| /* |
| * 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.systemui.classifier; |
| |
| import android.hardware.Sensor; |
| import android.hardware.SensorEvent; |
| import android.view.MotionEvent; |
| |
| /** |
| * 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 |
| */ |
| public 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 = event.getEventTimeNano(); |
| mNearStartTimeNano = event.getEventTimeNano(); |
| mNearDuration = 0; |
| } |
| |
| if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) { |
| update(mNear, event.getEventTimeNano()); |
| long duration = event.getEventTimeNano() - 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(int type) { |
| return ProximityEvaluator.evaluate(mAverageNear, type); |
| } |
| } |