Initial Contribution
diff --git a/src/com/android/contacts/ContactsPreferenceActivity.java b/src/com/android/contacts/ContactsPreferenceActivity.java
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+++ b/src/com/android/contacts/ContactsPreferenceActivity.java
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+/*
+ * Copyright (C) 2008 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.android.contacts;
+
+import android.os.Bundle;
+import android.preference.PreferenceActivity;
+
+public final class ContactsPreferenceActivity extends PreferenceActivity {
+    /**
+     * The type of data to display in the main contacts list. 
+     */
+    static final String PREF_DISPLAY_TYPE = "display_system_group";
+
+    /** Unknown display type. */
+    static final int DISPLAY_TYPE_UNKNOWN = -1;
+    /** Display all contacts */
+    static final int DISPLAY_TYPE_ALL = 0;
+    /** Display all contacts that have phone numbers */
+    static final int DISPLAY_TYPE_ALL_WITH_PHONES = 1;
+    /** Display a system group */
+    static final int DISPLAY_TYPE_SYSTEM_GROUP = 2;
+    /** Display a user group */
+    static final int DISPLAY_TYPE_USER_GROUP = 3;
+
+    /**
+     * Info about what to display. If {@link #PREF_DISPLAY_TYPE}
+     * is {@link #DISPLAY_TYPE_SYSTEM_GROUP} then this will be the system id.
+     * If {@link #PREF_DISPLAY_TYPE} is {@link #DISPLAY_TYPE_USER_GROUP} then this will
+     * be the group name.
+     */ 
+    static final String PREF_DISPLAY_INFO = "display_group";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        
+        // Load the preferences from an XML resource
+        addPreferencesFromResource(R.xml.preferences);
+    }
+
+}