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      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 
     17 package com.android.quicksearchbox;
     18 
     19 import android.app.AlertDialog;
     20 import android.app.Dialog;
     21 import android.app.SearchManager;
     22 import android.content.Context;
     23 import android.content.DialogInterface;
     24 import android.content.Intent;
     25 import android.content.SharedPreferences;
     26 import android.content.pm.PackageManager;
     27 import android.content.pm.ResolveInfo;
     28 import android.database.ContentObserver;
     29 import android.os.Bundle;
     30 import android.preference.Preference;
     31 import android.preference.PreferenceActivity;
     32 import android.preference.PreferenceScreen;
     33 import android.preference.Preference.OnPreferenceClickListener;
     34 import android.provider.Settings;
     35 import android.provider.Settings.System;
     36 import android.util.Log;
     37 import android.view.Menu;
     38 
     39 import java.util.List;
     40 
     41 /**
     42  * Activity for setting global search preferences.
     43  */
     44 public class SearchSettings extends PreferenceActivity
     45         implements OnPreferenceClickListener {
     46 
     47     private static final boolean DBG = false;
     48     private static final String TAG = "SearchSettings";
     49 
     50     // Name of the preferences file used to store search preference
     51     public static final String PREFERENCES_NAME = "SearchSettings";
     52 
     53     // Intent action that opens the "Searchable Items" preference
     54     public static final String ACTION_SEARCHABLE_ITEMS =
     55             "com.android.quicksearchbox.action.SEARCHABLE_ITEMS";
     56 
     57     // Only used to find the preferences after inflating
     58     private static final String CLEAR_SHORTCUTS_PREF = "clear_shortcuts";
     59     private static final String SEARCH_ENGINE_SETTINGS_PREF = "search_engine_settings";
     60     private static final String SEARCH_CORPORA_PREF = "search_corpora";
     61 
     62     // Prefix of per-corpus enable preference
     63     private static final String CORPUS_ENABLED_PREF_PREFIX = "enable_corpus_";
     64 
     65     // References to the top-level preference objects
     66     private Preference mClearShortcutsPreference;
     67     private PreferenceScreen mSearchEngineSettingsPreference;
     68 
     69     // Dialog ids
     70     private static final int CLEAR_SHORTCUTS_CONFIRM_DIALOG = 0;
     71 
     72     @Override
     73     protected void onCreate(Bundle savedInstanceState) {
     74         super.onCreate(savedInstanceState);
     75 
     76         getPreferenceManager().setSharedPreferencesName(PREFERENCES_NAME);
     77 
     78         addPreferencesFromResource(R.xml.preferences);
     79 
     80         PreferenceScreen preferenceScreen = getPreferenceScreen();
     81         mClearShortcutsPreference = preferenceScreen.findPreference(CLEAR_SHORTCUTS_PREF);
     82         mSearchEngineSettingsPreference = (PreferenceScreen) preferenceScreen.findPreference(
     83                 SEARCH_ENGINE_SETTINGS_PREF);
     84         Preference corporaPreference = preferenceScreen.findPreference(SEARCH_CORPORA_PREF);
     85         corporaPreference.setIntent(getSearchableItemsIntent(this));
     86 
     87         mClearShortcutsPreference.setOnPreferenceClickListener(this);
     88 
     89         updateClearShortcutsPreference();
     90         populateSearchEnginePreference();
     91     }
     92 
     93     public static Intent getSearchableItemsIntent(Context context) {
     94         Intent intent = new Intent(SearchSettings.ACTION_SEARCHABLE_ITEMS);
     95         intent.setPackage(context.getPackageName());
     96         return intent;
     97     }
     98 
     99     /**
    100      * Gets the preference key of the preference for whether the given corpus
    101      * is enabled. The preference is stored in the {@link #PREFERENCES_NAME}
    102      * preferences file.
    103      */
    104     public static String getCorpusEnabledPreference(Corpus corpus) {
    105         return CORPUS_ENABLED_PREF_PREFIX + corpus.getName();
    106     }
    107 
    108     public static SharedPreferences getSearchPreferences(Context context) {
    109         return context.getSharedPreferences(PREFERENCES_NAME, Context.MODE_PRIVATE);
    110     }
    111 
    112     private ShortcutRepository getShortcuts() {
    113         return QsbApplication.get(this).getShortcutRepository();
    114     }
    115 
    116     private Config getConfig() {
    117         return QsbApplication.get(this).getConfig();
    118     }
    119 
    120     /**
    121      * Enables/disables the "Clear search shortcuts" preference depending
    122      * on whether there is any search history.
