1 files changed, 97 insertions, 0 deletions
diff --git a/java/com/android/incallui/answer/impl/classifier/ProximityClassifier.java b/java/com/android/incallui/answer/impl/classifier/ProximityClassifier.java
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+++ b/java/com/android/incallui/answer/impl/classifier/ProximityClassifier.java
@@ -0,0 +1,97 @@
+/*
+ * 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);
+  }
+}