如何将用户重定向到 Cloud Firestore 中的特定活动？

Question

在使用 Firebase 身份验证注册帐户时，我将电子邮件存储在教师和学生两个类别中。我使用email 和password 将电子邮件添加到Firestore 2 个不同类别的教师和学生。当我登录时，我想检查电子邮件属于哪个类别（教师或学生）我该怎么做我尝试了 firestore 查询 isequalsto 但它没有区分。

这是我的数据库

老师

学生

还有其他可能的解决方案吗？

这是我的登录活动代码

package com.example.dell.step;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.firestore.CollectionReference;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QuerySnapshot;

public class LoginActivity extends AppCompatActivity {


    private Button mRegbtn;
    private Button mloginbtn;
    private EditText mEmail;
    private EditText mPassword;

    private Toolbar mToolbar;

    private FirebaseAuth mAuth;

    private ProgressDialog mLoginDialog;
    private FirebaseFirestore firebaseFirestore;
    private CollectionReference collectionReference_I;
    private CollectionReference collectionReference_S;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);


        mAuth = FirebaseAuth.getInstance();

        //Progress Dialog

        mLoginDialog = new ProgressDialog(this);

        //FOr Toolbar

        mToolbar = findViewById(R.id.login_toolbar);
        setSupportActionBar(mToolbar);
        getSupportActionBar().setTitle("Login Account");


        mloginbtn = findViewById(R.id.login_btn);
        mEmail = findViewById(R.id.login_email);
        mPassword = findViewById(R.id.login_password);

        mRegbtn = findViewById(R.id.login_reg_btn);

        firebaseFirestore = FirebaseFirestore.getInstance();

        mRegbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent regIntent = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivity(regIntent);
                finish();

            }
        });


        mloginbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String email = mEmail.getText().toString();
                String password = mPassword.getText().toString();

                if (!TextUtils.isEmpty(email) && !TextUtils.isEmpty(password)) {
                    mLoginDialog.setTitle("Login User");
                    mLoginDialog.setMessage("Please wait while we login to your account :)");
                    //it stops cancel Dialog when user touch on screen
                    mLoginDialog.setCanceledOnTouchOutside(false);
                    mLoginDialog.show();

                    login_user(email, password);
                }
            }
        });


    }

    private void login_user(final String email, final String password) {

        collectionReference_I = firebaseFirestore.collection("Teacher");
        collectionReference_S = firebaseFirestore.collection("Student");

        collectionReference_I.whereEqualTo("teacher_email", email).get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
            @Override
            public void onSuccess(QuerySnapshot documentSnapshots) {

                mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {


                        if (task.isSuccessful()) {

                            //Dismiss the progress Dialog
                            mLoginDialog.dismiss();


                            //user is registered
                            Toast.makeText(LoginActivity.this, "Welcome to Teacher Account", Toast.LENGTH_SHORT).show();
                            Intent mainIntent = new Intent(LoginActivity.this, MainActivity.class);
                            startActivity(mainIntent);
                            finish();


                        } else {

                            mLoginDialog.hide();

                            //if user is not registered
                            Toast.makeText(LoginActivity.this, "Cannot Log in Please check the form and try again!", Toast.LENGTH_LONG).show();

                        }

                    }
                });


            }
        });

        collectionReference_S.whereEqualTo("Student_email", email).get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
            @Override
            public void onSuccess(QuerySnapshot documentSnapshots) {

                mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {


                        if (task.isSuccessful()) {

                            //Dismiss the progress Dialog
                            mLoginDialog.dismiss();


                            //user is registered
                            Toast.makeText(LoginActivity.this, "Welcome to Student Account", Toast.LENGTH_SHORT).show();
                            Intent mainIntent = new Intent(LoginActivity.this, StudentMain.class);
                            startActivity(mainIntent);
                            finish();


                        } else {

                            mLoginDialog.hide();

                            //if user is not registered
                            Toast.makeText(LoginActivity.this, "Cannot Log in Please check the form and try again!", Toast.LENGTH_LONG).show();

                        }

                    }
                });


            }
        });


