今天看了一下phonegap 的Camera摄像头章节入门知识，从官网ApI上看了例子，然后分析了一下：
配置可以看一下官网的API：http://www.phonegap100.com/doc/cordova_camera_camera.md.html#Camera
通过看官网API，下面总结一下祥光方法和属性参数：
<span style="font-size:18px;">Camera Api简单介绍 Camera选择使用摄像头拍照，或从设备相册中获取一张照片。图片以 base64 编码的 字符串或图片URI 形式返回。 方法： 1. camera.getPicture 拍照获取相册图片 navigator.camera.getPicture( cameraSuccess, cameraError, [ cameraOptions ] ); cameraSuccess：提供图像数据的onSuccess 回调函数。 cameraError：提供错误信息的 onError回调函数。 cameraOptions：定制摄像头设置的可选参数 2. camera.cleanup 清除拍照后设备的缓存图片 navigator.camera.cleanup( cameraSuccess, cameraError ); 3.cameraOptions 参数： 定制摄像头设置的可选参数。 quality : 存储图像的质量，范围是[0,100]。 destinationType :选择返回数据的格式。 sourceType :设定图片来源。data:image/jpeg;base64, allowEdit :在选择图片进行操作之前允许对其进行简单编辑。(好像只有ios支持) encodingType :选择返回图像文件的编码方 encodingType: Camera.EncodingType.JPEG targetWidth :以像素为单位的图像缩放宽度指定图片展示的时候的宽度 targetHeight :以像素为单位的图像缩放高度指定图片展示的时候的高度 saveToPhotoAlbum:拍完照片后是否将图像保存在设备上的相册 mediaType 设置选择媒体的类型 cameraDirection 选择前置摄像头还是后置摄像头 注意：在Android中。 忽略allowEdit 参数。 Camera.PictureSourceType.PHOTOLIBRARY Camera.PictureSourceType.SAVEDPHOTOALBUM 都会显示同一个相集。 </span>
下面给予官网上的例子，相关代码说明已经非常清晰：
<span style="font-size:18px;"><!DOCTYPE html>
<html>
<head>
<title>Capture Photo</title>
<script type="text/javascript" charset="utf-8" src="cordova-x.x.x.js"></script>
<script type="text/javascript" charset="utf-8">
var pictureSource; // picture source
var destinationType; // sets the format of returned value
// Wait for device API libraries to load
document.addEventListener("deviceready",onDeviceReady,false);
// device APIs are available
function onDeviceReady() {
pictureSource=navigator.camera.PictureSourceType;
destinationType=navigator.camera.DestinationType;
}
// Called when a photo is successfully retrieved
function onPhotoDataSuccess(imageData) {
// Uncomment to view the base64-encoded image data
// console.log(imageData);
// Get image handle
var smallImage = document.getElementById('smallImage');
// Unhide image elements
smallImage.style.display = 'block';
// Show the captured photo
// The inline CSS rules are used to resize the image
smallImage.src = "data:image/jpeg;base64," + imageData;
}
// Called when a photo is successfully retrieved
function onPhotoURISuccess(imageURI) {
// Uncomment to view the image file URI
// console.log(imageURI);
// Get image handle
var largeImage = document.getElementById('largeImage');
// Unhide image elements
//
largeImage.style.display = 'block';
// Show the captured photo
// The inline CSS rules are used to resize the image
largeImage.src = imageURI;
}
// A button will call this function
function capturePhoto() {
// Take picture using device camera and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50,
destinationType: destinationType.DATA_URL });
}
// A button will call this function
//
function capturePhotoEdit() {
// Take picture using device camera, allow edit, and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 20, allowEdit: true,
destinationType: destinationType.DATA_URL });
}
// A button will call this function
function getPhoto(source) {
// Retrieve image file location from specified source
navigator.camera.getPicture(onPhotoURISuccess, onFail, { quality: 50,
destinationType: destinationType.FILE_URI,
sourceType: source });
}
// Called if something bad happens.
function onFail(message) {
alert('Failed because: ' + message);
}
</script>
</head>
<body>
<button onclick="capturePhoto();">Capture Photo</button> <br>
<button onclick="capturePhotoEdit();">Capture Editable Photo</button> <br>
<button onclick="getPhoto(pictureSource.PHOTOLIBRARY);">From Photo Library</button><br>
<button onclick="getPhoto(pictureSource.SAVEDPHOTOALBUM);">From Photo Album</button><br>
<img style="display:none;width:60px;height:60px;" id="smallImage" src="" />
<img style="display:none;" id="largeImage" src="" />
</body>
</html></span>
经过上述实例，学到知识点：
1）会用相关参数，特别是cameraOptions 参数
2）当返回类型是destinationType: destinationType.DATA_URL时候：在success返回的函数里面要用到base64解码smallImage.src = "data:image/jpeg;base64," + imageData;
3）当返回类型是destinationType: destinationType.FILE_URI时候：在success返回的函数里面要用到largeImage.src = imageURI，直接给该file_url路径即可。
4）html中设置块级元素：smallImage.style.display = ‘block‘;
原文地址：http://blog.csdn.net/itjavawfc/article/details/46240633
