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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.SensorEvent;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import com.android.dialer.configprovider.ConfigProviderBindings;
/** An classifier trying to determine whether it is a human interacting with the phone or not. */
class HumanInteractionClassifier extends Classifier {
private static final String CONFIG_ANSWER_FALSE_TOUCH_DETECTION_ENABLED =
"answer_false_touch_detection_enabled";
private final StrokeClassifier[] mStrokeClassifiers;
private final GestureClassifier[] mGestureClassifiers;
private final HistoryEvaluator mHistoryEvaluator;
private final boolean mEnabled;
HumanInteractionClassifier(Context context) {
DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
// If the phone is rotated to landscape, the calculations would be wrong if xdpi and ydpi
// were to be used separately. Due negligible differences in xdpi and ydpi we can just
// take the average.
// Note that xdpi and ydpi are the physical pixels per inch and are not affected by scaling.
float dpi = (displayMetrics.xdpi + displayMetrics.ydpi) / 2.0f;
mClassifierData = new ClassifierData(dpi, displayMetrics.heightPixels);
mHistoryEvaluator = new HistoryEvaluator();
mEnabled =
ConfigProviderBindings.get(context)
.getBoolean(CONFIG_ANSWER_FALSE_TOUCH_DETECTION_ENABLED, true);
mStrokeClassifiers =
new StrokeClassifier[] {
new AnglesClassifier(mClassifierData),
new SpeedClassifier(mClassifierData),
new DurationCountClassifier(mClassifierData),
new EndPointRatioClassifier(mClassifierData),
new EndPointLengthClassifier(mClassifierData),
new AccelerationClassifier(mClassifierData),
new SpeedAnglesClassifier(mClassifierData),
new LengthCountClassifier(mClassifierData),
new DirectionClassifier(mClassifierData)
};
mGestureClassifiers =
new GestureClassifier[] {
new PointerCountClassifier(mClassifierData), new ProximityClassifier(mClassifierData)
};
}
@Override
public void onTouchEvent(MotionEvent event) {
// If the user is dragging down the notification, they might want to drag it down
// enough to see the content, read it for a while and then lift the finger to open
// the notification. This kind of motion scores very bad in the Classifier so the
// MotionEvents which are close to the current position of the finger are not
// sent to the classifiers until the finger moves far enough. When the finger if lifted
// up, the last MotionEvent which was far enough from the finger is set as the final
// MotionEvent and sent to the Classifiers.
addTouchEvent(event);
}
private void addTouchEvent(MotionEvent event) {
mClassifierData.update(event);
for (StrokeClassifier c : mStrokeClassifiers) {
c.onTouchEvent(event);
}
for (GestureClassifier c : mGestureClassifiers) {
c.onTouchEvent(event);
}
int size = mClassifierData.getEndingStrokes().size();
for (int i = 0; i < size; i++) {
Stroke stroke = mClassifierData.getEndingStrokes().get(i);
float evaluation = 0.0f;
for (StrokeClassifier c : mStrokeClassifiers) {
float e = c.getFalseTouchEvaluation(stroke);
evaluation += e;
}
mHistoryEvaluator.addStroke(evaluation);
}
int action = event.getActionMasked();
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
float evaluation = 0.0f;
for (GestureClassifier c : mGestureClassifiers) {
float e = c.getFalseTouchEvaluation();
evaluation += e;
}
mHistoryEvaluator.addGesture(evaluation);
}
mClassifierData.cleanUp(event);
}
@Override
public void onSensorChanged(SensorEvent event) {
for (Classifier c : mStrokeClassifiers) {
c.onSensorChanged(event);
}
for (Classifier c : mGestureClassifiers) {
c.onSensorChanged(event);
}
}
boolean isFalseTouch() {
float evaluation = mHistoryEvaluator.getEvaluation();
return evaluation >= 5.0f;
}
public boolean isEnabled() {
return mEnabled;
}
@Override
public String getTag() {
return "HIC";
}
}
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