| /* |
| * 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.telecom; |
| |
| import android.app.UiModeManager; |
| import android.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.res.Configuration; |
| import android.hardware.Sensor; |
| import android.hardware.SensorEvent; |
| import android.hardware.SensorEventListener; |
| import android.hardware.SensorManager; |
| import android.telecom.Log; |
| |
| import java.util.Set; |
| import java.util.concurrent.CopyOnWriteArraySet; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * Provides various system states to the rest of the telecom codebase. |
| */ |
| public class SystemStateHelper { |
| public static interface SystemStateListener { |
| public void onCarModeChanged(boolean isCarMode); |
| } |
| |
| private final Context mContext; |
| private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| Log.startSession("SSP.oR"); |
| try { |
| String action = intent.getAction(); |
| if (UiModeManager.ACTION_ENTER_CAR_MODE.equals(action)) { |
| onEnterCarMode(); |
| } else if (UiModeManager.ACTION_EXIT_CAR_MODE.equals(action)) { |
| onExitCarMode(); |
| } else { |
| Log.w(this, "Unexpected intent received: %s", intent.getAction()); |
| } |
| } finally { |
| Log.endSession(); |
| } |
| } |
| }; |
| |
| private Set<SystemStateListener> mListeners = new CopyOnWriteArraySet<>(); |
| private boolean mIsCarMode; |
| |
| public SystemStateHelper(Context context) { |
| mContext = context; |
| |
| IntentFilter intentFilter = new IntentFilter(UiModeManager.ACTION_ENTER_CAR_MODE); |
| intentFilter.addAction(UiModeManager.ACTION_EXIT_CAR_MODE); |
| mContext.registerReceiver(mBroadcastReceiver, intentFilter); |
| Log.i(this, "Registering car mode receiver: %s", intentFilter); |
| |
| mIsCarMode = getSystemCarMode(); |
| } |
| |
| public void addListener(SystemStateListener listener) { |
| if (listener != null) { |
| mListeners.add(listener); |
| } |
| } |
| |
| public boolean removeListener(SystemStateListener listener) { |
| return mListeners.remove(listener); |
| } |
| |
| public boolean isCarMode() { |
| return mIsCarMode; |
| } |
| |
| public boolean isDeviceAtEar() { |
| return isDeviceAtEar(mContext); |
| } |
| |
| /** |
| * Returns a guess whether the phone is up to the user's ear. Use the proximity sensor and |
| * the gravity sensor to make a guess |
| * @return true if the proximity sensor is activated, the magnitude of gravity in directions |
| * parallel to the screen is greater than some configurable threshold, and the |
| * y-component of gravity isn't less than some other configurable threshold. |
| */ |
| public static boolean isDeviceAtEar(Context context) { |
| SensorManager sm = context.getSystemService(SensorManager.class); |
| if (sm == null) { |
| return false; |
| } |
| Sensor grav = sm.getDefaultSensor(Sensor.TYPE_GRAVITY); |
| Sensor proximity = sm.getDefaultSensor(Sensor.TYPE_PROXIMITY); |
| if (grav == null || proximity == null) { |
| return false; |
| } |
| |
| AtomicBoolean result = new AtomicBoolean(true); |
| CountDownLatch gravLatch = new CountDownLatch(1); |
| CountDownLatch proxLatch = new CountDownLatch(1); |
| |
| final double xyGravityThreshold = context.getResources().getFloat( |
| R.dimen.device_on_ear_xy_gravity_threshold); |
| final double yGravityNegativeThreshold = context.getResources().getFloat( |
| R.dimen.device_on_ear_y_gravity_negative_threshold); |
| |
| SensorEventListener listener = new SensorEventListener() { |
| @Override |
| public void onSensorChanged(SensorEvent event) { |
| if (event.sensor.getType() == Sensor.TYPE_GRAVITY) { |
| if (gravLatch.getCount() == 0) { |
| return; |
| } |
| double xyMag = Math.sqrt(event.values[0] * event.values[0] |
| + event.values[1] * event.values[1]); |
| if (xyMag < xyGravityThreshold |
| || event.values[1] < yGravityNegativeThreshold) { |
| result.set(false); |
| } |
| gravLatch.countDown(); |
| } else if (event.sensor.getType() == Sensor.TYPE_PROXIMITY) { |
| if (proxLatch.getCount() == 0) { |
| return; |
| } |
| if (event.values[0] >= proximity.getMaximumRange()) { |
| result.set(false); |
| } |
| proxLatch.countDown(); |
| } |
| } |
| |
| @Override |
| public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| } |
| }; |
| |
| try { |
| sm.registerListener(listener, grav, SensorManager.SENSOR_DELAY_FASTEST); |
| sm.registerListener(listener, proximity, SensorManager.SENSOR_DELAY_FASTEST); |
| boolean accelValid = gravLatch.await(100, TimeUnit.MILLISECONDS); |
| boolean proxValid = proxLatch.await(100, TimeUnit.MILLISECONDS); |
| if (accelValid && proxValid) { |
| return result.get(); |
| } else { |
| Log.w(SystemStateHelper.class.getSimpleName(), |
| "Timed out waiting for sensors: %b %b", accelValid, proxValid); |
| return false; |
| } |
| } catch (InterruptedException e) { |
| return false; |
| } finally { |
| sm.unregisterListener(listener); |
| } |
| } |
| |
| private void onEnterCarMode() { |
| if (!mIsCarMode) { |
| Log.i(this, "Entering carmode"); |
| mIsCarMode = true; |
| notifyCarMode(); |
| } |
| } |
| |
| private void onExitCarMode() { |
| if (mIsCarMode) { |
| Log.i(this, "Exiting carmode"); |
| mIsCarMode = false; |
| notifyCarMode(); |
| } |
| } |
| |
| private void notifyCarMode() { |
| for (SystemStateListener listener : mListeners) { |
| listener.onCarModeChanged(mIsCarMode); |
| } |
| } |
| |
| /** |
| * Checks the system for the current car mode. |
| * |
| * @return True if in car mode, false otherwise. |
| */ |
| private boolean getSystemCarMode() { |
| UiModeManager uiModeManager = |
| (UiModeManager) mContext.getSystemService(Context.UI_MODE_SERVICE); |
| |
| if (uiModeManager != null) { |
| return uiModeManager.getCurrentModeType() == Configuration.UI_MODE_TYPE_CAR; |
| } |
| |
| return false; |
| } |
| } |