This document describes an Android application that saves user input from an EditText field to shared preferences. When the application is opened again, it retrieves the previously saved input from shared preferences and displays it in the EditText. The user can update the saved input by entering new text and clicking a button, which saves the new input back to shared preferences.

1. Guardar
package com.example.guardar;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText et1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et1=(EditText)findViewById(R.id.editText1);
SharedPreferences prefe=getSharedPreferences("datos",Context.MODE_PRIVATE);
et1.setText(prefe.getString("mail",""));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void ejecutar(View v) {
SharedPreferences preferencias=getSharedPreferences("datos",Context.MODE_PRIVATE);
Editor editor=preferencias.edit();
editor.putString("mail", et1.getText().toString());
editor.commit();
finish();
}
}
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