1 /* 2 * Copyright (C) 2016 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.incallui.answerproximitysensor; 18 19 import android.util.ArraySet; 20 import java.util.Set; 21 22 /** 23 * Stores a fake screen on/off state for the {@link InCallActivity}. If InCallActivity see the state 24 * is off, it will draw a black view over the activity pretending the screen is off. 25 * 26 * <p>If the screen is already touched when the screen is turned on, the OS behavior is sending a 27 * new DOWN event once the point started moving and then behave as a normal gesture. To prevent 28 * accidental answer/rejects, touches that started when the screen is off should be ignored. 29 * 30 * <p>a bug on certain devices with N-DR1, if the screen is already touched when the screen is 31 * turned on, a "DOWN MOVE UP" will be sent for each movement before the touch is actually released. 32 * These events is hard to discern from other normal events, and keeping the screen on reduces its' 33 * probability. 34 */ 35 public class PseudoScreenState { 36 37 /** Notifies when the on state has changed. */ 38 public interface StateChangedListener { onPseudoScreenStateChanged(boolean isOn)39 void onPseudoScreenStateChanged(boolean isOn); 40 } 41 42 private final Set<StateChangedListener> listeners = new ArraySet<>(); 43 44 private boolean on = true; 45 isOn()46 public boolean isOn() { 47 return on; 48 } 49 setOn(boolean value)50 public void setOn(boolean value) { 51 if (on != value) { 52 on = value; 53 for (StateChangedListener listener : listeners) { 54 listener.onPseudoScreenStateChanged(on); 55 } 56 } 57 } 58 addListener(StateChangedListener listener)59 public void addListener(StateChangedListener listener) { 60 listeners.add(listener); 61 } 62 removeListener(StateChangedListener listener)63 public void removeListener(StateChangedListener listener) { 64 listeners.remove(listener); 65 } 66 } 67