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/*
* Copyright (C) 2016 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.incallui.answerproximitysensor;
import android.util.ArraySet;
import java.util.Set;
/**
* Stores a fake screen on/off state for the {@link InCallActivity}. If InCallActivity see the state
* is off, it will draw a black view over the activity pretending the screen is off.
*
* <p>If the screen is already touched when the screen is turned on, the OS behavior is sending a
* new DOWN event once the point started moving and then behave as a normal gesture. To prevent
* accidental answer/rejects, touches that started when the screen is off should be ignored.
*
* <p>a bug on certain devices with N-DR1, if the screen is already touched when the screen is
* turned on, a "DOWN MOVE UP" will be sent for each movement before the touch is actually released.
* These events is hard to discern from other normal events, and keeping the screen on reduces its'
* probability.
*/
public class PseudoScreenState {
/** Notifies when the on state has changed. */
public interface StateChangedListener {
void onPseudoScreenStateChanged(boolean isOn);
}
private final Set<StateChangedListener> listeners = new ArraySet<>();
private boolean on = true;
public boolean isOn() {
return on;
}
public void setOn(boolean value) {
if (on != value) {
on = value;
for (StateChangedListener listener : listeners) {
listener.onPseudoScreenStateChanged(on);
}
}
}
public void addListener(StateChangedListener listener) {
listeners.add(listener);
}
public void removeListener(StateChangedListener listener) {
listeners.remove(listener);
}
}
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