我已经把一些测试数据放到Firestore来测试我的应用程序，我想查询当前登录用户的数据，然后只获取今天保存到数据库中的数据。我的代码现在看起来像这样：package com.example.wht;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import androidx.appcompat.widget.Toolbar;

import androidx.cardview.widget.CardView;

import android.content.Intent;

import android.os.Bundle;

import android.text.format.DateFormat;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.ImageButton;

import android.widget.TextView;

import android.widget.Toast;

import com.example.wht.model.WhtItem;

import com.example.wht.ui.WhtRecyclerAdapter;

import com.example.wht.util.WhtApi;

import com.google.android.gms.tasks.OnFailureListener;

import com.google.android.gms.tasks.OnSuccessListener;

import com.google.firebase.auth.FirebaseAuth;

import com.google.firebase.auth.FirebaseUser;

import com.google.firebase.firestore.CollectionReference;

import com.google.firebase.firestore.FirebaseFirestore;

import com.google.firebase.firestore.Query;

import com.google.firebase.firestore.QueryDocumentSnapshot;

import com.google.firebase.firestore.QuerySnapshot;

import java.sql.Timestamp;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Date;

import java.util.List;

public class MainPageActivity extends AppCompatActivity implements View.OnClickListener {

private TextView highestPulse, lowestPulse;

private TextView highestTemp, lowestTemp;

private TextView time;

private ImageButton tempButton;

private CardView pulseCardView, tempCardView;

private Toolbar toolbar;

private List tempItemList;

private List pulseItemList;

private List itemList;

private String htemp;

private int minTemp ;

private String ltemp;

private int maxPulse;

private String hpulse;

private int minPulse;

private String lpulse;

private int maxTemp;

private String dateAdded;

private FirebaseAuth firebaseAuth;

private FirebaseAuth.AuthStateListener authStateListener;

private FirebaseUser user;

private FirebaseFirestore db = FirebaseFirestore.getInstance();

//Firestore conneection

private CollectionReference collectionReference = db.collection("whtitem");

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main_page);

toolbar = findViewById(R.id.toolbar);

setSupportActionBar(toolbar);

firebaseAuth = FirebaseAuth.getInstance();

user = firebaseAuth.getCurrentUser();

highestPulse = findViewById(R.id.highest_pulse_mainpage);

lowestPulse = findViewById(R.id.lowest_pulse_mainpage);

highestTemp = findViewById(R.id.highest_temperature_text);

lowestTemp = findViewById(R.id.lowest_temp_text);

time = findViewById(R.id.time_mainpage); //TARKISTA

tempButton = findViewById(R.id.imageButton);

pulseCardView = findViewById(R.id.pulse_cardView);

tempCardView = findViewById(R.id.body_heat_cardview);

tempItemList = new ArrayList<>();

pulseItemList = new ArrayList<>();

itemList = new ArrayList<>();

tempButton.setOnClickListener(this);

pulseCardView.setOnClickListener(this);

tempCardView.setOnClickListener(this);

}

@Override

public void onClick(View v) {

switch (v.getId()){

case R.id.imageButton:

//TODO go to temp_history_activity

break;

case R.id.pulse_cardView:

//TODO go to pulse_history_activity

break;

case R.id.body_heat_cardview:

startActivity(new Intent(MainPageActivity.this, TimeTempActivity.class));

break;

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.menu, menu);

return super.onCreateOptionsMenu(menu);

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()){

case R.id.profile:

//add take users to add journal

if (user != null && firebaseAuth!=null){

startActivity(new Intent(MainPageActivity.this, ProfileActivity.class));

//finish();

}

break;

case R.id.temp_history:

/*if (user != null && firebaseAuth!=null) {

startActivity(new Intent(MainPageActivity.this, TempHistoryActivity.class));

//finish();

}

break;*/

case R.id.pulse_history:

/*if (user != null && firebaseAuth!=null) {

startActivity(new Intent(MainPageActivity.this, PulseHistoryActivity.class));

//finish();

