67 lines
2.2 KiB
Java
67 lines
2.2 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.incallui.answerproximitysensor;
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import android.util.ArraySet;
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import java.util.Set;
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/**
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* Stores a fake screen on/off state for the {@link InCallActivity}. If InCallActivity see the state
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* is off, it will draw a black view over the activity pretending the screen is off.
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*
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* <p>If the screen is already touched when the screen is turned on, the OS behavior is sending a
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* new DOWN event once the point started moving and then behave as a normal gesture. To prevent
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* accidental answer/rejects, touches that started when the screen is off should be ignored.
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*
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* <p>a bug on certain devices with N-DR1, if the screen is already touched when the screen is
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* turned on, a "DOWN MOVE UP" will be sent for each movement before the touch is actually released.
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* These events is hard to discern from other normal events, and keeping the screen on reduces its'
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* probability.
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*/
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public class PseudoScreenState {
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/** Notifies when the on state has changed. */
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public interface StateChangedListener {
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void onPseudoScreenStateChanged(boolean isOn);
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}
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private final Set<StateChangedListener> listeners = new ArraySet<>();
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private boolean on = true;
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public boolean isOn() {
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return on;
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}
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public void setOn(boolean value) {
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if (on != value) {
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on = value;
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for (StateChangedListener listener : listeners) {
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listener.onPseudoScreenStateChanged(on);
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}
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}
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}
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public void addListener(StateChangedListener listener) {
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listeners.add(listener);
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}
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public void removeListener(StateChangedListener listener) {
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listeners.remove(listener);
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}
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}
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