如何将用户重定向到Cloud Firestore中的特定活动? [英] How to redirect a user to a specific activity in Cloud Firestore?
本文介绍了如何将用户重定向到Cloud Firestore中的特定活动?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
使用Firebase身份验证注册帐户时，我将电子邮件存储在2个类别的教师和学生中.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.登录时，我想检查电子邮件属于哪个类别(教师或学生)，该怎么办?我尝试了Firestore查询isequalsto，但没有区别.
While Registering an account using Firebase auth I stored emails in 2 categories Teacher and Student. I add emails to Firestore 2 different categories Teacher and Student with email and password. When I login I want to check that email belongs to which category (Teacher or Student) how can I do that I tried the firestore query isequalsto but it didn't differentiate.
这是我的数据库
老师
学生
还有其他可能的解决方法吗?
Any other possible solution?
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();
}
}
});
}
});
}
}
推荐答案
使用两个不同的集合，针对每种类型的用户一个都不是一个灵活的解决方案.另一个更简单的解决方案可能是:
Using two different collections, one for each type of your users isn't quite a flexible solutions. Another more simpler solution might be:
Firestore-root
|
--- users (collection)
|
--- uid (document)
| |
| --- email: "student@email.com"
| |
| --- password: "********"
| |
| --- type: "student"
|
--- uid (document)
|
--- email: "teacher@email.com"
|
--- password: "********"
|
--- type: "teacher"
看，我已经将用户的类型添加为用户对象的属性.现在，要根据电子邮件地址吸引用户，请使用以下代码行:
See, I have added the type of the user as a property of your user object. Now, to get a user based on the email address, please use the following lines of code:
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:
Once the user is authenticated, to redirect the user to the corresponding activity, please use the following lines of code:
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));
}
}
}
}
});
这篇关于如何将用户重定向到Cloud Firestore中的特定活动?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
