public class c_Fragment_Chat extends Fragment {
private RecyclerView recyclerView;
private UserAdapter userAdapter;
private List<User> mUsers;
EditText s_search_student;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.c_fragment_chat, container, false);
recyclerView = view.findViewById(R.id.c_recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
mUsers = new ArrayList<>();
readUsers();
s_search_student = view.findViewById(R.id.s_search_student);
s_search_student.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
searchUsers(charSequence.toString().toLowerCase());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
return view;
}
private void searchUsers(String s) {
Query query = FirebaseDatabase.getInstance().getReference("User").orderByChild("search")
.startAt(s)
.endAt(s+"\uf8ff");
query.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(s_search_student.getText().toString().equals("")){
mUsers.clear();
for(DataSnapshot snapshot : dataSnapshot.getChildren()){
User user = snapshot.getValue(User.class);
mUsers.add(user);
}
userAdapter = new UserAdapter(getContext(), mUsers, false);
recyclerView.setAdapter(userAdapter);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void readUsers() {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("User");
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
mUsers.clear();
for(DataSnapshot snapshot : dataSnapshot.getChildren()){
User user = snapshot.getValue(User.class);
mUsers.add(user);
}
userAdapter = new UserAdapter(getContext(), mUsers, false);
recyclerView.setAdapter(userAdapter);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero-length
I don't know why my edit text can't able to detect the data changed from the string. Please give me a hand~ thank you very much. And the above is the error problem that I get.
