1 /*
2  * Copyright (C) 2010 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 
17 package com.android.settings;
18 
19 import android.speech.tts.TtsEngines;
20 import android.support.v7.preference.Preference;
21 import android.support.v7.preference.PreferenceCategory;
22 import android.support.v7.preference.PreferenceGroup;
23 
24 /**
25  * Settings screen for voice input/output.
26  */
27 public class VoiceInputOutputSettings {
28 
29     private static final String TAG = "VoiceInputOutputSettings";
30 
31     private static final String KEY_VOICE_CATEGORY = "voice_category";
32     private static final String KEY_TTS_SETTINGS = "tts_settings";
33 
34     private PreferenceGroup mParent;
35     private PreferenceCategory mVoiceCategory;
36     private Preference mVoiceInputSettingsPref;
37     private Preference mTtsSettingsPref;
38     private final SettingsPreferenceFragment mFragment;
39     private final TtsEngines mTtsEngines;
40 
VoiceInputOutputSettings(SettingsPreferenceFragment fragment)41     public VoiceInputOutputSettings(SettingsPreferenceFragment fragment) {
42         mFragment = fragment;
43         mTtsEngines = new TtsEngines(fragment.getPreferenceScreen().getContext());
44     }
45 
onCreate()46     public void onCreate() {
47         mParent = mFragment.getPreferenceScreen();
48         mVoiceCategory = (PreferenceCategory) mParent.findPreference(KEY_VOICE_CATEGORY);
49         mTtsSettingsPref = mVoiceCategory.findPreference(KEY_TTS_SETTINGS);
50 
51         populateOrRemovePreferences();
52     }
53 
populateOrRemovePreferences()54     private void populateOrRemovePreferences() {
55         boolean hasTtsPrefs = populateOrRemoveTtsPrefs();
56         if (!hasTtsPrefs) {
57             // There were no TTS settings and no recognizer settings,
58             // so it should be safe to hide the preference category
59             // entirely.
60             mFragment.getPreferenceScreen().removePreference(mVoiceCategory);
61         }
62     }
63 
populateOrRemoveTtsPrefs()64     private boolean populateOrRemoveTtsPrefs() {
65         if (mTtsEngines.getEngines().isEmpty()) {
66             mVoiceCategory.removePreference(mTtsSettingsPref);
67             return false;
68         }
69 
70         return true;
71     }
72 }
73