Question

好的，我正在制作一个在线捐赠门户android应用程序。该应用程序将有2个主要用户：

捐助者
慈善组织代表

根据用户类型有不同的UI。

下面是注册表格：

下面是登录表单：

然后将表单中的数据添加到数据库中，如下所示（注册后）：

以下是firebase上经过身份验证的用户的数据：

以下是注册课程：

package com.example.android.edonate;

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

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class SignUp extends AppCompatActivity {

    //variables to store data from the form
    private EditText fname;
    private EditText lname;
    private EditText email;
    private EditText cellNo;
    private EditText password;
    private Spinner type;
    private Button signUp;

    //Firebase instance variables
    private FirebaseDatabase mFirebaseDatabase;
    private DatabaseReference mUsersDatabaseReference;
    private FirebaseAuth mAuth;

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

        //Initialize firebase components:
        mFirebaseDatabase = FirebaseDatabase.getInstance();

        //to set to specific location within the database and storage
        mUsersDatabaseReference = mFirebaseDatabase.getReference().child("users");

        //Initialize firebase authentication
        mAuth = FirebaseAuth.getInstance();

        //to get data from the form:
        fname=(EditText)findViewById(R.id.fname);
        lname=(EditText)findViewById(R.id.lname);
        email=(EditText)findViewById(R.id.email);
        cellNo=(EditText)findViewById(R.id.mobile_number);
        password=(EditText)findViewById(R.id.password);
        type=(Spinner)findViewById(R.id.user_category);
        signUp = (Button)findViewById(R.id.button_sign_up_2);

        //Send button sends a message and clears the EditText
        signUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                User user = new User(fname.getText().toString(), lname.getText().toString(), email.getText().toString(), cellNo.getText().toString(), password.getText().toString(), type.getSelectedItem().toString());
                mUsersDatabaseReference.push().setValue(user);  //add user details to the database
                RegisterUser();

                //return to home page after signing up:
                //Intent intent = new Intent(SignUp.this,MainActivity.class);
                //startActivity(intent);
            }
        });
    }

    //to register user to the Firebase 'users'
    public void RegisterUser(){
        String Email = email.getText().toString().trim();
        String Password = password.getText().toString().trim();
        if (TextUtils.isEmpty(Email)){
            Toast.makeText(this, "Email field is Empty!", Toast.LENGTH_SHORT).show();
            return;
        }
        if (TextUtils.isEmpty(Password)){
            Toast.makeText(this, "Password field is Empty!", Toast.LENGTH_SHORT).show();
            return;
        }
        mAuth.createUserWithEmailAndPassword(Email, Password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        try {
                            //check if successful
                            if (task.isSuccessful()) {
                                //User is successfully registered and logged in
                                //start Profile Activity here
                                finish();
                                startActivity(new Intent(getApplicationContext(), MainActivity.class));
                            }else{
                                Toast.makeText(SignUp.this, "Couldn't register, try again",
                                        Toast.LENGTH_SHORT).show();
                            }
                        }catch (Exception e){
                            e.printStackTrace();
                        }
                    }
                });
    }

}

根据登录用户的“类型”（如数据库中所示）是捐赠者还是慈善机构，我想做的是打开一个不同的活动。因此，在“登录”类中需要执行以下步骤： 1.验证用户电子邮件和密码（我已经执行过） 2.从具有该特定电子邮件的数据库中获取用户记录。 3.检查所选用户记录的“类型”字段是“慈善”还是“捐赠者” 4.根据类型字段的值打开相关活动

第1步和第4步将很容易实现。我需要帮助的第2步和第3步。步骤2和3将在SigIn.java类中实现。现在，我默认情况下会打开DonorHome.java cals，但是我需要添加一个条件来打开Donor.Home和CHarity.Home

下面是SignIn.java类的代码。我需要在这里添加什么相关代码？

package com.example.android.edonate;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.content.Intent;
import android.view.View;
import android.util.Log;
import android.net.Uri;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.firebase.ui.auth.AuthUI;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseError;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;

import java.util.Arrays;
import java.util.List;

public class SignIn extends AppCompatActivity {
    private EditText email;
    private EditText password;
    private FirebaseAuth mAuth;
    private FirebaseUser currentUser;
    private FirebaseDatabase mFirebaseDatabase;
    private DatabaseReference mUsersDatabaseReference;
    private Button signIn;

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

        email = (EditText)findViewById(R.id.input_email);
        password = (EditText)findViewById(R.id.input_password);
        mAuth = FirebaseAuth.getInstance();
        currentUser = mAuth.getCurrentUser();
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mUsersDatabaseReference = mFirebaseDatabase.getReference();
        //.child("users");
        signIn = (Button)findViewById(R.id.button_sign_in_2);

        signIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (v == signIn){
                    LoginUser();
                }
            }
        });

    }

    public void LoginUser(){
        final String Email = email.getText().toString().trim();
        String Password = password.getText().toString().trim();
        mAuth.signInWithEmailAndPassword(Email, Password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()){
                            currentUser = mAuth.getCurrentUser();
                            finish();
                            startActivity(new Intent(getApplicationContext(),
                                    DonorHome.class));
                        }else {
                            Toast.makeText(SignIn.this, "couldn't login",
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }

}

Answer 1

首先告诉您，StackOverflow并非源于解决方案代码请求，而是源于问题或疑问，因此要求很多代码行并不那么合适。

无论如何，您需要执行以下操作：

public void LoginUser(){
    final String Email = email.getText().toString().trim();
    String Password = password.getText().toString().trim();
    mAuth.signInWithEmailAndPassword(Email, Password)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if (task.isSuccessful()){
                        currentUser = mAuth.getCurrentUser();
                        getUserInformation();
                        //finish(); Don't finish activity now
                        //startActivity(new Intent(getApplicationContext(),
                            //  DonorHome.class)); Don't start activity without know user type
                    }else {
                        Toast.makeText(SignIn.this, "couldn't login",
                                Toast.LENGTH_SHORT).show();
                    }
                }
            });
}
private void getUserInformation(){
//here get User information by firebase querying and get result.....
...onSuccess(){
    if(userType.equals("Donor")
        startDonorActivityMain();
    else
        startCharityActivityMain();
    }
}

根据从Firebase检索的数据进行决策-Android

1 个答案: