[英]how to get Random data from Firebase in android studio
我想使用java在android studio中显示来自firebase Recyclerview的随机数据或报价。 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) {
}
});
}
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);
}
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