Jason Monk | 9abca5e | 2016-11-11 16:18:14 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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.statusbar.policy; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.content.pm.PackageManager; |
| 21 | import android.hardware.camera2.CameraAccessException; |
| 22 | import android.hardware.camera2.CameraCharacteristics; |
| 23 | import android.hardware.camera2.CameraManager; |
| 24 | import android.os.Handler; |
| 25 | import android.os.HandlerThread; |
| 26 | import android.os.Process; |
| 27 | import android.text.TextUtils; |
| 28 | import android.util.Log; |
| 29 | |
| 30 | import com.android.systemui.statusbar.policy.FlashlightController.FlashlightListener; |
| 31 | |
| 32 | import java.io.FileDescriptor; |
| 33 | import java.io.PrintWriter; |
| 34 | import java.lang.ref.WeakReference; |
| 35 | import java.util.ArrayList; |
| 36 | |
| 37 | /** |
| 38 | * Manages the flashlight. |
| 39 | */ |
| 40 | public class FlashlightControllerImpl implements FlashlightController { |
| 41 | |
| 42 | private static final String TAG = "FlashlightController"; |
| 43 | private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG); |
| 44 | |
| 45 | private static final int DISPATCH_ERROR = 0; |
| 46 | private static final int DISPATCH_CHANGED = 1; |
| 47 | private static final int DISPATCH_AVAILABILITY_CHANGED = 2; |
| 48 | |
| 49 | private final CameraManager mCameraManager; |
| 50 | private final Context mContext; |
| 51 | /** Call {@link #ensureHandler()} before using */ |
| 52 | private Handler mHandler; |
| 53 | |
| 54 | /** Lock on mListeners when accessing */ |
| 55 | private final ArrayList<WeakReference<FlashlightListener>> mListeners = new ArrayList<>(1); |
| 56 | |
| 57 | /** Lock on {@code this} when accessing */ |
| 58 | private boolean mFlashlightEnabled; |
| 59 | |
| 60 | private String mCameraId; |
| 61 | private boolean mTorchAvailable; |
| 62 | |
| 63 | public FlashlightControllerImpl(Context context) { |
| 64 | mContext = context; |
| 65 | mCameraManager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE); |
| 66 | |
| 67 | tryInitCamera(); |
| 68 | } |
| 69 | |
| 70 | private void tryInitCamera() { |
| 71 | try { |
| 72 | mCameraId = getCameraId(); |
| 73 | } catch (Throwable e) { |
| 74 | Log.e(TAG, "Couldn't initialize.", e); |
| 75 | return; |
| 76 | } |
| 77 | |
| 78 | if (mCameraId != null) { |
| 79 | ensureHandler(); |
| 80 | mCameraManager.registerTorchCallback(mTorchCallback, mHandler); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | public void setFlashlight(boolean enabled) { |
| 85 | boolean pendingError = false; |
| 86 | synchronized (this) { |
| 87 | if (mCameraId == null) return; |
| 88 | if (mFlashlightEnabled != enabled) { |
| 89 | mFlashlightEnabled = enabled; |
| 90 | try { |
| 91 | mCameraManager.setTorchMode(mCameraId, enabled); |
| 92 | } catch (CameraAccessException e) { |
| 93 | Log.e(TAG, "Couldn't set torch mode", e); |
| 94 | mFlashlightEnabled = false; |
| 95 | pendingError = true; |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | dispatchModeChanged(mFlashlightEnabled); |
| 100 | if (pendingError) { |
| 101 | dispatchError(); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | public boolean hasFlashlight() { |
| 106 | return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH); |
| 107 | } |
| 108 | |
| 109 | public synchronized boolean isEnabled() { |
| 110 | return mFlashlightEnabled; |
| 111 | } |
| 112 | |
| 113 | public synchronized boolean isAvailable() { |
| 114 | return mTorchAvailable; |
| 115 | } |
| 116 | |
| 117 | public void addCallback(FlashlightListener l) { |
| 118 | synchronized (mListeners) { |
| 119 | if (mCameraId == null) { |
| 120 | tryInitCamera(); |
| 121 | } |
| 122 | cleanUpListenersLocked(l); |
| 123 | mListeners.add(new WeakReference<>(l)); |
Jason Monk | 861e09a | 2017-01-11 09:41:05 -0500 | [diff] [blame^] | 124 | l.onFlashlightAvailabilityChanged(mTorchAvailable); |
| 125 | l.onFlashlightChanged(mFlashlightEnabled); |
Jason Monk | 9abca5e | 2016-11-11 16:18:14 -0500 | [diff] [blame] | 126 | } |
| 127 | } |
| 128 | |
| 129 | public void removeCallback(FlashlightListener l) { |
| 130 | synchronized (mListeners) { |
| 131 | cleanUpListenersLocked(l); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | private synchronized void ensureHandler() { |
