我需要从设备中选择图像并将其上传到服务器。第一次，当我选择图像时，onShowFileChooser（）被调用，一切正常。但是，当我再次尝试点击上传时，onShowFileChooser（）永远不会被调用。但它适用于非棒棒糖设备。每当我点击上传时，都会调用openFileChoser（）。有什么我想念的吗？这是我的代码：
//Needed for file upload feature
vWebView.setWebChromeClient(new WebChromeClient() {
// file upload callback (Android 2.2 (API level 8) -- Android 2.3 (API level 10)) (hidden method)
public void openFileChooser(ValueCallback<Uri> filePathCallback) {
showAttachmentDialog(filePathCallback);
}
// file upload callback (Android 3.0 (API level 11) -- Android 4.0 (API level 15)) (hidden method)
public void openFileChooser(ValueCallback filePathCallback, String acceptType) {
showAttachmentDialog(filePathCallback);
}
// file upload callback (Android 4.1 (API level 16) -- Android 4.3 (API level 18)) (hidden method)
public void openFileChooser(ValueCallback<Uri> filePathCallback, String acceptType, String capture) {
showAttachmentDialog(filePathCallback);
}
// file upload callback (Android 5.0 (API level 21) -- current) (public method)
// for Lollipop, all in one
@Override
public boolean onShowFileChooser(
WebView webView, ValueCallback<Uri[]> filePathCallback,
WebChromeClient.FileChooserParams fileChooserParams) {
// Double check that we don't have any existing callbacks
if (mFilePathCallbackArray != null) {
mFilePathCallbackArray.onReceiveValue(null);
}
mFilePathCallbackArray = filePathCallback;
// Set up the take picture intent
if (mTypeCap == IMAGE) {
Intent takePictureIntent = pictureIntentSetup();
return showChooserDialog(takePictureIntent);
}
//set up video capture intent
else {
Intent takeVideoIntent = videoIntentSetUp();
return showChooserDialog(takeVideoIntent);
}
}
});
//For lollypop
private Intent pictureIntentSetup() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getActivity().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("Failed", "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;
}
}
return takePictureIntent;
}
//For lollypop
private Intent videoIntentSetUp() {
Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
if (takeVideoIntent.resolveActivity(getActivity().getPackageManager()) != null) {
// create the file where the video should go
File videoFile = null;
try {
videoFile = createVideoFile();
takeVideoIntent.putExtra("PhotoPath", mCameraPhotoPath);
} catch (IOException ex) {
// Error occurred while creating the File
Log.e("Failed", "Unable to create Video File", ex);
}
// continue only if the file was successfully created
if (videoFile != null) {
mCameraPhotoPath = "file:" + videoFile.getAbsolutePath();
takeVideoIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(videoFile));
} else {
takeVideoIntent = null;
}
}
return takeVideoIntent;
}
//For lollypop
private boolean showChooserDialog(Intent intent) {
Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
if (mTypeCap.equalsIgnoreCase(IMAGE))
contentSelectionIntent.setType(IMAGE);
else
contentSelectionIntent.setType(VIDEO);
Intent[] intentArray;
if (intent != null) {
intentArray = new Intent[]{intent};
} else {
intentArray = new Intent[0];
}
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
if (mTypeCap.equalsIgnoreCase(IMAGE))
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
else
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Video Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
getActivity().startActivityForResult(chooserIntent, FILE_CHOOSER_RESULT_CODE);
return true;
}
活动的OnActivityResult：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//File upload related
if (requestCode == NewsDetailFragment.FILE_CHOOSER_RESULT_CODE && (resultCode == RESULT_OK || resultCode == RESULT_CANCELED)) {
Fragment fragment = getSupportFragmentManager()
.findFragmentById(R.id.container);
if (fragment != null && fragment instanceof DetailFragment) {
Fragment currentFragment = ((DetailFragment) fragment).getCurrentFragment();
if (currentFragment instanceof WebDetailFragment)
currentFragment.onActivityResult(requestCode, resultCode, data);
}
}
}
}
片段的onActivityResult：
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intentData) {
super.onActivityResult(requestCode, resultCode, intentData);
// code for all versions except of Lollipop
if (!Utility.isLollypopAndAbove()) {
Uri result = null;
// check that the response is a good one
if (resultCode == Activity.RESULT_OK) {
if (requestCode == FILE_CHOOSER_RESULT_CODE) {
if (null == this.mFilePathCallback) {
return;
}
if (null == mFilePathCallback) return;
if (intentData == null) {
// if there is not data, then we may have taken a photo
if (mCameraPhotoPath != null) {
result = Uri.parse(mCameraPhotoPath);
}
} else {
String dataString = intentData.getDataString();
if (dataString != null) {
result = Uri.parse(dataString);
}
}
// Uri result = intentData == null || resultCode != Activity.RESULT_OK ? null
// : intentData.getData();
}
// for Lollipop only
}
mFilePathCallback.onReceiveValue(result);
mFilePathCallback = null;
}
else {
Uri[] results = null;
// check that the response is a good one
if(resultCode==Activity.RESULT_OK) {
if (requestCode == FILE_CHOOSER_RESULT_CODE) {
if (null == mFilePathCallbackArray) {
return;
}
if (intentData == null) {
// if there is not data, then we may have taken a photo
