在Android WebView中使用HTML JS打开相机？

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问题描述

我想在我的本机应用程序中的Android手机的webview中使用HTML JavaScirpt访问摄像头。我试过很多解决方案没有帮助。 html字符串如下，

I want to access camera using HTML JavaScirpt in a webview in Android phone within my native application. I tried a lot of solutions none were helpfull. The html string is as follows,

String html =
        "<!DOCTYPE html>"+
"<html>"+
"<head>"+
"<meta charset='utf-8'>"+
"<title>Display Webcam Stream</title>"+
"<style>"+
"#container {"+
"    margin: 0px auto;"+
 "   width: 500px;"+
 "   height: 375px;"+
 "   border: 10px #333 solid;"+
"}"+
"#videoElement {"+
"    width: 500px;"+
"    height: 375px;"+
"    background-color: #666;"+
"}"+
"#canvas {"+
"    width: 500px;"+
"    height: 375px;"+
"    background-color: #CCC;"+
"}"+
"</style>"+
"</head>"+
"<body>"+
"<input id='fileselect' type='file' accept='image/*' capture='camera'>"+
"<div id='container'>"+
 "   <video autoplay id='videoElement'>"+
    "</video>"+
"</div>"+
"<canvas id='canvas' width='500' height='375'></canvas>"+
"<input type='button' value='Save' id='save' />"+
"<img id='imgtag' src='' width='500' height='375' alt='capture' /> "+
"<script>"+
"var video = document.querySelector('#videoElement');"+
"navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia || navigator.oGetUserMedia;"+
"if (navigator.getUserMedia) {       "+
"    navigator.getUserMedia({video: true}, handleVideo, videoError);"+
"}   "+
"function handleVideo(stream) {"+
"    video.src = window.URL.createObjectURL(stream);"+
"}"+
"function videoError(e) {"+
"}"+
"var v,canvas,context,w,h;"+
"var imgtag = document.getElementById('imgtag');"+
"var sel = document.getElementById('fileselect');"+
"document.addEventListener('DOMContentLoaded', function(){"+
"    v = document.getElementById('videoElement');"+
"    canvas = document.getElementById('canvas');"+
"    context = canvas.getContext('2d');"+
"   w = canvas.width;"+
"    h = canvas.height;"+
"},false);"+
"function draw(v,c,w,h) {"+
 "   if(v.paused || v.ended) return false;"+
  "  context.drawImage(v,0,0,w,h);"+
   "var uri = canvas.toDataURL('image/png');"+
   "imgtag.src = uri;"+
"}"+
"document.getElementById('save').addEventListener('click',function(e){"+
"   draw(v,context,w,h);"+
"});"+
"var fr;"+
"sel.addEventListener('change',function(e){"+
"   var f = sel.files[0];"+
"   fr = new FileReader();"+
"   fr.onload = receivedText;"+
"   fr.readAsDataURL(f);"+
"})"+
"function receivedText() {"+
"   imgtag.src = fr.result;"+
"} "+
"</script>"+
"</body>"+
"</html>";

我正在将此字符串加载到我的webview，

I am loading this string into my webview,

WebView browser;
    browser=(WebView)findViewById(R.id.WebView01);
    browser.getSettings().setJavaScriptEnabled(true);
    browser.getSettings().setPluginsEnabled(true);
    browser.addJavascriptInterface(new WebAppInterface(this), "Android");
    browser.loadDataWithBaseURL("", html, mimeType, encoding, "");

我总是在日志消息中出现异常：

I always get an exception in the log messages:

任何帮助都会很棒。提前感谢

Any help will be greatfull. Thanks in advance

JavaScirpt

在Android WebView中使用HTML JS打开相机？

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