1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.contacts.preference;
18
19import com.android.contacts.R;
20import com.android.contacts.activities.PeopleActivity;
21
22import android.app.ActionBar;
23import android.content.Context;
24import android.content.Intent;
25import android.os.Bundle;
26import android.preference.PreferenceActivity;
27import android.view.MenuItem;
28
29import java.util.List;
30
31/**
32 * Contacts settings.
33 */
34public final class ContactsPreferenceActivity extends PreferenceActivity {
35
36    @Override
37    protected void onCreate(Bundle savedInstanceState) {
38        super.onCreate(savedInstanceState);
39
40        // This Activity will always fall back to the "top" Contacts screen when touched on the
41        // app up icon, regardless of launch context.
42        ActionBar actionBar = getActionBar();
43        if (actionBar != null) {
44            actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP, ActionBar.DISPLAY_HOME_AS_UP);
45        }
46    }
47
48    /**
49     * Populate the activity with the top-level headers.
50     */
51    @Override
52    public void onBuildHeaders(List<Header> target) {
53        loadHeadersFromResource(R.xml.preference_headers, target);
54    }
55
56    /**
57     * Returns true if there are no preferences to display and therefore the
58     * corresponding menu item can be removed.
59     */
60    public static boolean isEmpty(Context context) {
61        return !context.getResources().getBoolean(R.bool.config_sort_order_user_changeable)
62                && !context.getResources().getBoolean(R.bool.config_display_order_user_changeable);
63    }
64
65    @Override
66    public boolean onOptionsItemSelected(MenuItem item) {
67        switch (item.getItemId()) {
68            case android.R.id.home: {
69                Intent intent = new Intent(this, PeopleActivity.class);
70                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
71                startActivity(intent);
72                finish();
73                return true;
74            }
75        }
76        return false;
77    }
78}
79