Dave Mankoff | 46b9d68 | 2019-09-12 13:39:42 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.systemui.util; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.hardware.Sensor; |
| 21 | import android.hardware.SensorEvent; |
| 22 | import android.hardware.SensorEventListener; |
| 23 | import android.hardware.SensorManager; |
| 24 | import android.util.Log; |
| 25 | |
| 26 | import com.android.systemui.R; |
| 27 | |
| 28 | import java.util.ArrayList; |
| 29 | import java.util.List; |
| 30 | |
| 31 | import javax.inject.Inject; |
| 32 | |
| 33 | /** |
| 34 | * Simple wrapper around SensorManager customized for the Proximity sensor. |
| 35 | */ |
| 36 | public class ProximitySensor { |
| 37 | private static final String TAG = "ProxSensor"; |
| 38 | private static final boolean DEBUG = false; |
| 39 | |
| 40 | private final Sensor mSensor; |
| 41 | private final AsyncSensorManager mSensorManager; |
| 42 | private final boolean mUsingBrightnessSensor; |
| 43 | private final float mMaxRange; |
| 44 | |
| 45 | private SensorEventListener mSensorEventListener = new SensorEventListener() { |
| 46 | @Override |
| 47 | public synchronized void onSensorChanged(SensorEvent event) { |
| 48 | onSensorEvent(event); |
| 49 | } |
| 50 | |
| 51 | @Override |
| 52 | public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| 53 | } |
| 54 | }; |
| 55 | private boolean mNear; |
| 56 | private List<ProximitySensorListener> mListeners = new ArrayList<>(); |
| 57 | private String mTag = null; |
| 58 | |
| 59 | @Inject |
| 60 | public ProximitySensor(Context context, AsyncSensorManager sensorManager) { |
| 61 | mSensorManager = sensorManager; |
| 62 | Sensor sensor = findBrightnessSensor(context, sensorManager); |
| 63 | |
| 64 | if (sensor == null) { |
| 65 | mUsingBrightnessSensor = false; |
| 66 | sensor = sensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); |
| 67 | } else { |
| 68 | mUsingBrightnessSensor = true; |
| 69 | } |
| 70 | mSensor = sensor; |
| 71 | if (mSensor != null) { |
| 72 | mMaxRange = mSensor.getMaximumRange(); |
| 73 | } else { |
| 74 | mMaxRange = 0; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | public void setTag(String tag) { |
| 79 | mTag = tag; |
| 80 | } |
| 81 | |
| 82 | private Sensor findBrightnessSensor(Context context, SensorManager sensorManager) { |
| 83 | String sensorType = context.getString(R.string.doze_brightness_sensor_type); |
| 84 | List<Sensor> sensorList = sensorManager.getSensorList(Sensor.TYPE_ALL); |
| 85 | Sensor sensor = null; |
| 86 | for (Sensor s : sensorList) { |
| 87 | if (sensorType.equals(s.getStringType())) { |
| 88 | sensor = s; |
| 89 | break; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | return sensor; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Returns {@code false} if a Proximity sensor is not available. |
| 98 | */ |
| 99 | public boolean getSensorAvailable() { |
| 100 | return mSensor != null; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Add a listener. |
| 105 | * |
| 106 | * Registers itself with the {@link SensorManager} if this is the first listener |
| 107 | * added. |
| 108 | */ |
| 109 | public boolean register(ProximitySensorListener listener) { |
| 110 | if (!getSensorAvailable()) { |
| 111 | return false; |
| 112 | } |
| 113 | |
| 114 | logDebug("using brightness sensor? " + mUsingBrightnessSensor); |
| 115 | mListeners.add(listener); |
| 116 | if (mListeners.size() == 1) { |
| 117 | logDebug("registering sensor listener"); |
| 118 | mSensorManager.registerListener( |
| 119 | mSensorEventListener, mSensor, SensorManager.SENSOR_DELAY_GAME); |
| 120 | } |
| 121 | |
| 122 | return true; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Remove a listener. |
| 127 | * |
| 128 | * If all listeners are removed from an instance of this class, |
| 129 | * it will unregister itself with the SensorManager. |
| 130 | */ |
| 131 | public void unregister(ProximitySensorListener listener) { |
| 132 | mListeners.remove(listener); |
| 133 | if (mListeners.size() == 0) { |
| 134 | logDebug("unregistering sensor listener"); |
| 135 | mSensorManager.unregisterListener(mSensorEventListener); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | public boolean isNear() { |
| 140 | return getSensorAvailable() && mNear; |
| 141 | } |
| 142 | |
| 143 | private void onSensorEvent(SensorEvent event) { |
| 144 | boolean near = event.values[0] < mMaxRange; |
| 145 | if (mUsingBrightnessSensor) { |
| 146 | near = event.values[0] == 0; |
| 147 | } |
| 148 | mNear = near; |
| 149 | mListeners.forEach(proximitySensorListener -> |
| 150 | proximitySensorListener.onProximitySensorEvent( |
| 151 | new ProximityEvent(mNear, event.timestamp))); |
| 152 | } |
| 153 | |
| 154 | /** Implement to be notified of ProximityEvents. */ |
| 155 | public interface ProximitySensorListener { |
| 156 | /** Called when the ProximitySensor changes. */ |
| 157 | void onProximitySensorEvent(ProximityEvent proximityEvent); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Returned when the near/far state of a {@link ProximitySensor} changes. |
| 162 | */ |
| 163 | public static class ProximityEvent { |
| 164 | private final boolean mNear; |
| 165 | private final long mTimestampNs; |
| 166 | |
| 167 | public ProximityEvent(boolean near, long timestampNs) { |
| 168 | mNear = near; |
| 169 | mTimestampNs = timestampNs; |
| 170 | } |
| 171 | |
| 172 | public boolean getNear() { |
| 173 | return mNear; |
| 174 | } |
| 175 | |
| 176 | public long getTimestampNs() { |
| 177 | return mTimestampNs; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | private void logDebug(String msg) { |
| 182 | if (DEBUG) { |
| 183 | Log.d(TAG, (mTag != null ? "[" + mTag + "] " : "") + msg); |
| 184 | } |
| 185 | } |
| 186 | } |