Using a PreferenceFragment
Description
In Android, you can use the PreferenceActivity base class to display an activity for the user to edit the preferences.
You can use the PreferenceFragment class to do the same thing.
Example
Populate the res/xml/preferences.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 of False"
android:key="checkboxPref" />
</PreferenceCategory>
<PreferenceCategory android:title="Category 2">
<EditTextPreference
android:name="EditText"
android:summary="Enter a string"
android:defaultValue="[Enter a string here]"
android:title="Edit Text"
android:key="editTextPref" />
<RingtonePreference
android:name="Ringtone Preference"
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:name="EditText"
android:summary="Enter a string"
android:title="Edit Text (second Screen)"
android:key="secondEditTextPref" />
</PreferenceScreen>
</PreferenceCategory>
</PreferenceScreen>
Populate the Fragment1.java file as follows:
import android.os.Bundle;
import android.preference.PreferenceFragment;
public class Fragment1 extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//---load the preferences from an XML file---
addPreferencesFromResource(R.xml.preferences);
}
}
Modify the MainActivity.java file as shown:
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
// www . j a v a 2 s .c o m
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
Fragment1 fragment1 = new Fragment1();
fragmentTransaction.replace(android.R.id.content, fragment1);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
}
If you look at the File Explorer (available in the DDMS perspective), you will be able to locate the
preferences file located in the
/data/data/com.java2s.PreferenceFragmentExample/shared_prefs/ folder.
All changes made by the user are persisted in this file.