如何在Firebase电子邮件验证中使用操作代码设置

我的Firebase验证电子邮件工作正常。但是,只要我尝试添加 actionCodeSettings

我试图实现的是,当在安装应用程序的Android设备上单击链接时,它会将用户返回到应用程序。

如果在其他任何地方单击,则除了说明帐户已验证的常见消息外,无需执行任何操作。

动作码设置 为了得到这种行为?

                        String url = "com.app/verify?uid=" + user.getUid();
                        ActionCodeSettings actionCodeSettings = ActionCodeSettings.newBuilder()
                                .setUrl(url)
                                .setAndroidPackageName("com.app", false, null)
                                .build();



                        user.sendEmailVerification(actionCodeSettings) 
                                .addOnCompleteListener(new OnCompleteListener<Void>() {
                                    @Override
                                    public void onComplete(@NonNull Task<Void> task) {
                                        if (task.isSuccessful()) {
                                            Log.d(TAG, "Email sent.");
                                            Toast.makeText(MainActivity.this, "Registration successful. Please verify your account by clicking on the link sent to your email address.",
                                                    Toast.LENGTH_LONG).show();
                                        }else {

                                            Log.d(TAG, "Email not sent");
                                            Toast.makeText(MainActivity.this, "Registration successful. However, verification email could not be send.",
                                                    Toast.LENGTH_LONG).show();
                                        }
                                    }
                                });