Android webview实现拍照的方法

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Android webview实现拍照的方法

1. html

<div id="pnlVideo1">
<input type="hidden" name="imgNric1" id="imgNric1" />
<label id="nric" class="control-label labelfont">Picture of Asset</label><br /><br />
<button id="btnOpen1" class="btn btn-default" type="button">Open WebCam</button>
<select id="videoSource">
</select>
<div id="vdoOne">
<video id="video" width="300" autoplay></video>
<canvas id="canvasPreview" width="300" height="224"></canvas>
<canvas id="canvasUpload" width='300' height='224'></canvas>
<button id="snap" class="btn btn-default" type="button">Snap Photo</button>
</div>
</div>
<script type="text/javascript">
$(document).ready(function () {
});
//// Elements for taking the snapshot
var canvasPreview = document.getElementById('canvasPreview');
var canvasUpload = document.getElementById('canvasUpload');
var contextPreview = canvasPreview.getContext('2d');
var contextUpload = canvasUpload.getContext('2d');
//#################### Video Source #######################
var videoElement = document.querySelector('video');
var videoSelect = document.querySelector('select#videoSource');
navigator.mediaDevices.enumerateDevices()
.then(gotDevices).then(getStream).catch(handleError);
videoSelect.onchange = getStream;
function gotDevices(deviceInfos) {
for (var i = 0; i !== deviceInfos.length; ++i) {
var deviceInfo = deviceInfos[i];
var option = document.createElement('option');
option.value = deviceInfo.deviceId;
if (deviceInfo.kind === 'videoinput') {
option.text = deviceInfo.label || 'camera ' +
(videoSelect.length + 1);
videoSelect.appendChild(option);
} else {
console.log('Found ome other kind of source/device: ', deviceInfo);
}
}
}
function getStream() {
if (window.stream) {
window.stream.getTracks().forEach(function (track) {
track.stop();
});
}
var constraints = {
video: {
optional: [{
sourceId: videoSelect.value
}]
}
};
navigator.mediaDevices.getUserMedia(constraints).
then(gotStream).catch(handleError);
}
function gotStream(stream) {
window.stream = stream; // make stream available to console
videoElement.srcObject = stream;
}
function handleError(error) {
console.log('Error: ', error);
}
//######################## End Video Source #################
// Get access to the camera!
if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
navigator.mediaDevices.getUserMedia({ video: true }).then(function (stream) {
videoElement.src = window.URL.createObjectURL(stream);
videoElement.play();
});
}
else {
document.getElementById("pnlVideo1").style.display = "none";
}
//// Trigger photo take
document.getElementById("snap").addEventListener("click", function () {
contextPreview.drawImage(videoElement, 0, 0, 300, 224);
contextUpload.drawImage(videoElement, 0, 0, 300, 224);
document.getElementById("video").style.display = "none";
document.getElementById("snap").style.display = "none";
document.getElementById("canvasPreview").style.display = "block";
var image = document.getElementById("canvasUpload").toDataURL("image/jpeg");
image = image.replace('data:image/jpeg;base64,', '');
$("#imgNric1").val(image);
});
//// Trigger photo take
document.getElementById("btnOpen1").addEventListener("click", function () {
document.getElementById("vdoOne").style.display = "block";
document.getElementById("video").style.display = "block";
document.getElementById("snap").style.display = "block";
document.getElementById("canvasPreview").style.display = "none";
});
</script>

2. Android studio 中权限设置:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.esbu.nec.bme">
<uses-permission android:name="android.permission.INTERNET" />
<!-- To auto-complete the email text field in the login form with the user's emails -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-feature
android:name="android.hardware.camera"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@mipmap/sgh"
android:label="@string/app_name"
android:supportsRtl="true"
android:hardwareAccelerated="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".LoginActivity"
android:label="@string/title_activity_login"></activity>
</application>
</manifest>

3. 加载view时需要开启JavaScript和文件访问权限。

...
mWebView = (AdvancedWebView) findViewById(R.id.webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setBuiltInZoomControls(true);
webSettings.setAllowFileAccess(true);
...

 

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