我需要从设备中选择图片并将其上传到服务器。第一次选择图片时，onShowFileChooser()被调用并且一切工作正常。但是，当我再次尝试点击上传时，onShowFileChooser()就不会被调用了。但是对于非棒棒糖设备来说，它是有效的。每次我点击上传时，都会调用openFileChoser()。我是否遗漏了什么。以下是我的代码：
//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;
}
在activity的OnActivityResult方法中：
@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);
}
}
}
}
fragment的onActivityResult方法：
@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;
}
}