| /* |
| * Copyright (C) 2015 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 com.android.car.pm; |
| |
| import android.content.Context; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.PackageManager.NameNotFoundException; |
| import android.content.res.Resources; |
| import android.content.res.XmlResourceParser; |
| import android.util.Log; |
| |
| import com.android.car.CarLog; |
| |
| import java.io.IOException; |
| import java.util.LinkedList; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| /** |
| * Read meta data containing car application info. |
| */ |
| public class CarAppMetadataReader { |
| /** Name of the meta-data attribute for the automotive application XML resource */ |
| private static final String METADATA_ATTRIBUTE = "android.car.application"; |
| /** Name of the tag to declare automotive usage */ |
| private static final String USES_TAG = "uses"; |
| /** Name of the attribute to name the usage type */ |
| private static final String NAME_ATTRIBUTE = "name"; |
| |
| private static final String NAME_ATTR_TYPE_SERVICE = "service"; |
| private static final String NAME_ATTR_TYPE_ACTIVITY = "activity"; |
| |
| private static final String CLASS_ATTRIBUTE = "class"; |
| |
| public static CarAppMetadataInfo parseMetadata(Context context, String packageName) { |
| int metadataId = 0; |
| Resources resources = null; |
| try { |
| metadataId = getMetadataId(context, packageName); |
| if (metadataId == 0) { |
| return null; |
| } |
| PackageManager pm = context.getPackageManager(); |
| resources = pm.getResourcesForApplication(packageName); |
| } catch (NameNotFoundException e) { |
| Log.w(CarLog.TAG_PACKAGE, "Cannot read mta data, package:" + packageName, e); |
| return null; |
| } |
| |
| // Try to open the XML resource |
| XmlResourceParser parser = null; |
| try { |
| parser = resources.getXml(metadataId); |
| } catch (Resources.NotFoundException e) { |
| Log.w(CarLog.TAG_PACKAGE, "Resource not found [" + packageName + "]"); |
| return null; |
| } |
| |
| boolean useService = false; |
| boolean useAllActivities = false; |
| LinkedList<String> activities = null; |
| // Now, read the XML and pull out the appropriate "uses" attribute |
| int eventType; |
| try { |
| eventType = parser.next(); |
| while (eventType != XmlPullParser.END_DOCUMENT) { |
| if (eventType == XmlPullParser.START_TAG && USES_TAG.equals(parser.getName())) { |
| String nameAttribute = |
| parser.getAttributeValue(null /*namespace*/, NAME_ATTRIBUTE); |
| if (nameAttribute == null) { |
| Log.w(CarLog.TAG_PACKAGE, "Bad metadata," + METADATA_ATTRIBUTE + |
| " for pavkage:" + packageName); |
| return null; |
| } |
| switch (nameAttribute) { |
| case NAME_ATTR_TYPE_SERVICE: |
| useService = true; |
| break; |
| case NAME_ATTR_TYPE_ACTIVITY: { |
| String classAttribute = parser.getAttributeValue(null /*namespace*/, |
| CLASS_ATTRIBUTE); |
| if (classAttribute == null) { // all activities |
| useAllActivities = true; |
| } else { |
| if (activities == null) { |
| activities = new LinkedList<>(); |
| } |
| activities.add(classAttribute); |
| } |
| } break; |
| } |
| } |
| eventType = parser.next(); |
| } |
| } catch (XmlPullParserException | IOException e) { |
| Log.w(CarLog.TAG_PACKAGE, "Resource not parsable [" + packageName + "]"); |
| return null; |
| } |
| String[] activityStrings = null; |
| if (activities != null) { |
| activityStrings = activities.toArray(new String[activities.size()]); |
| } |
| return new CarAppMetadataInfo(useService, useAllActivities, activityStrings); |
| } |
| |
| /** |
| * Returns the resource ID of the automotive application XML |
| * @throws NameNotFoundException |
| */ |
| private static int getMetadataId(Context context, String packageName) |
| throws NameNotFoundException { |
| final PackageManager pm = context.getPackageManager(); |
| ApplicationInfo appInfo; |
| appInfo = pm.getApplicationInfo(packageName, PackageManager.GET_META_DATA /*flags*/); |
| if (appInfo.metaData == null) { |
| return 0; |
| } |
| return appInfo.metaData.getInt(METADATA_ATTRIBUTE, 0); |
| } |
| |
| /** |
| * App's metada for car application |
| */ |
| public static class CarAppMetadataInfo { |
| /** has "service" use */ |
| public final boolean useService; |
| /** has "activity" use with no specific class */ |
| public final boolean useAllActivities; |
| /** has "activity" uses with specific classes */ |
| public String[] activities; |
| |
| private CarAppMetadataInfo(boolean useService, boolean useAllActivities, |
| String[] activities) { |
| this.useService = useService; |
| this.useAllActivities = useAllActivities; |
| this.activities = activities; |
| } |
| } |
| } |