java - 带有 Firebase 的 Android 应用 [数据库问题]

Question

几天前，我开始在“Android Studio”中编写应用程序。

我最近发现了我想用作数据库的 Firebase。我现在的问题是，无论我如何编写代码，都不会将任何内容写入“实时数据库”。有时我的应用程序完全崩溃，有时会无限循环加载。

如果有人可以帮助写入我的数据库结构应该如下：

用户： --
UID：
----年龄：
----电子邮件：
----全名：

这是我的代码，也许有人可以找到我的错误。

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Patterns;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
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.FirebaseDatabase;

public class RegisterUser extends AppCompatActivity implements View.OnClickListener {

    private TextView banner, registerUser;
    private EditText editTextFullName, editTextAge, editTextEmail, editTextPassword;
    private ProgressBar progressBar;

    private FirebaseAuth databaseAuth;

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

        databaseAuth = FirebaseAuth.getInstance();

        banner = (TextView) findViewById(R.id.banner);
        banner.setOnClickListener(this);

        registerUser = (Button) findViewById(R.id.registerUser);
        registerUser.setOnClickListener(this);

        editTextFullName = (EditText) findViewById(R.id.fullName);
        editTextAge = (EditText) findViewById(R.id.age);
        editTextEmail = (EditText) findViewById(R.id.email);
        editTextPassword = (EditText) findViewById(R.id.password);

        progressBar = (ProgressBar) findViewById(R.id.progressBar);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.banner:
                startActivity(new Intent(this, MainActivity.class));
                break;
            case R.id.registerUser:
                registerUser();
                break;
        }
    }

    private void registerUser() {
        String email = editTextEmail.getText().toString().trim();
        String password = editTextPassword.getText().toString().trim();
        String fullName = editTextFullName.getText().toString().trim();
        String age = editTextAge.getText().toString().trim();

        if (fullName.isEmpty()){
            editTextFullName.setError("Bitte ausfüllen.");
            editTextFullName.requestFocus();
            return;
        }

        if (age.isEmpty()){
            editTextAge.setError("Bitte ausfüllen.");
            editTextAge.requestFocus();
            return;
        }

        if (email.isEmpty()){
            editTextEmail.setError("Bitte ausfüllen.");
            editTextEmail.requestFocus();
            return;
        }

        if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()){
            editTextEmail.setError("Bitte eine gültige Email-Adresse angeben.");
            editTextEmail.requestFocus();
            return;
        }

        if(password.isEmpty()){
            editTextPassword.setError("Bitte ausfüllen.");
            editTextPassword.requestFocus();
            return;
        }

        if (password.length() < 6){
            editTextPassword.setError("Password muss mindestens aus 6 Zeichen bestehen.");
            editTextPassword.requestFocus();
            return;
        }


        progressBar.setVisibility(View.VISIBLE);
        databaseAuth.createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()){
                            User user = new User(fullName, age, email);

                            FirebaseDatabase.getInstance().getReference("Users")
                                    .child(FirebaseAuth.getInstance().getCurrentUser().getUid())
                                    .setValue(user).addOnCompleteListener(new OnCompleteListener<Void>() {
                                @Override
                                public void onComplete(@NonNull Task<Void> task) {

                                    if(task.isSuccessful()){
                                        Toast.makeText(RegisterUser.this, "Registrierung erfolgreich!", Toast.LENGTH_SHORT).show();
                                        progressBar.setVisibility(View.GONE);
                                    } else {
                                        Toast.makeText(RegisterUser.this, "Ein Fehler ist aufgetreten! Versuch es erneut.", Toast.LENGTH_SHORT).show();
                                        progressBar.setVisibility(View.GONE);
                                    }

                                }
                            });

                        } else {
                            Toast.makeText(RegisterUser.this, "Ein Fehler ist aufgetreten! Versuch es erneut.", Toast.LENGTH_SHORT).show();
                            progressBar.setVisibility(View.GONE);
                        }

                    }
                });


    }

}``` 

标签： javaandroidfirebasefirebase-realtime-database