| /* |
| * Copyright (C) 2014 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.systemui.statusbar.policy; |
| |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.hardware.camera2.CameraAccessException; |
| import android.hardware.camera2.CameraCharacteristics; |
| import android.hardware.camera2.CameraManager; |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.os.Process; |
| import android.provider.Settings; |
| import android.provider.Settings.Secure; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| import com.android.systemui.statusbar.policy.FlashlightController.FlashlightListener; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.lang.ref.WeakReference; |
| import java.util.ArrayList; |
| |
| /** |
| * Manages the flashlight. |
| */ |
| public class FlashlightControllerImpl implements FlashlightController { |
| |
| private static final String TAG = "FlashlightController"; |
| private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG); |
| |
| private static final int DISPATCH_ERROR = 0; |
| private static final int DISPATCH_CHANGED = 1; |
| private static final int DISPATCH_AVAILABILITY_CHANGED = 2; |
| |
| private static final String ACTION_FLASHLIGHT_CHANGED = |
| "com.android.settings.flashlight.action.FLASHLIGHT_CHANGED"; |
| |
| private final CameraManager mCameraManager; |
| private final Context mContext; |
| /** Call {@link #ensureHandler()} before using */ |
| private Handler mHandler; |
| |
| /** Lock on mListeners when accessing */ |
| private final ArrayList<WeakReference<FlashlightListener>> mListeners = new ArrayList<>(1); |
| |
| /** Lock on {@code this} when accessing */ |
| private boolean mFlashlightEnabled; |
| |
| private String mCameraId; |
| private boolean mTorchAvailable; |
| |
| public FlashlightControllerImpl(Context context) { |
| mContext = context; |
| mCameraManager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE); |
| |
| tryInitCamera(); |
| } |
| |
| private void tryInitCamera() { |
| try { |
| mCameraId = getCameraId(); |
| } catch (Throwable e) { |
| Log.e(TAG, "Couldn't initialize.", e); |
| return; |
| } |
| |
| if (mCameraId != null) { |
| ensureHandler(); |
| mCameraManager.registerTorchCallback(mTorchCallback, mHandler); |
| } |
| } |
| |
| public void setFlashlight(boolean enabled) { |
| boolean pendingError = false; |
| synchronized (this) { |
| if (mCameraId == null) return; |
| if (mFlashlightEnabled != enabled) { |
| mFlashlightEnabled = enabled; |
| try { |
| mCameraManager.setTorchMode(mCameraId, enabled); |
| } catch (CameraAccessException e) { |
| Log.e(TAG, "Couldn't set torch mode", e); |
| mFlashlightEnabled = false; |
| pendingError = true; |
| } |
| } |
| } |
| dispatchModeChanged(mFlashlightEnabled); |
| if (pendingError) { |
| dispatchError(); |
| } |
| } |
| |
| public boolean hasFlashlight() { |
| return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH); |
| } |
| |
| public synchronized boolean isEnabled() { |
| return mFlashlightEnabled; |
| } |
| |
| public synchronized boolean isAvailable() { |
| return mTorchAvailable; |
| } |
| |
| public void addCallback(FlashlightListener l) { |
| synchronized (mListeners) { |
| if (mCameraId == null) { |
| tryInitCamera(); |
| } |
| cleanUpListenersLocked(l); |
| mListeners.add(new WeakReference<>(l)); |
| l.onFlashlightAvailabilityChanged(mTorchAvailable); |
| l.onFlashlightChanged(mFlashlightEnabled); |
| } |
| } |
| |
| public void removeCallback(FlashlightListener l) { |
| synchronized (mListeners) { |
| cleanUpListenersLocked(l); |
| } |
| } |
| |
| private synchronized void ensureHandler() { |
| if (mHandler == null) { |
| HandlerThread thread = new HandlerThread(TAG, Process.THREAD_PRIORITY_BACKGROUND); |
| thread.start(); |
| mHandler = new Handler(thread.getLooper()); |
