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/*
* Copyright (C) 2008 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.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.hardware.ISensorService;
import android.hardware.SensorManager;
import android.os.Binder;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.os.IBinder;
import android.os.SystemProperties;
import android.util.Config;
import android.util.Log;
import com.android.internal.R;
import java.util.ArrayList;
/**
* Class that manages the device's sensors. It register clients and activate
* the needed sensors. The sensor events themselves are not broadcasted from
* this service, instead, a file descriptor is provided to each client they
* can read events from.
*/
class SensorService extends ISensorService.Stub {
private static final int SENSOR_NOTIFICATION_ACCURACY_LEVEL = 1;
private static final String TAG = SensorService.class.getSimpleName();
private static final boolean DEBUG = false;
private static final boolean localLOGV = DEBUG ? Config.LOGD : Config.LOGV;
private static final int SENSOR_DISABLE = -1;
private NotificationManager mNotificationManager;
private int mCompassAccuracy = -1;
private final Context mContext;
private final class Listener implements IBinder.DeathRecipient {
final IBinder mListener;
int mSensors = 0;
int mDelay = 0x7FFFFFFF;
Listener(IBinder listener) {
mListener = listener;
}
void addSensor(int sensor, int delay) {
mSensors |= sensor;
if (mDelay > delay)
mDelay = delay;
}
void removeSensor(int sensor) {
mSensors &= ~sensor;
}
boolean hasSensor(int sensor) {
return ((mSensors & sensor) != 0);
}
public void binderDied() {
if (localLOGV) Log.d(TAG, "sensor listener died");
synchronized(mListeners) {
mListeners.remove(this);
for (int sensor = SensorManager.SENSOR_MAX; sensor > 0; sensor >>>= 1) {
if (hasSensor(sensor)) {
try {
deactivateIfUnused(sensor);
} catch (RemoteException e) {
Log.w(TAG, "RemoteException in binderDied");
}
}
}
mListeners.notify();
}
}
}
public SensorService(Context context) {
if (localLOGV) Log.d(TAG, "SensorService startup");
_sensors_control_init();
mNotificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
mContext = context;
}
public ParcelFileDescriptor getDataChanel() throws RemoteException {
return _sensors_control_open();
}
public void reportAccuracy(int sensor, int value) {
if ((sensor & (SensorManager.SENSOR_ORIENTATION|SensorManager.SENSOR_ORIENTATION_RAW)) != 0) {
synchronized (mNotificationManager) {
if (value != mCompassAccuracy) {
Log.d(TAG, "Compass needs calibration, accuracy=" + value);
if (!SystemProperties.getBoolean("debug.sensors.notification", false)) {
// don't show the sensors notification by default
return;
}
mCompassAccuracy = value;
if (value == -1) {
mNotificationManager.cancel(0);
} else {
if (value <= SENSOR_NOTIFICATION_ACCURACY_LEVEL) {
long token = Binder.clearCallingIdentity();
try {
CharSequence banner = mContext.getString(R.string.compass_accuracy_banner);
CharSequence title = mContext.getString(R.string.compass_accuracy_notificaction_title);
CharSequence body = mContext.getString(R.string.compass_accuracy_notificaction_body);
Notification n = new Notification(R.drawable.stat_notify_calibrate_compass,
banner, System.currentTimeMillis());
Intent bogusIntent = new Intent(mContext, SensorService.class);
PendingIntent contentIntent = PendingIntent.getActivity(mContext, 0, bogusIntent,
PendingIntent.FLAG_CANCEL_CURRENT|PendingIntent.FLAG_ONE_SHOT);
n.setLatestEventInfo(mContext, title, body, contentIntent);
mNotificationManager.notify(0, n);
} finally {
Binder.restoreCallingIdentity(token);
}
} else {
mNotificationManager.cancel(0);
}
}
}
}
}
}
public boolean enableSensor(IBinder listener, int sensor, int enable)
throws RemoteException {
if (localLOGV) Log.d(TAG, "enableSensor " + sensor + " " + enable);
if (listener == null) throw new NullPointerException("listener is null in enableSensor");
synchronized(mListeners) {
if (enable!=SENSOR_DISABLE && !_sensors_control_activate(sensor, true)) {
Log.w(TAG, "could not enable sensor " + sensor);
return false;
}
IBinder binder = listener;
Listener l = null;
int minDelay = enable;
int size = mListeners.size();
for (int i = 0; i < size ; i++) {
Listener test = mListeners.get(i);
if (binder.equals(test.mListener)) {
l = test;
}
if (minDelay > test.mDelay)
minDelay = test.mDelay;
}
if (l == null && enable!=SENSOR_DISABLE) {
l = new Listener(listener);
binder.linkToDeath(l, 0);
mListeners.add(l);
mListeners.notify();
}
if (l == null) {
throw new NullPointerException("no Listener object in enableSensor");
}
if (minDelay >= 0) {
_sensors_control_set_delay(minDelay);
}
if (enable != SENSOR_DISABLE) {
l.addSensor(sensor, enable);
} else {
l.removeSensor(sensor);
deactivateIfUnused(sensor);
if (l.mSensors == 0) {
mListeners.remove(l);
binder.unlinkToDeath(l, 0);
mListeners.notify();
}
}
}
return true;
}
private void deactivateIfUnused(int sensor) throws RemoteException {
int size = mListeners.size();
for (int i = 0; i < size ; i++) {
if (mListeners.get(i).hasSensor(sensor))
return;
}
_sensors_control_activate(sensor, false);
reportAccuracy(sensor, -1);
}
private ArrayList<Listener> mListeners = new ArrayList<Listener>();
private static native int _sensors_control_init();
private static native ParcelFileDescriptor _sensors_control_open();
private static native boolean _sensors_control_activate(int sensor, boolean activate);
private static native int _sensors_control_set_delay(int ms);
}
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