使用Cordova可以很方便的通过js代码来使用设备摄像头拍照,只需把camera插件添加进来即可。
一,添加camera插件
首先我们要在“终端”中进入工程所在的目录,然后运行如下命令:
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cordova plugin add cordova-plugin-camera |
可以看到camera相机插件已经成功添加了:
二,调用设备摄像头
1,拍照
下面样例会调用手机摄像头拍照(可以切换前置、后置摄像头),同时拍照完毕后会把照片在页面上显示出来。
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<!DOCTYPE html> <html> <head>
<title>Capture Photo</title>
<meta http-equiv= "Content-type" content= "text/html; charset=utf-8" >
<script type= "text/javascript" charset= "utf-8" src= "cordova.js" ></script>
<script type= "text/javascript" charset= "utf-8" >
var destinationType;
document.addEventListener( "deviceready" ,onDeviceReady, false );
//Cordova加载完成会触发
function onDeviceReady() {
destinationType=navigator.camera.DestinationType;
}
//拍照
function capturePhoto() {
//拍照并获取Base64编码的图像(quality : 存储图像的质量,范围是[0,100])
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50,
destinationType: destinationType.DATA_URL }
);
}
//拍照成功
function onPhotoDataSuccess(imageData) {
console.log(imageData);
var smallImage = document.getElementById( 'smallImage' );
smallImage.style.display = 'block' ;
smallImage.src = "data:image/jpeg;base64," + imageData;
}
//拍照失败
function onFail(message) {
alert( '拍照失败: ' + message);
}
</script>
</head>
<body style= "padding-top:50px" >
<button style= "font-size:23px;" onclick= "capturePhoto();" >拍摄照片</button> <br>
<img style= "display:none;width:240px;height:320px;" id= "smallImage" src= "" />
</body>
</html> |
2,拍照并进行编辑
拍摄照片后我们还可以进行简单的编辑,只要把 allowEdit 参数设为 true 即可。
下面样例可以看到,拍照完毕后会先进入编辑界面。上面有个正方形进行框,通过拖拽、缩放照片可以将其裁剪为正方形的图片(这个对需要使用正方形图片的场合比较有用,比如用户头像)。
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<!DOCTYPE html> <html> <head>
<title>Capture Photo</title>
<meta http-equiv= "Content-type" content= "text/html; charset=utf-8" >
<script type= "text/javascript" charset= "utf-8" src= "cordova.js" ></script>
<script type= "text/javascript" charset= "utf-8" >
var destinationType;
document.addEventListener( "deviceready" ,onDeviceReady, false );
//Cordova加载完成会触发
function onDeviceReady() {
destinationType=navigator.camera.DestinationType;
}
//拍照并编辑
function capturePhotoEdit() {
//拍照并获取Base64编码的图像(quality : 存储图像的质量,范围是[0,100])
//allowEdit: true 拍照完毕后允许简单编辑
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 20,
allowEdit: true ,
destinationType: destinationType.DATA_URL });
}
//拍照成功
function onPhotoDataSuccess(imageData) {
console.log(imageData);
var smallImage = document.getElementById( 'smallImage' );
smallImage.style.display = 'block' ;
smallImage.src = "data:image/jpeg;base64," + imageData;
}
//拍照失败
function onFail(message) {
alert( '拍照失败: ' + message);
}
</script>
</head>
<body style= "padding-top:50px" >
<button style= "font-size:23px;" onclick= "capturePhotoEdit();" >拍照并编辑</button> <br>
<img style= "display:none;width:240px;height:240px;" id= "smallImage" src= "" />
</body>
</html> |
原文出自:www.hangge.com 转载请保留原文链接:http://www.hangge.com/blog/cache/detail_1146.html