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 public final class TargetPackageInfoGetterTask extends 26 AsyncTask<String, Void, PackageInfo> { 27 private static final int MAX_CACHE_ENTRIES = 64; // arbitrary 28 private static final LruCache<String, PackageInfo> sCache = 29 new LruCache<String, PackageInfo>(MAX_CACHE_ENTRIES); 30 31 public static PackageInfo getCachedPackageInfo(final String packageName) { 32 if (null == packageName) return null; 33 return sCache.get(packageName); 34 } 35 36 public static void removeCachedPackageInfo(final String packageName) { 37 sCache.remove(packageName); 38 } 39 40 public interface OnTargetPackageInfoKnownListener { 41 public void onTargetPackageInfoKnown(final PackageInfo info); 42 } 43 44 private Context mContext; 45 private final OnTargetPackageInfoKnownListener mListener; 46 47 public TargetPackageInfoGetterTask(final Context context, 48 final OnTargetPackageInfoKnownListener listener) { 49 mContext = context; 50 mListener = listener; 51 } 52 53 @Override 54 protected PackageInfo doInBackground(final String... packageName) { 55 final PackageManager pm = mContext.getPackageManager(); 56 mContext = null; // Bazooka-powered anti-leak device 57 try { 58 final PackageInfo packageInfo = pm.getPackageInfo(packageName[0], 0 /* flags */); 59 sCache.put(packageName[0], packageInfo); 60 return packageInfo; 61 } catch (android.content.pm.PackageManager.NameNotFoundException e) { 62 return null; 63 } 64 } 65 66 @Override 67 protected void onPostExecute(final PackageInfo info) { 68 mListener.onTargetPackageInfoKnown(info); 69 } 70 } 71
