onShowFileChooser() from android webview works only once

firstly, sorry to my english. you should return empty Uri[]{} to file receive

mUploadMessageForAndroid5.onReceiveValue(new Uri[]{});

my code can choose take photo or local image:

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;//JSwebView.getSettings().setJavaScriptEnabled(true);//set ChromeClientwebView.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;}@Overridepublic 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();            }        }    }}

Faced similar problem i was returning boolean value in method onShowFileChooser, issue was fixed when i called super class method

        @Override        public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {            //Logic to implement             return super.onShowFileChooser(webView, filePathCallback, fileChooserParams);        }

In the onShowFileChooser() method you should return true, only if you are using the filePathCallback, which is the best way:

private ValueCallback<Uri[]> filePathCallback;@Overridepublic 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;}@Overrideprotected 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});    }}