Android SharedPreferences Example

And paste the following 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>

 

 

The code of this tutorial is very simple. Basically there are two main operations one can perform when using SharedPreferences  in Android. That is store data and load data. You should:

• Create a new SharedPreferences object.
• Then get an Editor instance from that object. The Editor object will help you manipulate the data that you’ve stored.
• Use putString, putBoolean methods to store a pair key/value
• Use getBoolean, getString to get the values you want.

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

}