Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.webkit; |
| 18 | |
Steve Block | bb9db22 | 2010-08-18 11:12:07 +0100 | [diff] [blame] | 19 | import android.content.Context; |
| 20 | import android.hardware.Sensor; |
| 21 | import android.hardware.SensorEvent; |
| 22 | import android.hardware.SensorEventListener; |
| 23 | import android.hardware.SensorManager; |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 24 | import android.os.Handler; |
| 25 | import android.webkit.DeviceOrientationManager; |
| 26 | import java.lang.Runnable; |
Steve Block | bb9db22 | 2010-08-18 11:12:07 +0100 | [diff] [blame] | 27 | import java.util.List; |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 28 | |
| 29 | |
Steve Block | bb9db22 | 2010-08-18 11:12:07 +0100 | [diff] [blame] | 30 | final class DeviceOrientationService implements SensorEventListener { |
| 31 | // The gravity vector expressed in the body frame. |
| 32 | private float[] mGravityVector; |
| 33 | // The geomagnetic vector expressed in the body frame. |
| 34 | private float[] mMagneticFieldVector; |
| 35 | |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 36 | private DeviceOrientationManager mManager; |
| 37 | private boolean mIsRunning; |
| 38 | private Handler mHandler; |
Steve Block | bb9db22 | 2010-08-18 11:12:07 +0100 | [diff] [blame] | 39 | private SensorManager mSensorManager; |
| 40 | private Context mContext; |
| 41 | private Double mAlpha; |
| 42 | private Double mBeta; |
| 43 | private Double mGamma; |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 44 | |
Steve Block | bb9db22 | 2010-08-18 11:12:07 +0100 | [diff] [blame] | 45 | private static final double DELTA_DEGRESS = 1.0; |
| 46 | |
| 47 | public DeviceOrientationService(DeviceOrientationManager manager, Context context) { |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 48 | mManager = manager; |
| 49 | assert(mManager != null); |
Steve Block | bb9db22 | 2010-08-18 11:12:07 +0100 | [diff] [blame] | 50 | mContext = context; |
| 51 | assert(mContext != null); |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | public void start() { |
| 55 | mIsRunning = true; |
| 56 | registerForSensors(); |
| 57 | } |
| 58 | |
| 59 | public void stop() { |
| 60 | mIsRunning = false; |
| 61 | unregisterFromSensors(); |
| 62 | } |
| 63 | |
| 64 | public void suspend() { |
| 65 | if (mIsRunning) { |
| 66 | unregisterFromSensors(); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | public void resume() { |
| 71 | if (mIsRunning) { |
| 72 | registerForSensors(); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | private void sendErrorEvent() { |
| 77 | assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 78 | mHandler.post(new Runnable() { |
| 79 | @Override |
| 80 | public void run() { |
| 81 | assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| 82 | if (mIsRunning) { |
| 83 | mManager.onOrientationChange(null, null, null); |
| 84 | } |
| 85 | } |
| 86 | }); |
| 87 | } |
| 88 | |
| 89 | private void registerForSensors() { |
Steve Block | bb9db22 | 2010-08-18 11:12:07 +0100 | [diff] [blame] | 90 | if (mHandler == null) { |
| 91 | mHandler = new Handler(); |
| 92 | } |
| 93 | if (!registerForAccelerometerSensor() || !registerForMagneticFieldSensor()) { |
| 94 | unregisterFromSensors(); |
| 95 | sendErrorEvent(); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | private void getOrientationUsingGetRotationMatrix() { |
| 100 | if (mGravityVector == null || mMagneticFieldVector == null) { |
| 101 | return; |
| 102 | } |
| 103 | |
| 104 | // Get the rotation matrix. |
| 105 | // The rotation matrix that transforms from the body frame to the earth frame. |
| 106 | float[] deviceRotationMatrix = new float[9]; |
| 107 | if (!SensorManager.getRotationMatrix( |
| 108 | deviceRotationMatrix, null, mGravityVector, mMagneticFieldVector)) { |
| 109 | return; |
| 110 | } |
| 111 | |
| 112 | // Convert rotation matrix to rotation angles. |
| 113 | // Assuming that the rotations are appied in the order listed at |
| 114 | // http://developer.android.com/reference/android/hardware/SensorEvent.html#values |
