1 files changed, 66 insertions, 0 deletions
diff --git a/java/com/android/incallui/answerproximitysensor/PseudoScreenState.java b/java/com/android/incallui/answerproximitysensor/PseudoScreenState.java
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+++ b/java/com/android/incallui/answerproximitysensor/PseudoScreenState.java
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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.answerproximitysensor;
+
+import android.util.ArraySet;
+import java.util.Set;
+
+/**
+ * Stores a fake screen on/off state for the {@link InCallActivity}. If InCallActivity see the state
+ * is off, it will draw a black view over the activity pretending the screen is off.
+ *
+ * <p>If the screen is already touched when the screen is turned on, the OS behavior is sending a
+ * new DOWN event once the point started moving and then behave as a normal gesture. To prevent
+ * accidental answer/rejects, touches that started when the screen is off should be ignored.
+ *
+ * <p>b/31499931 on certain devices with N-DR1, if the screen is already touched when the screen is
+ * turned on, a "DOWN MOVE UP" will be sent for each movement before the touch is actually released.
+ * These events is hard to discern from other normal events, and keeping the screen on reduces its'
+ * probability.
+ */
+public class PseudoScreenState {
+
+  /** Notifies when the on state has changed. */
+  public interface StateChangedListener {
+    void onPseudoScreenStateChanged(boolean isOn);
+  }
+
+  private final Set<StateChangedListener> listeners = new ArraySet<>();
+
+  private boolean on = true;
+
+  public boolean isOn() {
+    return on;
+  }
+
+  public void setOn(boolean value) {
+    if (on != value) {
+      on = value;
+      for (StateChangedListener listener : listeners) {
+        listener.onPseudoScreenStateChanged(on);
+      }
+    }
+  }
+
+  public void addListener(StateChangedListener listener) {
+    listeners.add(listener);
+  }
+
+  public void removeListener(StateChangedListener listener) {
+    listeners.remove(listener);
+  }
+}