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" style="color:#888;font-weight:bold;">Picture of Asset</label><br /><br /> <button id="btnOpen1" class="btn btn-default" type="button">Open WebCam</button> <select id="videoSource" style="display:none"> </select> <div id="vdoOne" style="display:none;"> <video id="video" style="margin-top:15px;margin-bottom:15px;" width="300" autoplay></video> <canvas id="canvasPreview" style="margin-top:15px;" width="300" height="224"></canvas> <canvas id="canvasUpload" style="display:none;" 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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