User management UI: take 2

Single screen user management, also visible on secondary users.
Work in progress, especially with respect to synchronizing with
the Me profile.

Change-Id: Id6e94a85d53356847e4e019c52e3388de9ecb354

src/com/android/settings/users/UserPreference.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2012 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.settings.users;
+
+import com.android.internal.util.CharSequences;
+import com.android.settings.R;
+
+import android.content.Context;
+import android.os.UserManager;
+import android.preference.Preference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.View.OnClickListener;
+
+public class UserPreference extends Preference {
+
+    public static final int USERID_UNKNOWN = -10;
+
+    private OnClickListener mDeleteClickListener;
+    private int mSerialNumber = -1;
+    private int mUserId = USERID_UNKNOWN;
+
+    public UserPreference(Context context, AttributeSet attrs) {
+        this(context, attrs, USERID_UNKNOWN, false, null);
+    }
+
+    UserPreference(Context context, AttributeSet attrs, int userId, boolean showDelete,
+            OnClickListener deleteListener) {
+        super(context, attrs);
+        if (showDelete) {
+            setWidgetLayoutResource(R.layout.preference_user_delete_widget);
+            mDeleteClickListener = deleteListener;
+        }
+        mUserId = userId;
+    }
+
+    @Override
+    protected void onBindView(View view) {
+        view.setClickable(true);
+        view.setFocusable(true);
+        View deleteView = view.findViewById(R.id.trash_user);
+        if (deleteView != null) {
+            deleteView.setOnClickListener(mDeleteClickListener);
+            deleteView.setTag(this);
+        }
+        super.onBindView(view);
+    }
+
+    public int getSerialNumber() {
+        if (mSerialNumber < 0) {
+            // If the userId is unknown
+            if (mUserId == USERID_UNKNOWN) return Integer.MAX_VALUE;
+            mSerialNumber = ((UserManager) getContext().getSystemService(Context.USER_SERVICE))
+                    .getUserSerialNumber(mUserId);
+            if (mSerialNumber < 0) return mUserId;
+        }
+        return mSerialNumber;
+    }
+
+    public int getUserId() {
+        return mUserId;
+    }
+
+    public int compareTo(Preference another) {
+        if (another instanceof UserPreference) {
+            return getSerialNumber() > ((UserPreference) another).getSerialNumber() ? 1 : -1;
+        } else {
+            return 1;
+        }
+    }
+}