package com.example.sharedpreferences;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private EditText saveData;
    private TextView retrieveData;
    private Button saveBtn;
    private Button showBtn;

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

        retrieveData = (TextView)findViewById(R.id.load_data);
        saveData = (EditText)findViewById(R.id.enter_data);
        saveBtn = (Button)findViewById(R.id.save);
        showBtn = (Button)findViewById(R.id.show);
        saveBtn.setOnClickListener(this);
        showBtn.setOnClickListener(this);
        showBtn.setEnabled(false);
        if(retrieveName().length()>0)
            showBtn.setEnabled(true);
    }
    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.save) {
            saveName("name", saveData.getText().toString());
            showBtn.setEnabled(true);
        }

        if (v.getId() == R.id.show) {
            retrieveData.setText(retrieveName());
        }
    }

    private void saveName(String key, String value){
        SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(key, value);
        editor.commit();
    }

    private String retrieveName(){
        SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
        String savedData = sharedPreferences.getString("name", "");
        return savedData;
    }
}