diff options
Diffstat (limited to 'services/core/java/com/android/server/GestureLauncherService.java')
| -rw-r--r-- | services/core/java/com/android/server/GestureLauncherService.java | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/GestureLauncherService.java b/services/core/java/com/android/server/GestureLauncherService.java new file mode 100644 index 0000000..2aa0390 --- /dev/null +++ b/services/core/java/com/android/server/GestureLauncherService.java @@ -0,0 +1,401 @@ +/* + * 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.provider.Settings; +import android.util.Slog; +import android.view.KeyEvent; + +import com.android.internal.logging.MetricsLogger; +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; + private static final long CAMERA_POWER_DOUBLE_TAP_MIN_TIME_MS = 120; + + /** 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) { + boolean launched = false; + boolean intercept = false; + long doubleTapInterval; + synchronized (this) { + doubleTapInterval = event.getEventTime() - mLastPowerDown; + if (mCameraDoubleTapPowerEnabled + && doubleTapInterval < CAMERA_POWER_DOUBLE_TAP_MAX_TIME_MS + && doubleTapInterval > CAMERA_POWER_DOUBLE_TAP_MIN_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, MetricsLogger.ACTION_DOUBLE_TAP_POWER_CAMERA_GESTURE, + (int) doubleTapInterval); + } + } + MetricsLogger.histogram(mContext, "power_double_tap_interval", (int) doubleTapInterval); + return intercept && launched; + } + + /** + * @return true if camera was launched, false otherwise. + */ + private boolean handleCameraLaunchGesture(boolean useWakelock, int source) { + boolean userSetupComplete = Settings.Secure.getInt(mContext.getContentResolver(), + Settings.Secure.USER_SETUP_COMPLETE, 0) != 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, MetricsLogger.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; + } + } +} |