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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.Context;
     20 import android.os.UserHandle;
     21 
     22 import com.android.internal.content.PackageMonitor;
     23 import com.android.systemui.recents.events.EventBus;
     24 import com.android.systemui.recents.events.activity.PackagesChangedEvent;
     25 import com.android.systemui.recents.misc.ForegroundThread;
     26 
     27 /**
     28  * The package monitor listens for changes from PackageManager to update the contents of the
     29  * Recents list.
     30  */
     31 public class RecentsPackageMonitor extends PackageMonitor {
     32 
     33     /** Registers the broadcast receivers with the specified callbacks. */
     34     public void register(Context context) {
     35         try {
     36             // We register for events from all users, but will cross-reference them with
     37             // packages for the current user and any profiles they have.  Ensure that events are
     38             // handled in a background thread.
     39             register(context, ForegroundThread.get().getLooper(), UserHandle.ALL, true);
     40         } catch (IllegalStateException e) {
     41             e.printStackTrace();
     42         }
     43     }
     44 
     45     /** Unregisters the broadcast receivers. */
     46     @Override
     47     public void unregister() {
     48         try {
     49             super.unregister();
     50         } catch (IllegalStateException e) {
     51             e.printStackTrace();
     52         }
     53     }
     54 
     55     @Override
     56     public void onPackageRemoved(String packageName, int uid) {
     57         // Notify callbacks on the main thread that a package has changed
     58         final int eventUserId = getChangingUserId();
     59         EventBus.getDefault().post(new PackagesChangedEvent(this, packageName, eventUserId));
     60     }
     61 
     62     @Override
     63     public boolean onPackageChanged(String packageName, int uid, String[] components) {
     64         onPackageModified(packageName);
     65         return true;
     66     }
     67 
     68     @Override
     69     public void onPackageModified(String packageName) {
     70         // Notify callbacks on the main thread that a package has changed
     71         final int eventUserId = getChangingUserId();
     72         EventBus.getDefault().post(new PackagesChangedEvent(this, packageName, eventUserId));
     73     }
     74 }
     75