Add many methods to make preference activity simpler

src/fr/nrz/androidlib/activities/NrzSettingsActivity.java

@@ -28,26 +28,31 @@ package fr.nrz.androidlib.activities;
  * either expressed or implied, of the FreeBSD Project.
  */
 
+import java.util.Vector;
+
+import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.os.Build;
 import android.os.Bundle;
+import android.preference.CheckBoxPreference;
+import android.preference.ListPreference;
 import android.preference.Preference;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
 
-public abstract class NrzSettingsActivity extends PreferenceActivity {
+public class NrzSettingsActivity extends PreferenceActivity {
 	private static final boolean ALWAYS_SIMPLE_PREFS = false;
 	protected static Context _context;
 	protected static int _prefsRessourceFile;
-	protected static Preference.OnPreferenceChangeListener sBindPreferenceListener;
+	protected static Vector<BindObjectPref> _boolPrefs = new Vector<BindObjectPref>();
+	protected static Vector<BindObjectPref> _stringPrefs = new Vector<BindObjectPref>();
 
 	@Override
 	protected void onPostCreate(final Bundle savedInstanceState) {
 		super.onPostCreate(savedInstanceState);
 		_context = getBaseContext();
-
 		setupSimplePreferencesScreen();
 	}
 
@@ -68,8 +73,6 @@ public abstract class NrzSettingsActivity extends PreferenceActivity {
 		bindPreferences();
 	}
 
-	protected abstract void bindPreferences();
-
 	/** {@inheritDoc} */
 	@Override
 	public boolean onIsMultiPane() {
@@ -109,11 +112,11 @@ public abstract class NrzSettingsActivity extends PreferenceActivity {
 	public static void bindPreferenceBooleanToValue(final Preference preference, final Boolean defValue) {
 		// Set the listener to watch for value changes.
 		preference
-		.setOnPreferenceChangeListener(sBindPreferenceListener);
+		.setOnPreferenceChangeListener(_bindPreferenceListener);
 
 		// Trigger the listener immediately with the preference's
 		// current value.
-		sBindPreferenceListener.onPreferenceChange(
+		_bindPreferenceListener.onPreferenceChange(
 				preference,
 				PreferenceManager.getDefaultSharedPreferences(
 						preference.getContext()).getBoolean(
@@ -123,20 +126,96 @@ public abstract class NrzSettingsActivity extends PreferenceActivity {
 				);
 	}
 
-	public static void bindPreferenceStringToValue(final Preference preference) {
+	public static void bindPreferenceStringToValue(final Preference preference, final String defValue) {
 		// Set the listener to watch for value changes.
 		preference
-		.setOnPreferenceChangeListener(sBindPreferenceListener);
+		.setOnPreferenceChangeListener(_bindPreferenceListener);
 
 		// Trigger the listener immediately with the preference's
 		// current value.
-		sBindPreferenceListener.onPreferenceChange(
+		_bindPreferenceListener.onPreferenceChange(
 				preference,
 				PreferenceManager.getDefaultSharedPreferences(
 						preference.getContext()).getString(
 								preference.getKey(),
-								""
+								defValue
 								)
 				);
 	}
+
+	/**
+	 * This fragment shows data and sync preferences only. It is used when the
+	 * activity is showing a two-pane settings UI.
+	 */
+	@TargetApi(Build.VERSION_CODES.HONEYCOMB)
+	public static class DataSyncPreferenceFragment extends PreferenceFragment {
+		@Override
+		public void onCreate(final Bundle savedInstanceState) {
+			super.onCreate(savedInstanceState);
+			addPreferencesFromResource(_prefsRessourceFile);
+
+			// Bind the summaries of EditText/List/Dialog/Ringtone preferences
+			// to their values. When their values change, their summaries are
+			// updated to reflect the new value, per the Android Design
+			// guidelines.
+			for (int i=0; i < _stringPrefs.size(); i++) {
+				bindPreferenceStringToValue(findPreference(_stringPrefs.get(i).name),
+						(String) _stringPrefs.get(i).value);
+			}
+			for (int i=0; i < _boolPrefs.size(); i++) {
+				bindPreferenceBooleanToValue(findPreference(_boolPrefs.get(i).name),
+						(Boolean) _boolPrefs.get(i).value);
+			}
+		}
+	}
+
+	private void bindPreferences() {
+		// Bind the summaries of EditText/List/Dialog/Ringtone preferences to
+		// their values. When their values change, their summaries are updated
+		// to reflect the new value, per the Android Design guidelines.
+		for (int i=0; i < _stringPrefs.size(); i++) {
+			bindPreferenceStringToValue(findPreference(_stringPrefs.get(i).name),
+					(String) _stringPrefs.get(i).value);
+		}
+
+		for (int i=0; i < _boolPrefs.size(); i++) {
+			bindPreferenceBooleanToValue(findPreference(_boolPrefs.get(i).name),
+					(Boolean) _boolPrefs.get(i).value);
+		}
+	}
+
+	// The preference object, it's only a key value pair
+	protected class BindObjectPref {
+		public String name;
+		public Object value;
+		public BindObjectPref(final String prefName, final Object prefVal) {
+			name = prefName;
+			value = prefVal;
+		}
+	}
+
+	/**
+	 * A preference value change listener that updates the preference's summary
+	 * to reflect its new value.
+	 */
+	private static Preference.OnPreferenceChangeListener _bindPreferenceListener = new Preference.OnPreferenceChangeListener() {
+		@Override
+		public boolean onPreferenceChange(final Preference preference, final Object value) {
+			if (preference instanceof ListPreference) {
+				handleListPreference(preference.getKey(), value.toString(), (ListPreference) preference);
+
+			} else if (preference instanceof CheckBoxPreference) {
+				handleCheckboxPreference(preference.getKey(), (Boolean)value);
+			} else {
+				// For all other preferences, set the summary to the value's
+				// simple string representation.
+				//preference.setSummary(boolValue);
+			}
+			return true;
+		}
+	};
+
+	protected static void handleCheckboxPreference(final String key, final Boolean value) {}
+	protected static void handleListPreference(final String key, final String value,
+			final ListPreference preference) {}
 }