| /* |
| * Copyright (C) 2018 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.tests.rollback.testapp; |
| |
| import android.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.res.Resources; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.util.Scanner; |
| |
| /** |
| * A broadcast reciever to check for and update user app data version |
| * compatibility. |
| */ |
| public class ProcessUserData extends BroadcastReceiver { |
| |
| private static final String TAG = "RollbackTestApp"; |
| |
| /** |
| * Exception thrown in case of issue with user data. |
| */ |
| public static class UserDataException extends Exception { |
| public UserDataException(String message) { |
| super(message); |
| } |
| |
| public UserDataException(String message, Throwable cause) { |
| super(message, cause); |
| } |
| } |
| |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| try { |
| processUserData(context); |
| setResultCode(1); |
| } catch (UserDataException e) { |
| setResultCode(0); |
| setResultData(e.getMessage()); |
| } |
| } |
| |
| /** |
| * Update the app's user data version to match the app version. |
| * |
| * @param context The application context. |
| * @throws UserDataException in case of problems with app user data. |
| */ |
| public void processUserData(Context context) throws UserDataException { |
| Resources res = context.getResources(); |
| String packageName = context.getPackageName(); |
| |
| int appVersionId = res.getIdentifier("app_version", "integer", packageName); |
| int appVersion = res.getInteger(appVersionId); |
| |
| int splitVersionId = res.getIdentifier("split_version", "integer", packageName); |
| int splitVersion = res.getInteger(splitVersionId); |
| |
| // Make sure the app version and split versions are compatible. |
| if (appVersion != splitVersion) { |
| throw new UserDataException("Split version " + splitVersion |
| + " does not match app version " + appVersion); |
| } |
| |
| // Read the version of the app's user data and ensure it is compatible |
| // with our version of the application. |
| File versionFile = new File(context.getFilesDir(), "version.txt"); |
| try { |
| Scanner s = new Scanner(versionFile); |
| int userDataVersion = s.nextInt(); |
| s.close(); |
| |
| if (userDataVersion > appVersion) { |
| throw new UserDataException("User data is from version " + userDataVersion |
| + ", which is not compatible with this version " + appVersion |
| + " of the RollbackTestApp"); |
| } |
| } catch (FileNotFoundException e) { |
| // No problem. This is a fresh install of the app or the user data |
| // has been wiped. |
| } |
| |
| // Record the current version of the app in the user data. |
| try { |
| PrintWriter pw = new PrintWriter(versionFile); |
| pw.println(appVersion); |
| pw.close(); |
| } catch (IOException e) { |
| throw new UserDataException("Unable to write user data.", e); |
| } |
| } |
| } |