Android SharedPreferences Example

• Shared Preferences: Prrimitive data storage (boolean Strings, ints etc..).
• Internal Storage: Device memory storage.
• External Storage: Store public data on storage media, like SD cards.
• SQLite Database.

With SharedPreferences we talk about permanent storage about the application. That means that if you uninstall the application, all your data will be lost, so this is application specific. In contrast , SQLite stores structured data in a database, so even when you delete the application the data won’t be lost.
For this tutorial, we will use the following tools in a Windows 64-bit platform:




And paste the following code :

xml_code

01	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

02	xmlns:tools="http://schemas.android.com/tools"

03	android:layout_width="match_parent"

04	android:layout_height="match_parent"

05	android:orientation="vertical"

06	tools:context=".MainActivity" >

07

08

<CheckBox

09	android:id="@+id/checkBox1"

10	android:layout_width="wrap_content"

11	android:layout_height="wrap_content"

12	android:text="Check Box" />

13

14

<EditText

15	android:id="@+id/editText1"

16	android:layout_width="match_parent"

17	android:layout_height="wrap_content"

18	android:text="Enter Your Name...">

19

20	<requestFocus />

21	</EditText>

22

23

<Button

24	android:id="@+id/button1"

25	android:layout_width="wrap_content"

26	android:layout_height="wrap_content"

27	android:text="Save" />

28

29	</LinearLayout>

main activity

01	package com.javacodegeeks.android.androidsharedpreferences;

02

03	import android.app.Activity;

04	import android.content.SharedPreferences;

05	import android.content.SharedPreferences.Editor;

06	import android.os.Bundle;

07	import android.preference.PreferenceManager;

08	import android.view.View;

09	import android.view.View.OnClickListener;

10	import android.widget.Button;

11	import android.widget.CheckBox;

12	import android.widget.EditText;

13

14	public class MainActivity extends Activity implements OnClickListener {

15

16	CheckBox checkBox;

17	EditText editText;

18	Button button;

19

20

@Override

21	protected void onCreate(Bundle savedInstanceState) {

22	// TODO Auto-generated method stub

23	super.onCreate(savedInstanceState);

24	setContentView(R.layout.main);

25

26	checkBox = (CheckBox) findViewById(R.id.checkBox1);

27	editText = (EditText) findViewById(R.id.editText1);

28	button = (Button) findViewById(R.id.button1);

29	button.setOnClickListener(this);

30	loadSavedPreferences();

31

}

32

33	private void loadSavedPreferences() {

34	SharedPreferences sharedPreferences = PreferenceManager

35	.getDefaultSharedPreferences(this);

36	boolean checkBoxValue = sharedPreferences.getBoolean("CheckBox_Value", false);

37	String name = sharedPreferences.getString("storedName", "YourName");

38	if (checkBoxValue) {

39	checkBox.setChecked(true);

40

} else {

41	checkBox.setChecked(false);

42

}

43

44	editText.setText(name);

45

}

46

47	private void savePreferences(String key, boolean value) {

48	SharedPreferences sharedPreferences = PreferenceManager

49	.getDefaultSharedPreferences(this);

50	Editor editor = sharedPreferences.edit();

51	editor.putBoolean(key, value);

52	editor.commit();

53

}

54

55	private void savePreferences(String key, String value) {

56	SharedPreferences sharedPreferences = PreferenceManager

57	.getDefaultSharedPreferences(this);

58	Editor editor = sharedPreferences.edit();

59	editor.putString(key, value);

60	editor.commit();

61

}

62

63

@Override

64	public void onClick(View v) {

65	// TODO Auto-generated method stub

66	savePreferences("CheckBox_Value", checkBox.isChecked());

67	if (checkBox.isChecked())

68	savePreferences("storedName", editText.getText().toString());

69

70

finish();

71

}

72

73

}

Download Eclipse Project

This was an Android SavedPreferences Example. Download the Eclipse Project of this tutorial: AndroidSharedPreferences.zip