我正在将Cloud Firestore用作数据库，以将所有用户另存为“用户”集合中的文档。我想将“用户”集合中的所有用户显示到我的RecyclerView中，但当前正在使用该应用程序的当前用户除外。我进行了大量搜索以找到整个Internet上的解决方案，但找不到任何解决方案。因此，请帮助我，谢谢。我是一个初学者，所以真的需要您的帮助。再次感谢。
这是我的Firestore适配器：
mQuery = FirebaseFirestore.getInstance().collection("users");
FirestoreRecyclerOptions<NearbyUserRecyclerModel> options = new FirestoreRecyclerOptions.Builder<NearbyUserRecyclerModel>()
.setQuery(mQuery,NearbyUserRecyclerModel.class)
.setLifecycleOwner(getActivity())
.build();
FirestoreRecyclerAdapter adapter = new FirestoreRecyclerAdapter<NearbyUserRecyclerModel,NearbyProfilesViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull final NearbyProfilesViewHolder holder, int position, @NonNull final NearbyUserRecyclerModel model) {
holder.itemBuddyState.setText("0");
Glide.with(getActivity()).load(model.getThumb_pictures()).into(holder.itemImage);
holder.itemDisplayName.setText(model.getFirst_name());
holder.itemOnline.setVisibility(View.VISIBLE);
DocumentSnapshot snapshot = getSnapshots().getSnapshot(position);
if (snapshot.contains("online")){
Boolean onlineState = snapshot.getBoolean("online");
if (onlineState == true){
holder.itemOnline.setVisibility(View.VISIBLE);
}
else {
holder.itemOnline.setVisibility(View.INVISIBLE);
}
}
final String user_id = snapshot.getId();
mChatRequestCollection.document(current_user_id).collection("request_received")
.document(user_id).get().addOnCompleteListener(getActivity(),
new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if (task.isSuccessful()){
DocumentSnapshot document = task.getResult();
if (document.contains("received_time")){
holder.itemBuddyState.setText("3");
}else {
Log.d("REQUEST RECEIVED", "onComplete: received field doest exist, "+task.getException());
}
}else {
Log.d("REQUEST RECEIVED", "onComplete: Document doesn't exist, "+ task.getException());
}
}
});
mChatRequestCollection.document(current_user_id).collection("request_sent")
.document(user_id).get().addOnCompleteListener(getActivity(),
new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if (task.isSuccessful()){
DocumentSnapshot document = task.getResult();
if (document.contains("sent_time")){
holder.itemBuddyState.setText("2");
}else {
Log.d("REQUEST SENT", "onComplete: sent field doesn't exist, "+ task.getException());
}
}else {
Log.d("REQUEST SENT", "onComplete: Document doesn't exist,");
}
}
});
mChatHolderCollection.document(current_user_id+"/user_chats/"+user_id)
.get().addOnCompleteListener(getActivity(),
new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if (task.isSuccessful()){
DocumentSnapshot document = task.getResult();
if (document.contains("timestamp")){
holder.itemBuddyState.setText("1");
}else {
Log.d("CHAT_HOLDERDOC", "onComplete: timeStamp field doesn't exist, "+task.getException());
}
}else {
Log.d("CHAT_HOLDERDOC", "onComplete: chat buddy doesn't exist, "+task.getException());
}
}
});
holder.itemImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
userPopupDialog(model, user_id);
// popupIntent(user_id);
}
});
holder.itemButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
String message = holder.itemEditText.getText().toString();
if (holder.itemBuddyState.getText().equals("0")){
if (!TextUtils.isEmpty(message)) {
WriteBatch request_batch = mRootStore.batch();
Map<String, Object> sentMap = new HashMap<>();
sentMap.put("sent_time", FieldValue.serverTimestamp());
sentMap.put("message", message);
Map<String, Object> receivedMap = new HashMap<>();
receivedMap.put("received_time", FieldValue.serverTimestamp());
receivedMap.put("message", message);
Map<String, Object> notificationMap = new HashMap<>();
notificationMap.put("from", current_user_id);
notificationMap.put("type", "request");
DocumentReference sentRef = mRootStore.collection("chat_requests").document(current_user_id + "/request_sent/" + user_id);
request_batch.set(sentRef, sentMap, SetOptions.merge());
DocumentReference receivedRef = mRootStore.collection("chat_requests").document(user_id + "/request_received/" + current_user_id);
request_batch.set(receivedRef, receivedMap, SetOptions.merge());
DocumentReference notificationRef = mRootStore.collection("users/" + user_id + "/notifications").document();
request_batch.set(notificationRef, notificationMap, SetOptions.merge());
request_batch.commit().addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()) {
//------------Request Sent------------//
holder.itemEditText.setText("");
holder.itemBuddyState.setText("2");
Log.d("REQUEST_LOG", "onComplete: Request sent Successfully");
Log.d("REQUEST_LOG", "onComplete: Notification sent Successfully");
Snackbar.make(v, "Request sent Successfully", Snackbar.LENGTH_LONG).show();
