问题
Goal: to be able to attach a file of any type to a <input type="file" /> in a webview in Android 4.1+. (Android 5+ is fine)
I set openFileChooser as I saw fit based on few examples I have found. It works on 4.1 but not on 4.4.4 where the files attached do not have their filename correctly set.
Instead is set as filename the last path of the intent.mData return to onActivityResult, .e.g, for a mData value of content://com.android.providers.downloads.documents/document/2, the filename will be 2―without extension of course―while the name should be image.png.
What can I do to fix it? Would there be any problem in my code?
I do my testing on an emulator: Galaxy Nexus, API 19, target: Default
See code below.
webView.setWebChromeClient(new WebChromeClient() {
public void openFileChooser(ValueCallback<Uri> valueCallback, String acceptType, String capture) {
if (UseWebViewActivity.this.valueCallback != null) {
UseWebViewActivity.this.valueCallback.onReceiveValue(null);
}
UseWebViewActivity.this.valueCallback = valueCallback;
Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
contentSelectionIntent.setType("*/*");
startActivityForResult(Intent.createChooser(contentSelectionIntent,
getString(R.string.file_chooser_title)), INPUT_FILE_REQUEST_CODE);
}
});
// ...
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == INPUT_FILE_REQUEST_CODE && valueCallback != null) {
Uri result = null;
if (resultCode == Activity.RESULT_OK) {
result = intent.getData();
}
valueCallback.onReceiveValue(result);
valueCallback = null;
}
}
回答1:
The problem is in the onActivityResult() method for KitKat which returns the URI. You need to get the realpath of the imagefile.
Notice how i get the Real Path of the IMG by calling :
KitkatPath = Uri.parse("file://"+getPath(MobilestyxAppActivity.this, result)); in the onActivityResult().
You must add the string "file://" for it to work.
PS : I have gathered the code from various sources and modified it.
Look at my code below which works for Kitkat & Lolipop and other low versions of Android.
/** CODE FOR FILE UPLOAD*/
private static final int INPUT_FILE_REQUEST_CODE = 1;
private static final int FILECHOOSER_RESULTCODE = 1;
private ValueCallback<Uri> mUploadMessage;
private Uri mCapturedImageURI = null;
private ValueCallback<Uri[]> mFilePathCallback;
private String mCameraPhotoPath;
Uri KitkatPath ;
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if (requestCode != INPUT_FILE_REQUEST_CODE || mFilePathCallback == null) {
super.onActivityResult(requestCode, resultCode, data);
return;
}
Uri[] results = null;
// Check that the response is a good one
if (resultCode == Activity.RESULT_OK) {
if (data == 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 = data.getDataString();
if (dataString != null) {
results = new Uri[]{Uri.parse(dataString)};
}
}
}
mFilePathCallback.onReceiveValue(results);
mFilePathCallback = null;
}
else if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
System.out.println("In KitKat Condition");
if (requestCode != FILECHOOSER_RESULTCODE || mUploadMessage == null) {
System.out.println("In != Null");
super.onActivityResult(requestCode, resultCode, data);
return;
}
if (requestCode == FILECHOOSER_RESULTCODE) {
System.out.println("requestCode == FileChooser ResultCode");
if (null == this.mUploadMessage) {
System.out.println("In null == this.mUploadMessage");
return;
}
Uri result = null;
try {
if (resultCode != RESULT_OK) {
result = null;
} else {
//newcode
// retrieve from the private variable if the intent is null
result = data == null ? mCapturedImageURI : data.getData();
KitkatPath = Uri.parse("file://"+getPath(MobilestyxAppActivity.this, result));
System.out.println("KitkatPath== "+KitkatPath);
System.out.println("result = "+result);
}
} catch (Exception e) {
// Toast.makeText(getApplicationContext(), "activity :" + e, Toast.LENGTH_LONG).show();
e.printStackTrace();
}
// mUploadMessage.onReceiveValue(result);
mUploadMessage.onReceiveValue(KitkatPath);
System.out.println("mUploadMessage = "+mUploadMessage);
mUploadMessage = null;
}
}
return;
}
/** CODE FOR FILE UPLOAD*/
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[] {
split[1]
};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
public static String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {
column
};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date(heightDiff));
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File imageFile = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
return imageFile;
}
& now in the WebViewChromeClient ---
browser.setWebChromeClient(new WebChromeClient() {
// For Android 5.0
public boolean onShowFileChooser(WebView view, ValueCallback<Uri[]> filePath, WebChromeClient.FileChooserParams fileChooserParams) {
System.out.println("in 5.0");
// Double check that we don't have any existing callbacks
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
}
mFilePathCallback = filePath;
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
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 contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
contentSelectionIntent.setType("image/*");
Intent[] intentArray;
if (takePictureIntent != null) {
intentArray = new Intent[]{takePictureIntent};
} else {
intentArray = new Intent[0];
}
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(chooserIntent, INPUT_FILE_REQUEST_CODE);
return true;
}
// openFileChooser for Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
System.out.println("in 3.0+");
mUploadMessage = uploadMsg;
// Create AndroidExampleFolder at sdcard
// 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);
}
// openFileChooser for Android < 3.0
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
System.out.println("in <3.0");
openFileChooser(uploadMsg, "");
}
// openFileChooser for other Android versions
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType, String capture) {
System.out.println("in OTHER");
openFileChooser(uploadMsg, acceptType);
}
回答2:
Try using aFileChooser to avoid complications with API Level compatibilities (the library has it handled):
aFileChooser is an Android Library Project that simplifies the process of presenting a file chooser on Android 2.1+.
Intents provide the ability to hook into third-party app components for content selection. This works well for media files, but if you want users to be able to select any file, they must have an existing "file explorer" app installed. Because many Android devices don't have stock File Explorers, the developer must often instruct the user to install one, or build one, themselves. aFileChooser solves this issue.
Features:
Full file explorer Simplify GET_CONTENT Intent creation Hooks into Storage Access Framework Determine MIME data types Follows Android conventions (Fragments, Loaders, Intents, etc.) Supports API 7+
Check the readme.md on The repo's GitHub page for setup and usage instructions.
回答3:
Android 4.1 and 4.4 have different workings here since Storage Access Framework was introduced in Android 4.4 (API level 19). To retrieve the file name, you can try something like this:
Uri uri = intent.getData();
File imageFile = new File(uri);
if(imageFile.exists()){
String name = imageFile.getName();
}
来源：https://stackoverflow.com/questions/34892059/filename-are-missing-for-openfilechooser-android-4-4-4