取消Webview中的文件上传 [英] Cancel a file upload in a Webview
本文介绍了取消Webview中的文件上传的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我为网络视图中的文件上传器实施了此解决方案. 当我单击HTML中的选择文件"按钮时，它第一次启动选择来源"选项(例如照相机，画廊，文档等)，然后一切正常.如果我再做一次(做得好之后)，它就可以正常工作.但是，如果我取消此操作，请按Android的后退按钮，直到重新启动该应用程序之后，我才能再次上传文件. 这已经通过许多html文件上传器表单进行了测试，而且我总是遇到相同的问题.
I implemented this solution for a file uploader in a webview. When I click on the "select file" button in the HTML, the first time it launches the "Select Source" option (like camera, gallery, documents, etc) and everything goes right. If I do it again (after doing it good), it works normally. But if I cancel this operation, pressing the Android's back button, I can't upload a file again until I restart the app. This was tested with many html file uploader forms and always I have the same problem.
这是我的实现方式
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if (resultCode == RESULT_OK) {
// This is for Android 4.4.4- (JellyBean & KitKat)
if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == mUploadMessage) {
super.onActivityResult(requestCode, resultCode, intent);
return;
}
final boolean isCamera;
if (intent == null) {
isCamera = true;
} else {
final String action = intent.getAction();
if (action == null) {
isCamera = false;
} else {
isCamera = action.equals(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
}
}
Uri selectedImageUri;
if (isCamera) {
selectedImageUri = mOutputFileUri;
mUploadMessage.onReceiveValue(selectedImageUri);
mUploadMessage = null;
return;
} else {
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), intent.getData());
selectedImageUri = intent == null ? null : ImageUtility.savePicture(this, bitmap, 1400);
mUploadMessage.onReceiveValue(selectedImageUri);
mUploadMessage = null;
return;
} catch (IOException e) {
e.printStackTrace();
}
}
// And this is for Android 5.0+ (Lollipop)
} else if (requestCode == INPUT_FILE_REQUEST_CODE) {
Uri[] results = null;
// Check that the response is a good one
if (resultCode == Activity.RESULT_OK) {
if (intent == null) {
// If there is not data, then we may have taken a photo
if (mCameraPhotoPath != null) {
results = new Uri[]{Uri.parse(mCameraPhotoPath)};
}
} else {
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), intent.getData());
} catch (IOException e) {
e.printStackTrace();
}
Uri dataUri = ImageUtility.savePicture(this, bitmap, 1400);
if (dataUri != null) {
results = new Uri[]{dataUri};
}
}
}
mFilePathCallback.onReceiveValue(results);
mFilePathCallback = null;
return;
}
} else {
super.onActivityResult(requestCode, resultCode, intent);
return;
}
}
private class MyWebChromeClient extends WebChromeClient {
/**
* This is the method used by Android 5.0+ to upload files towards a web form in a Webview
*
* @param webView
* @param filePathCallback
* @param fileChooserParams
* @return
*/
@Override
public boolean onShowFileChooser(
WebView webView, ValueCallback<Uri[]> filePathCallback,
WebChromeClient.FileChooserParams fileChooserParams) {
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
}
mFilePathCallback = filePathCallback;
Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
contentSelectionIntent.setType("image/*");
Intent[] intentArray = getCameraIntent();
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Seleccionar Fuente");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(chooserIntent, INPUT_FILE_REQUEST_CODE);
return true;
}
@Override
public void onProgressChanged(WebView view, int newProgress) {
mProgressBar.setVisibility(View.VISIBLE);
WebActivity.this.setValue(newProgress);
super.onProgressChanged(view, newProgress);
}
@Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
Log.d("LogTag", message);
result.confirm();
return true;
}
/**
* Despite that there is not a Override annotation, this method overrides the open file
* chooser function present in Android 3.0+
*
* @param uploadMsg
* @author Tito_Leiva
*/
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
mUploadMessage = uploadMsg;
Intent i = getChooserIntent(getCameraIntent(), getGalleryIntent("image/*"));
i.addCategory(Intent.CATEGORY_OPENABLE);
WebActivity.this.startActivityForResult(Intent.createChooser(i, "Selecciona la imagen"), FILECHOOSER_RESULTCODE);
}
public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
Intent i = getChooserIntent(getCameraIntent(), getGalleryIntent("*/*"));
i.addCategory(Intent.CATEGORY_OPENABLE);
WebActivity.this.startActivityForResult(
Intent.createChooser(i, "Selecciona la imagen"),
FILECHOOSER_RESULTCODE);
}
/**
* Despite that there is not a Override annotation, this method overrides the open file
* chooser function present in Android 4.1+
*
* @param uploadMsg
* @author Tito_Leiva
*/
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
mUploadMessage = uploadMsg;
Intent i = getChooserIntent(getCameraIntent(), getGalleryIntent("image/*"));
WebActivity.this.startActivityForResult(Intent.createChooser(i, "Selecciona la imagen"), FILECHOOSER_RESULTCODE);
}
private Intent[] getCameraIntent() {
// Determine Uri of camera image to save.
