| /* |
| * Copyright (C) 2020 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.launcher3.model; |
| |
| import static com.android.launcher3.util.Executors.MODEL_EXECUTOR; |
| |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.SharedPreferences; |
| import android.os.UserHandle; |
| |
| import androidx.annotation.AnyThread; |
| import androidx.annotation.WorkerThread; |
| |
| import com.android.launcher3.LauncherAppState; |
| import com.android.launcher3.R; |
| import com.android.launcher3.Utilities; |
| import com.android.launcher3.pm.UserCache; |
| import com.android.launcher3.util.ComponentKey; |
| import com.android.launcher3.util.Preconditions; |
| import com.android.launcher3.util.ResourceBasedOverride; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Model Helper for app predictions |
| */ |
| public class PredictionModel implements ResourceBasedOverride { |
| |
| private static final String CACHED_ITEMS_KEY = "predicted_item_keys"; |
| private static final int MAX_CACHE_ITEMS = 5; |
| |
| protected Context mContext; |
| private SharedPreferences mDevicePrefs; |
| private UserCache mUserCache; |
| |
| |
| /** |
| * Retrieve instance of this object that can be overridden in runtime based on the build |
| * variant of the application. |
| */ |
| public static PredictionModel newInstance(Context context) { |
| PredictionModel model = Overrides.getObject(PredictionModel.class, context, |
| R.string.prediction_model_class); |
| model.init(context); |
| return model; |
| } |
| |
| protected void init(Context context) { |
| mContext = context; |
| mDevicePrefs = Utilities.getDevicePrefs(mContext); |
| mUserCache = UserCache.INSTANCE.get(mContext); |
| |
| } |
| |
| /** |
| * Formats and stores a list of component key in device preferences. |
| */ |
| @AnyThread |
| public void cachePredictionComponentKeys(List<ComponentKey> componentKeys) { |
| MODEL_EXECUTOR.execute(() -> { |
| LauncherAppState appState = LauncherAppState.getInstance(mContext); |
| StringBuilder builder = new StringBuilder(); |
| int count = Math.min(componentKeys.size(), MAX_CACHE_ITEMS); |
| for (int i = 0; i < count; i++) { |
| builder.append(serializeComponentKeyToString(componentKeys.get(i))); |
| builder.append("\n"); |
| } |
| if (componentKeys.isEmpty() /* should invalidate loader items */) { |
| appState.getModel().enqueueModelUpdateTask(new BaseModelUpdateTask() { |
| @Override |
| public void execute(LauncherAppState app, BgDataModel model, AllAppsList apps) { |
| model.cachedPredictedItems.clear(); |
| } |
| }); |
| } |
| mDevicePrefs.edit().putString(CACHED_ITEMS_KEY, builder.toString()).apply(); |
| }); |
| } |
| |
| /** |
| * parses and returns ComponentKeys saved by |
| * {@link PredictionModel#cachePredictionComponentKeys(List)} |
| */ |
| @WorkerThread |
| public List<ComponentKey> getPredictionComponentKeys() { |
| Preconditions.assertWorkerThread(); |
| ArrayList<ComponentKey> items = new ArrayList<>(); |
| String cachedBlob = mDevicePrefs.getString(CACHED_ITEMS_KEY, ""); |
| for (String line : cachedBlob.split("\n")) { |
| ComponentKey key = getComponentKeyFromSerializedString(line); |
| if (key != null) { |
| items.add(key); |
| } |
| |
| } |
| return items; |
| } |
| |
| private String serializeComponentKeyToString(ComponentKey componentKey) { |
| long userSerialNumber = mUserCache.getSerialNumberForUser(componentKey.user); |
| return componentKey.componentName.flattenToString() + "#" + userSerialNumber; |
| } |
| |
| private ComponentKey getComponentKeyFromSerializedString(String str) { |
| int sep = str.indexOf('#'); |
| if (sep < 0 || (sep + 1) >= str.length()) { |
| return null; |
| } |
| ComponentName componentName = ComponentName.unflattenFromString(str.substring(0, sep)); |
| if (componentName == null) { |
| return null; |
| } |
| try { |
| long serialNumber = Long.parseLong(str.substring(sep + 1)); |
| UserHandle userHandle = mUserCache.getUserForSerialNumber(serialNumber); |
| return userHandle != null ? new ComponentKey(componentName, userHandle) : null; |
| } catch (NumberFormatException ex) { |
| return null; |
| } |
| } |
| } |