| /* |
| * Copyright (C) 2015 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.server; |
| |
| import android.app.ActivityManager; |
| import android.app.StatusBarManager; |
| import android.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.res.Resources; |
| import android.database.ContentObserver; |
| import android.hardware.Sensor; |
| import android.hardware.SensorEvent; |
| import android.hardware.SensorEventListener; |
| import android.hardware.SensorManager; |
| import android.os.Handler; |
| import android.os.PowerManager; |
| import android.os.PowerManager.WakeLock; |
| import android.os.SystemClock; |
| import android.os.SystemProperties; |
| import android.os.UserHandle; |
| import android.provider.Settings; |
| import android.util.MutableBoolean; |
| import android.util.Slog; |
| import android.view.KeyEvent; |
| |
| import com.android.internal.logging.MetricsLogger; |
| import com.android.internal.logging.MetricsProto.MetricsEvent; |
| import com.android.server.statusbar.StatusBarManagerInternal; |
| |
| /** |
| * The service that listens for gestures detected in sensor firmware and starts the intent |
| * accordingly. |
| * <p>For now, only camera launch gesture is supported, and in the future, more gestures can be |
| * added.</p> |
| * @hide |
| */ |
| public class GestureLauncherService extends SystemService { |
| private static final boolean DBG = false; |
| private static final String TAG = "GestureLauncherService"; |
| |
| /** |
| * Time in milliseconds in which the power button must be pressed twice so it will be considered |
| * as a camera launch. |
| */ |
| private static final long CAMERA_POWER_DOUBLE_TAP_MAX_TIME_MS = 300; |
| |
| /** The listener that receives the gesture event. */ |
| private final GestureEventListener mGestureListener = new GestureEventListener(); |
| |
| private Sensor mCameraLaunchSensor; |
| private Context mContext; |
| |
| /** The wake lock held when a gesture is detected. */ |
| private WakeLock mWakeLock; |
| private boolean mRegistered; |
| private int mUserId; |
| |
| // Below are fields used for event logging only. |
| /** Elapsed real time when the camera gesture is turned on. */ |
| private long mCameraGestureOnTimeMs = 0L; |
| |
| /** Elapsed real time when the last camera gesture was detected. */ |
| private long mCameraGestureLastEventTime = 0L; |
| |
| /** |
| * How long the sensor 1 has been turned on since camera launch sensor was |
| * subscribed to and when the last camera launch gesture was detected. |
| * <p>Sensor 1 is the main sensor used to detect camera launch gesture.</p> |
| */ |
| private long mCameraGestureSensor1LastOnTimeMs = 0L; |
| |
| /** |
| * If applicable, how long the sensor 2 has been turned on since camera |
| * launch sensor was subscribed to and when the last camera launch |
| * gesture was detected. |
| * <p>Sensor 2 is the secondary sensor used to detect camera launch gesture. |
| * This is optional and if only sensor 1 is used for detect camera launch |
| * gesture, this value would always be 0.</p> |
| */ |
| private long mCameraGestureSensor2LastOnTimeMs = 0L; |
| |
| /** |
| * Extra information about the event when the last camera launch gesture |
| * was detected. |
| */ |
| private int mCameraLaunchLastEventExtra = 0; |
| |
| /** |
| * Whether camera double tap power button gesture is currently enabled; |
| */ |
| private boolean mCameraDoubleTapPowerEnabled; |
| private long mLastPowerDown; |
| |
| public GestureLauncherService(Context context) { |
| super(context); |
| mContext = context; |
| } |
| |
| public void onStart() { |
