我正在从 firebase Realtime Db 获取数据，并在 recyclerview 问题上获取数据是 Collection.shuffling 在 android studio 中重复相同的项目

Question

Here is my Code. Also, I am using auto-clicking on index 0, How do I Stop Repeating items when shuffling?

    if (ref != null) {
        ref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                if (dataSnapshot.exists()) {
                    list = new ArrayList<>();
                    String state;
                    String UserEmail;
                    for (DataSnapshot ds : dataSnapshot.getChildren()) {
                        Deal value = ds.getValue(Deal.class);
                        value.setKey(ds.getKey());
                        state = "" + ds.child("VideoStatus").getValue();
                        if (state.equals("incomplete"))
                            list.add(value);
                        Collections.shuffle(list);

                    }
                    AdapterClassssautoclicker adapterClassssautoclicker = new AdapterClassssautoclicker(list);
                    recyclerView.setAdapter(adapterClassssautoclicker);

// recyclerView.swapAdapter(adapterClassssautoclicker);

                }


                int pos = 0;
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        if (recyclerView.findViewHolderForAdapterPosition(pos) != null)
                            Objects.requireNonNull(recyclerView.findViewHolderForAdapterPosition(pos)).itemView.performClick();
                    }
                }, 1);

            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Toast.makeText(getApplicationContext(), databaseError.getMessage(), Toast.LENGTH_SHORT).show();

            }
        });

    }


}

Answer 1

According to your last comment:

Code is repeating Items I want to remove repetition while shuffling

To solve this issue, you have to get the following line of code:

Collections.shuffle(list);

Out of the for loop as you see in the following line of code:

for (DataSnapshot ds : dataSnapshot.getChildren()) {
    Deal value = ds.getValue(Deal.class);
    value.setKey(ds.getKey());
    state = "" + ds.child("VideoStatus").getValue();
    if (state.equals("incomplete"))
        list.add(value);
}
Collections.shuffle(list);

In this way, you are shuffling the elements only once, and not at every iteration. In this way you can avoid duplicate elements.