[英]How to launch camera from button in webview -Android
如何通過Webview中的按鈕啟動設備的相機?
我在Android中有以下代碼:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webview = (WebView)findViewById(R.id.webView1);
webview.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("file:///android_asset/camtest.html");
}
HTML文件非常簡單:
<html>
<body>
<form enctype="multipart/form-data" method="post">
<h2>capture=camera</h2>
<input type="file" accept="image/*;capture=camera"></input>
</form>
</body>
</html>
當我啟動應用程序,然后單擊按鈕時,
日志顯示如下:
02-10 12:00:03.775: V/WebViewInputDispatcher(10110): blockWebkitDraw
02-10 12:00:03.775: V/WebViewInputDispatcher(10110): blockWebkitDraw lockedfalse
02-10 12:00:04.085: D/webview(10110): blockWebkitViewMessage= false
而且相機無法啟動。
我想念什么?
你可以使用Phonegap
將Activity擴展到DroidGap
然后創建文件夾www
內部assets folder
和文件夾內的www
創建文件夾js
和PU里面phonegap.js
然后創建文件index.html
:
<!DOCTYPE html>
<html>
<head>
<title>Capture Photo</title>
<meta name="viewport" content="width=device-width,height=device-height,initial-scale=1"/>
<script type="text/javascript" charset="utf-8" src="js/phonegap.js"></script>
<script type="text/javascript" charset="utf-8">
var pictureSource; // picture source
var destinationType; // sets the format of returned value
// Wait for PhoneGap to connect with the device
//
document.addEventListener("deviceready",onDeviceReady,false);
// PhoneGap is ready to be used!
//
function onDeviceReady() {
pictureSource=navigator.camera.PictureSourceType;
destinationType=navigator.camera.DestinationType;
}
// Called when a photo is successfully retrieved
//
function onPhotoDataSuccess(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 onPhotoFileSuccess(imageData) {
// Get image handle
console.log(JSON.stringify(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 = 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 capturePhotoWithData() {
// Take picture using device camera and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50 });
}
function capturePhotoWithFile() {
navigator.camera.getPicture(onPhotoFileSuccess, onFail, { quality: 50, destinationType: Camera.DestinationType.FILE_URI });
}
// 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="capturePhotoWithData();">Capture Photo With Image Data</button> <br>
<button onclick="capturePhotoWithFile();">Capture Photo With Image File URI</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>
然后,您必須添加庫cordova.jar
然后運行您的應用程序
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