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.answer.impl.classifier; 18 19 import android.content.Context; 20 import android.hardware.Sensor; 21 import android.hardware.SensorEvent; 22 import android.hardware.SensorEventListener; 23 import android.hardware.SensorManager; 24 import android.os.PowerManager; 25 import android.view.MotionEvent; 26 import android.view.accessibility.AccessibilityManager; 27 28 /** 29 * When the phone is locked, listens to touch, sensor and phone events and sends them to 30 * HumanInteractionClassifier to determine if touches are coming from a human. 31 */ 32 public class FalsingManager implements SensorEventListener { 33 private static final int[] CLASSIFIER_SENSORS = 34 new int[] { 35 Sensor.TYPE_PROXIMITY, 36 }; 37 38 private final SensorManager mSensorManager; 39 private final HumanInteractionClassifier mHumanInteractionClassifier; 40 private final AccessibilityManager mAccessibilityManager; 41 42 private boolean mSessionActive = false; 43 private boolean mScreenOn; 44 FalsingManager(Context context)45 public FalsingManager(Context context) { 46 mSensorManager = context.getSystemService(SensorManager.class); 47 mAccessibilityManager = context.getSystemService(AccessibilityManager.class); 48 mHumanInteractionClassifier = new HumanInteractionClassifier(context); 49 mScreenOn = context.getSystemService(PowerManager.class).isInteractive(); 50 } 51 52 /** Returns {@code true} iff the FalsingManager is enabled and able to classify touches */ isEnabled()53 public boolean isEnabled() { 54 return mHumanInteractionClassifier.isEnabled(); 55 } 56 57 /** 58 * Returns {@code true} iff the classifier determined that this is not a human interacting with 59 * the phone. 60 */ isFalseTouch()61 public boolean isFalseTouch() { 62 // Touch exploration triggers false positives in the classifier and 63 // already sufficiently prevents false unlocks. 64 return !mAccessibilityManager.isTouchExplorationEnabled() 65 && mHumanInteractionClassifier.isFalseTouch(); 66 } 67 68 /** 69 * Should be called when the screen turns on and the related Views become visible. This will start 70 * tracking changes if the manager is enabled. 71 */ onScreenOn()72 public void onScreenOn() { 73 mScreenOn = true; 74 sessionEntrypoint(); 75 } 76 77 /** 78 * Should be called when the screen turns off or the related Views are no longer visible. This 79 * will cause the manager to stop tracking changes. 80 */ onScreenOff()81 public void onScreenOff() { 82 mScreenOn = false; 83 sessionExitpoint(); 84 } 85 86 /** 87 * Should be called when a new touch event has been received and should be classified. 88 * 89 * @param event MotionEvent to be classified as human or false. 90 */ onTouchEvent(MotionEvent event)91 public void onTouchEvent(MotionEvent event) { 92 if (mSessionActive) { 93 mHumanInteractionClassifier.onTouchEvent(event); 94 } 95 } 96 97 @Override onSensorChanged(SensorEvent event)98 public synchronized void onSensorChanged(SensorEvent event) { 99 mHumanInteractionClassifier.onSensorChanged(event); 100 } 101 102 @Override onAccuracyChanged(Sensor sensor, int accuracy)103 public void onAccuracyChanged(Sensor sensor, int accuracy) {} 104 shouldSessionBeActive()105 private boolean shouldSessionBeActive() { 106 return isEnabled() && mScreenOn; 107 } 108 sessionEntrypoint()109 private boolean sessionEntrypoint() { 110 if (!mSessionActive && shouldSessionBeActive()) { 111 onSessionStart(); 112 return true; 113 } 114 return false; 115 } 116 sessionExitpoint()117 private void sessionExitpoint() { 118 if (mSessionActive && !shouldSessionBeActive()) { 119 mSessionActive = false; 120 mSensorManager.unregisterListener(this); 121 } 122 } 123 onSessionStart()124 private void onSessionStart() { 125 mSessionActive = true; 126 127 if (mHumanInteractionClassifier.isEnabled()) { 128 registerSensors(CLASSIFIER_SENSORS); 129 } 130 } 131 registerSensors(int[] sensors)132 private void registerSensors(int[] sensors) { 133 for (int sensorType : sensors) { 134 Sensor s = mSensorManager.getDefaultSensor(sensorType); 135 if (s != null) { 136 mSensorManager.registerListener(this, s, SensorManager.SENSOR_DELAY_GAME); 137 } 138 } 139 } 140 } 141