我试着写我的信使。我需要在FirebaseAuth中注册新用户。为此，我需要在isEmailVerified()中得到"真"。我的程序发送电子邮件验证给当前用户。这意味着，当前用户不是空的，但在下一行我调用isEmailVerified()，它返回假，即使电子邮件是验证的。

mAuth.createUserWithEmailAndPassword(edEmail.getText().toString(), edPassword.getText().toString())
    .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (task.isSuccessful()) {

                FirebaseUser currentUser = mAuth.getCurrentUser();
                if (currentUser != null) {
                    sendEmailVerify(currentUser);

                    if (currentUser.isEmailVerified()) {
                        StartActivity(MainActivity.class);
                    }
                }else{
                    Toast.makeText(RegActivity.this, "Error", Toast.LENGTH_SHORT).show();
                }
            } else {
                Toast.makeText(RegActivity.this, "email or password error", Toast.LENGTH_SHORT).show();
            }
        }
    });

private void sendEmailVerify(FirebaseUser currentUser) {
    currentUser.sendEmailVerification().addOnCompleteListener(new OnCompleteListener<Void>() {
        @Override
        public void onComplete(@NonNull Task<Void> task) {
            if (task.isSuccessful()) {

            } else {

            }
        }
    });
}

public void StartActivity(Class activity) {
    Intent intent = new Intent(RegActivity.this, activity);
    startActivity(intent);
    RegActivity.this.finish();
}

我的程序必须等到你的电子邮件将被验证的时刻。