RecentsTaskLoadPlan.java revision 96d704186621f6310e0e7d39db57caff67baa96c 
1/*
2 * Copyright (C) 2014 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
17package com.android.systemui.recents.model;
18
19import android.app.ActivityManager;
20import android.content.Context;
21import android.content.res.Resources;
22import android.graphics.Bitmap;
23import android.graphics.drawable.Drawable;
24import android.os.UserHandle;
25import android.util.Log;
26import com.android.systemui.recents.RecentsConfiguration;
27import com.android.systemui.recents.misc.SystemServicesProxy;
28
29import java.util.ArrayList;
30import java.util.Collections;
31import java.util.HashMap;
32import java.util.List;
33
34
35/**
36 * This class stores the loading state as it goes through multiple stages of loading:
37 *   - preloadRawTasks() will load the raw set of recents tasks from the system
38 *   - preloadPlan() will construct a new task stack with all metadata and only icons and thumbnails
39 *     that are currently in the cache
40 *   - executePlan() will actually load and fill in the icons and thumbnails according to the load
41 *     options specified, such that we can transition into the Recents activity seamlessly
42 */
43public class RecentsTaskLoadPlan {
44    static String TAG = "RecentsTaskLoadPlan";
45    static boolean DEBUG = false;
46
47    /** The set of conditions to load tasks. */
48    public static class Options {
49        public int runningTaskId = -1;
50        public boolean loadIcons = true;
51        public boolean loadThumbnails = true;
52        public boolean onlyLoadForCache = false;
53        public int numVisibleTasks = 0;
54        public int numVisibleTaskThumbnails = 0;
55    }
56
57    Context mContext;
58    RecentsConfiguration mConfig;
59    SystemServicesProxy mSystemServicesProxy;
60
61    List<ActivityManager.RecentTaskInfo> mRawTasks;
62    TaskStack mStack;
63    HashMap<Task.ComponentNameKey, ActivityInfoHandle> mActivityInfoCache =
64            new HashMap<Task.ComponentNameKey, ActivityInfoHandle>();
65
66    /** Package level ctor */
67    RecentsTaskLoadPlan(Context context, RecentsConfiguration config, SystemServicesProxy ssp) {
68        mContext = context;
69        mConfig = config;
70        mSystemServicesProxy = ssp;
71    }
72
73    /**
74     * An optimization to preload the raw list of tasks.
75     */
76    public synchronized void preloadRawTasks(boolean isTopTaskHome) {
77        mRawTasks = mSystemServicesProxy.getRecentTasks(mConfig.maxNumTasksToLoad,
78                UserHandle.CURRENT.getIdentifier(), isTopTaskHome);
79        Collections.reverse(mRawTasks);
80
81        if (DEBUG) Log.d(TAG, "preloadRawTasks, tasks: " + mRawTasks.size());
82    }
83
84    /**
85     * Preloads the list of recent tasks from the system.  After this call, the TaskStack will
86     * have a list of all the recent tasks with their metadata, not including icons or
87     * thumbnails which were not cached and have to be loaded.
88     */
89    synchronized void preloadPlan(RecentsTaskLoader loader, boolean isTopTaskHome) {
90        if (DEBUG) Log.d(TAG, "preloadPlan");
91
92        mActivityInfoCache.clear();
93        mStack = new TaskStack();
94
95        Resources res = mContext.getResources();
96        ArrayList<Task> loadedTasks = new ArrayList<Task>();
97        if (mRawTasks == null) {
98            preloadRawTasks(isTopTaskHome);
99        }
100        int taskCount = mRawTasks.size();
101        for (int i = 0; i < taskCount; i++) {
102            ActivityManager.RecentTaskInfo t = mRawTasks.get(i);
103
104            // Compose the task key
105            Task.TaskKey taskKey = new Task.TaskKey(t.persistentId, t.baseIntent, t.userId,
106                    t.firstActiveTime, t.lastActiveTime);
107
108            // Get an existing activity info handle if possible
109            Task.ComponentNameKey cnKey = taskKey.getComponentNameKey();
110            ActivityInfoHandle infoHandle;
111            boolean hadCachedActivityInfo = false;
112            if (mActivityInfoCache.containsKey(cnKey)) {
113                infoHandle = mActivityInfoCache.get(cnKey);
114                hadCachedActivityInfo = true;
115            } else {
116                infoHandle = new ActivityInfoHandle();
117            }
118
119            // Load the label, icon, and color
120            String activityLabel = loader.getAndUpdateActivityLabel(taskKey, t.taskDescription,
121                    mSystemServicesProxy, infoHandle);
122            Drawable activityIcon = loader.getAndUpdateActivityIcon(taskKey, t.taskDescription,
123                    mSystemServicesProxy, res, infoHandle, false);
124            int activityColor = loader.getActivityPrimaryColor(t.taskDescription, mConfig);
