| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.server.search; |
| |
| import android.app.SearchManager; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.ActivityInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.ResolveInfo; |
| import android.os.Bundle; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| |
| /** |
| * This class maintains the information about all searchable activities. |
| */ |
| public class Searchables { |
| |
| // static strings used for XML lookups, etc. |
| // TODO how should these be documented for the developer, in a more structured way than |
| // the current long wordy javadoc in SearchManager.java ? |
| private static final String MD_LABEL_DEFAULT_SEARCHABLE = "android.app.default_searchable"; |
| private static final String MD_SEARCHABLE_SYSTEM_SEARCH = "*"; |
| |
| private Context mContext; |
| |
| private HashMap<ComponentName, SearchableInfo> mSearchablesMap = null; |
| private ArrayList<SearchableInfo> mSearchablesList = null; |
| private ArrayList<SearchableInfo> mSearchablesInGlobalSearchList = null; |
| private SearchableInfo mDefaultSearchable = null; |
| |
| /** |
| * |
| * @param context Context to use for looking up activities etc. |
| */ |
| public Searchables (Context context) { |
| mContext = context; |
| } |
| |
| /** |
| * Look up, or construct, based on the activity. |
| * |
| * The activities fall into three cases, based on meta-data found in |
| * the manifest entry: |
| * <ol> |
| * <li>The activity itself implements search. This is indicated by the |
| * presence of a "android.app.searchable" meta-data attribute. |
| * The value is a reference to an XML file containing search information.</li> |
| * <li>A related activity implements search. This is indicated by the |
| * presence of a "android.app.default_searchable" meta-data attribute. |
| * The value is a string naming the activity implementing search. In this |
| * case the factory will "redirect" and return the searchable data.</li> |
| * <li>No searchability data is provided. We return null here and other |
| * code will insert the "default" (e.g. contacts) search. |
| * |
| * TODO: cache the result in the map, and check the map first. |
| * TODO: it might make sense to implement the searchable reference as |
| * an application meta-data entry. This way we don't have to pepper each |
| * and every activity. |
| * TODO: can we skip the constructor step if it's a non-searchable? |
| * TODO: does it make sense to plug the default into a slot here for |
| * automatic return? Probably not, but it's one way to do it. |
| * |
| * @param activity The name of the current activity, or null if the |
| * activity does not define any explicit searchable metadata. |
| */ |
| public SearchableInfo getSearchableInfo(ComponentName activity) { |
| // Step 1. Is the result already hashed? (case 1) |
| SearchableInfo result; |
| synchronized (this) { |
| result = mSearchablesMap.get(activity); |
| if (result != null) return result; |
| } |
| |
| // Step 2. See if the current activity references a searchable. |
| // Note: Conceptually, this could be a while(true) loop, but there's |
| // no point in implementing reference chaining here and risking a loop. |
| // References must point directly to searchable activities. |
| |
| ActivityInfo ai = null; |
| try { |
| ai = mContext.getPackageManager(). |
| getActivityInfo(activity, PackageManager.GET_META_DATA ); |
| String refActivityName = null; |
| |
| // First look for activity-specific reference |
| Bundle md = ai.metaData; |
| if (md != null) { |
| refActivityName = md.getString(MD_LABEL_DEFAULT_SEARCHABLE); |
| } |
| // If not found, try for app-wide reference |
| if (refActivityName == null) { |
| md = ai.applicationInfo.metaData; |
| if (md != null) { |
| refActivityName = md.getString(MD_LABEL_DEFAULT_SEARCHABLE); |
| } |
| } |
| |
| // Irrespective of source, if a reference was found, follow it. |
| if (refActivityName != null) |
| { |
| // An app or activity can declare that we should simply launch |
| // "system default search" if search is invoked. |
| if (refActivityName.equals(MD_SEARCHABLE_SYSTEM_SEARCH)) { |
| return getDefaultSearchable(); |
| } |
| String pkg = activity.getPackageName(); |
| ComponentName referredActivity; |
| if (refActivityName.charAt(0) == '.') { |
| referredActivity = new ComponentName(pkg, pkg + refActivityName); |
