为什么“订阅” function 没有注册？ RxJava Android Studio

Question

I'm writing code for a splash screen as part of a project but when I am trying to use RxJava all the other functions are working fine until I get to 'subscribe' which isn't registering so I'm wondering am I missing a library I didn't import or something?

The error message I get when trying to run is: 'Cannot resolve method 'subscribe'. I've tried asking the tutorial creator, as well as looking at the top relevant questions about the 'subscribe' function on StackOverflow and even looking at the full list of methods in the Completable library but I can't find a solution so I'm really desperate, please help

These are my dependencies:

implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
implementation 'io.reactivex.rxjava2:rxjava:2.2.20'

My Code:

package codebymech.fyprideshareapp;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Notification;
import android.os.Bundle;
import android.widget.Toast;

import java.util.concurrent.TimeUnit;

import io.reactivex.Completable;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.functions.Action;


public class Activity_SplashScreen extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        delay_Splash();
    }

        private void delay_Splash() {
            Completable.timer(delay: 5, TimeUnit.SECONDS,
                AndroidSchedulers.mainThread())
                .subscribe(new Action() {
                    @Override
                    public void run() throws Exception {
                        Toast.makeText(Activity_SplashScreen.this, "!! Splash Screen Finished", Toast.LENGTH_SHORT).show();
                    }

                });
    }
}

Part of tutorial where the code is from: https://youtu.be/144TuYxEu2M?t=489

Answer 1

You have to remove delay: . This is not possible in Java. If you look at the video, you see a delay: in given method, but it is added by the IDE (IntelliJ) in order to give you a hint, which parameter you are currently editing.

Import

import io.reactivex.Completable;
import io.reactivex.functions.Action;
import io.reactivex.schedulers.Schedulers;

Java8

   Completable.timer(5, TimeUnit.SECONDS,
            Schedulers.trampoline())
            .subscribe(() -> {
               System.out.println("x");
            });

Java7

    Completable.timer(5, TimeUnit.SECONDS,
            Schedulers.trampoline())
            .subscribe(new Action() {
                @Override
                public void run() throws Exception {
                    System.out.println("x");
                }
            });