我有这个html，如果我用chrome应用程序打开它，让用户用相机拍照并上传它，效果很好。选择相机拍摄的照片后，将显示文件名称，使用提交按钮我可以上传照片。
<html>
<body>
<form action="upload.php" method="post" enctype="multipart/form-data">
Select image to upload:
<input type="file" accept="image/*" name="fileToUpload" id="fileToUpload">
<input type="submit" value="Upload Image" name="submit">
</form>
</body>
</html>
问题是，如果我在Android应用程序的webview上打开这个网站，那么，相机是打开的，是的，但是在接受了捕获的图像之后，那么，图像没有被传递给html，并且可以上传它。正在显示“没有文件选择”消息。
这是我的webview对象的源代码：
webView=new WebView(ctx);
webView.loadUrl(URLParser.parse(this.url));
webView.getLayoutParams().height=LinearLayout.LayoutParams.MATCH_PARENT;
webView.getLayoutParams().width=LinearLayout.LayoutParams.MATCH_PARENT;
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setDomStorageEnabled(true);
webView.getSettings().setAllowFileAccessFromFileURLs(true);
webView.getSettings().setAllowUniversalAccessFromFileURLs(true);
webView.getSettings().setJavaScriptEnabled(allowJavascript);
webView.getSettings().setSupportZoom(allowZooming);
webView.getSettings().setBuiltInZoomControls(allowZooming);
CookieManager.getInstance().setAcceptCookie(allowCookies);
webView.setDownloadListener(new DownloadListener() {
public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse( url ));
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
ApplicationContextProvider.getContext().startActivity(i);
}
});
webView.setWebChromeClient(new WebChromeClient() {
public void onGeolocationPermissionsShowPrompt(String origin, android.webkit.GeolocationPermissions.Callback callback) {
callback.invoke(origin, true, false);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> uploadMsg, WebChromeClient.FileChooserParams fileChooserParams){
// Store all the mime types in an array
String inputAcceptParameter = fileChooserParams.getAcceptTypes()[0];
String[] mimeTypes = inputAcceptParameter.split(",");
boolean isImage = false;
for(String mimeType : mimeTypes) {
if(mimeTypes[0].equals("image/*"))
isImage = true;
}
uploadMsgCopy = uploadMsg;
if(isImage) {
Util.launchExternalCameraGalleryChooserApp(Constants.WEB_INPUT);
} else {
Util.launchExternalBrowser(Constants.WEB_INPUT);
}
return true;
}
});
webView.setWebViewClient(new WebViewClient(){
boolean isFirstLoad = true;
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
if(AdManager.getInstance().hasAds() && isFirstLoad == false && AdManager.getInstance().interstitialIntervalExceeded())
AdManager.getInstance().showInterstitial(ctx);
isFirstLoad = false;
super.onPageStarted(view, url, favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if( url.startsWith("browser:") ){
launchBrowser( url.substring(8));
}else if( url.startsWith("market:") || url.endsWith(".pdf")){
launchBrowser( url );
}else if( url.startsWith("https://www.google.com/maps/") || url.startsWith("http://maps.google") || url.startsWith("https://maps.google")){
try {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
SectionManager.getInstance().getCurrentActivity().startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
}else if (url.startsWith("tel:")) {
try {
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
SectionManager.getInstance().getCurrentActivity().startActivity(intent);
} catch (Exception e) {
e.printStackTrace();
}
}else if(url.startsWith("mailto:")){
MailTo mt = MailTo.parse(url);
Intent intent = new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_EMAIL, new String[] { mt.getTo() });
intent.putExtra(Intent.EXTRA_TEXT, mt.getBody());
intent.putExtra(Intent.EXTRA_SUBJECT, mt.getSubject());
intent.putExtra(Intent.EXTRA_CC, mt.getCc());
intent.setType("message/rfc822");
SectionManager.getInstance().getCurrentActivity().startActivity(intent);
}
return true;
}
//This method launches the phone's Internet browser with the URL passed as parameter
//@param url
private void launchBrowser( String url ){
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse( url ));
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
ApplicationContextProvider.getContext().startActivity(i);
}
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
super.onReceivedSslError(view, handler, error);
Toast toast = Toast.makeText(SectionManager.getInstance().getCurrentActivity(), R.string.SSL_ERROR, Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
@Override
public void onPageFinished(WebView view, String url) {
String webUrl = webView.getUrl();
// This if solve a bug with (Facebook plugins for web pages) like buttons or comments
if (url.startsWith("https://m.facebook.com/plugins/close_popup.php")) {
view.goBack();
return;
}
super.onPageFinished(view, webUrl);
}
});
这是启动相机的方法：
/**
* Launch an selection of all available ACTION_PICK "gallery" intents (external APP) to select an file.
* Also add the IMAGE_CAPTURE "camera" intent to selection if the device has an camera.
* If they don't have an APP of type ACTION_PICK, they try to launch an APP of type IMAGE_CAPTURE
* @param onActivityResultCode the result code returned to onActivityResult when the intent has finish his job
*/
public static void launchExternalCameraGalleryChooserApp(int onActivityResultCode){
Activity activity = SectionManager.getInstance().getCurrentActivity();
Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if(galleryIntent.resolveActivity( activity.getPackageManager()) != null ) {
Intent[] intentArray = new Intent[0];
if(takePictureIntent.resolveActivity( activity.getPackageManager()) != null ){
intentArray = new Intent[] { takePictureIntent };
}
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, galleryIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
activity.startActivityForResult(chooserIntent, onActivityResultCode);
} else if(takePictureIntent.resolveActivity( activity.getPackageManager()) != null ) {
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, galleryIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Camera Chooser");
activity.startActivityForResult(takePictureIntent, onActivityResultCode);
}
}
这是我的onActivityResult方法的来源：
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
switch (requestCode){
case Constants.WEB_INPUT:
if(Build.VERSION.SDK_INT >= 21) {
Uri[] results = null;
if (resultCode == Activity.RESULT_OK) { //&& intent != null
if (uploadMsgCopy == null) {
return;
}
if (intent != null) {
String dataString = intent.getDataString();
if (dataString != null)
results = new Uri[]{Uri.parse(dataString)};
}
}
uploadMsgCopy.onReceiveValue(results);
uploadMsgCopy = null;
}
break;
default:
super.onActivityResult(requestCode, resultCode, intent);
break;
}
}