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
17package com.android.settings;
18
19import android.content.ComponentName;
20import android.content.Intent;
21import android.content.pm.PackageManager;
22import android.content.pm.ResolveInfo;
23import android.content.pm.ServiceInfo;
24import android.content.pm.PackageManager.NameNotFoundException;
25import android.content.res.Resources;
26import android.content.res.TypedArray;
27import android.content.res.XmlResourceParser;
28import android.preference.ListPreference;
29import android.preference.Preference;
30import android.preference.PreferenceCategory;
31import android.preference.PreferenceGroup;
32import android.preference.PreferenceScreen;
33import android.preference.Preference.OnPreferenceChangeListener;
34import android.provider.Settings;
35import android.speech.RecognitionService;
36import android.speech.tts.TtsEngines;
37import android.util.AttributeSet;
38import android.util.Log;
39import android.util.Xml;
40
41import java.io.IOException;
42import java.util.HashMap;
43import java.util.List;
44
45import org.xmlpull.v1.XmlPullParser;
46import org.xmlpull.v1.XmlPullParserException;
47
48/**
49 * Settings screen for voice input/output.
50 */
51public class VoiceInputOutputSettings implements OnPreferenceChangeListener {
52
53    private static final String TAG = "VoiceInputOutputSettings";
54
55    private static final String KEY_VOICE_CATEGORY = "voice_category";
56    private static final String KEY_RECOGNIZER = "recognizer";
57    private static final String KEY_RECOGNIZER_SETTINGS = "recognizer_settings";
58    private static final String KEY_TTS_SETTINGS = "tts_settings";
59
60    private PreferenceGroup mParent;
61    private PreferenceCategory mVoiceCategory;
62    private ListPreference mRecognizerPref;
63    private Preference mRecognizerSettingsPref;
64    private Preference mTtsSettingsPref;
65    private PreferenceScreen mSettingsPref;
66    private final SettingsPreferenceFragment mFragment;
67    private final TtsEngines mTtsEngines;
68
69    private HashMap<String, ResolveInfo> mAvailableRecognizersMap;
70
71    public VoiceInputOutputSettings(SettingsPreferenceFragment fragment) {
72        mFragment = fragment;
73        mTtsEngines = new TtsEngines(fragment.getPreferenceScreen().getContext());
74    }
75
76    public void onCreate() {
77
78        mParent = mFragment.getPreferenceScreen();
79        mVoiceCategory = (PreferenceCategory) mParent.findPreference(KEY_VOICE_CATEGORY);
80        mRecognizerPref = (ListPreference) mVoiceCategory.findPreference(KEY_RECOGNIZER);
81        mRecognizerSettingsPref = mVoiceCategory.findPreference(KEY_RECOGNIZER_SETTINGS);
82        mTtsSettingsPref = mVoiceCategory.findPreference(KEY_TTS_SETTINGS);
83        mRecognizerPref.setOnPreferenceChangeListener(this);
84        mSettingsPref = (PreferenceScreen)
85                mVoiceCategory.findPreference(KEY_RECOGNIZER_SETTINGS);
86
87        mAvailableRecognizersMap = new HashMap<String, ResolveInfo>();
88
89        populateOrRemovePreferences();
90    }
91
92    private void populateOrRemovePreferences() {
93        boolean hasRecognizerPrefs = populateOrRemoveRecognizerPrefs();
94        boolean hasTtsPrefs = populateOrRemoveTtsPrefs();
95        if (!hasRecognizerPrefs && !hasTtsPrefs) {
96            // There were no TTS settings and no recognizer settings,
97            // so it should be safe to hide the preference category
98            // entirely.
99            mFragment.getPreferenceScreen().removePreference(mVoiceCategory);
100        }
101    }
102
103    private boolean populateOrRemoveRecognizerPrefs() {
104        List<ResolveInfo> availableRecognitionServices =
105                mFragment.getPackageManager().queryIntentServices(
106                        new Intent(RecognitionService.SERVICE_INTERFACE),
107                        PackageManager.GET_META_DATA);
108        int numAvailable = availableRecognitionServices.size();
109
110        if (numAvailable == 0) {
111            mVoiceCategory.removePreference(mRecognizerPref);
112            mVoiceCategory.removePreference(mRecognizerSettingsPref);
113            return false;
114        }
115
116        if (numAvailable == 1) {
117            // Only one recognizer available, so don't show the list of choices, but do
118            // set up the link to settings for the available recognizer.
119            mVoiceCategory.removePreference(mRecognizerPref);
120
121            // But first set up the available recognizers map with just the one recognizer.
122            ResolveInfo resolveInfo = availableRecognitionServices.get(0);
123            String recognizerComponent =
124                new ComponentName(resolveInfo.serviceInfo.packageName,
125                        resolveInfo.serviceInfo.name).flattenToShortString();
126
127            mAvailableRecognizersMap.put(recognizerComponent, resolveInfo);
128
129            String currentSetting = Settings.Secure.getString(
130                    mFragment.getContentResolver(), Settings.Secure.VOICE_RECOGNITION_SERVICE);
131            updateSettingsLink(currentSetting);
132        } else {
133            // Multiple recognizers available, so show the full list of choices.
