Settings.java revision 25af150c9804cbca83461588fa5277908baa943d 
1/*
2 * Copyright (C) 2008 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.settings;
18
19import android.app.Fragment;
20import android.content.Intent;
21import android.os.Bundle;
22import android.preference.PreferenceActivity;
23
24import java.util.List;
25
26/**
27 * Top-level settings activity to handle single pane and double pane UI layout.
28 */
29public class Settings extends PreferenceActivity {
30
31    // TODO: Update Call Settings based on airplane mode state.
32
33    /**
34     * Checks if the component name in the intent is different from the Settings class and
35     * returns the class name to load as a fragment.
36     */
37    private String getStartingFragmentClass(Intent intent) {
38        final String intentClass = intent.getComponent().getClassName();
39        if (intentClass.equals(getClass().getName())) return null;
40
41        return intentClass;
42    }
43
44    /**
45     * Override initial header when an activity-alias is causing Settings to be launched
46     * for a specific fragment encoded in the android:name parameter.
47     */
48    @Override
49    public Header onGetInitialHeader() {
50        String fragmentClass = getStartingFragmentClass(super.getIntent());
51        if (fragmentClass != null) {
52            Header header = new Header();
53            header.fragment = fragmentClass;
54            return header;
55        }
56        return super.onGetInitialHeader();
57    }
58
59    /**
60     * Populate the activity with the top-level headers.
61     */
62    @Override
63    public void onBuildHeaders(List<Header> target) {
64        loadHeadersFromResource(R.xml.settings_headers, target);
65
66        updateHeaderList(target);
67    }
68
69    private void updateHeaderList(List<Header> target) {
70        int i = 0;
71        while (i < target.size()) {
72            Header header = target.get(i);
73            long id = header.id;
74            if (id == R.id.dock_settings) {
75                if (!needsDockSettings())
76                    target.remove(header);
77            } else if (id == R.id.operator_settings || id == R.id.manufacturer_settings) {
78                Utils.updateHeaderToSpecificActivityFromMetaDataOrRemove(this, target, header);
79            } else if (id == R.id.call_settings) {
80                if (!Utils.isVoiceCapable(this))
81                    target.remove(header);
82            }
83            if (target.get(i) == header)
84                i++;
85        }
86    }
87
88    private boolean needsDockSettings() {
89        return getResources().getBoolean(R.bool.has_dock_settings);
90    }
91}
92