if (mCameraPhotoPath != null) {
results = new Uri[]{Uri.parse(mCameraPhotoPath)};
}
} else {
String dataString = intentData.getDataString();
if (dataString != null) {
results = new Uri[]{Uri.parse(dataString)};
}
}
}
}
mFilePathCallbackArray.onReceiveValue(results);
mFilePathCallbackArray = null;
return;
}
}
答案 0 :(得分：19)
首先，对不起我的英语。你应该将空的Uri [] {}返回给文件接收
mUploadMessageForAndroid5.onReceiveValue(new Uri[]{});
private static final int REQUEST_GET_THE_THUMBNAIL = 4000;
private static final long ANIMATION_DURATION = 200;
public final static int FILECHOOSER_RESULTCODE = 1;
public final static int FILECHOOSER_RESULTCODE_FOR_ANDROID_5 = 2;
//JS
webView.getSettings().setJavaScriptEnabled(true);
//set ChromeClient
webView.setWebChromeClient(getChromeClient());
//ChromeClinet配置
private WebChromeClient getChromeClient() {
return new WebChromeClient() {
//3.0++
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
openFileChooserImpl(uploadMsg);
}
//3.0--
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
openFileChooserImpl(uploadMsg);
}
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
openFileChooserImpl(uploadMsg);
}
// For Android > 5.0
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> uploadMsg, WebChromeClient.FileChooserParams fileChooserParams) {
openFileChooserImplForAndroid5(uploadMsg);
return true;
}
};
}
private void openFileChooserImpl(ValueCallback<Uri> uploadMsg) {
mUploadMessage = uploadMsg;
new AlertDialog.Builder(mActivity)
.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (items[which].equals(items[0])) {
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
} else if (items[which].equals(items[1])) {
dispatchTakePictureIntent();
}
dialog.dismiss();
}
})
.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
Log.v(TAG, TAG + " # onCancel");
mUploadMessage = null;
dialog.dismiss();
}})
.show();
}
private void openFileChooserImplForAndroid5(ValueCallback<Uri[]> uploadMsg) {
mUploadMessageForAndroid5 = uploadMsg;
new AlertDialog.Builder(mActivity)
.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (items[which].equals(items[0])) {
Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
contentSelectionIntent.setType("image/*");
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE_FOR_ANDROID_5);
} else if (items[which].equals(items[1])) {
dispatchTakePictureIntent();
}
dialog.dismiss();
}
})
.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
Log.v(TAG, TAG + " # onCancel");
//important to return new Uri[]{}, when nothing to do. This can slove input file wrok for once.
//InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.
mUploadMessageForAndroid5.onReceiveValue(new Uri[]{});
mUploadMessageForAndroid5 = null;
dialog.dismiss();
}}).show();
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(mActivity.getPackageManager()) != null) {
// File file = new File(createImageFile());
Uri imageUri = null;
try {
imageUri = Uri.fromFile(createImageFile());
} catch (IOException e) {
e.printStackTrace();
}
//temp sd card file
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(takePictureIntent, REQUEST_GET_THE_THUMBNAIL);
}
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/don_test/");
if (!storageDir.exists()) {
storageDir.mkdirs();
}
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
Log.v(TAG, TAG + " # onActivityResult # requestCode=" + requestCode + " # resultCode=" + resultCode);
if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == mUploadMessage)
return;
Uri result = intent == null || resultCode != Activity.RESULT_OK ? null : intent.getData();
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
} else if (requestCode == FILECHOOSER_RESULTCODE_FOR_ANDROID_5) {
if (null == mUploadMessageForAndroid5)
return;
Uri result;
if (intent == null || resultCode != Activity.RESULT_OK) {
result = null;
} else {
result = intent.getData();
}
if (result != null) {
Log.v(TAG, TAG + " # result.getPath()=" + result.getPath());
mUploadMessageForAndroid5.onReceiveValue(new Uri[]{result});
} else {
mUploadMessageForAndroid5.onReceiveValue(new Uri[]{});
}
mUploadMessageForAndroid5 = null;
} else if (requestCode == REQUEST_GET_THE_THUMBNAIL) {
if (resultCode == Activity.RESULT_OK) {
File file = new File(mCurrentPhotoPath);
Uri localUri = Uri.fromFile(file);
Intent localIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, localUri);
mActivity.sendBroadcast(localIntent);
Uri result = Uri.fromFile(file);
mUploadMessageForAndroid5.onReceiveValue(new Uri[]{result});
mUploadMessageForAndroid5 = null;
} else {
File file = new File(mCurrentPhotoPath);
Log.v(TAG, TAG + " # file=" + file.exists());
if (file.exists()) {
file.delete();
}
}
}
}
答案 1 :(得分：6)
面对类似问题我在方法onShowFileChooser中返回布尔值，当我调用超类方法时问题被修复
@Override
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
//Logic to implement
return super.onShowFileChooser(webView, filePathCallback, fileChooserParams);
}
答案 2 :(得分：2)
只需设置一个空值：
if (resultCode == Activity.RESULT_OK) {
handleImageRequest(data)
} else {
mValueCallbackArray?.onReceiveValue(null)
mValueCallbackArray = null
}
答案 3 :(得分：2)
我遇到了类似的问题，即 onShowFileChooser 只能工作一次。经过几个小时的跟踪和错误，然后我通过一个简单的实验得出了结论：
不调用 ValueCallback 将导致 onShowFileChooser 只工作一次。下面的代码只工作一次...
