如何在 android studio 中从 Firebase 获取随机数据

Question

我想使用 java 在 android studio 中显示来自 firebase Recyclerview 的随机数据或引述。如何从 firebase 加载随机数据？

 EntrepreneurRV = (RecyclerView) findViewById(R.id.EntrepreneurRV);
    EntrepreneurRV.setLayoutManager(new LinearLayoutManager(this));
    databaseReference = FirebaseDatabase.getInstance().getReference("Entrepreneur Quotes");
    EntrepreneurRV.setHasFixedSize(true);


    EntrepreneurList = new ArrayList<>();
    EntrepreneurAdapter = new EntrepreneurAdapter(this, EntrepreneurList);
    EntrepreneurRV.setAdapter(EntrepreneurAdapter);

    databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
                EntrepreneurModel EntrepreneurModel = dataSnapshot.getValue(EntrepreneurModel.class);
                EntrepreneurList.add(EntrepreneurModel);
            }

            EntrepreneurAdapter.notifyDataSetChanged();
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });
}

Answer 1

Collections.shuffle 随机化列表并在每次刷新 recyclerview 时显示随机数据。像这样更新您的代码：

 databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
                EntrepreneurModel EntrepreneurModel = dataSnapshot.getValue(EntrepreneurModel.class);
                EntrepreneurList.add(EntrepreneurModel);
                Collections.shuffle(EntrepreneurList); 
            }