如何将数据添加到实时数据库？

Question

我只是想创建一个包含一些数据的帐户。不幸的是，我不知道错误在哪里，并且在注册过程中创建了帐户但数据没有保存在实时数据库中。

mAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(task -> {
    if (task.isSuccessful()) {
        FirebaseUser user = mAuth.getCurrentUser();
        reference = FirebaseDatabase.getInstance().getReference("Users").child(user.getUid());

        HashMap<String, Object> hashMap = new HashMap<>();
        hashMap.put("username", username);
        hashMap.put("email", email);
        hashMap.put("id", user.getUid());
        hashMap.put("imageURL", "default");
        hashMap.put("status", "offline");

        reference.setValue(hashMap).addOnCompleteListener(task1 -> {
            if (task1.isSuccessful()) {
                Toast.makeText(RegisterActivity.this, "Registered Successfully", Toast.LENGTH_SHORT).show();
                startActivity(new Intent(RegisterActivity.this, StartActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK));
            }else{
                Toast.makeText(RegisterActivity.this, "Registered Failed", Toast.LENGTH_SHORT).show();
            }
        });
    }
});

Answer 1

当Task 失败时，其中会有一个异常，其中包含有关失败原因的详细信息。记录异常以查找问题的根本原因：

reference.setValue(hashMap).addOnCompleteListener(task1 -> {
    if (task1.isSuccessful()) {
        Toast.makeText(RegisterActivity.this, "Registered Successfully", Toast.LENGTH_SHORT).show();
        startActivity(new Intent(RegisterActivity.this, StartActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK));
    }else{
        Toast.makeText(RegisterActivity.this, "Registered Failed", Toast.LENGTH_SHORT).show();
        Log.e("FIREBASE", "Registering user in database failed", task.getException()); // ?
    }
});

一旦您收到异常，请尝试解决它所说的内容，或搜索错误消息以查看其他人之前是否遇到过同样的问题。