| LocalServices.addService(GestureLauncherService.class, this); |
| } |
| |
| public void onBootPhase(int phase) { |
| if (phase == PHASE_THIRD_PARTY_APPS_CAN_START) { |
| Resources resources = mContext.getResources(); |
| if (!isGestureLauncherEnabled(resources)) { |
| if (DBG) Slog.d(TAG, "Gesture launcher is disabled in system properties."); |
| return; |
| } |
| |
| PowerManager powerManager = (PowerManager) mContext.getSystemService( |
| Context.POWER_SERVICE); |
| mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, |
| "GestureLauncherService"); |
| updateCameraRegistered(); |
| updateCameraDoubleTapPowerEnabled(); |
| |
| mUserId = ActivityManager.getCurrentUser(); |
| mContext.registerReceiver(mUserReceiver, new IntentFilter(Intent.ACTION_USER_SWITCHED)); |
| registerContentObservers(); |
| } |
| } |
| |
| private void registerContentObservers() { |
| mContext.getContentResolver().registerContentObserver( |
| Settings.Secure.getUriFor(Settings.Secure.CAMERA_GESTURE_DISABLED), |
| false, mSettingObserver, mUserId); |
| mContext.getContentResolver().registerContentObserver( |
| Settings.Secure.getUriFor(Settings.Secure.CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED), |
| false, mSettingObserver, mUserId); |
| } |
| |
| private void updateCameraRegistered() { |
| Resources resources = mContext.getResources(); |
| if (isCameraLaunchSettingEnabled(mContext, mUserId)) { |
| registerCameraLaunchGesture(resources); |
| } else { |
| unregisterCameraLaunchGesture(); |
| } |
| } |
| |
| private void updateCameraDoubleTapPowerEnabled() { |
| boolean enabled = isCameraDoubleTapPowerSettingEnabled(mContext, mUserId); |
| synchronized (this) { |
| mCameraDoubleTapPowerEnabled = enabled; |
| } |
| } |
| |
| private void unregisterCameraLaunchGesture() { |
| if (mRegistered) { |
| mRegistered = false; |
| mCameraGestureOnTimeMs = 0L; |
| mCameraGestureLastEventTime = 0L; |
| mCameraGestureSensor1LastOnTimeMs = 0; |
| mCameraGestureSensor2LastOnTimeMs = 0; |
| mCameraLaunchLastEventExtra = 0; |
| |
| SensorManager sensorManager = (SensorManager) mContext.getSystemService( |
| Context.SENSOR_SERVICE); |
| sensorManager.unregisterListener(mGestureListener); |
| } |
| } |
| |
| /** |
| * Registers for the camera launch gesture. |
| */ |
| private void registerCameraLaunchGesture(Resources resources) { |
| if (mRegistered) { |
| return; |
| } |
| mCameraGestureOnTimeMs = SystemClock.elapsedRealtime(); |
| mCameraGestureLastEventTime = mCameraGestureOnTimeMs; |
| SensorManager sensorManager = (SensorManager) mContext.getSystemService( |
| Context.SENSOR_SERVICE); |
| int cameraLaunchGestureId = resources.getInteger( |
| com.android.internal.R.integer.config_cameraLaunchGestureSensorType); |
| if (cameraLaunchGestureId != -1) { |
| mRegistered = false; |
| String sensorName = resources.getString( |
| com.android.internal.R.string.config_cameraLaunchGestureSensorStringType); |
| mCameraLaunchSensor = sensorManager.getDefaultSensor( |
| cameraLaunchGestureId, |
| true /*wakeUp*/); |
| |
| // Compare the camera gesture string type to that in the resource file to make |
| // sure we are registering the correct sensor. This is redundant check, it |
| // makes the code more robust. |
| if (mCameraLaunchSensor != null) { |
| if (sensorName.equals(mCameraLaunchSensor.getStringType())) { |
| mRegistered = sensorManager.registerListener(mGestureListener, |
| mCameraLaunchSensor, 0); |
| } else { |
| String message = String.format("Wrong configuration. Sensor type and sensor " |
| + "string type don't match: %s in resources, %s in the sensor.", |
