homeactivity.java sp

package com.example.saigopinarimeti.helloworld;

import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class HomeActivity extends AppCompatActivity {

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

        textView = findViewById(R.id.text);

        SharedPreferences sharedPreferences = getSharedPreferences("user",MODE_PRIVATE);

        if (sharedPreferences!=null){
            String username = sharedPreferences.getString("username","sai");
            textView.setText("Logged in as "+username);
        }

    }
}