Arraylist Become Null

I am getting id from previous activity,if id is null then i parse data and store it in arraylist,but if it is not null then i dont parse data and trying to set arraylist in listvie

Solution 1:

You have not set a LayoutManager to your RecyclerView: use this to set LayoutManager to your RecyclerView:

 mRecyclerView.setLayoutManager(newLinearLayoutManager(this));

in oncreate

Solution 2:

The problem is this part

if(filtrid!=null)
    {
        System.out.println("datacat null"+filterList);
        mAdapter = new CardViewDataAdapter(filterList);
        mRecyclerView.setAdapter(mAdapter);

    }

You read the filtrid but you don't initialize your filterList in this case.

EDIT:

Retrieving the filtridfrom the intent extras is not the same as populating the filterList. You could probably pass the filterList as JSON-String in the same way, you passed the filtrid. Then parse the JSON-String as you did already in makeJsonArrayRequestCountry(). A better way would be, to store the list persistent (SharedPreferences, SQL, ...), or don't store it at all. Just load the list from the server, whenever you start that activity.