Recylerview Not Automatically Loading Data From Firebase Android Studio

I have tried everything but my data from firebase is not getting loaded automatically when I open the app and I have to click a edittext to load the data. I have tried adapter.Up

Solution 1:

The problem is with the retrieve method: it's adding a ChildEventListener that executes asynchronously (meaning it doesn't block until the children data are fetched) and then it immediately returns the spacecrafts list which is still not yet filled by the asynchronous listener code.

You should refresh the RecyclerView adapter in the actual code that fetches data, i.e. in the fetchData method, e.g.:

privatevoidfetchData(DataSnapshot dataSnapshot)
{
    spacecrafts.clear();
    for (DataSnapshot ds : dataSnapshot.getChildren())
    {
        Spacecraft spacecraft=ds.getValue(Spacecraft.class);
        spacecrafts.add(spacecraft);
    }
    adapter.spacecrafts = spacecrafts; // update the list in the adapter
    adapter.notifyDataSetChanged(); // refresh
}

In this case, the retrieve method can have a void return type as it is pointless to return the list from it.

Solution 2:

Use FirebaseRecyclerAdapter for load the data from Firebase.

Solution 3:

modify the helper constructer to be like this:

public FirebaseHelper(Context c, DatabaseReference db, ListView lv) {
    this.c = c;
    this.db = db;
    this.lv = lv;
}

then add this to the fetchData method after the for loop:

if (spacecrafts.size() > 0)
    {
        adapter = newCustomAdapter(c, spacecrafts);
        lv.setAdapter(adapter);
        adapter.notifyDataSetChanged();
    }

then in the main activity modify it like this:

    helper = newFirebaseHelper(this, db, lv);
    //ADAPTER//adapter = new CustomAdapter(this, helper.retrieve());//lv.setAdapter(adapter);
    helper.retrieve();

this should work for you.

Solution 4:

Check if you are setting up adapter in onCreate() method or not, if you are calling it in onStart() then it will not load data automatically. Set Adapter in onCreate() method.