| 115 | // the rotations are applied about the same axes and in the same order as required by the |
| 116 | // API. The only conversions are sign changes as follows. |
| 117 | // The angles are in radians |
| 118 | float[] rotationAngles = new float[3]; |
| 119 | SensorManager.getOrientation(deviceRotationMatrix, rotationAngles); |
| 120 | double alpha = Math.toDegrees(-rotationAngles[0]) - 90.0; |
| 121 | while (alpha < 0.0) { alpha += 360.0; } // [0, 360) |
| 122 | double beta = Math.toDegrees(-rotationAngles[1]); |
| 123 | while (beta < -180.0) { beta += 360.0; } // [-180, 180) |
| 124 | double gamma = Math.toDegrees(rotationAngles[2]); |
| 125 | while (gamma < -90.0) { gamma += 360.0; } // [-90, 90) |
| 126 | |
| 127 | maybeSendChange(alpha, beta, gamma); |
| 128 | } |
| 129 | |
| 130 | private SensorManager getSensorManager() { |
| 131 | assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| 132 | if (mSensorManager == null) { |
| 133 | mSensorManager = (SensorManager) mContext.getSystemService(Context.SENSOR_SERVICE); |
| 134 | } |
| 135 | return mSensorManager; |
| 136 | } |
| 137 | |
| 138 | private boolean registerForAccelerometerSensor() { |
| 139 | List<Sensor> sensors = getSensorManager().getSensorList(Sensor.TYPE_ACCELEROMETER); |
| 140 | if (sensors.isEmpty()) { |
| 141 | return false; |
| 142 | } |
| 143 | // TODO: Consider handling multiple sensors. |
| 144 | return getSensorManager().registerListener( |
| 145 | this, sensors.get(0), SensorManager.SENSOR_DELAY_FASTEST, mHandler); |
| 146 | } |
| 147 | |
| 148 | private boolean registerForMagneticFieldSensor() { |
| 149 | List<Sensor> sensors = getSensorManager().getSensorList(Sensor.TYPE_MAGNETIC_FIELD); |
| 150 | if (sensors.isEmpty()) { |
| 151 | return false; |
| 152 | } |
| 153 | // TODO: Consider handling multiple sensors. |
| 154 | return getSensorManager().registerListener( |
| 155 | this, sensors.get(0), SensorManager.SENSOR_DELAY_FASTEST, mHandler); |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | private void unregisterFromSensors() { |
Steve Block | bb9db22 | 2010-08-18 11:12:07 +0100 | [diff] [blame] | 159 | getSensorManager().unregisterListener(this); |
| 160 | } |
| 161 | |
| 162 | private void maybeSendChange(double alpha, double beta, double gamma) { |
| 163 | assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| 164 | if (mAlpha == null || mBeta == null || mGamma == null |
| 165 | || Math.abs(alpha - mAlpha) > DELTA_DEGRESS |
| 166 | || Math.abs(beta - mBeta) > DELTA_DEGRESS |
| 167 | || Math.abs(gamma - mGamma) > DELTA_DEGRESS) { |
| 168 | mAlpha = alpha; |
| 169 | mBeta = beta; |
| 170 | mGamma = gamma; |
| 171 | mManager.onOrientationChange(mAlpha, mBeta, mGamma); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * SensorEventListener implementation. |
| 177 | * Callbacks happen on the thread on which we registered - the WebCore thread. |
| 178 | */ |
| 179 | public void onSensorChanged(SensorEvent event) { |
| 180 | assert(event.values.length == 3); |
| 181 | assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
| 182 | |
| 183 | if (!mIsRunning) { |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | switch (event.sensor.getType()) { |
| 188 | case Sensor.TYPE_ACCELEROMETER: |
| 189 | if (mGravityVector == null) { |
| 190 | mGravityVector = new float[3]; |
| 191 | } |
| 192 | mGravityVector[0] = event.values[0]; |
| 193 | mGravityVector[1] = event.values[1]; |
| 194 | mGravityVector[2] = event.values[2]; |
| 195 | getOrientationUsingGetRotationMatrix(); |
| 196 | break; |
| 197 | case Sensor.TYPE_MAGNETIC_FIELD: |
| 198 | if (mMagneticFieldVector == null) { |
| 199 | mMagneticFieldVector = new float[3]; |
| 200 | } |
| 201 | mMagneticFieldVector[0] = event.values[0]; |
| 202 | mMagneticFieldVector[1] = event.values[1]; |
| 203 | mMagneticFieldVector[2] = event.values[2]; |
| 204 | getOrientationUsingGetRotationMatrix(); |
| 205 | break; |
| 206 | default: |
| 207 | assert(false); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| 212 | assert WebViewCore.THREAD_NAME.equals(Thread.currentThread().getName()); |
Steve Block | c43565b | 2010-08-11 13:12:37 +0100 | [diff] [blame] | 213 | } |
| 214 | } |