我必须使用phongap开发一个Android应用程序,从设备中检索传感器数据。
我必须听的传感器之一是环境光传感器。这个传感器在phoneGap中没有实现,所以我必须将它作为插件添加到PhoneGap。
我知道如何添加插件,我知道如何从Java访问ALS数据 - 但为了确保我正在实现它,我想实现它,因为PhoneGap实现了其他传感器,如Accelerometer。因此我在java中编写了一个ALSManager
类,我发现这里实现了Accelerometer:
并添加了lightSensor和lightValues模块,如加速器模块和加速模块。
但是当我运行此应用程序时,我收到以下错误消息:
TypeError:Object#没有方法'getCurrentLight'
(在lightSensor模块中我有getCurrentLight方法)。
有没有人可以建议我缺少什么?或者我该怎么做?
提前致谢,
我在cordova-2.5.0.js中添加的代码。如果这还不够,请告诉我:
// file: lib/common/plugin/LightValues.js
define("cordova/plugin/LightValues", function(require, exports, module) {
var Acceleration = function(lux, timestamp) {
this.lux = lux;
this.timestamp = timestamp || (new Date()).getTime();
};
module.exports = LightValues;
});
// file: lib/common/plugin/lightSensor.js
define("cordova/plugin/lightSensor", function(require, exports, module) {
/**
* This class provides access to device accelerometer data.
* @constructor
*/
var argscheck = require('cordova/argscheck'),
utils = require("cordova/utils"),
exec = require("cordova/exec"),
LightValues = require('cordova/plugin/LightValues');
// Is the accel sensor running?
var running = false;
// Keeps reference to watchAcceleration calls.
var timers = {};
// Array of listeners; used to keep track of when we should call start and stop.
var listeners = [];
// Last returned acceleration object from native
var light = null;
// Tells native to start.
function start() {
exec(function(a) {
var tempListeners = listeners.slice(0);
light = new LightValues(a.lux, a.timestamp);
for (var i = 0, l = tempListeners.length; i < l; i++) {
tempListeners[i].win(light);
}
}, function(e) {
var tempListeners = listeners.slice(0);
for (var i = 0, l = tempListeners.length; i < l; i++) {
tempListeners[i].fail(e);
}
}, "Light", "start", []);
running = true;
}
// Tells native to stop.
function stop() {
exec(null, null, "Light", "stop", []);
running = false;
}
// Adds a callback pair to the listeners array
function createCallbackPair(win, fail) {
return {win:win, fail:fail};
}
// Removes a win/fail listener pair from the listeners array
function removeListeners(l) {
var idx = listeners.indexOf(l);
if (idx > -1) {
listeners.splice(idx, 1);
if (listeners.length === 0) {
stop();
}
}
}
var lightSensor = {
/**
* Asynchronously acquires the current acceleration.
*
* @param {Function} successCallback The function to call when the acceleration data is available
* @param {Function} errorCallback The function to call when there is an error getting the acceleration data. (OPTIONAL)
* @param {AccelerationOptions} options The options for getting the accelerometer data such as timeout. (OPTIONAL)
*/
getCurrentLight: function(successCallback, errorCallback, options) {
//argscheck.checkArgs('fFO', 'lightSensor.getCurrentLight', arguments);
var p;
var win = function(a) {
removeListeners(p);
successCallback(a);
};
var fail = function(e) {
removeListeners(p);
errorCallback && errorCallback(e);
};
p = createCallbackPair(win, fail);
listeners.push(p);
if (!running) {
start();
}
},
/**
* Asynchronously acquires the acceleration repeatedly at a given interval.
*
* @param {Function} successCallback The function to call each time the acceleration data is available
* @param {Function} errorCallback The function to call when there is an error getting the acceleration data. (OPTIONAL)
* @param {AccelerationOptions} options The options for getting the accelerometer data such as timeout. (OPTIONAL)
* @return String The watch id that must be passed to #clearWatch to stop watching.
*/
watchLight: function(successCallback, errorCallback, options) {
//argscheck.checkArgs('fFO', 'lightSensor.watchLight', arguments);
// Default interval (10 sec)
var frequency = (options && options.frequency && typeof options.frequency == 'number') ? options.frequency : 10000;
// Keep reference to watch id, and report accel readings as often as defined in frequency
var id = utils.createUUID();
var p = createCallbackPair(function(){}, function(e) {
removeListeners(p);
errorCallback && errorCallback(e);
});
listeners.push(p);
timers[id] = {
timer:window.setInterval(function() {
if (light) {
successCallback(light);
}
}, frequency),
listeners:p
};
if (running) {
// If we're already running then immediately invoke the success callback
// but only if we have retrieved a value, sample code does not check for null ...
if (light) {
successCallback(light);
}
} else {
start();
}
return id;
},
/**
* Clears the specified accelerometer watch.
*
* @param {String} id The id of the watch returned from #watchAcceleration.
*/
clearWatch: function(id) {
// Stop javascript timer & remove from timer list
if (id && timers[id]) {
window.clearInterval(timers[id].timer);
removeListeners(timers[id].listeners);
delete timers[id];
}
}
};
module.exports = lightSensor;
});
答案 0 :(得分:0)
我想问题可能是您要将插件代码添加到cordova-2.5.0.js
文件中。相反,您应该为每个JavaScript文件创建一个独立的JS文件,然后在HTML页面中为那些要使用该功能的文件创建cordova.require()
。
因此,在www文件夹中的某处创建LightValues.js
和LightSensor.js
作为单独的文件。然后在HTML文件中,确保包含JS文件:<script type="text/javascript" src="path-to-lightSensor.JS-file">
(您只需要包含这一个文件,因为它需要()是第二个文件。)
接下来,在deviceReady()
功能中,您可以使用var lightSensor = cordova.require("cordova/plugin/lightSensor")
调用光线传感器。请注意, cordova / plugin / lightSensor 不是JS文件的路径,而是您在编写插件时在define()
部分中声明的模块名称。
在此之后你应该可以调用lightSensor.getCurrentLight()。如果你console.log(lightSensor)
,你会期望看到你写的所有可用方法。
请注意,cordova.require
和cordova.define
在cordova-2.5中工作并不是肯定的。我希望他们能做到this page sort of suggests it may not be supported until 2.6。如果在分割文件后遇到问题,可能是因为这个原因。
答案 1 :(得分:0)
我刚开发了一个光传感器插件,幸运的是成功了。我刚刚阅读了上面的代码并发现了一些关于标识符的小错误,例如“var Acceleration = function(lux,timestamp)”变量应该是LightValues而不是Acceleration。因此,请首先检查代码以消除一些重要错误。然后,我首先使用“lux”作为变量的名称,但在调试程序时我得到了一个未定义的光值。所以我将“lux”改为“x”,它确实有效!
应该注意6个文件:“LightListener.java”,“LightValues.js”,“LightSensor.js”,“cordova_plugin.js”,“index.html”和“config.xml”。如果配置所有6个文件,程序应该可以正常工作。