} else {
Snackbar.make(v, "Failed Sending Request", Snackbar.LENGTH_LONG).show();
Log.d("REQUEST_LOG", "onComplete: Failed sending request" + task.getException());
}
}
});
}
}
if (holder.itemBuddyState.getText().equals("3")){
holder.itemEditText.setText("");
Snackbar.make(v, "Request already received by user", Snackbar.LENGTH_LONG).show();
}
if (holder.itemBuddyState.getText().equals("2")){
holder.itemEditText.setText("");
Snackbar.make(v, "Request already sent", Snackbar.LENGTH_LONG).show();
}
if (holder.itemBuddyState.getText().equals("1")){
holder.itemEditText.setText("");
Snackbar.make(v,"User already chat buddy", Snackbar.LENGTH_LONG).show();
}
}
});
}
@NonNull
@Override
public NearbyProfilesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.nearby_profiles_recycler_items, parent, false);
final AppCompatImageButton button_send = view.findViewById(R.id.itemSendButton_id);
final AppCompatEditText editText_message = view.findViewById(R.id.itemEditText_id);
Drawable drawable = getResources().getDrawable(R.drawable.ic_send_new);
drawable = DrawableCompat.wrap(drawable);
DrawableCompat.setTint(drawable, getResources().getColor(R.color.colorTabUnselected));
button_send.setImageDrawable(drawable);
button_send.setEnabled(false);
editText_message.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String message = editText_message.getText().toString();
if (TextUtils.isEmpty(message)){
Drawable drawable = getResources().getDrawable(R.drawable.ic_send_new);
drawable = DrawableCompat.wrap(drawable);
DrawableCompat.setTint(drawable, getResources().getColor(R.color.colorTabUnselected));
button_send.setImageDrawable(drawable);
button_send.setEnabled(false);
}
else {
Drawable drawable = getResources().getDrawable(R.drawable.ic_send_new);
drawable = DrawableCompat.wrap(drawable);
DrawableCompat.setTint(drawable, getResources().getColor(R.color.colorTabSelected));
button_send.setImageDrawable(drawable);
button_send.setEnabled(true);
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
return new NearbyProfilesViewHolder(view);
}
};
nearbyRecycler.setAdapter(adapter);
答案 0 :(得分：2)
通过以下方法更改IF条件
public void getUserData(){
db.collection("users")
.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
Log.d(TAG, document.getId() + " => " + document.getData());
if(document.getData().get("userID").equals(userID)){
// User user = (User)document.getData();
// Log.e(TAG, "onComplete: "+user.getUserName()+ user.getDescription() + user.isGender());
Map<String, Object> user = new HashMap<>();
user.put("name", document.getData().get("name"));
user.put("userID", document.getData().get("userID"));
user.put("email", document.getData().get("email"));
user.put("companyName",document.getData().get("companyName"));
user.put("officeAddress", document.getData().get("officeAddress"));
user.put("phoneNumber", document.getData().get("phoneNumber"));
user.put("gender",document.getData().get("gender"));
user.put("isProfileComplete",document.getData().get("isProfileComplete"));
user.put("profilePicUrl", document.getData().get("profilePicUrl"));
user.put("description", document.getData().get("description"));
/* if(document.getData().get("isProfileComplete")){
LoginActivity loginActivity = (LoginActivity)mContext;
loginActivity.navigateToHome();
}else{
LoginActivity loginActivity = (LoginActivity)mContext;
loginActivity.navigateToHome();
}*/
boolean check = (Boolean) document.getData().get("isProfileComplete");
if(check){
LoginActivity loginActivity = (LoginActivity)mContext;
loginActivity.navigateToHome();
}else{
LoginActivity loginActivity = (LoginActivity)mContext;
loginActivity.navigateToOnBoarding();
}
Log.e(TAG, "onComplete:GET DADA "+ user.get("isProfileComplete"));
}else{
Log.e(TAG, "onComplete:ID "+document.getData().get("userID") );
LoginActivity loginActivity = (LoginActivity)mContext;
loginActivity.navigateToOnBoarding();
}
}
} else {
Log.w(TAG, "Error getting documents.", task.getException());
}
}
});
}
答案 1 :(得分：1)
无法使用DECLARE @T TABLE (ROW_NUM INT, AMOUNT MONEY,N_AMOUNT MONEY, NEEDED_RESULT MONEY)
INSERT INTO @T
SELECT * FROM (VALUES
(1, 100.00, NULL ,100),
(2, 300.00, NULL ,200),
(3, 300.00, -400.00 ,0 )
) a(ROW_NUM , AMOUNT ,N_AMOUNT , NEEDED_RESULT )
;WITH x AS
(
SELECT
*,
[R] = SUM(Amount) OVER (ORDER BY ROW_NUM DESC) + SUM(N_Amount) OVER ()
FROM @T
)
SELECT ROW_NUM,AMOUNT,N_AMOUNT, NEEDED_RESULT,
CASE
WHEN R < 0 THEN 0
WHEN R > Amount THEN Amount
ELSE R
END
FROM x
ORDER BY ROW_NUM
（不等于运算符）查询Firestore数据库。因此，以下代码行不存在：
查询查询= db.collection（“用户”）。其中不 EqualTo（“ userID”，userID）;
在这种情况下，您需要为此创建自己的逻辑。要解决此问题，您需要在数据库中查询所有用户，但适配器应接收除当前用户之一以外的所有用户。因此，您需要创建一个if语句来检查当前用户是否不同于其他用户。