125
126            // Update the activity info cache
127            if (!hadCachedActivityInfo && infoHandle.info != null) {
128                mActivityInfoCache.put(cnKey, infoHandle);
129            }
130
131            Bitmap icon = t.taskDescription != null
132                    ? t.taskDescription.getInMemoryIcon()
133                    : null;
134            String iconFilename = t.taskDescription != null
135                    ? t.taskDescription.getIconFilename()
136                    : null;
137
138            // Add the task to the stack
139            Task task = new Task(taskKey, (t.id != RecentsTaskLoader.INVALID_TASK_ID),
140                    t.affiliatedTaskId, t.affiliatedTaskColor, activityLabel, activityIcon,
141                    activityColor, (i == (taskCount - 1)), mConfig.lockToAppEnabled, icon,
142                    iconFilename);
143            task.thumbnail = loader.getAndUpdateThumbnail(taskKey, mSystemServicesProxy, false);
144            loadedTasks.add(task);
145        }
146        mStack.setTasks(loadedTasks);
147        mStack.createAffiliatedGroupings(mConfig);
148
149        // Assertion
150        if (mStack.getTaskCount() != mRawTasks.size()) {
151            throw new RuntimeException("Loading failed");
152        }
153    }
154
155    /**
156     * Called to apply the actual loading based on the specified conditions.
157     */
158    synchronized void executePlan(Options opts, RecentsTaskLoader loader,
159            TaskResourceLoadQueue loadQueue) {
160        if (DEBUG) Log.d(TAG, "executePlan, # tasks: " + opts.numVisibleTasks +
161                ", # thumbnails: " + opts.numVisibleTaskThumbnails +
162                ", running task id: " + opts.runningTaskId);
163
164        Resources res = mContext.getResources();
165
166        // Iterate through each of the tasks and load them according to the load conditions.
167        ArrayList<Task> tasks = mStack.getTasks();
168        int taskCount = tasks.size();
169        for (int i = 0; i < taskCount; i++) {
170            ActivityManager.RecentTaskInfo t = mRawTasks.get(i);
171            Task task = tasks.get(i);
172            Task.TaskKey taskKey = task.key;
173
174            // Get an existing activity info handle if possible
175            Task.ComponentNameKey cnKey = taskKey.getComponentNameKey();
176            ActivityInfoHandle infoHandle;
177            boolean hadCachedActivityInfo = false;
178            if (mActivityInfoCache.containsKey(cnKey)) {
179                infoHandle = mActivityInfoCache.get(cnKey);
180                hadCachedActivityInfo = true;
181            } else {
182                infoHandle = new ActivityInfoHandle();
183            }
184
185            boolean isRunningTask = (task.key.id == opts.runningTaskId);
186            boolean isVisibleTask = i >= (taskCount - opts.numVisibleTasks);
187            boolean isVisibleThumbnail = i >= (taskCount - opts.numVisibleTaskThumbnails);
188
189            if (opts.loadIcons && (isRunningTask || isVisibleTask)) {
190                if (task.activityIcon == null) {
191                    if (DEBUG) Log.d(TAG, "\tLoading icon: " + taskKey);
192                    task.activityIcon = loader.getAndUpdateActivityIcon(taskKey, t.taskDescription,
193                            mSystemServicesProxy, res, infoHandle, true);
194                }
195            }
196            if (opts.loadThumbnails && (isRunningTask || isVisibleThumbnail)) {
197                if (task.thumbnail == null) {
198                    if (DEBUG) Log.d(TAG, "\tLoading thumbnail: " + taskKey);
199                    if (mConfig.svelteLevel <= RecentsConfiguration.SVELTE_LIMIT_CACHE) {
200                        task.thumbnail = loader.getAndUpdateThumbnail(taskKey, mSystemServicesProxy,
201                                true);
202                    } else if (mConfig.svelteLevel == RecentsConfiguration.SVELTE_DISABLE_CACHE) {
203                        loadQueue.addTask(task);
204                    }
205                }
206            }
207
208            // Update the activity info cache
209            if (!hadCachedActivityInfo && infoHandle.info != null) {
210                mActivityInfoCache.put(cnKey, infoHandle);
211            }
212        }
213    }
214
215    /**
216     * Composes and returns a TaskStack from the preloaded list of recent tasks.
217     */
218    public TaskStack getTaskStack() {
219        return mStack;
220    }
221
222    /**
223     * Composes and returns a SpaceNode from the preloaded list of recent tasks.
224     */
225    public SpaceNode getSpaceNode() {
226        SpaceNode node = new SpaceNode();
227        node.setStack(mStack);
228        return node;
229    }
230}
231