1 files changed, 140 insertions, 0 deletions
diff --git a/java/com/android/incallui/answer/impl/classifier/FalsingManager.java b/java/com/android/incallui/answer/impl/classifier/FalsingManager.java
new file mode 100644
index 000000000..fdcc0a3f9
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+++ b/java/com/android/incallui/answer/impl/classifier/FalsingManager.java
@@ -0,0 +1,140 @@
+/*
+ * 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.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) {
+    for (int sensorType : sensors) {
+      Sensor s = mSensorManager.getDefaultSensor(sensorType);
+      if (s != null) {
+        mSensorManager.registerListener(this, s, SensorManager.SENSOR_DELAY_GAME);
+      }
+    }
+  }
+}