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/*
* Copyright 2014 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
package org.appspot.apprtc;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Build;
import android.util.Log;
import androidx.annotation.Nullable;
import org.appspot.apprtc.util.AppRTCUtils;
import org.webrtc.ThreadUtils;
/**
* AppRTCProximitySensor manages functions related to the proximity sensor in
* the AppRTC demo.
* On most device, the proximity sensor is implemented as a boolean-sensor.
* It returns just two values "NEAR" or "FAR". Thresholding is done on the LUX
* value i.e. the LUX value of the light sensor is compared with a threshold.
* A LUX-value more than the threshold means the proximity sensor returns "FAR".
* Anything less than the threshold value and the sensor returns "NEAR".
*/
public class AppRTCProximitySensor implements SensorEventListener {
private static final String TAG = "AppRTCProximitySensor";
// This class should be created, started and stopped on one thread
// (e.g. the main thread). We use `nonThreadSafe` to ensure that this is
// the case. Only active when `DEBUG` is set to true.
private final ThreadUtils.ThreadChecker threadChecker = new ThreadUtils.ThreadChecker();
private final Runnable onSensorStateListener;
private final SensorManager sensorManager;
@Nullable private Sensor proximitySensor;
private boolean lastStateReportIsNear;
/** Construction */
static AppRTCProximitySensor create(Context context, Runnable sensorStateListener) {
return new AppRTCProximitySensor(context, sensorStateListener);
}
private AppRTCProximitySensor(Context context, Runnable sensorStateListener) {
Log.d(TAG, "AppRTCProximitySensor" + AppRTCUtils.getThreadInfo());
onSensorStateListener = sensorStateListener;
sensorManager = ((SensorManager) context.getSystemService(Context.SENSOR_SERVICE));
}
/**
* Activate the proximity sensor. Also do initialization if called for the
* first time.
*/
public boolean start() {
threadChecker.checkIsOnValidThread();
Log.d(TAG, "start" + AppRTCUtils.getThreadInfo());
if (!initDefaultSensor()) {
// Proximity sensor is not supported on this device.
return false;
}
sensorManager.registerListener(this, proximitySensor, SensorManager.SENSOR_DELAY_NORMAL);
return true;
}
/** Deactivate the proximity sensor. */
public void stop() {
threadChecker.checkIsOnValidThread();
Log.d(TAG, "stop" + AppRTCUtils.getThreadInfo());
if (proximitySensor == null) {
return;
}
sensorManager.unregisterListener(this, proximitySensor);
}
/** Getter for last reported state. Set to true if "near" is reported. */
public boolean sensorReportsNearState() {
threadChecker.checkIsOnValidThread();
return lastStateReportIsNear;
}
@Override
public final void onAccuracyChanged(Sensor sensor, int accuracy) {
threadChecker.checkIsOnValidThread();
AppRTCUtils.assertIsTrue(sensor.getType() == Sensor.TYPE_PROXIMITY);
if (accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE) {
Log.e(TAG, "The values returned by this sensor cannot be trusted");
}
}
@Override
public final void onSensorChanged(SensorEvent event) {
threadChecker.checkIsOnValidThread();
AppRTCUtils.assertIsTrue(event.sensor.getType() == Sensor.TYPE_PROXIMITY);
// As a best practice; do as little as possible within this method and
// avoid blocking.
float distanceInCentimeters = event.values[0];
if (distanceInCentimeters < proximitySensor.getMaximumRange()) {
Log.d(TAG, "Proximity sensor => NEAR state");
lastStateReportIsNear = true;
} else {
Log.d(TAG, "Proximity sensor => FAR state");
lastStateReportIsNear = false;
}
// Report about new state to listening client. Client can then call
// sensorReportsNearState() to query the current state (NEAR or FAR).
if (onSensorStateListener != null) {
onSensorStateListener.run();
}
Log.d(TAG, "onSensorChanged" + AppRTCUtils.getThreadInfo() + ": "
+ "accuracy=" + event.accuracy + ", timestamp=" + event.timestamp + ", distance="
+ event.values[0]);
}
/**
* Get default proximity sensor if it exists. Tablet devices (e.g. Nexus 7)
* does not support this type of sensor and false will be returned in such
* cases.
*/
private boolean initDefaultSensor() {
if (proximitySensor != null) {
return true;
}
proximitySensor = sensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
if (proximitySensor == null) {
return false;
}
logProximitySensorInfo();
return true;
}
/** Helper method for logging information about the proximity sensor. */
private void logProximitySensorInfo() {
if (proximitySensor == null) {
return;
}
StringBuilder info = new StringBuilder("Proximity sensor: ");
info.append("name=").append(proximitySensor.getName());
info.append(", vendor: ").append(proximitySensor.getVendor());
info.append(", power: ").append(proximitySensor.getPower());
info.append(", resolution: ").append(proximitySensor.getResolution());
info.append(", max range: ").append(proximitySensor.getMaximumRange());
info.append(", min delay: ").append(proximitySensor.getMinDelay());
info.append(", type: ").append(proximitySensor.getStringType());
info.append(", max delay: ").append(proximitySensor.getMaxDelay());
info.append(", reporting mode: ").append(proximitySensor.getReportingMode());
info.append(", isWakeUpSensor: ").append(proximitySensor.isWakeUpSensor());
Log.d(TAG, info.toString());
}
}