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      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 
     17 package com.android.systemui.recents.model;
     18 
     19 import android.content.ComponentName;
     20 import android.content.Context;
     21 import android.os.Looper;
     22 import android.os.UserHandle;
     23 import com.android.internal.content.PackageMonitor;
     24 import com.android.systemui.recents.misc.SystemServicesProxy;
     25 
     26 import java.util.HashSet;
     27 import java.util.List;
     28 
     29 /**
     30  * The package monitor listens for changes from PackageManager to update the contents of the
     31  * Recents list.
     32  */
     33 public class RecentsPackageMonitor extends PackageMonitor {
     34     public interface PackageCallbacks {
     35         public void onPackagesChanged(RecentsPackageMonitor monitor, String packageName,
     36                                       int userId);
     37     }
     38 
     39     PackageCallbacks mCb;
     40     SystemServicesProxy mSystemServicesProxy;
     41 
     42     /** Registers the broadcast receivers with the specified callbacks. */
     43     public void register(Context context, PackageCallbacks cb) {
     44         mSystemServicesProxy = new SystemServicesProxy(context);
     45         mCb = cb;
     46         try {
     47             // We register for events from all users, but will cross-reference them with
     48             // packages for the current user and any profiles they have
     49             register(context, Looper.getMainLooper(), UserHandle.ALL, true);
     50         } catch (IllegalStateException e) {
     51             e.printStackTrace();
     52         }
     53     }
     54 
     55     /** Unregisters the broadcast receivers. */
     56     @Override
     57     public void unregister() {
     58         try {
     59             super.unregister();
     60         } catch (IllegalStateException e) {
     61             e.printStackTrace();
     62         }
     63         mSystemServicesProxy = null;
     64         mCb = null;
     65     }
     66 
     67     @Override
     68     public void onPackageRemoved(String packageName, int uid) {
     69         if (mCb == null) return;
     70 
     71         // Notify callbacks that a package has changed
     72         final int eventUserId = getChangingUserId();
     73         mCb.onPackagesChanged(this, packageName, eventUserId);
     74     }
     75 
     76     @Override
     77     public boolean onPackageChanged(String packageName, int uid, String[] components) {
     78         onPackageModified(packageName);
     79         return true;
     80     }
     81 
     82     @Override
     83     public void onPackageModified(String packageName) {
     84         if (mCb == null) return;
     85 
     86         // Notify callbacks that a package has changed
     87         final int eventUserId = getChangingUserId();
     88         mCb.onPackagesChanged(this, packageName, eventUserId);
     89     }
     90 
     91     /**
     92      * Computes the components that have been removed as a result of a change in the specified
     93      * package.
     94      */
     95     public HashSet<ComponentName> computeComponentsRemoved(List<Task.TaskKey> taskKeys,
     96             String packageName, int userId) {
     97         // Identify all the tasks that should be removed as a result of the package being removed.
     98         // Using a set to ensure that we callback once per unique component.
     99         HashSet<ComponentName> existingComponents = new HashSet<ComponentName>();
    100         HashSet<ComponentName> removedComponents = new HashSet<ComponentName>();
    101         for (Task.TaskKey t : taskKeys) {
    102             // Skip if this doesn't apply to the current user
    103             if (t.userId != userId) continue;
    104 
    105             ComponentName cn = t.baseIntent.getComponent();
    106             if (cn.getPackageName().equals(packageName)) {
    107                 if (existingComponents.contains(cn)) {
    108                     // If we know that the component still exists in the package, then skip
    109                     continue;
    110                 }
    111                 if (mSystemServicesProxy.getActivityInfo(cn, userId) != null) {
    112                     existingComponents.add(cn);
    113                 } else {
    114                     removedComponents.add(cn);
    115                 }
    116             }
    117         }
    118         return removedComponents;
    119     }
    120 }
    121