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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.answer.impl.classifier;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.PowerManager;
import android.os.Trace;
import android.view.MotionEvent;
import android.view.accessibility.AccessibilityManager;
/**
* When the phone is locked, listens to touch, sensor and phone events and sends them to
* HumanInteractionClassifier to determine if touches are coming from a human.
*/
public class FalsingManager implements SensorEventListener {
private static final int[] CLASSIFIER_SENSORS =
new int[] {
Sensor.TYPE_PROXIMITY,
};
private final SensorManager mSensorManager;
private final HumanInteractionClassifier mHumanInteractionClassifier;
private final AccessibilityManager mAccessibilityManager;
private boolean mSessionActive = false;
private boolean mScreenOn;
public FalsingManager(Context context) {
mSensorManager = context.getSystemService(SensorManager.class);
mAccessibilityManager = context.getSystemService(AccessibilityManager.class);
mHumanInteractionClassifier = new HumanInteractionClassifier(context);
mScreenOn = context.getSystemService(PowerManager.class).isInteractive();
}
/** Returns {@code true} iff the FalsingManager is enabled and able to classify touches */
public boolean isEnabled() {
return mHumanInteractionClassifier.isEnabled();
}
/**
* Returns {@code true} iff the classifier determined that this is not a human interacting with
* the phone.
*/
public boolean isFalseTouch() {
// Touch exploration triggers false positives in the classifier and
// already sufficiently prevents false unlocks.
return !mAccessibilityManager.isTouchExplorationEnabled()
&& mHumanInteractionClassifier.isFalseTouch();
}
/**
* Should be called when the screen turns on and the related Views become visible. This will start
* tracking changes if the manager is enabled.
*/
public void onScreenOn() {
mScreenOn = true;
sessionEntrypoint();
}
/**
* Should be called when the screen turns off or the related Views are no longer visible. This
* will cause the manager to stop tracking changes.
*/
public void onScreenOff() {
mScreenOn = false;
sessionExitpoint();
}
/**
* Should be called when a new touch event has been received and should be classified.
*
* @param event MotionEvent to be classified as human or false.
*/
public void onTouchEvent(MotionEvent event) {
if (mSessionActive) {
mHumanInteractionClassifier.onTouchEvent(event);
}
}
@Override
public synchronized void onSensorChanged(SensorEvent event) {
mHumanInteractionClassifier.onSensorChanged(event);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {}
private boolean shouldSessionBeActive() {
return isEnabled() && mScreenOn;
}
private boolean sessionEntrypoint() {
if (!mSessionActive && shouldSessionBeActive()) {
onSessionStart();
return true;
}
return false;
}
private void sessionExitpoint() {
if (mSessionActive && !shouldSessionBeActive()) {
mSessionActive = false;
mSensorManager.unregisterListener(this);
}
}
private void onSessionStart() {
mSessionActive = true;
if (mHumanInteractionClassifier.isEnabled()) {
registerSensors(CLASSIFIER_SENSORS);
}
}
private void registerSensors(int[] sensors) {
Trace.beginSection("FalsingManager.registerSensors");
for (int sensorType : sensors) {
Trace.beginSection("get sensor " + sensorType);
Sensor s = mSensorManager.getDefaultSensor(sensorType);
Trace.endSection();
if (s != null) {
Trace.beginSection("register");
mSensorManager.registerListener(this, s, SensorManager.SENSOR_DELAY_GAME);
Trace.endSection();
}
}
Trace.endSection();
}
}
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