일정시간이후에 실행하기

package com.example.sampledelayed;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    TextView textView;
    Handler handler=new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView =findViewById(R.id.textView);

        Button button =findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                request();
            }
        });

    }
    private void request(){
        String title ="원격요청";
        String message="데이터를 요청 하시겠습니까?";
        String titleButtonYes="예";
        String titleButtonNo="아니요";

        AlertDialog dialog =makeRequestDialog(title,message,titleButtonYes,titleButtonNo);
        dialog.show();

        textView.setText("대화상자 표시중..");
    }

    private AlertDialog makeRequestDialog(CharSequence title, CharSequence message, CharSequence titleButtonYes, CharSequence titleButtonNo) {
        AlertDialog.Builder requestDialog = new AlertDialog.Builder(this);
        requestDialog.setTitle(title);
        requestDialog.setMessage(message);
        requestDialog.setPositiveButton(titleButtonYes, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                textView.setText("5초후에 결과표시됨");

                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        textView.setText("요청완료됨");
                    }
                },5000);
            }
        });
        requestDialog.setNegativeButton(titleButtonNo, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) { }
        });
         return requestDialog.create();

    }
}