134            populateRecognizerPreference(availableRecognitionServices);
135        }
136
137        // In this case, there was at least one available recognizer so
138        // we populated the settings.
139        return true;
140    }
141
142    private boolean populateOrRemoveTtsPrefs() {
143        if (mTtsEngines.getEngines().isEmpty()) {
144            mVoiceCategory.removePreference(mTtsSettingsPref);
145            return false;
146        }
147
148        return true;
149    }
150
151    private void populateRecognizerPreference(List<ResolveInfo> recognizers) {
152        int size = recognizers.size();
153        CharSequence[] entries = new CharSequence[size];
154        CharSequence[] values = new CharSequence[size];
155
156        // Get the current value from the secure setting.
157        String currentSetting = Settings.Secure.getString(
158                mFragment.getContentResolver(), Settings.Secure.VOICE_RECOGNITION_SERVICE);
159
160        // Iterate through all the available recognizers and load up their info to show
161        // in the preference. Also build up a map of recognizer component names to their
162        // ResolveInfos - we'll need that a little later.
163        for (int i = 0; i < size; i++) {
164            ResolveInfo resolveInfo = recognizers.get(i);
165            String recognizerComponent =
166                    new ComponentName(resolveInfo.serviceInfo.packageName,
167                            resolveInfo.serviceInfo.name).flattenToShortString();
168
169            mAvailableRecognizersMap.put(recognizerComponent, resolveInfo);
170
171            entries[i] = resolveInfo.loadLabel(mFragment.getPackageManager());
172            values[i] = recognizerComponent;
173        }
174
175        mRecognizerPref.setEntries(entries);
176        mRecognizerPref.setEntryValues(values);
177
178        mRecognizerPref.setDefaultValue(currentSetting);
179        mRecognizerPref.setValue(currentSetting);
180
181        updateSettingsLink(currentSetting);
182    }
183
184    private void updateSettingsLink(String currentSetting) {
185        ResolveInfo currentRecognizer = mAvailableRecognizersMap.get(currentSetting);
186        ServiceInfo si = currentRecognizer.serviceInfo;
187        XmlResourceParser parser = null;
188        String settingsActivity = null;
189        try {
190            parser = si.loadXmlMetaData(mFragment.getPackageManager(),
191                    RecognitionService.SERVICE_META_DATA);
192            if (parser == null) {
193                throw new XmlPullParserException("No " + RecognitionService.SERVICE_META_DATA +
194                        " meta-data for " + si.packageName);
195            }
196
197            Resources res = mFragment.getPackageManager().getResourcesForApplication(
198                    si.applicationInfo);
199
200            AttributeSet attrs = Xml.asAttributeSet(parser);
201
202            int type;
203            while ((type=parser.next()) != XmlPullParser.END_DOCUMENT
204                    && type != XmlPullParser.START_TAG) {
205            }
206
207            String nodeName = parser.getName();
208            if (!"recognition-service".equals(nodeName)) {
209                throw new XmlPullParserException(
210                        "Meta-data does not start with recognition-service tag");
211            }
212
213            TypedArray array = res.obtainAttributes(attrs,
214                    com.android.internal.R.styleable.RecognitionService);
215            settingsActivity = array.getString(
216                    com.android.internal.R.styleable.RecognitionService_settingsActivity);
217            array.recycle();
218        } catch (XmlPullParserException e) {
219            Log.e(TAG, "error parsing recognition service meta-data", e);
220        } catch (IOException e) {
221            Log.e(TAG, "error parsing recognition service meta-data", e);
222        } catch (NameNotFoundException e) {
223            Log.e(TAG, "error parsing recognition service meta-data", e);
224        } finally {
225            if (parser != null) parser.close();
226        }
227
228        if (settingsActivity == null) {
229            // No settings preference available - hide the preference.
230            Log.w(TAG, "no recognizer settings available for " + si.packageName);
231            mSettingsPref.setIntent(null);
232            mVoiceCategory.removePreference(mSettingsPref);
233        } else {
234            Intent i = new Intent(Intent.ACTION_MAIN);
235            i.setComponent(new ComponentName(si.packageName, settingsActivity));
236            mSettingsPref.setIntent(i);
237            mRecognizerPref.setSummary(currentRecognizer.loadLabel(mFragment.getPackageManager()));
238        }
239    }
240
241    public boolean onPreferenceChange(Preference preference, Object newValue) {
242        if (preference == mRecognizerPref) {
243            String setting = (String) newValue;
244
245            // Put the new value back into secure settings.
246            Settings.Secure.putString(mFragment.getContentResolver(),
247                    Settings.Secure.VOICE_RECOGNITION_SERVICE,
248                    setting);
249
250            // Update the settings item so it points to the right settings.
251            updateSettingsLink(setting);
252        }
253        return true;
254    }
255}
256