How to call getFragmentManager on Recycler.Adapter?

Question

I am converting ListView of my app to RecyclerView. On ListView, it was very easy to implement OnClickListener but in RecyclerView, we have to do it in adapter. I want to op

Answer 1

Make sure to pass context to the ArrayAdapter or RecyclerViewAdpater,So that we can get it inside Adapter Class.

If your mainActivity is extending Activity then use :

 FragmentManager fragmentManager = ((Activity)context).getFragmentManager();

If your mainActivity is extending AppCompatActivity then use :

FragmentManager fragmentManager = ((AppCompatActivity)context).getSupportFragmentManager();

Answer 2

Best option would probably be to have the Fragment that instantiates the RecyclerAdapter to implement and interface like this:

public class MyRecyclerAdapter extends Adapter<RecyclerAdapter.ViewHolder> {

     private ItemType[] mItems;
     private MRAItemClickedListener mListener;

     public MyRecyclerAdapter(Context ctx, MRAItemClickedListener listener){

        mListener = listener;
        ...
     }

     @Override
     public void onBindViewHolder(ViewHolder holder, int position) {
         holder.itemView.setOnClickListener(new OnClickListener(){
             @Override
             public void onClick(View v) {
                  mListener.onItemClicked(mItems[position]);
             }
         });
     }

     interface MRAItemClickedListener {
         void onItemClicked(ItemType item);
     }

}

public class MyFragment ... implements MRAItemClickedListener {

    public void onItemClicked(ItemType item){
          // do stuff with item
    }

}

Answer 3

You just need an activity context passed in your constructor. Be sure to call new Adapter(this,...) from activities and new Adapter(getActivity(),...) from fragments.

private Context context; @Override public void onClick(View v) { FragmentManager manager = ((Activity) context).getFragmentManager();}

Answer 4

Instantiate the fragmentManager in the activity itself.

MyActivity.java

 FragmentManager fragmentManager = getFragmentManager();
 adapter = new CustomAdapter(productsList, fragmentManager);

---

CustomAdapter.java

 CustomAdapter implements MyClickListner{
 CustomAdapter(Arraylist<MyProduct>productsList, FragmentManager fragmentManager) {
      this.productList = productsList;
      this.fragmentManager = fragmentManager;
 }

 @override
  clickFunction(){
     Fragment myFragment= new MyFilterFragment();
     ((MyFilterFragment) myFragment).show(this.fragmentManager,"tag");
  }

---

MyClickListener.java

public interface MyClickListener(){
   public clickFunction();
}

Answer 5

To add on to the approved answer: if you still get an error you might need to replace this line;

FragmentManager manager = ((Activity)context).getFragmentManager();

With this

FragmentManager manager = ((AppCompatActivity)context).getSupportFragmentManager();

For me this was because I was using the support.v4.app.FragmentManager instead of the regular fragmentmanager

Still get an error?

As one comment below pointed out, this might throw a java.lang.ClassCastException: and log ... cannot be cast to android.support.v7.app.AppCompatActivity (check comments for details)

Their fix was to use this instead (I haven't tested it but it worked for them):

((AppCompatActivity)activity).getSupportFragmentManager()

Answer 6

You could pass FragmentManager reference while creating viewholder so your class for Viewholder could be as follows

class ListItemViewHolder {
FragmentManager manager;
public ListItemViewHolder(View itemView,FragmentManager manager) {
        super(itemView);
        title = (TextView) itemView.findViewById(R.id.title);
        description = (TextView) itemView.findViewById(R.id.description);
        itemView.setOnClickListener(this);
        this.manager = manager;
    }

    @Override
    public void onClick(View v) {
        //Call FragmentManager and add Fragment to it.
        manager.beginTransaction...
        }
    }