| } else { |
| referredActivity = new ComponentName(pkg, refActivityName); |
| } |
| |
| // Now try the referred activity, and if found, cache |
| // it against the original name so we can skip the check |
| synchronized (this) { |
| result = mSearchablesMap.get(referredActivity); |
| if (result != null) { |
| mSearchablesMap.put(activity, result); |
| return result; |
| } |
| } |
| } |
| } catch (PackageManager.NameNotFoundException e) { |
| // case 3: no metadata |
| } |
| |
| // Step 3. None found. Return null. |
| return null; |
| |
| } |
| |
| /** |
| * Provides the system-default search activity, which you can use |
| * whenever getSearchableInfo() returns null; |
| * |
| * @return Returns the system-default search activity, null if never defined |
| */ |
| public synchronized SearchableInfo getDefaultSearchable() { |
| return mDefaultSearchable; |
| } |
| |
| public synchronized boolean isDefaultSearchable(SearchableInfo searchable) { |
| return searchable == mDefaultSearchable; |
| } |
| |
| /** |
| * Builds an entire list (suitable for display) of |
| * activities that are searchable, by iterating the entire set of |
| * ACTION_SEARCH intents. |
| * |
| * Also clears the hash of all activities -> searches which will |
| * refill as the user clicks "search". |
| * |
| * This should only be done at startup and again if we know that the |
| * list has changed. |
| * |
| * TODO: every activity that provides a ACTION_SEARCH intent should |
| * also provide searchability meta-data. There are a bunch of checks here |
| * that, if data is not found, silently skip to the next activity. This |
| * won't help a developer trying to figure out why their activity isn't |
| * showing up in the list, but an exception here is too rough. I would |
| * like to find a better notification mechanism. |
| * |
| * TODO: sort the list somehow? UI choice. |
| */ |
| public void buildSearchableList() { |
| |
| // These will become the new values at the end of the method |
| HashMap<ComponentName, SearchableInfo> newSearchablesMap |
| = new HashMap<ComponentName, SearchableInfo>(); |
| ArrayList<SearchableInfo> newSearchablesList |
| = new ArrayList<SearchableInfo>(); |
| ArrayList<SearchableInfo> newSearchablesInGlobalSearchList |
| = new ArrayList<SearchableInfo>(); |
| |
| final PackageManager pm = mContext.getPackageManager(); |
| |
| // use intent resolver to generate list of ACTION_SEARCH receivers |
| List<ResolveInfo> infoList; |
| final Intent intent = new Intent(Intent.ACTION_SEARCH); |
| infoList = pm.queryIntentActivities(intent, PackageManager.GET_META_DATA); |
| |
| // analyze each one, generate a Searchables record, and record |
| if (infoList != null) { |
| int count = infoList.size(); |
| for (int ii = 0; ii < count; ii++) { |
| // for each component, try to find metadata |
| ResolveInfo info = infoList.get(ii); |
| ActivityInfo ai = info.activityInfo; |
| SearchableInfo searchable = SearchableInfo.getActivityMetaData(mContext, ai); |
| if (searchable != null) { |
| newSearchablesList.add(searchable); |
| newSearchablesMap.put(searchable.getSearchActivity(), searchable); |
| if (searchable.shouldIncludeInGlobalSearch()) { |
| newSearchablesInGlobalSearchList.add(searchable); |
| } |
| } |
| } |
| } |
| |
| // Find the global search provider |
| Intent globalSearchIntent = new Intent(SearchManager.INTENT_ACTION_GLOBAL_SEARCH); |
| ComponentName globalSearchActivity = globalSearchIntent.resolveActivity(pm); |
| SearchableInfo newDefaultSearchable = newSearchablesMap.get(globalSearchActivity); |
| |
| // Store a consistent set of new values |
| synchronized (this) { |
| mSearchablesMap = newSearchablesMap; |
| mSearchablesList = newSearchablesList; |
| mSearchablesInGlobalSearchList = newSearchablesInGlobalSearchList; |
| mDefaultSearchable = newDefaultSearchable; |
| } |
| } |
| |
| /** |
| * Returns the list of searchable activities. |
| */ |
| public synchronized ArrayList<SearchableInfo> getSearchablesList() { |
| ArrayList<SearchableInfo> result = new ArrayList<SearchableInfo>(mSearchablesList); |
| return result; |
| } |
| |
| /** |
| * Returns a list of the searchable activities that can be included in global search. |
| */ |
| public synchronized ArrayList<SearchableInfo> getSearchablesInGlobalSearchList() { |
| return new ArrayList<SearchableInfo>(mSearchablesInGlobalSearchList); |
| } |
| } |