override fun onShowFileChooser(
view: WebView?,
filePath: ValueCallback<Array<Uri>>?,
fileChooserParams: FileChooserParams?
): Boolean {
Log.i("blah", "<== onShowFileChooser ==>")
// filePath?.onReceiveValue(null)
return true
}
正确调用 ValueCallback 将使 onShowFileChooser 每次都起作用：
override fun onShowFileChooser(
view: WebView?,
filePath: ValueCallback<Array<Uri>>?,
fileChooserParams: FileChooserParams?
): Boolean {
Log.i("blah", "<== onShowFileChooser ==>")
filePath?.onReceiveValue(null)
return true
}
所以我只检查所有分支并确保所有分支都正确调用 ValueCallback 然后 webview 按预期工作。
答案 4 :(得分：1)
我遇到了完全相同的问题，但是我的用例没有什么不同，但是我的webview加载在代码中的片段上。第一次文件选择器在Lollipop＆amp; pre Lollipop设备，但下次它无法自动显示文件选择器。原因是我第一次没有以适当的方式处理onActivityResult。我的工作代码片段如下为Lollipop：
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private boolean onActivityResultLolliPop(
int requestCode, int resultCode, Intent data) {
if (requestCode != SurveyWebChromeClient.FILE_CHOOSER_REQUEST_CODE
|| mFilePathCallbackL == null) {
super.onActivityResult(requestCode, resultCode, data);
return true;
}
Uri[] results = null;
if (resultCode == Activity.RESULT_OK) {
if (data == null) {
if (mCameraPhotoVideoPath != null) {//if there is not data here, then we may have taken a photo/video
results = new Uri[]{Uri.parse(mCameraPhotoVideoPath)};
}
} else {
String dataString = data.getDataString();
ClipData clipData = data.getClipData();
if (clipData != null) {
results = new Uri[clipData.getItemCount()];
for (int i = 0; i < clipData.getItemCount(); i++) {
ClipData.Item item = clipData.getItemAt(i);
results[i] = item.getUri();
}
}
if (dataString != null)
results = new Uri[]{Uri.parse(dataString)};
}
}
mFilePathCallbackL.onReceiveValue(results);
mFilePathCallbackL = null;
return false;
}
答案 5 :(得分：1)
让onShowFIleChooser()返回false，下次就可以使用
public boolean onShowFileChooser(){
...
return **false**;
}
答案 6 :(得分：0)
在onShowFileChooser（）方法中，只有当您使用true时，才应返回filePathCallback，这是最好的方法：
private ValueCallback<Uri[]> filePathCallback;
@Override
public boolean onShowFileChooser(
WebView webView, ValueCallback<Uri[]> filePathCallback,
WebChromeClient.FileChooserParams fileChooserParams) {
// do whatever you need to do, to show a file chooser/camera intent
this.filePathCallback = filePathCallback;
return true;
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
// Check for your correct requestCode from your intent here
if (resultCode == RESULT_CANCELED) {
// this is important, call the callback with null parameter
this.filePathCallback.onReceiveValue(null);
} else if (resultCode == RESULT_OK) {
// extract the uri(s) you need here
this.filePathCallback.onReceiveValue(new Uri[]{result});
}
}
答案 7 :(得分：0)
我遇到了同样的问题，问题是我希望看到一个OnActivityResult，但是当您按下“后退”按钮时，却没有触发。
该解决方案是在onResume上实现以下代码，以告知回调答案为空并且可以重复使用：
@Override
protected void onResume() {
super.onResume();
if (mFilePathCallbackArray == null)
return;
mFilePathCallbackArray.onReceiveValue(new Uri[]{});
mFilePathCallbackArray = null;
}