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/*
* Copyright (C) 2013 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.settings;
import android.app.ActivityManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.UserHandle;
import com.android.internal.annotations.VisibleForTesting;
import com.android.systemui.broadcast.BroadcastDispatcher;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
public abstract class CurrentUserTracker {
private final UserReceiver mUserReceiver;
private Consumer<Integer> mCallback = this::onUserSwitched;
public CurrentUserTracker(BroadcastDispatcher broadcastDispatcher) {
this(UserReceiver.getInstance(broadcastDispatcher));
}
@VisibleForTesting
CurrentUserTracker(UserReceiver receiver) {
mUserReceiver = receiver;
}
public int getCurrentUserId() {
return mUserReceiver.getCurrentUserId();
}
public void startTracking() {
mUserReceiver.addTracker(mCallback);
}
public void stopTracking() {
mUserReceiver.removeTracker(mCallback);
}
public abstract void onUserSwitched(int newUserId);
@VisibleForTesting
static class UserReceiver extends BroadcastReceiver {
private static UserReceiver sInstance;
private boolean mReceiverRegistered;
private int mCurrentUserId;
private final BroadcastDispatcher mBroadcastDispatcher;
private List<Consumer<Integer>> mCallbacks = new ArrayList<>();
@VisibleForTesting
UserReceiver(BroadcastDispatcher broadcastDispatcher) {
mBroadcastDispatcher = broadcastDispatcher;
}
static UserReceiver getInstance(BroadcastDispatcher broadcastDispatcher) {
if (sInstance == null) {
sInstance = new UserReceiver(broadcastDispatcher);
}
return sInstance;
}
@Override
public void onReceive(Context context, Intent intent) {
if (Intent.ACTION_USER_SWITCHED.equals(intent.getAction())) {
notifyUserSwitched(intent.getIntExtra(Intent.EXTRA_USER_HANDLE, 0));
}
}
public int getCurrentUserId() {
return mCurrentUserId;
}
private void addTracker(Consumer<Integer> callback) {
if (!mCallbacks.contains(callback)) {
mCallbacks.add(callback);
}
if (!mReceiverRegistered) {
mCurrentUserId = ActivityManager.getCurrentUser();
IntentFilter filter = new IntentFilter(Intent.ACTION_USER_SWITCHED);
mBroadcastDispatcher.registerReceiver(this, filter, null,
UserHandle.ALL);
mReceiverRegistered = true;
}
}
private void removeTracker(Consumer<Integer> callback) {
if (mCallbacks.contains(callback)) {
mCallbacks.remove(callback);
if (mCallbacks.size() == 0 && mReceiverRegistered) {
mBroadcastDispatcher.unregisterReceiver(this);
mReceiverRegistered = false;
}
}
}
private void notifyUserSwitched(int newUserId) {
if (mCurrentUserId != newUserId) {
mCurrentUserId = newUserId;
List<Consumer<Integer>> callbacks = new ArrayList<>(mCallbacks);
for (Consumer<Integer> consumer : callbacks) {
// Accepting may modify this list
if (mCallbacks.contains(consumer)) {
consumer.accept(newUserId);
}
}
}
}
}
}
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