Intent takePictureIntent = new Intent(WebActivity.this, CameraActivity.class);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath);
} catch (IOException ex) {
// Error occurred while creating the File
Log.e(TAG, "Unable to create Image File", ex);
}
// Continue only if the File was successfully created
if (photoFile != null) {
mCameraPhotoPath = "file:" + photoFile.getAbsolutePath();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
} else {
takePictureIntent = null;
}
}
Intent[] intentArray;
if (takePictureIntent != null) {
intentArray = new Intent[]{takePictureIntent};
} else {
intentArray = new Intent[0];
}
return intentArray;
}
private Intent getGalleryIntent(String type) {
// Filesystem.
final Intent galleryIntent = new Intent();
galleryIntent.setType(type);
galleryIntent.addCategory(Intent.CATEGORY_OPENABLE);
galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
return galleryIntent;
}
private Intent getChooserIntent(Intent[] cameraIntents, Intent galleryIntent) {
// Chooser of filesystem options.
final Intent chooserIntent = Intent.createChooser(galleryIntent, "Seleccionar Fuente");
// Add the camera options.
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents);
return chooserIntent;
}
}
private class MyWebViewClient extends WebViewClient {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
mUrl = url;
Log.i("URL", mUrl);
super.onPageStarted(view, url, favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
mUrl = url;
view.loadUrl(mUrl);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
mProgressBar.setVisibility(View.GONE);
}
}
推荐答案
我找到了解决方案.在onActivityResult()方法中，当resultCode不是RESULT_OK
I found the solution. In the onActivityResult() method is necessary give a null object to the uri callback, when the resultCode is not RESULT_OK
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
if (resultCode == RESULT_OK) {
// This is for Android 4.4.4- (JellyBean & KitKat)
if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == mUploadMessage) {
super.onActivityResult(requestCode, resultCode, intent);
return;
}
final boolean isCamera;
if (intent == null) {
isCamera = true;
} else {
final String action = intent.getAction();
if (action == null) {
isCamera = false;
} else {
isCamera = action.equals(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
}
}
Uri selectedImageUri;
if (isCamera) {
selectedImageUri = mOutputFileUri;
mUploadMessage.onReceiveValue(selectedImageUri);
mUploadMessage = null;
return;
} else {
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), intent.getData());
selectedImageUri = intent == null ? null : ImageUtility.savePicture(this, bitmap, 1400);
mUploadMessage.onReceiveValue(selectedImageUri);
mUploadMessage = null;
return;
} catch (IOException e) {
e.printStackTrace();
}
}
// And this is for Android 5.0+ (Lollipop)
} else if (requestCode == INPUT_FILE_REQUEST_CODE) {
Uri[] results = null;
// Check that the response is a good one
if (resultCode == Activity.RESULT_OK) {
if (intent == null) {
// If there is not data, then we may have taken a photo
if (mCameraPhotoPath != null) {
results = new Uri[]{Uri.parse(mCameraPhotoPath)};
}
} else {
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), intent.getData());
} catch (IOException e) {
e.printStackTrace();
}
Uri dataUri = ImageUtility.savePicture(this, bitmap, 1400);
if (dataUri != null) {
results = new Uri[]{dataUri};
}
}
}
mFilePathCallback.onReceiveValue(results);
mFilePathCallback = null;
return;
}
} else {
//for Android 5.0+
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
mFilePathCallback = null;
}
//for Android 4.4.4-
if (mUploadMessage != null) {
mUploadMessage.onReceiveValue(null);
mUploadMessage = null;
}
return;
}
}
这篇关于取消Webview中的文件上传的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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