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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright (C) 2012 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.hardware;
import android.os.Looper;
import android.os.Process;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.util.SparseArray;
import android.util.SparseBooleanArray;
import android.util.SparseIntArray;
import java.util.ArrayList;
import java.util.List;
/**
* Sensor manager implementation that communicates with the built-in
* system sensors.
*
* @hide
*/
public class SystemSensorManager extends SensorManager {
private static final int SENSOR_DISABLE = -1;
private static boolean sSensorModuleInitialized = false;
private static ArrayList sFullSensorsList = new ArrayList();
/* The thread and the sensor list are global to the process
* but the actual thread is spawned on demand */
private static SensorThread sSensorThread;
private static int sQueue;
// Used within this module from outside SensorManager, don't make private
static SparseArray sHandleToSensor = new SparseArray();
static final ArrayList sListeners =
new ArrayList();
// Common pool of sensor events.
static SensorEventPool sPool;
// Looper associated with the context in which this instance was created.
final Looper mMainLooper;
/*-----------------------------------------------------------------------*/
static private class SensorThread {
Thread mThread;
boolean mSensorsReady;
SensorThread() {
}
@Override
protected void finalize() {
}
// must be called with sListeners lock
boolean startLocked() {
try {
if (mThread == null) {
mSensorsReady = false;
SensorThreadRunnable runnable = new SensorThreadRunnable();
Thread thread = new Thread(runnable, SensorThread.class.getName());
thread.start();
synchronized (runnable) {
while (mSensorsReady == false) {
runnable.wait();
}
}
mThread = thread;
}
} catch (InterruptedException e) {
}
return mThread == null ? false : true;
}
private class SensorThreadRunnable implements Runnable {
SensorThreadRunnable() {
}
private boolean open() {
// NOTE: this cannot synchronize on sListeners, since
// it's held in the main thread at least until we
// return from here.
sQueue = sensors_create_queue();
return true;
}
public void run() {
//Log.d(TAG, "entering main sensor thread");
final float[] values = new float[3];
final int[] status = new int[1];
final long timestamp[] = new long[1];
Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_DISPLAY);
if (!open()) {
return;
}
synchronized (this) {
// we've open the driver, we're ready to open the sensors
mSensorsReady = true;
this.notify();
}
while (true) {
// wait for an event
final int sensor = sensors_data_poll(sQueue, values, status, timestamp);
int accuracy = status[0];
synchronized (sListeners) {
if (sensor == -1 || sListeners.isEmpty()) {
// we lost the connection to the event stream. this happens
// when the last listener is removed or if there is an error
if (sensor == -1 && !sListeners.isEmpty()) {
// log a warning in case of abnormal termination
Log.e(TAG, "_sensors_data_poll() failed, we bail out: sensors=" + sensor);
}
// we have no more listeners or polling failed, terminate the thread
sensors_destroy_queue(sQueue);
sQueue = 0;
mThread = null;
break;
}
final Sensor sensorObject = sHandleToSensor.get(sensor);
if (sensorObject != null) {
// report the sensor event to all listeners that
// care about it.
final int size = sListeners.size();
for (int i=0 ; i mSensorList = new ArrayList();
private final Handler mHandler;
public SparseBooleanArray mSensors = new SparseBooleanArray();
public SparseBooleanArray mFirstEvent = new SparseBooleanArray();
public SparseIntArray mSensorAccuracies = new SparseIntArray();
ListenerDelegate(SensorEventListener listener, Sensor sensor, Handler handler) {
mSensorEventListener = listener;
Looper looper = (handler != null) ? handler.getLooper() : mMainLooper;
// currently we create one Handler instance per listener, but we could
// have one per looper (we'd need to pass the ListenerDelegate
// instance to handleMessage and keep track of them separately).
mHandler = new Handler(looper) {
@Override
public void handleMessage(Message msg) {
final SensorEvent t = (SensorEvent)msg.obj;
final int handle = t.sensor.getHandle();
switch (t.sensor.getType()) {
// Only report accuracy for sensors that support it.