    }
}

Answer 1

使用两个不同的集合，为您的每种类型的用户使用一个集合并不是一个非常灵活的解决方案。另一个更简单的解决方案可能是：

Firestore-root
   |
   --- users (collection)
        |
        --- uid (document)
        |    |
        |    --- email: "student@email.com"
        |    |
        |    --- password: "********"
        |    |
        |    --- type: "student"
        |
        --- uid (document)
             |
             --- email: "teacher@email.com"
             |
             --- password: "********"
             |
             --- type: "teacher"

看，我已将用户类型添加为您的用户对象的属性。现在，要根据电子邮件地址获取用户，请使用以下代码行：

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference usersRef = rootRef.collection("users");
Query query = usersRef.whereEqualTo("email", "student@email.com")
query.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
    @Override
    public void onComplete(@NonNull Task<QuerySnapshot> task) {
        if (task.isSuccessful()) {
            for (QueryDocumentSnapshot document : task.getResult()) {
                String email = document.getString("email");
                String password = document.getString("password");
                mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(/* ... */);
            }
        }
    }
});

用户通过身份验证后，要将用户重定向到相应的活动，请使用以下代码行：

String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
usersRef.document(uid).get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
    @Override
    public void onComplete(@NonNull Task<DocumentSnapshot> task) {
        if (task.isSuccessful()) {
            DocumentSnapshot document = task.getResult();
            if (document.exists()) {
                String type = document.getString("type");
                if(type.equals("student")) {
                    startActivity(new Intent(MainActivity.this, Student.class));
                } else if (type.equals("teacher")) {
                    startActivity(new Intent(MainActivity.this, Teacher.class));
                }
            }
        }
    }
});

Answer 2

package com.example.myapplicationomostff

import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.annotation.NonNull
import androidx.appcompat.app.AppCompatActivity
import com.google.android.gms.tasks.OnCompleteListener
import com.google.android.gms.tasks.Task
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.firestore.DocumentSnapshot
import com.google.firebase.firestore.FirebaseFirestore
import com.google.firebase.firestore.QueryDocumentSnapshot
import com.google.firebase.firestore.QuerySnapshot
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.activity_registy.*


class MainActivity : AppCompatActivity() {

    var myauth =FirebaseAuth.getInstance()
    var rootRef = FirebaseFirestore.getInstance()
    var usersRef = rootRef.collection("users")






    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        btnlogin.setOnClickListener {
            var email =txtemaillogin.text.toString().trim()
            var password =txtpasslogin.text.toString().trim()
            userlogin(email,password)


            }



        btnregistry.setOnClickListener{


            var intent = Intent(this, chose::class.java)
            startActivity(intent)

        }




        }

    private fun userlogin(email: String, password: String) {
        var query = usersRef.whereEqualTo("email",email)
        query.get().addOnCompleteListener { task ->
            if (task.isSuccessful) {
                for (document in task.getResult()!!) {
                    var email1 = document.getString("email").toString()
                    var password1 = document.getString("password").toString()
                    if(password1 == password
                        && email1 == email
                    ){
                        myauth.signInWithEmailAndPassword(email1, password1).addOnCompleteListener{
                            if(it.isSuccessful){

                                val uid = FirebaseAuth.getInstance().currentUser?.uid
                                if (uid != null) {
                                    usersRef.document(uid).get().addOnCompleteListener { task ->
                                        if (task.isSuccessful) {
                                            val document = task.result
                                            if (document != null) {
                                                if (document.exists()) {
                                                    val type = document.getString("type")
                                                    if (type == "doc") {
                                                        startActivity(Intent(this@MainActivity,docpage::class.java))
                                                    } else if (type == "eng") {
                                                        startActivity(Intent(this@MainActivity, engpage::class.java))
                                                    }else  if (type=="mos"){
                                                        startActivity(Intent(this@MainActivity, chosepage::class.java))


                                                    }
                                                }
                                            }
                                        }
                                    }
                                }



                                Toast.makeText(this,"ok",Toast.LENGTH_LONG).show()
                            }else{
                                Toast.makeText(this,"erorr",Toast.LENGTH_LONG).show()

                            }
                        }
                    }else{
                        Toast.makeText(this,"مش مسجل ف الموقع ",Toast.LENGTH_LONG).show()


}