/*
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you 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 org.apache.cordova.devicemotion;
import java.util.List;
import org.apache.cordova.CordovaWebView;
import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaInterface;
import org.apache.cordova.CordovaPlugin;
import org.apache.cordova.PluginResult;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
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.Looper;
/**
* This class listens to the accelerometer sensor and stores the latest
* acceleration values x,y,z.
*/
public class AccelListener extends CordovaPlugin implements SensorEventListener {
public static int STOPPED = 0;
public static int STARTING = 1;
public static int RUNNING = 2;
public static int ERROR_FAILED_TO_START = 3;
private float x,y,z; // most recent acceleration values
private long timestamp; // time of most recent value
private int status; // status of listener
private int accuracy = SensorManager.SENSOR_STATUS_UNRELIABLE;
private SensorManager sensorManager; // Sensor manager
private Sensor mSensor; // Acceleration sensor returned by sensor manager
private CallbackContext callbackContext; // Keeps track of the JS callback context.
private Handler mainHandler=null;
private Runnable mainRunnable =new Runnable() {
public void run() {
AccelListener.this.timeout();
}
};
/**
* Create an accelerometer listener.
*/
public AccelListener() {
this.x = 0;
this.y = 0;
this.z = 0;
this.timestamp = 0;
this.setStatus(AccelListener.STOPPED);
}
/**
* Sets the context of the Command. This can then be used to do things like
* get file paths associated with the Activity.
*
* @param cordova The context of the main Activity.
* @param webView The associated CordovaWebView.
*/
@Override
public void initialize(CordovaInterface cordova, CordovaWebView webView) {
super.initialize(cordova, webView);
this.sensorManager = (SensorManager) cordova.getActivity().getSystemService(Context.SENSOR_SERVICE);
}
/**
* Executes the request.
*
* @param action The action to execute.
* @param args The exec() arguments.
* @param callbackId The callback id used when calling back into JavaScript.
* @return Whether the action was valid.
*/
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) {
if (action.equals("start")) {
this.callbackContext = callbackContext;
if (this.status != AccelListener.RUNNING) {
// If not running, then this is an async call, so don't worry about waiting
// We drop the callback onto our stack, call start, and let start and the sensor callback fire off the callback down the road
this.start();
}
}
else if (action.equals("stop")) {
if (this.status == AccelListener.RUNNING) {
this.stop();
}
} else {
// Unsupported action
return false;
}
PluginResult result = new PluginResult(PluginResult.Status.NO_RESULT, "");
result.setKeepCallback(true);
callbackContext.sendPluginResult(result);
return true;
}
/**
* Called by AccelBroker when listener is to be shut down.
* Stop listener.
*/
public void onDestroy() {
this.stop();
}
//--------------------------------------------------------------------------
// LOCAL METHODS
//--------------------------------------------------------------------------
//
/**
* Start listening for acceleration sensor.
*
* @return status of listener
*/
private int start() {
// If already starting or running, then just return
if ((this.status == AccelListener.RUNNING) || (this.status == AccelListener.STARTING)) {
return this.status;
}
this.setStatus(AccelListener.STARTING);
// Get accelerometer from sensor manager
List<Sensor> list = this.sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);
// If found, then register as listener
if ((list != null) && (list.size() > 0)) {
this.mSensor = list.get(0);
this.sensorManager.registerListener(this, this.mSensor, SensorManager.SENSOR_DELAY_UI);
this.setStatus(AccelListener.STARTING);
} else {
this.setStatus(AccelListener.ERROR_FAILED_TO_START);
this.fail(AccelListener.ERROR_FAILED_TO_START, "No sensors found to register accelerometer listening to.");
return this.status;
}
// Set a timeout callback on the main thread.
stopTimeout();
mainHandler = new Handler(Looper.getMainLooper());
mainHandler.postDelayed(mainRunnable, 2000);
return this.status;
}
private void stopTimeout() {
if(mainHandler!=null){
mainHandler.removeCallbacks(mainRunnable);
}
}
/**
* Stop listening to acceleration sensor.
*/
private void stop() {
stopTimeout();
if (this.status != AccelListener.STOPPED) {
this.sensorManager.unregisterListener(this);
}
this.setStatus(AccelListener.STOPPED);
this.accuracy = SensorManager.SENSOR_STATUS_UNRELIABLE;
}
/**
* Returns an error if the sensor hasn't started.
*
* Called two seconds after starting the listener.
*/
private void timeout() {
if (this.status == AccelListener.STARTING) {
this.setStatus(AccelListener.ERROR_FAILED_TO_START);
this.fail(AccelListener.ERROR_FAILED_TO_START, "Accelerometer could not be started.");
}
}
/**
* Called when the accuracy of the sensor has changed.
*
* @param sensor
* @param accuracy
*/
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// Only look at accelerometer events
if (sensor.getType() != Sensor.TYPE_ACCELEROMETER) {
return;
}
// If not running, then just return
if (this.status == AccelListener.STOPPED) {
return;
}
this.accuracy = accuracy;
}
/**
* Sensor listener event.
*
* @param SensorEvent event
*/
public void onSensorChanged(SensorEvent event) {
// Only look at accelerometer events
if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER) {
return;
}
// If not running, then just return
if (this.status == AccelListener.STOPPED) {
return;
}
this.setStatus(AccelListener.RUNNING);
if (this.accuracy >= SensorManager.SENSOR_STATUS_ACCURACY_MEDIUM) {
// Save time that event was received
this.timestamp = System.currentTimeMillis();
this.x = event.values[0];
this.y = event.values[1];
this.z = event.values[2];
this.win();
}
}
/**
* Called when the view navigates.
*/
@Override
public void onReset() {
if (this.status == AccelListener.RUNNING) {
this.stop();
}
}
// Sends an error back to JS
private void fail(int code, String message) {
// Error object
JSONObject errorObj = new JSONObject();
try {
errorObj.put("code", code);
errorObj.put("message", message);
} catch (JSONException e) {
e.printStackTrace();
}
PluginResult err = new PluginResult(PluginResult.Status.ERROR, errorObj);
err.setKeepCallback(true);
callbackContext.sendPluginResult(err);
}
private void win() {
// Success return object
PluginResult result = new PluginResult(PluginResult.Status.OK, this.getAccelerationJSON());
result.setKeepCallback(true);
callbackContext.sendPluginResult(result);
}
private void setStatus(int status) {
this.status = status;
}
private JSONObject getAccelerationJSON() {
JSONObject r = new JSONObject();
try {
r.put("x", this.x);
r.put("y", this.y);
r.put("z", this.z);
r.put("timestamp", this.timestamp);
} catch (JSONException e) {
e.printStackTrace();
}
return r;
}
}