| } |
| } |
| |
| private String getCameraId() throws CameraAccessException { |
| String[] ids = mCameraManager.getCameraIdList(); |
| for (String id : ids) { |
| CameraCharacteristics c = mCameraManager.getCameraCharacteristics(id); |
| Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE); |
| Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING); |
| if (flashAvailable != null && flashAvailable |
| && lensFacing != null && lensFacing == CameraCharacteristics.LENS_FACING_BACK) { |
| return id; |
| } |
| } |
| return null; |
| } |
| |
| private void dispatchModeChanged(boolean enabled) { |
| dispatchListeners(DISPATCH_CHANGED, enabled); |
| } |
| |
| private void dispatchError() { |
| dispatchListeners(DISPATCH_CHANGED, false /* argument (ignored) */); |
| } |
| |
| private void dispatchAvailabilityChanged(boolean available) { |
| dispatchListeners(DISPATCH_AVAILABILITY_CHANGED, available); |
| } |
| |
| private void dispatchListeners(int message, boolean argument) { |
| synchronized (mListeners) { |
| final int N = mListeners.size(); |
| boolean cleanup = false; |
| for (int i = 0; i < N; i++) { |
| FlashlightListener l = mListeners.get(i).get(); |
| if (l != null) { |
| if (message == DISPATCH_ERROR) { |
| l.onFlashlightError(); |
| } else if (message == DISPATCH_CHANGED) { |
| l.onFlashlightChanged(argument); |
| } else if (message == DISPATCH_AVAILABILITY_CHANGED) { |
| l.onFlashlightAvailabilityChanged(argument); |
| } |
| } else { |
| cleanup = true; |
| } |
| } |
| if (cleanup) { |
| cleanUpListenersLocked(null); |
| } |
| } |
| } |
| |
| private void cleanUpListenersLocked(FlashlightListener listener) { |
| for (int i = mListeners.size() - 1; i >= 0; i--) { |
| FlashlightListener found = mListeners.get(i).get(); |
| if (found == null || found == listener) { |
| mListeners.remove(i); |
| } |
| } |
| } |
| |
| private final CameraManager.TorchCallback mTorchCallback = |
| new CameraManager.TorchCallback() { |
| |
| @Override |
| public void onTorchModeUnavailable(String cameraId) { |
| if (TextUtils.equals(cameraId, mCameraId)) { |
| setCameraAvailable(false); |
| Settings.Secure.putInt( |
| mContext.getContentResolver(), Settings.Secure.FLASHLIGHT_AVAILABLE, 0); |
| |
| } |
| } |
| |
| @Override |
| public void onTorchModeChanged(String cameraId, boolean enabled) { |
| if (TextUtils.equals(cameraId, mCameraId)) { |
| setCameraAvailable(true); |
| setTorchMode(enabled); |
| Settings.Secure.putInt( |
| mContext.getContentResolver(), Settings.Secure.FLASHLIGHT_AVAILABLE, 1); |
| Settings.Secure.putInt( |
| mContext.getContentResolver(), Secure.FLASHLIGHT_ENABLED, enabled ? 1 : 0); |
| mContext.sendBroadcast(new Intent(ACTION_FLASHLIGHT_CHANGED)); |
| } |
| } |
| |
| private void setCameraAvailable(boolean available) { |
| boolean changed; |
| synchronized (FlashlightControllerImpl.this) { |
| changed = mTorchAvailable != available; |
| mTorchAvailable = available; |
| } |
| if (changed) { |
| if (DEBUG) Log.d(TAG, "dispatchAvailabilityChanged(" + available + ")"); |
| dispatchAvailabilityChanged(available); |
| } |
| } |
| |
| private void setTorchMode(boolean enabled) { |
| boolean changed; |
| synchronized (FlashlightControllerImpl.this) { |
| changed = mFlashlightEnabled != enabled; |
| mFlashlightEnabled = enabled; |
| } |
| if (changed) { |
| if (DEBUG) Log.d(TAG, "dispatchModeChanged(" + enabled + ")"); |
| dispatchModeChanged(enabled); |
| } |
| } |
| }; |
| |
| public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| pw.println("FlashlightController state:"); |
| |
| pw.print(" mCameraId="); |
| pw.println(mCameraId); |
| pw.print(" mFlashlightEnabled="); |
| pw.println(mFlashlightEnabled); |
| pw.print(" mTorchAvailable="); |
| pw.println(mTorchAvailable); |
| } |
| } |