1 /* 2 * Copyright (C) 2012 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.inputmethod.latin.utils; 18 19 import android.content.Context; 20 import android.content.pm.PackageInfo; 21 import android.content.pm.PackageManager; 22 import android.os.AsyncTask; 23 import android.util.LruCache; 24 25 import com.android.inputmethod.compat.AppWorkaroundsUtils; 26 27 public final class TargetPackageInfoGetterTask extends 28 AsyncTask<String, Void, PackageInfo> { 29 private static final int MAX_CACHE_ENTRIES = 64; // arbitrary 30 private static final LruCache<String, PackageInfo> sCache = new LruCache<>(MAX_CACHE_ENTRIES); 31 getCachedPackageInfo(final String packageName)32 public static PackageInfo getCachedPackageInfo(final String packageName) { 33 if (null == packageName) return null; 34 return sCache.get(packageName); 35 } 36 removeCachedPackageInfo(final String packageName)37 public static void removeCachedPackageInfo(final String packageName) { 38 sCache.remove(packageName); 39 } 40 41 private Context mContext; 42 private final AsyncResultHolder<AppWorkaroundsUtils> mResult; 43 TargetPackageInfoGetterTask(final Context context, final AsyncResultHolder<AppWorkaroundsUtils> result)44 public TargetPackageInfoGetterTask(final Context context, 45 final AsyncResultHolder<AppWorkaroundsUtils> result) { 46 mContext = context; 47 mResult = result; 48 } 49 50 @Override doInBackground(final String... packageName)51 protected PackageInfo doInBackground(final String... packageName) { 52 final PackageManager pm = mContext.getPackageManager(); 53 mContext = null; // Bazooka-powered anti-leak device 54 try { 55 final PackageInfo packageInfo = pm.getPackageInfo(packageName[0], 0 /* flags */); 56 sCache.put(packageName[0], packageInfo); 57 return packageInfo; 58 } catch (android.content.pm.PackageManager.NameNotFoundException e) { 59 return null; 60 } 61 } 62 63 @Override onPostExecute(final PackageInfo info)64 protected void onPostExecute(final PackageInfo info) { 65 mResult.set(new AppWorkaroundsUtils(info)); 66 } 67 } 68