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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 com.android.internal.content.PackageMonitor;
     23 import com.android.systemui.recents.misc.SystemServicesProxy;
     24 
     25 import java.util.HashSet;
     26 import java.util.List;
     27 
     28 /**
     29  * The package monitor listens for changes from PackageManager to update the contents of the Recents
     30  * list.
     31  */
     32 public class RecentsPackageMonitor extends PackageMonitor {
     33     public interface PackageCallbacks {
     34         public void onComponentRemoved(HashSet<ComponentName> cns);
     35     }
     36 
     37     PackageCallbacks mCb;
     38     List<Task.TaskKey> mTasks;
     39     SystemServicesProxy mSystemServicesProxy;
     40 
     41     /** Registers the broadcast receivers with the specified callbacks. */
     42     public void register(Context context, PackageCallbacks cb) {
     43         mSystemServicesProxy = new SystemServicesProxy(context);
     44         mCb = cb;
     45         try {
     46             register(context, Looper.getMainLooper(), true);
     47         } catch (IllegalStateException e) {
     48             e.printStackTrace();
     49         }
     50     }
     51 
     52     /** Unregisters the broadcast receivers. */
     53     @Override
     54     public void unregister() {
     55         try {
     56             super.unregister();
     57         } catch (IllegalStateException e) {
     58             e.printStackTrace();
     59         }
     60         mSystemServicesProxy = null;
     61         mCb = null;
     62         mTasks.clear();
     63     }
     64 
     65     /** Sets the list of tasks to match against package broadcast changes. */
     66     void setTasks(List<Task.TaskKey> tasks) {
     67         mTasks = tasks;
     68     }
     69 
     70     @Override
     71     public void onPackageRemoved(String packageName, int uid) {
     72         if (mCb == null) return;
     73 
     74         // Identify all the tasks that should be removed as a result of the package being removed.
     75         // Using a set to ensure that we callback once per unique component.
     76         HashSet<ComponentName> componentsToRemove = new HashSet<ComponentName>();
     77         for (Task.TaskKey t : mTasks) {
     78             ComponentName cn = t.baseIntent.getComponent();
     79             if (cn.getPackageName().equals(packageName)) {
     80                 componentsToRemove.add(cn);
     81             }
     82         }
     83         // Notify our callbacks that the components no longer exist
     84         mCb.onComponentRemoved(componentsToRemove);
     85     }
     86 
     87     @Override
     88     public boolean onPackageChanged(String packageName, int uid, String[] components) {
     89         onPackageModified(packageName);
     90         return true;
     91     }
     92 
     93     @Override
     94     public void onPackageModified(String packageName) {
     95         if (mCb == null) return;
     96 
     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> componentsKnownToExist = new HashSet<ComponentName>();
    100         HashSet<ComponentName> componentsToRemove = new HashSet<ComponentName>();
    101         for (Task.TaskKey t : mTasks) {
    102             ComponentName cn = t.baseIntent.getComponent();
    103             if (cn.getPackageName().equals(packageName)) {
    104                 if (componentsKnownToExist.contains(cn)) {
    105                     // If we know that the component still exists in the package, then skip
    106                     continue;
    107                 }
    108                 if (mSystemServicesProxy.getActivityInfo(cn) != null) {
    109                     componentsKnownToExist.add(cn);
    110                 } else {
    111                     componentsToRemove.add(cn);
    112                 }
    113             }
    114         }
    115         // Notify our callbacks that the components no longer exist
    116         mCb.onComponentRemoved(componentsToRemove);
    117     }
    118 }
    119