
}

In Java

public class TaskViewHolder extends RecyclerView.ViewHolder {
        ImageView priorityIndicator;

        public TaskViewHolder(@NonNull View itemView) {
            super(itemView);
            priorityIndicator = itemView.findViewById(R.id.priorityIndicator);
        }


        private void bind(Task task) {
            int drawableId;
            switch (task.priority) {
                case 1: drawableId = R.drawable.indicator_red;
                    break;
                case 2: drawableId = R.drawable.indicator_yellow;
                    break;
                default: drawableId = R.drawable.indicator_green;
            }
            priorityIndicator.setImageDrawable(
                    ContextCompat.getDrawable(priorityIndicator.getContext(), drawableId)
            );
        }
    }

Now call it from onBindViewHolder

@Override
public void onBindViewHolder(@NonNull TaskViewHolder holder, int position) {
    holder.bind(taskList.get(position));
}

Answered By - Praveen