RecyclerView 在滚动时丢失了它的项目位置

Question

I'm currently working on RecyclerView implementation on my project. When I set item on RecyclerView and scroll, I lost its position.

I Use Some if and else condition to click and change the color of text but its change when I'll not scroll the RecyclerView item. Please suggest me the right way how to handle this condition.

adapter.setOnItemClickListner(new LoadVehicleTypeAdapter.setOnitemclick() {
@Override
public void ImageClick(int position, String Name,String Description,int id) {
    LinearLayout linearLayout = null;
    CustomTextView customTextView = null;
    try {
        for (int i = 0; i < messages.size(); i++) {
            linearLayout = (LinearLayout) rvVehicleTypes.getChildAt(i).findViewById(R.id.root1);
            customTextView = (CustomTextView) rvVehicleTypes.getChildAt(i).findViewById(R.id.frag_cartypes_inflated_name);
            if (i==position) {
                linearLayout.setBackgroundColor(Color.parseColor("#999999"));
                customTextView.setTextColor(Color.parseColor("#FFFFFF"));


            } else {
                linearLayout.setBackgroundColor(Color.parseColor("#f3f3f3"));
                customTextView.setTextColor(Color.parseColor("#2196F3"));
            }
        }
        //Toast.makeText(getActivity(),Name, Toast.LENGTH_SHORT).show();
    }
    catch (Exception e)
    {

    }
}

});

Answer 1

Seems you are new to the Android development world, with this assumption let me take you through the journey of ListView to RecyclerView.

ListView, we were used to follow ViewHolder pattern to manage items being recycled when you scroll the listview.

Now RecyclerView have that functionality in-built, not in-built but you have to implement it forcefully, I am talking about onCreateViewHolder and onBindViewHolder .

So now let's take one step ahead in understanding how it works, as soon as you start scrolling down the list, inflated item views start getting recycled, with that your previously inflated ViewHolder (which gets actually created in onCreateViewHolder) is reused.

Now to solve this issue, you have to remember the position and for the same most of us used to use SparseBooleanArray

Answer 2

Please read the documents of RecyclerView . Also I encourage you to read difference between ListView and RecyclerView

Are you using RecyclerView or ListView ? From your code it seems that you are using ListView .

If you want to use RecyclerView please go through the tutorials.

Please go through this tutorial. It will tell you how to use RecyclerView. For click listener follow this tutorial.