1 /*
2  * Copyright (C) 2021 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.dreams;
18 
19 import static com.android.systemui.dreams.dagger.DreamModule.DREAM_OVERLAY_SERVICE_COMPONENT;
20 
21 import android.content.BroadcastReceiver;
22 import android.content.ComponentName;
23 import android.content.Context;
24 import android.content.Intent;
25 import android.content.IntentFilter;
26 import android.content.pm.PackageManager;
27 import android.content.pm.PackageManager.NameNotFoundException;
28 import android.content.res.Resources;
29 import android.os.PatternMatcher;
30 import android.os.RemoteException;
31 import android.os.ServiceManager;
32 import android.service.dreams.DreamService;
33 import android.service.dreams.IDreamManager;
34 import android.util.Log;
35 
36 import com.android.systemui.dagger.qualifiers.Main;
37 import com.android.systemui.dagger.qualifiers.SystemUser;
38 import com.android.systemui.shared.condition.Monitor;
39 import com.android.systemui.util.condition.ConditionalCoreStartable;
40 
41 import javax.inject.Inject;
42 import javax.inject.Named;
43 
44 /**
45  * {@link DreamOverlayRegistrant} is responsible for telling system server that SystemUI should be
46  * the designated dream overlay component.
47  */
48 public class DreamOverlayRegistrant extends ConditionalCoreStartable {
49     private static final String TAG = "DreamOverlayRegistrant";
50     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
51     private final IDreamManager mDreamManager;
52     private final ComponentName mOverlayServiceComponent;
53     private final Context mContext;
54     private final Resources mResources;
55     private boolean mCurrentRegisteredState = false;
56 
57     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
58         @Override
59         public void onReceive(Context context, Intent intent) {
60             if (DEBUG) {
61                 Log.d(TAG, "package changed receiver - onReceive");
62             }
63 
64             registerOverlayService();
65         }
66     };
67 
registerOverlayService()68     private void registerOverlayService() {
69         // Check to see if the service has been disabled by the user. In this case, we should not
70         // proceed modifying the enabled setting.
71         final PackageManager packageManager = mContext.getPackageManager();
72         final int enabledState =
73                 packageManager.getComponentEnabledSetting(mOverlayServiceComponent);
74 
75         // The overlay service is only registered when its component setting is enabled.
76         boolean register = false;
77 
78         try {
79             register = packageManager.getServiceInfo(mOverlayServiceComponent,
80                 PackageManager.GET_META_DATA).enabled;
81         } catch (NameNotFoundException e) {
82             Log.e(TAG, "could not find dream overlay service");
83         }
84 
85         if (mCurrentRegisteredState == register) {
86             return;
87         }
88 
89         mCurrentRegisteredState = register;
90 
91         try {
92             if (DEBUG) {
93                 Log.d(TAG, mCurrentRegisteredState
94                         ? "registering dream overlay service:" + mOverlayServiceComponent
95                         : "clearing dream overlay service");
96             }
97 
98             mDreamManager.registerDreamOverlayService(
99                     mCurrentRegisteredState ? mOverlayServiceComponent : null);
100         } catch (RemoteException e) {
101             Log.e(TAG, "could not register dream overlay service:" + e);
102         }
103     }
104 
105     @Inject
DreamOverlayRegistrant(Context context, @Main Resources resources, @Named(DREAM_OVERLAY_SERVICE_COMPONENT) ComponentName dreamOverlayServiceComponent, @SystemUser Monitor monitor)106     public DreamOverlayRegistrant(Context context, @Main Resources resources,
107             @Named(DREAM_OVERLAY_SERVICE_COMPONENT) ComponentName dreamOverlayServiceComponent,
108             @SystemUser Monitor monitor) {
109         super(monitor);
110         mContext = context;
111         mResources = resources;
112         mDreamManager = IDreamManager.Stub.asInterface(
113                 ServiceManager.getService(DreamService.DREAM_SERVICE));
114         mOverlayServiceComponent = dreamOverlayServiceComponent;
115     }
116 
117     @Override
onStart()118     protected void onStart() {
119         final IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_CHANGED);
120         filter.addDataScheme("package");
121         filter.addDataSchemeSpecificPart(mOverlayServiceComponent.getPackageName(),
122                 PatternMatcher.PATTERN_LITERAL);
123         // Note that we directly register the receiver here as data schemes are not supported by
124         // BroadcastDispatcher.
125         mContext.registerReceiver(mReceiver, filter);
126 
127         registerOverlayService();
128     }
129 }
130