    123      */
    124     private void updateClearShortcutsPreference() {
    125         boolean hasHistory = getShortcuts().hasHistory();
    126         if (DBG) Log.d(TAG, "hasHistory()=" + hasHistory);
    127         mClearShortcutsPreference.setEnabled(hasHistory);
    128     }
    129 
    130     /**
    131      * Populates the preference item for the web search engine, which links to further
    132      * search settings.
    133      */
    134     private void populateSearchEnginePreference() {
    135         Intent intent = new Intent(SearchManager.INTENT_ACTION_WEB_SEARCH_SETTINGS);
    136         intent.setPackage(getPackageName());
    137 
    138         CharSequence webSearchSettingsLabel = getActivityLabel(intent);
    139         mSearchEngineSettingsPreference.setTitle(webSearchSettingsLabel);
    140         mSearchEngineSettingsPreference.setIntent(intent);
    141     }
    142 
    143     private CharSequence getActivityLabel(Intent intent) {
    144         PackageManager pm = getPackageManager();
    145         List<ResolveInfo> resolveInfos = pm.queryIntentActivities(intent, 0);
    146         if (resolveInfos.size() == 0) {
    147             Log.e(TAG, "No web search settings activity");
    148             return null;
    149         }
    150         if (resolveInfos.size() > 1) {
    151             Log.e(TAG, "More than one web search settings activity");
    152             return null;
    153         }
    154         return resolveInfos.get(0).activityInfo.loadLabel(pm);
    155     }
    156 
    157     public synchronized boolean onPreferenceClick(Preference preference) {
    158         if (preference == mClearShortcutsPreference) {
    159             showDialog(CLEAR_SHORTCUTS_CONFIRM_DIALOG);
    160             return true;
    161         }
    162         return false;
    163     }
    164 
    165     @Override
    166     protected Dialog onCreateDialog(int id, Bundle args) {
    167         switch (id) {
    168             case CLEAR_SHORTCUTS_CONFIRM_DIALOG:
    169                 return new AlertDialog.Builder(this)
    170                         .setTitle(R.string.clear_shortcuts)
    171                         .setMessage(R.string.clear_shortcuts_prompt)
    172                         .setPositiveButton(R.string.agree, new DialogInterface.OnClickListener() {
    173                             public void onClick(DialogInterface dialog, int whichButton) {
    174                                 if (DBG) Log.d(TAG, "Clearing history...");
    175                                 getShortcuts().clearHistory();
    176                                 mClearShortcutsPreference.setEnabled(false);
    177                             }
    178                         })
    179                         .setNegativeButton(R.string.disagree, null).create();
    180             default:
    181                 Log.e(TAG, "unknown dialog" + id);
    182                 return null;
    183         }
    184     }
    185 
    186     /**
    187      * Informs our listeners about the updated settings data.
    188      */
    189     public static void broadcastSettingsChanged(Context context) {
    190         // We use a message broadcast since the listeners could be in multiple processes.
    191         Intent intent = new Intent(SearchManager.INTENT_ACTION_SEARCH_SETTINGS_CHANGED);
    192         Log.i(TAG, "Broadcasting: " + intent);
    193         context.sendBroadcast(intent);
    194     }
    195 
    196     public static boolean getShowWebSuggestions(Context context) {
    197         return (Settings.System.getInt(context.getContentResolver(),
    198                 Settings.System.SHOW_WEB_SUGGESTIONS,
    199                 1 /* default on until user actually changes it */) == 1);
    200     }
    201 
    202     public static void setShowWebSuggestions(Context context, boolean showWebSuggestions) {
    203         System.putInt(context.getContentResolver(), System.SHOW_WEB_SUGGESTIONS,
    204             showWebSuggestions ? 1 : 0);
    205     }
    206 
    207     public static void registerShowWebSuggestionsSettingObserver(
    208             Context context, ContentObserver observer) {
    209         context.getContentResolver().registerContentObserver(
    210                 Settings.System.getUriFor(Settings.System.SHOW_WEB_SUGGESTIONS),
    211                 false, observer);
    212     }
    213 
    214     public static void unregisterShowWebSuggestionsSettingObserver(
    215             Context context, ContentObserver observer) {
    216         context.getContentResolver().unregisterContentObserver(observer);
    217     }
    218 
    219     public static void addSearchSettingsMenuItem(Context context, Menu menu) {
    220         Intent settings = new Intent(SearchManager.INTENT_ACTION_SEARCH_SETTINGS);
    221         settings.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
    222         // Don't show activity chooser if there are multiple search settings activities,
    223         // e.g. from different QSB implementations.
    224         settings.setPackage(context.getPackageName());
    225         menu.add(Menu.NONE, Menu.NONE, 0, R.string.menu_settings)
    226                 .setIcon(R.drawable.ic_menu_preferences).setAlphabeticShortcut('P')
    227                 .setIntent(settings);
    228     }
    229 }
    230