call method from fragment to fragment ( refresh adapter )

debugcn Published at Dev

boudi

Hello I am trying to call this function loadFiles() which is located in fragmentB and I want to call it from FragmentA, so I can refresh my GridView for my images and videos.

I get this error from the same method

FATAL EXCEPTION: main
    java.lang.NullPointerException

my method in FragmentB:

  public void loadFiles(){
        gridView = (GridView) this.v.findViewById(R.id.grid);
        File f = new File(home);
        if (f.exists()){
            String [] media = f.list();
            ArrayList<String> files = new ArrayList<>();
            for (int i=0; i<media.length;i++){
                if (media[i].endsWith(".jpg")||
                        media[i].endsWith(".png")||
                        media[i].endsWith(".JPEG")||
                        media[i].endsWith(".3gp")||
                        media[i].endsWith(".mp4")||
                        media[i].endsWith(".mov")){
                    files.add(media[i]);
                }

                if (i==media.length-1){
                    GridAdapter adapter = new GridAdapter(this.v.getContext(), files, gridView);
                    adapter.notifyDataSetChanged();
                    gridView.setAdapter(adapter);
                }
            }
        }
    }

How I do call it in FragmentA:

FragmentB b = new FragmentB();
b.loadFiles();

I think the problem is because of this line but I have tried everything and there is no luck :(

GridAdapter adapter = new GridAdapter(this.v.getContext(), files, gridView);

Rustam

I would suggest you to do like this:

 public class Utils{
 public static ArrayList<String> loadFiles(){
         File f = new File(home);
        if (f.exists()){
            String [] media = f.list();
            ArrayList<String> files = new ArrayList<>();
            for (int i=0; i<media.length;i++){
                if (media[i].endsWith(".jpg")||
                        media[i].endsWith(".png")||
                        media[i].endsWith(".JPEG")||
                        media[i].endsWith(".3gp")||
                        media[i].endsWith(".mp4")||
                        media[i].endsWith(".mov")){
                    files.add(media[i]);
                }
            }
            return files;
        }
    }
}

Now in FragmentA and FragmentB etc. you can do

  gridView = (GridView) this.v.findViewById(R.id.grid);
     GridAdapter adapter = new GridAdapter(this.v.getContext(), Utils.loadFiles(), gridView);     
       gridView.setAdapter(adapter);

Collected from the Internet

Please contact [email protected] to delete if infringement.