How To Press Back Again in to Exit in Application Android Studio Beginner Tutorials

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Activity.java

package com.usmsof.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class HomeActivity extends AppCompatActivity {



    private long backpressedTime;



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

    }


    @Override
    public void onBackPressed() {
        if (backpressedTime+2000>System.currentTimeMillis()) {
            super.onBackPressed();
            return;
        } else {
            Toast.makeText(this,"press back again to exit", Toast.LENGTH_SHORT).show();
        }
        backpressedTime=System.currentTimeMillis();
    }

}