case Sensor.TYPE_MAGNETIC_FIELD:
case Sensor.TYPE_ORIENTATION:
// call onAccuracyChanged() only if the value changes
final int accuracy = mSensorAccuracies.get(handle);
if ((t.accuracy >= 0) && (accuracy != t.accuracy)) {
mSensorAccuracies.put(handle, t.accuracy);
mSensorEventListener.onAccuracyChanged(t.sensor, t.accuracy);
}
break;
default:
// For other sensors, just report the accuracy once
if (mFirstEvent.get(handle) == false) {
mFirstEvent.put(handle, true);
mSensorEventListener.onAccuracyChanged(
t.sensor, SENSOR_STATUS_ACCURACY_HIGH);
}
break;
}
mSensorEventListener.onSensorChanged(t);
sPool.returnToPool(t);
}
};
addSensor(sensor);
}
Object getListener() {
return mSensorEventListener;
}
void addSensor(Sensor sensor) {
mSensors.put(sensor.getHandle(), true);
mSensorList.add(sensor);
}
int removeSensor(Sensor sensor) {
mSensors.delete(sensor.getHandle());
mSensorList.remove(sensor);
return mSensors.size();
}
boolean hasSensor(Sensor sensor) {
return mSensors.get(sensor.getHandle());
}
List getSensors() {
return mSensorList;
}
void onSensorChangedLocked(Sensor sensor, float[] values, long[] timestamp, int accuracy) {
SensorEvent t = sPool.getFromPool();
final float[] v = t.values;
v[0] = values[0];
v[1] = values[1];
v[2] = values[2];
t.timestamp = timestamp[0];
t.accuracy = accuracy;
t.sensor = sensor;
Message msg = Message.obtain();
msg.what = 0;
msg.obj = t;
msg.setAsynchronous(true);
mHandler.sendMessage(msg);
}
}
/**
* {@hide}
*/
public SystemSensorManager(Looper mainLooper) {
mMainLooper = mainLooper;
synchronized(sListeners) {
if (!sSensorModuleInitialized) {
sSensorModuleInitialized = true;
nativeClassInit();
// initialize the sensor list
sensors_module_init();
final ArrayList fullList = sFullSensorsList;
int i = 0;
do {
Sensor sensor = new Sensor();
i = sensors_module_get_next_sensor(sensor, i);
if (i>=0) {
//Log.d(TAG, "found sensor: " + sensor.getName() +
// ", handle=" + sensor.getHandle());
fullList.add(sensor);
sHandleToSensor.append(sensor.getHandle(), sensor);
}
} while (i>0);
sPool = new SensorEventPool( sFullSensorsList.size()*2 );
sSensorThread = new SensorThread();
}
}
}
/** @hide */
@Override
protected List getFullSensorList() {
return sFullSensorsList;
}
private boolean enableSensorLocked(Sensor sensor, int delay) {
boolean result = false;
for (ListenerDelegate i : sListeners) {
if (i.hasSensor(sensor)) {
String name = sensor.getName();
int handle = sensor.getHandle();
result = sensors_enable_sensor(sQueue, name, handle, delay);
break;
}
}
return result;
}
private boolean disableSensorLocked(Sensor sensor) {
for (ListenerDelegate i : sListeners) {
if (i.hasSensor(sensor)) {
// not an error, it's just that this sensor is still in use
return true;
}
}
String name = sensor.getName();
int handle = sensor.getHandle();
return sensors_enable_sensor(sQueue, name, handle, SENSOR_DISABLE);
}
/** @hide */
@Override
protected boolean registerListenerImpl(SensorEventListener listener, Sensor sensor,
int delay, Handler handler) {
boolean result = true;
synchronized (sListeners) {
// look for this listener in our list
ListenerDelegate l = null;
for (ListenerDelegate i : sListeners) {
if (i.getListener() == listener) {
l = i;
break;
}
}
// if we don't find it, add it to the list
if (l == null) {
l = new ListenerDelegate(listener, sensor, handler);
sListeners.add(l);
// if the list is not empty, start our main thread
if (!sListeners.isEmpty()) {
if (sSensorThread.startLocked()) {
if (!enableSensorLocked(sensor, delay)) {
// oops. there was an error
sListeners.remove(l);
result = false;
}
} else {
// there was an error, remove the listener
sListeners.remove(l);
result = false;
}
} else {
// weird, we couldn't add the listener
result = false;
}
} else if (!l.hasSensor(sensor)) {
l.addSensor(sensor);
if (!enableSensorLocked(sensor, delay)) {
// oops. there was an error
l.removeSensor(sensor);
result = false;
}
}
}
return result;
}
/** @hide */
@Override
protected void unregisterListenerImpl(SensorEventListener listener, Sensor sensor) {
synchronized (sListeners) {
final int size = sListeners.size();
for (int i=0 ; i