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/*
* Copyright (C) 2015 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.hardware.Sensor;
import android.hardware.SensorEvent;
import android.view.MotionEvent;
import java.util.concurrent.TimeUnit;
/**
* A classifier which looks at the proximity sensor during the gesture. It calculates the percentage
* the proximity sensor showing the near state during the whole gesture
*/
class ProximityClassifier extends GestureClassifier {
private long mGestureStartTimeNano;
private long mNearStartTimeNano;
private long mNearDuration;
private boolean mNear;
private float mAverageNear;
public ProximityClassifier(ClassifierData classifierData) {}
@Override
public String getTag() {
return "PROX";
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_PROXIMITY) {
update(event.values[0] < event.sensor.getMaximumRange(), event.timestamp);
}
}
@Override
public void onTouchEvent(MotionEvent event) {
int action = event.getActionMasked();
if (action == MotionEvent.ACTION_DOWN) {
mGestureStartTimeNano = TimeUnit.MILLISECONDS.toNanos(event.getEventTime());
mNearStartTimeNano = TimeUnit.MILLISECONDS.toNanos(event.getEventTime());
mNearDuration = 0;
}
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
update(mNear, TimeUnit.MILLISECONDS.toNanos(event.getEventTime()));
long duration = TimeUnit.MILLISECONDS.toNanos(event.getEventTime()) - mGestureStartTimeNano;
if (duration == 0) {
mAverageNear = mNear ? 1.0f : 0.0f;
} else {
mAverageNear = (float) mNearDuration / (float) duration;
}
}
}
/**
* @param near is the sensor showing the near state right now
* @param timestampNano time of this event in nanoseconds
*/
private void update(boolean near, long timestampNano) {
// This if is necessary because MotionEvents and SensorEvents do not come in
// chronological order
if (timestampNano > mNearStartTimeNano) {
// if the state before was near then add the difference of the current time and
// mNearStartTimeNano to mNearDuration.
if (mNear) {
mNearDuration += timestampNano - mNearStartTimeNano;
}
// if the new state is near, set mNearStartTimeNano equal to this moment.
if (near) {
mNearStartTimeNano = timestampNano;
}
}
mNear = near;
}
@Override
public float getFalseTouchEvaluation() {
return ProximityEvaluator.evaluate(mAverageNear);
}
}
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