How to launch camera from button in webview -Andro

How can I launch the camera of the device from a button in a Webview?

I have this code in Android:

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");
}

And the Html file is very simple:

<html>
    <body>
        <form enctype="multipart/form-data" method="post">    
              <h2>capture=camera</h2>  
              <input type="file" accept="image/*;capture=camera"></input>
        </form>
    </body>
</html>

When I launch the app, and click in the button,

The log shows this:

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

And the camera doesn't launch.

What do I miss ?

you can use Phonegap

extend Activity to DroidGap

then create folder www inside assets folder and inside folder www create folder js and pu inside it phonegap.js

then create file 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>

and after this you must add library cordova.jar

then run your application