| sensorName, mCameraLaunchSensor.getStringType()); |
| throw new RuntimeException(message); |
| } |
| } |
| if (DBG) Slog.d(TAG, "Camera launch sensor registered: " + mRegistered); |
| } else { |
| if (DBG) Slog.d(TAG, "Camera launch sensor is not specified."); |
| } |
| } |
| |
| public static boolean isCameraLaunchSettingEnabled(Context context, int userId) { |
| return isCameraLaunchEnabled(context.getResources()) |
| && (Settings.Secure.getIntForUser(context.getContentResolver(), |
| Settings.Secure.CAMERA_GESTURE_DISABLED, 0, userId) == 0); |
| } |
| |
| public static boolean isCameraDoubleTapPowerSettingEnabled(Context context, int userId) { |
| return isCameraDoubleTapPowerEnabled(context.getResources()) |
| && (Settings.Secure.getIntForUser(context.getContentResolver(), |
| Settings.Secure.CAMERA_DOUBLE_TAP_POWER_GESTURE_DISABLED, 0, userId) == 0); |
| } |
| |
| /** |
| * Whether to enable the camera launch gesture. |
| */ |
| public static boolean isCameraLaunchEnabled(Resources resources) { |
| boolean configSet = resources.getInteger( |
| com.android.internal.R.integer.config_cameraLaunchGestureSensorType) != -1; |
| return configSet && |
| !SystemProperties.getBoolean("gesture.disable_camera_launch", false); |
| } |
| |
| public static boolean isCameraDoubleTapPowerEnabled(Resources resources) { |
| return resources.getBoolean( |
| com.android.internal.R.bool.config_cameraDoubleTapPowerGestureEnabled); |
| } |
| |
| /** |
| * Whether GestureLauncherService should be enabled according to system properties. |
| */ |
| public static boolean isGestureLauncherEnabled(Resources resources) { |
| return isCameraLaunchEnabled(resources) || isCameraDoubleTapPowerEnabled(resources); |
| } |
| |
| public boolean interceptPowerKeyDown(KeyEvent event, boolean interactive, |
| MutableBoolean outLaunched) { |
| boolean launched = false; |
| boolean intercept = false; |
| long doubleTapInterval; |
| synchronized (this) { |
| doubleTapInterval = event.getEventTime() - mLastPowerDown; |
| if (mCameraDoubleTapPowerEnabled |
| && doubleTapInterval < CAMERA_POWER_DOUBLE_TAP_MAX_TIME_MS) { |
| launched = true; |
| intercept = interactive; |
| } |
| mLastPowerDown = event.getEventTime(); |
| } |
| if (launched) { |
| Slog.i(TAG, "Power button double tap gesture detected, launching camera. Interval=" |
| + doubleTapInterval + "ms"); |
| launched = handleCameraLaunchGesture(false /* useWakelock */, |
| StatusBarManager.CAMERA_LAUNCH_SOURCE_POWER_DOUBLE_TAP); |
| if (launched) { |
| MetricsLogger.action(mContext, MetricsEvent.ACTION_DOUBLE_TAP_POWER_CAMERA_GESTURE, |
| (int) doubleTapInterval); |
| } |
| } |
| MetricsLogger.histogram(mContext, "power_double_tap_interval", (int) doubleTapInterval); |
| outLaunched.value = launched; |
| return intercept && launched; |
| } |
| |
| /** |
| * @return true if camera was launched, false otherwise. |
| */ |
| private boolean handleCameraLaunchGesture(boolean useWakelock, int source) { |
| boolean userSetupComplete = Settings.Secure.getIntForUser(mContext.getContentResolver(), |
| Settings.Secure.USER_SETUP_COMPLETE, 0, UserHandle.USER_CURRENT) != 0; |
| if (!userSetupComplete) { |
| if (DBG) Slog.d(TAG, String.format( |
| "userSetupComplete = %s, ignoring camera launch gesture.", |
| userSetupComplete)); |
| return false; |
| } |
| if (DBG) Slog.d(TAG, String.format( |
| "userSetupComplete = %s, performing camera launch gesture.", |
| userSetupComplete)); |
| |
| if (useWakelock) { |
| // Make sure we don't sleep too early |
| mWakeLock.acquire(500L); |
| } |
| StatusBarManagerInternal service = LocalServices.getService( |
