让HTML5使用KitKat访问Android的相机

Question

我使用以下代码与之前的Android版本配合使用，通过webview访问相机和手机文件，但是当我使用KitKat运行它时，它似乎无法正常工作。我也不想使用phonegap来解决问题。我不确定为什么会发生这种情况如果有人能提出解决方案我真的很感激

public class Home extends Activity {

     //private Button button;
    private WebView webView;
    final Activity activity = this;
    public Uri imageUri;

    private static final int FILECHOOSER_RESULTCODE = 2888;
    private ValueCallback<Uri> mUploadMessage;
    private Uri mCapturedImageURI = null;


    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.home);

        //Get webview 
        webView = (WebView) findViewById(R.id.webView1);

        // Define url that will open in webview 
        String webViewUrl = "http://www.nutritics.com/test.html";

        webView.setWebViewClient(new WebViewClient(){
            @Override
            public void onReceivedSslError (WebView webView, SslErrorHandler handler, SslError error) {
                handler.proceed();
            }
        });

        // Javascript inabled on webview  
        webView.getSettings().setJavaScriptEnabled(true);

        // Other webview options
        webView.getSettings().setLoadWithOverviewMode(true);

        //webView.getSettings().setUseWideViewPort(true);

        //Other webview settings
        webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        webView.setScrollbarFadingEnabled(false);
        webView.getSettings().setBuiltInZoomControls(true);
        webView.getSettings().setPluginState(PluginState.ON);
        webView.getSettings().setAllowFileAccess(true);
        webView.getSettings().setSupportZoom(true); 

        //Load url in webview
        webView.loadUrl(webViewUrl);

        startWebView(); 

    }

    private void startWebView() {

        webView.setWebChromeClient(new WebChromeClient() {

            // openFileChooser for Android 3.0+
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType){  

                // Update message
                mUploadMessage = uploadMsg;

                try{    

                    // Create AndroidExampleFolder at sdcard

                    File imageStorageDir = new File(
                                           Environment.getExternalStoragePublicDirectory(
                                           Environment.DIRECTORY_PICTURES)
                                           , "AndroidExampleFolder");

                    if (!imageStorageDir.exists()) {
                        // Create AndroidExampleFolder at sdcard
                        imageStorageDir.mkdirs();
                    }

                    // Create camera captured image file path and name 
                    File file = new File(
                                    imageStorageDir + File.separator + "IMG_"
                                    + String.valueOf(System.currentTimeMillis()) 
                                    + ".jpg");

                    mCapturedImageURI = Uri.fromFile(file); 

                    // Camera capture image intent
                    final Intent captureIntent = new Intent(
                                                  android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

                    captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);

                    Intent i = new Intent(Intent.ACTION_GET_CONTENT); 
                    i.addCategory(Intent.CATEGORY_OPENABLE);
                    i.setType("image/*");

                    // Create file chooser intent
                    Intent chooserIntent = Intent.createChooser(i, "Image Chooser");

                    // Set camera intent to file chooser 
                    chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS
                                           , new Parcelable[] { captureIntent });

                    // On select image call onActivityResult method of activity
                    startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);

                  }
                 catch(Exception e){
                     Toast.makeText(getBaseContext(), "Exception:"+e, 
                                Toast.LENGTH_LONG).show();
                 }

            }

            // openFileChooser for Android < 3.0
            public void openFileChooser(ValueCallback<Uri> uploadMsg){
                openFileChooser(uploadMsg, "");
            }

            //openFileChooser for other Android versions
            public void openFileChooser(ValueCallback<Uri> uploadMsg, 
                                       String acceptType, 
                                       String capture) {

                openFileChooser(uploadMsg, acceptType);
            }

            // The webPage has 2 filechoosers and will send a 
            // console message informing what action to perform, 
            // taking a photo or updating the file

            public boolean onConsoleMessage(ConsoleMessage cm) {  

                onConsoleMessage(cm.message(), cm.lineNumber(), cm.sourceId());
                return true;
            }

            public void onConsoleMessage(String message, int lineNumber, String sourceID) {
                //Log.d("androidruntime", "Show console messages, Used for debugging: " + message);

            }
        });   // End setWebChromeClient
     }

    // Return here when file selected from camera or from SDcard

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) { 

     if(requestCode==FILECHOOSER_RESULTCODE)  
     {  

            if (null == this.mUploadMessage) {
                return;

            }

           Uri result=null;

           try{
                if (resultCode != RESULT_OK) {

                    result = null;

                } else {

                    // retrieve from the private variable if the intent is null
                    result = intent == null ? mCapturedImageURI : intent.getData(); 
                } 
            }
            catch(Exception e)
            {
                Toast.makeText(getApplicationContext(), "activity :"+e,
                 Toast.LENGTH_LONG).show();
            }

            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;

     }

    }

    // Open previous opened link from history on webview when back button pressed

    @Override
    // Detect when the back button is pressed
    public void onBackPressed() {

        if(webView.canGoBack()) {

            webView.goBack();

        } else {
            // Let the system handle the back button
            super.onBackPressed();
        }
    }

}