| 136 | if (mHandler == null) { |
| 137 | HandlerThread thread = new HandlerThread(TAG, Process.THREAD_PRIORITY_BACKGROUND); |
| 138 | thread.start(); |
| 139 | mHandler = new Handler(thread.getLooper()); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | private String getCameraId() throws CameraAccessException { |
| 144 | String[] ids = mCameraManager.getCameraIdList(); |
| 145 | for (String id : ids) { |
| 146 | CameraCharacteristics c = mCameraManager.getCameraCharacteristics(id); |
| 147 | Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE); |
| 148 | Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING); |
| 149 | if (flashAvailable != null && flashAvailable |
| 150 | && lensFacing != null && lensFacing == CameraCharacteristics.LENS_FACING_BACK) { |
| 151 | return id; |
| 152 | } |
| 153 | } |
| 154 | return null; |
| 155 | } |
| 156 | |
| 157 | private void dispatchModeChanged(boolean enabled) { |
| 158 | dispatchListeners(DISPATCH_CHANGED, enabled); |
| 159 | } |
| 160 | |
| 161 | private void dispatchError() { |
| 162 | dispatchListeners(DISPATCH_CHANGED, false /* argument (ignored) */); |
| 163 | } |
| 164 | |
| 165 | private void dispatchAvailabilityChanged(boolean available) { |
| 166 | dispatchListeners(DISPATCH_AVAILABILITY_CHANGED, available); |
| 167 | } |
| 168 | |
| 169 | private void dispatchListeners(int message, boolean argument) { |
| 170 | synchronized (mListeners) { |
| 171 | final int N = mListeners.size(); |
| 172 | boolean cleanup = false; |
| 173 | for (int i = 0; i < N; i++) { |
| 174 | FlashlightListener l = mListeners.get(i).get(); |
| 175 | if (l != null) { |
| 176 | if (message == DISPATCH_ERROR) { |
| 177 | l.onFlashlightError(); |
| 178 | } else if (message == DISPATCH_CHANGED) { |
| 179 | l.onFlashlightChanged(argument); |
| 180 | } else if (message == DISPATCH_AVAILABILITY_CHANGED) { |
| 181 | l.onFlashlightAvailabilityChanged(argument); |
| 182 | } |
| 183 | } else { |
| 184 | cleanup = true; |
| 185 | } |
| 186 | } |
| 187 | if (cleanup) { |
| 188 | cleanUpListenersLocked(null); |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | private void cleanUpListenersLocked(FlashlightListener listener) { |
| 194 | for (int i = mListeners.size() - 1; i >= 0; i--) { |
| 195 | FlashlightListener found = mListeners.get(i).get(); |
| 196 | if (found == null || found == listener) { |
| 197 | mListeners.remove(i); |
| 198 | } |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | private final CameraManager.TorchCallback mTorchCallback = |
| 203 | new CameraManager.TorchCallback() { |
| 204 | |
| 205 | @Override |
| 206 | public void onTorchModeUnavailable(String cameraId) { |
| 207 | if (TextUtils.equals(cameraId, mCameraId)) { |
| 208 | setCameraAvailable(false); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | @Override |
| 213 | public void onTorchModeChanged(String cameraId, boolean enabled) { |
| 214 | if (TextUtils.equals(cameraId, mCameraId)) { |
| 215 | setCameraAvailable(true); |
| 216 | setTorchMode(enabled); |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | private void setCameraAvailable(boolean available) { |
| 221 | boolean changed; |
| 222 | synchronized (FlashlightControllerImpl.this) { |
| 223 | changed = mTorchAvailable != available; |
| 224 | mTorchAvailable = available; |
| 225 | } |
| 226 | if (changed) { |
| 227 | if (DEBUG) Log.d(TAG, "dispatchAvailabilityChanged(" + available + ")"); |
| 228 | dispatchAvailabilityChanged(available); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | private void setTorchMode(boolean enabled) { |
| 233 | boolean changed; |
| 234 | synchronized (FlashlightControllerImpl.this) { |
| 235 | changed = mFlashlightEnabled != enabled; |
| 236 | mFlashlightEnabled = enabled; |
| 237 | } |
| 238 | if (changed) { |
| 239 | if (DEBUG) Log.d(TAG, "dispatchModeChanged(" + enabled + ")"); |
| 240 | dispatchModeChanged(enabled); |
| 241 | } |
| 242 | } |
| 243 | }; |
| 244 | |
| 245 | public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 246 | pw.println("FlashlightController state:"); |
| 247 | |
| 248 | pw.print(" mCameraId="); |
| 249 | pw.println(mCameraId); |
| 250 | pw.print(" mFlashlightEnabled="); |
| 251 | pw.println(mFlashlightEnabled); |
| 252 | pw.print(" mTorchAvailable="); |
| 253 | pw.println(mTorchAvailable); |
| 254 | } |
| 255 | } |