如何使用 RunOnUIThread 方法显示 Toast

Question

I have been trying to figure out why the toast is not showing. from the code, the onReceive method does get executed and change the button color, but the Toast does not display. I dont know why.

 client = new Client(
                (publisher, topic, params) -> runOnUiThread(
                        () -> onReceive((Publisher) publisher, topic, params)
                ));

            client.connectToServer("192.168.3.52",5050);

  private void onReceive(Publisher publisher, String topic, Map<String, Object> params) {


        sendBtn.setBackgroundColor(getColor(R.color.white));

        Toast.makeText(MainActivity.this, "Hey", Toast.LENGTH_LONG).show();

    }

Imports

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

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

import java.io.Serializable;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

Class name

public class MainActivity extends AppCompatActivity {

Answer 1

hey can you share your file name and import section........ or else try to run on clicklistener after sendbtn and try to link with your button