In Android RecyclerView How to change the color of Alternate rows

Question

I am new in android , recently I have learned recyclerview and i want to change the color of rows.

Example: I have 10 rows and I want to change color like 5 rows blue and 5 rows red.Alternate rows color should be like this.

From where I have to change this by Adapter or by MainActivity. Please help me

Answer 1

You can change the color of alternate row by adding the following code on your Adapter class. You can also change the images of your row by using this code.

Put this code inside OnBindViewHolder in Adapter Class.

 if(position %2 == 1)
    {
        holder.itemView.setBackgroundColor(Color.parseColor("#FFFFFF"));
        //  holder.imageView.setBackgroundColor(Color.parseColor("#FFFFFF"));
    }
    else
    {
       holder.itemView.setBackgroundColor(Color.parseColor("#FFFAF8FD"));
       //  holder.imageView.setBackgroundColor(Color.parseColor("#FFFAF8FD"));
    }

Answer 2

In the onBindViewHolder of your adapter simply get the poisition and check that whether it is even or odd. If it is even, set the background color of your layout to red else blue

@Override
public void onBindViewHolder(final ViewHolder viewHolder, int position) {

    if(position%2 == 0){
        viewHolder.containerLayout.setBackgroundColor(R.color.RED);
    } else {
        viewHolder.containerLayout.setBackgroundColor(R.color.BLUE);

    }}

Answer 3

I believe one problem with all of these solutions is that onBindViewHolder doesn't get called in certain cases. If you use notify methods like notifyItemInserted(int position), you could potentially have rows stacked on top of each other with the same color - no good. You will need to call notifyItemChanged on every other item to re-render the background color corresponding to the new position.

Using the re-render all method notifyDataSetChanged() will fix this (but is less efficient than only updating specific rows), and if you don't dynamically change the contents of a RecyclerAdapter while the user is on the screen, you won't have this issue.