Android How to - Programmatically Retrieving and Modifying the Preferences Values

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To make use of the preferences in your application, you use the SharedPreferences class.

The following code shows how to programmatically Retrieving and Modifying the Preferences Values.

Example

package com.java2s.myapplication3.app;
/*from   w w  w .jav a2s  .  c  o m*/
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SharedPreferences appPrefs =
                getSharedPreferences("com.java2s.UsingPreferences_preferences",
                        MODE_PRIVATE);
        DisplayText(appPrefs.getString("editTextPref", ""));

        appPrefs = getSharedPreferences("com.java2s.UsingPreferences_preferences",
                MODE_PRIVATE);
        SharedPreferences.Editor prefsEditor = appPrefs.edit();
        prefsEditor.putString("editTextPref", "new value");
        prefsEditor.commit();
    }

    private void DisplayText(String str) {
        Toast.makeText(getBaseContext(), str, Toast.LENGTH_LONG).show();
    }
}

Note

Here is the code to create the Preference.

Create a file at res/xml/myapppreferences.xml and populate the myapppreferences.xml file as follows:

         <?xml version="1.0" encoding="utf-8"?>
         <PreferenceScreen
             xmlns:android="http://schemas.android.com/apk/res/android">
             <PreferenceCategory android:title="Category 1">
                 <CheckBoxPreference
                     android:title="Checkbox"
                     android:defaultValue="false"
                     android:summary="True or False"
                     android:key="checkboxPref" />
                 </PreferenceCategory>
             <PreferenceCategory android:title="Category 2">
                 <EditTextPreference
                     android:summary="Enter a string"
                     android:defaultValue="[Enter a string here]"
                     android:title="Edit Text"
                     android:key="editTextPref" />
                 <RingtonePreference
                     android:summary="Select a ringtone"
                     android:title="Ringtones"
                     android:key="ringtonePref" />
                 <PreferenceScreen
                     android:title="Second Preference Screen"
                  android:summary= "Click here to go to the second Preference Screen"
                  android:key="secondPrefScreenPref" >
                  <EditTextPreference
                      android:summary="Enter a string"
                      android:title="Edit Text (second Screen)"
                      android:key="secondEditTextPref" />
              </PreferenceScreen>
          </PreferenceCategory>
      </PreferenceScreen>

Java code

      import android.os.Bundle;
      import android.preference.PreferenceActivity;
/*from  w w w.  j av a  2  s .  c om*/
      public class AppPreferenceActivity extends PreferenceActivity {
          @Override
          public void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              //load the preferences from an XML file
              addPreferencesFromResource(R.xml.myapppreferences);
          }
      }

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