| /* |
| * Copyright (C) 2022 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.systemui.util.service; |
| |
| import android.content.BroadcastReceiver; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.os.PatternMatcher; |
| import android.util.Log; |
| |
| import com.google.android.collect.Lists; |
| |
| import java.lang.ref.WeakReference; |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| |
| import javax.inject.Inject; |
| |
| /** |
| * {@link PackageObserver} allows for monitoring the system for changes relating to a particular |
| * package. This can be used by clients to detect when a related package has changed and reloading |
| * is necessary. |
| */ |
| public class PackageObserver implements Observer { |
| private static final String TAG = "PackageObserver"; |
| private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG); |
| |
| private final ArrayList<WeakReference<Callback>> mCallbacks = Lists.newArrayList(); |
| |
| private final BroadcastReceiver mReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (DEBUG) { |
| Log.d(TAG, "package added receiver - onReceive"); |
| } |
| |
| final Iterator<WeakReference<Callback>> iter = mCallbacks.iterator(); |
| while (iter.hasNext()) { |
| final Callback callback = iter.next().get(); |
| if (callback != null) { |
| callback.onSourceChanged(); |
| } else { |
| iter.remove(); |
| } |
| } |
| } |
| }; |
| |
| private final String mPackageName; |
| private final Context mContext; |
| |
| @Inject |
| public PackageObserver(Context context, ComponentName component) { |
| mContext = context; |
| mPackageName = component.getPackageName(); |
| } |
| |
| @Override |
| public void addCallback(Callback callback) { |
| if (DEBUG) { |
| Log.d(TAG, "addCallback:" + callback); |
| } |
| mCallbacks.add(new WeakReference<>(callback)); |
| |
| // Only register for listening to package additions on first callback. |
| if (mCallbacks.size() > 1) { |
| return; |
| } |
| |
| final IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED); |
| filter.addDataScheme("package"); |
| filter.addDataSchemeSpecificPart(mPackageName, PatternMatcher.PATTERN_LITERAL); |
| // Note that we directly register the receiver here as data schemes are not supported by |
| // BroadcastDispatcher. |
| mContext.registerReceiver(mReceiver, filter, Context.RECEIVER_EXPORTED); |
| } |
| |
| @Override |
| public void removeCallback(Callback callback) { |
| if (DEBUG) { |
| Log.d(TAG, "removeCallback:" + callback); |
| } |
| final boolean removed = mCallbacks.removeIf(el -> el.get() == callback); |
| |
| if (removed && mCallbacks.isEmpty()) { |
| mContext.unregisterReceiver(mReceiver); |
| } |
| } |
| } |