May 19, 2014

Save something in SharedPreferences using SharedPreferences.Editor

If you want to save something (String, setting, value...) in SharedPreferences, such that it can be retrieved later after Activity exited, we can use SharedPreferences.Editor.

Example:

package com.example.androidsharedpreferences;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;

public class MainActivity extends Activity {
 
 String[] dayOfWeek = {"Sunday", "Monday", "Tuesday",
   "Wednesday", "Thursday", "Friday", "Saturday"};
 
 EditText editText;
 Button buttonSave;
 Spinner spinner;
 
 SharedPreferences prefs;
 final String KEY_SavedText = "Saved Text";
 final String KEY_SavedSel = "Saved Selection";

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  editText = (EditText)findViewById(R.id.edittext);
  buttonSave = (Button)findViewById(R.id.save);
  spinner = (Spinner)findViewById(R.id.spinner);
  
  ArrayAdapter<String> adapter = 
   new ArrayAdapter<String>(this, 
    android.R.layout.simple_spinner_item, dayOfWeek);
  adapter.setDropDownViewResource(
   android.R.layout.simple_spinner_dropdown_item);
  spinner.setAdapter(adapter);
  
  //retrieve saved preferences
  prefs = getPreferences(MODE_PRIVATE);
  String prefsString = prefs.getString(KEY_SavedText, null);
  if(prefsString != null){
   editText.setText(prefsString);
  }
  int prefsInt = prefs.getInt(KEY_SavedSel, -1);
  if(prefsInt != -1){
   spinner.setSelection(prefsInt);
  }
  
  //Save EditText if buttonSave clicked
  buttonSave.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
    editor.putString(KEY_SavedText, editText.getText().toString());
    editor.commit();
   }
  });
  
  //Save Spinner selection
  spinner.setOnItemSelectedListener(new OnItemSelectedListener(){

   @Override
   public void onItemSelected(AdapterView<?> parent, View view,
     int position, long id) {
    SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
    editor.putInt(KEY_SavedSel, position);
    editor.commit();
   }

   @Override
   public void onNothingSelected(AdapterView<?> parent) {}
  });

 }

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.androidsharedpreferences.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="android-coding.blogspot.com" />
    
    <EditText
        android:id="@+id/edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/save"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Save Text" />
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

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