}

break;*/

case R.id.time_in_temp_history:

if (user != null && firebaseAuth!=null) {

startActivity(new Intent(MainPageActivity.this, TimeTempActivity.class));

//finish();

}

break;

case R.id.action_signout:

//signout

if (user != null && firebaseAuth!=null){

firebaseAuth.signOut();

startActivity(new Intent(MainPageActivity.this, MainActivity.class));

//finish();

}

break;

}

return super.onOptionsItemSelected(item);

}

@Override

protected void onStart() {

super.onStart();

final Timestamp ts = new Timestamp(System.currentTimeMillis());

final Date cDate = new Date(ts.getTime());

final String currentDate = DateFormat.format("dd/MM/yyyy", cDate).toString();

collectionReference.whereEqualTo("userId", WhtApi.getInstance()

.getUserId())

.whereEqualTo("date", cDate)

.get()

.addOnSuccessListener(new OnSuccessListener() {

@Override

public void onSuccess(QuerySnapshot queryDocumentSnapshots) {

if (!queryDocumentSnapshots.isEmpty()){

for (QueryDocumentSnapshot whtitems : queryDocumentSnapshots) {

WhtItem whtItem = whtitems.toObject(WhtItem.class);

itemList.add(whtItem);

Date dAdded = whtItem.getDate();

dateAdded = DateFormat.format("dd/MM/yyyy", dAdded).toString();

tempItemList.add(whtItem.getTemperature());

pulseItemList.add(whtItem.getPulse());

maxTemp = Collections.max(tempItemList);

htemp ="Korkein:" + maxTemp +" astetta";

minTemp = Collections.min(tempItemList);

ltemp ="Matalin:" + minTemp +" astetta";

maxPulse = Collections.max(pulseItemList);

hpulse ="Korkein:" + maxPulse +" bpm";

minPulse = Collections.min(pulseItemList);

lpulse ="Matalin:" + minPulse +" bpm";

}

if (currentDate.equals(dateAdded)) {

highestTemp.setText(htemp);

lowestTemp.setText(ltemp);

highestPulse.setText(hpulse);

lowestPulse.setText(lpulse);

}else {

Toast.makeText(MainPageActivity.this,"Ei dataa tältä päivältä", Toast.LENGTH_SHORT).show();

}

}else {

Toast.makeText(MainPageActivity.this,"Virhe dataa haettaessa", Toast.LENGTH_SHORT).show();

}

}

})

.addOnFailureListener(new OnFailureListener() {

@Override

public void onFailure(@NonNull Exception e) {

Toast.makeText(MainPageActivity.this,"Ei dataa näytettäväksi", Toast.LENGTH_SHORT).show();

}

});

}

}

这是我的POJO ：package com.example.wht.model;

import com.google.firebase.firestore.ServerTimestamp;

import java.util.Date;

public class WhtItem {

private String nameUser, userId;

private String password;

private int temperature, pulse;

private @ServerTimestamp java.util.Date date;

private int duration;

public WhtItem() {

}

public WhtItem(String nameUser, String userId, String password, int temperature, int pulse, java.util.Date date, int duration) {

this.nameUser = nameUser;

this.userId = userId;

this.password = password;

this.temperature = temperature;

this.pulse = pulse;

this.date = date;

this.duration = duration;

}

public String getNameUser() {

return nameUser;

}

public void setNameUser(String nameUser) {

this.nameUser = nameUser;

}

public String getUserId() {

return userId;

}

public void setUserId(String userId) {

this.userId = userId;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public int getTemperature() {

return temperature;

}

public void setTemperature(int temperature) {

this.temperature = temperature;

}

public int getPulse() {

return pulse;

}

public void setPulse(int pulse) {

this.pulse = pulse;

}

public java.util.Date getDate() {

return date;

}

public void setDate(Date dateAdded) {

this.date = dateAdded;

}

public int getDuration() {

return duration;

}

public void setDuration(int duration) {

this.duration = duration;

}

}

谁能知道我在哪里出错了？