| /* |
| * Copyright (C) 2010 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 android.webkit; |
| |
| import android.content.Context; |
| import android.hardware.Sensor; |
| import android.hardware.SensorEvent; |
| import android.hardware.SensorEventListener; |
| import android.hardware.SensorManager; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.webkit.DeviceMotionAndOrientationManager; |
| import java.lang.Runnable; |
| import java.util.List; |
| |
| |
| final class DeviceMotionService implements SensorEventListener { |
| private DeviceMotionAndOrientationManager mManager; |
| private boolean mIsRunning; |
| private Handler mHandler; |
| private SensorManager mSensorManager; |
| private Context mContext; |
| private boolean mHaveSentErrorEvent; |
| private Runnable mUpdateRunnable; |
| private float mLastAcceleration[]; |
| |
| private static final int INTERVAL_MILLIS = 100; |
| |
| public DeviceMotionService(DeviceMotionAndOrientationManager manager, Context context) { |
| mManager = manager; |
| assert(mManager != null); |
| mContext = context; |
| assert(mContext != null); |
| } |
| |
| public void start() { |
| mIsRunning = true; |
| registerForSensor(); |
| } |
| |
| public void stop() { |
| mIsRunning = false; |
| stopSendingUpdates(); |
| unregisterFromSensor(); |
| } |
| |
| public void suspend() { |
| if (mIsRunning) { |
| stopSendingUpdates(); |
| unregisterFromSensor(); |
| } |
| } |
| |
| public void resume() { |
| if (mIsRunning) { |
| registerForSensor(); |
| } |
| } |
| |
| private void sendErrorEvent() { |
| assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| // The spec requires that each listener receives the error event only once. |
| if (mHaveSentErrorEvent) |
| return; |
| mHaveSentErrorEvent = true; |
| createHandler(); |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| if (mIsRunning) { |
| // The special case of all nulls is used to signify a failure to get data. |
| mManager.onMotionChange(null, null, null, 0.0); |
| } |
| } |
| }); |
| } |
| |
| private void createHandler() { |
| if (mHandler != null) { |
| return; |
| } |
| |
| mHandler = new Handler(); |
| mUpdateRunnable = new Runnable() { |
| @Override |
| public void run() { |
| mManager.onMotionChange(new Double(mLastAcceleration[0]), |
| new Double(mLastAcceleration[1]), new Double(mLastAcceleration[2]), |
| INTERVAL_MILLIS); |
| mHandler.postDelayed(mUpdateRunnable, INTERVAL_MILLIS); |
| // Now that we have successfully sent some data, reset whether we've sent an error. |
| mHaveSentErrorEvent = false; |
| } |
| }; |
| } |
| |
| private void startSendingUpdates() { |
| createHandler(); |
| mUpdateRunnable.run(); |
| } |
| |
| private void stopSendingUpdates() { |
| mHandler.removeCallbacks(mUpdateRunnable); |
| mLastAcceleration = null; |
| } |
| |
| private void registerForSensor() { |
| if (!registerForAccelerometerSensor()) { |
| sendErrorEvent(); |
| } |
| } |
| |
| private SensorManager getSensorManager() { |
| assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| if (mSensorManager == null) { |
| mSensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE); |
| } |
| return mSensorManager; |
| } |
| |
| private boolean registerForAccelerometerSensor() { |
| List<Sensor> sensors = getSensorManager().getSensorList(Sensor.TYPE_ACCELEROMETER); |
| if (sensors.isEmpty()) { |
| return false; |
| } |
| createHandler(); |
| // TODO: Consider handling multiple sensors. |
| return getSensorManager().registerListener( |
| this, sensors.get(0), SensorManager.SENSOR_DELAY_UI, mHandler); |
| } |
| |
| private void unregisterFromSensor() { |
| getSensorManager().unregisterListener(this); |
| } |
| |
| /** |
| * SensorEventListener implementation. |
| * Callbacks happen on the thread on which we registered - the WebCore thread. |
| */ |
| public void onSensorChanged(SensorEvent event) { |
| assert(event.values.length == 3); |
| assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| assert(event.sensor.getType() == Sensor.TYPE_ACCELEROMETER); |
| |
| boolean firstData = mLastAcceleration == null; |
| mLastAcceleration = event.values; |
| if (firstData) { |
| startSendingUpdates(); |
| } |
| } |
| |
| public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| } |
| } |