Add sample code for PreferenceFragment.

Change-Id: I64222124daa117a2ea61dc55f2e26af78d3689c2

samples/ApiDemos/src/com/example/android/apis/app/FragmentPreferences.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.apis.app;
+
+import com.example.android.apis.R;
+import com.example.android.apis.Shakespeare;
+
+import android.app.Activity;
+import android.app.Fragment;
+import android.app.ListFragment;
+import android.content.Context;
+import android.content.Intent;
+import android.content.res.TypedArray;
+import android.net.Uri;
+import android.os.Bundle;
+import android.preference.CheckBoxPreference;
+import android.preference.EditTextPreference;
+import android.preference.ListPreference;
+import android.preference.PreferenceCategory;
+import android.preference.PreferenceFragment;
+import android.preference.PreferenceScreen;
+import android.util.Log;
+import android.view.View;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+
+/**
+ * Demonstration of PreferenceFragment, splitting the activity into a
+ * list categories and preferences.
+ */
+//BEGIN_INCLUDE(activity)
+public class FragmentPreferences extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        // The content for this activity places CategoriesFragment to one
+        // side, and leaves the rest to dynamically add the prefs fragment.
+        setContentView(R.layout.fragment_preferences);
+    }
+
+    /**
+     * This fragment shows a list of categories the user can pick.  When they
+     * pick one, the corresponding preferences fragment is created and shown.
+     */
+    public static class CategoriesFragment extends ListFragment {
+        @Override
+        public void onActivityCreated(Bundle savedInstanceState) {
+            super.onActivityCreated(savedInstanceState);
+            setListAdapter(new ArrayAdapter<String>(getActivity(),
+                    android.R.layout.simple_list_item_1,
+                    new String[] { "Prefs 1", "Prefs 2" }));
+            switchPreferences(0);
+        }
+
+        @Override
+        public void onListItemClick(ListView l, View v, int position, long id) {
+            switchPreferences(position);
+        }
+
+        /**
+         * Show the given preferences, replacing whatever was last shown.
+         */
+        void switchPreferences(int which) {
+            Fragment f = which == 0 ? new Prefs1Fragment() : new Prefs2Fragment();
+            getActivity().openFragmentTransaction().replace(R.id.prefs, f).commit();
+        }
+    }
+
+    public static class Prefs1Fragment extends PreferenceFragment {
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            // Load the preferences from an XML resource
+            addPreferencesFromResource(R.xml.preferences);
+        }
+    }
+
+    public static class Prefs2Fragment extends PreferenceFragment {
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+
+            // Load the preferences from an XML resource
+            addPreferencesFromResource(R.xml.preference_dependencies);
+        }
+    }
+}
+//END_INCLUDE(activity)