| StatusBarManagerInternal.class); |
| service.onCameraLaunchGestureDetected(source); |
| return true; |
| } |
| |
| private final BroadcastReceiver mUserReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (Intent.ACTION_USER_SWITCHED.equals(intent.getAction())) { |
| mUserId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, 0); |
| mContext.getContentResolver().unregisterContentObserver(mSettingObserver); |
| registerContentObservers(); |
| updateCameraRegistered(); |
| updateCameraDoubleTapPowerEnabled(); |
| } |
| } |
| }; |
| |
| private final ContentObserver mSettingObserver = new ContentObserver(new Handler()) { |
| public void onChange(boolean selfChange, android.net.Uri uri, int userId) { |
| if (userId == mUserId) { |
| updateCameraRegistered(); |
| updateCameraDoubleTapPowerEnabled(); |
| } |
| } |
| }; |
| |
| private final class GestureEventListener implements SensorEventListener { |
| @Override |
| public void onSensorChanged(SensorEvent event) { |
| if (!mRegistered) { |
| if (DBG) Slog.d(TAG, "Ignoring gesture event because it's unregistered."); |
| return; |
| } |
| if (event.sensor == mCameraLaunchSensor) { |
| if (DBG) { |
| float[] values = event.values; |
| Slog.d(TAG, String.format("Received a camera launch event: " + |
| "values=[%.4f, %.4f, %.4f].", values[0], values[1], values[2])); |
| } |
| if (handleCameraLaunchGesture(true /* useWakelock */, |
| StatusBarManager.CAMERA_LAUNCH_SOURCE_WIGGLE)) { |
| MetricsLogger.action(mContext, MetricsEvent.ACTION_WIGGLE_CAMERA_GESTURE); |
| trackCameraLaunchEvent(event); |
| } |
| return; |
| } |
| } |
| |
| @Override |
| public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| // Ignored. |
| } |
| |
| private void trackCameraLaunchEvent(SensorEvent event) { |
| long now = SystemClock.elapsedRealtime(); |
| long totalDuration = now - mCameraGestureOnTimeMs; |
| // values[0]: ratio between total time duration when accel is turned on and time |
| // duration since camera launch gesture is subscribed. |
| // values[1]: ratio between total time duration when gyro is turned on and time duration |
| // since camera launch gesture is subscribed. |
| // values[2]: extra information |
| float[] values = event.values; |
| |
| long sensor1OnTime = (long) (totalDuration * (double) values[0]); |
| long sensor2OnTime = (long) (totalDuration * (double) values[1]); |
| int extra = (int) values[2]; |
| |
| // We only log the difference in the event log to make aggregation easier. |
| long gestureOnTimeDiff = now - mCameraGestureLastEventTime; |
| long sensor1OnTimeDiff = sensor1OnTime - mCameraGestureSensor1LastOnTimeMs; |
| long sensor2OnTimeDiff = sensor2OnTime - mCameraGestureSensor2LastOnTimeMs; |
| int extraDiff = extra - mCameraLaunchLastEventExtra; |
| |
| // Gating against negative time difference. This doesn't usually happen, but it may |
| // happen because of numeric errors. |
| if (gestureOnTimeDiff < 0 || sensor1OnTimeDiff < 0 || sensor2OnTimeDiff < 0) { |
| if (DBG) Slog.d(TAG, "Skipped event logging because negative numbers."); |
| return; |
| } |
| |
| if (DBG) Slog.d(TAG, String.format("totalDuration: %d, sensor1OnTime: %s, " + |
| "sensor2OnTime: %d, extra: %d", |
| gestureOnTimeDiff, |
| sensor1OnTimeDiff, |
| sensor2OnTimeDiff, |
| extraDiff)); |
| EventLogTags.writeCameraGestureTriggered( |
| gestureOnTimeDiff, |
| sensor1OnTimeDiff, |
| sensor2OnTimeDiff, |
| extraDiff); |
| |
| mCameraGestureLastEventTime = now; |
| mCameraGestureSensor1LastOnTimeMs = sensor1OnTime; |
| mCameraGestureSensor2LastOnTimeMs = sensor2OnTime; |
| mCameraLaunchLastEventExtra = extra; |
| } |
| } |
| } |
