how enable multiple file upload in webview android 4.4 and up

Issue

I'm using html input tag. I'm trying to upload up to 5 files. Code is working for single file upload.
How can I enable multiple file upload in webview android 4.4 and up?

intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true); 

This only multiple allows selecting files but it doesn't work

ValueCallback<Uri> mUploadMessage;
final int FILECHOOSER_RESULTCODE = 3;
final int REQUEST_SELECT_FILE = 32;
ValueCallback uploadMessage;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().requestFeature(Window.FEATURE_PROGRESS);
    setTheme(R.style.AppTheme);
    setContentView(R.layout.activity_main);

    Uri uriUrl = Uri.parse("https://contactde.com/");
    webview = findViewById(R.id.webView);
    webview.getSettings().setUseWideViewPort(true);

    webview.setWebChromeClient(new WebChromeClient() {
        @Override
        public void onProgressChanged(WebView view, int newProgress) {
            super.onProgressChanged(view, newProgress);
            if (newProgress >= 100) {
                pd.cancel();
            } else {
                pd.setMessage("Loading " + newProgress + "%");
                pd.show();
            }

        }

        @Override
        public void onGeolocationPermissionsShowPrompt(String origin,
                                                       GeolocationPermissions.Callback callback) {

            callback.invoke(origin, true, false);
        }


        // For Android 3.0+
        public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("*/*");
            i.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true);
            MainActivity.this.startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE);
        }

        //For Android 4.1+ only
        protected void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
            mUploadMessage = uploadMsg;
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true);
            intent.addCategory(Intent.CATEGORY_OPENABLE);
            intent.setType("*/*");
            startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);
        }

        protected void openFileChooser(ValueCallback<Uri> uploadMsg) {
            mUploadMessage = uploadMsg;
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("*/*");
            startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
        }

        // For Lollipop 5.0+ Devices
        public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
            if (uploadMessage != null) {
                uploadMessage.onReceiveValue(null);
                uploadMessage = null;
            }

            uploadMessage = filePathCallback;
            Intent intent = null;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                intent = fileChooserParams.createIntent();
                intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true);
            }
            try {
                startActivityForResult(intent, REQUEST_SELECT_FILE);
            } catch (ActivityNotFoundException e) {
                uploadMessage = null;
                Toast.makeText(getApplicationContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();
                return false;
            }
            return true;
        }

        @Override
        public boolean onJsAlert(WebView view, String url, String message, JsResult result) {

            Log.d("LogTag", message);
            result.confirm();
            return true;
        }

    });
    webview.setWebViewClient(new CustomWebViewClient());
    webview.getSettings().setJavaScriptEnabled(true);
    webview.getSettings().setGeolocationEnabled(true);
    webview.getSettings().setAllowFileAccess(true);
    webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);

    webview.clearCache(true);
    webview.loadUrl(uriUrl.toString());


}


private class CustomWebViewClient extends WebViewClient {
    @Override
    public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
        Toast.makeText(MainActivity.this, "Something Wrong", Toast.LENGTH_LONG).show();
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView wv, String url) {
        Log.e("Url", url);
        if (url.startsWith("tel:")) {
            Intent intent = new Intent(Intent.ACTION_DIAL);
            intent.setData(Uri.parse(url));
            startActivity(intent);
            return true;
        } else if (url != null && url.startsWith("https://wa.me/")) {
            Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
            startActivity(myIntent);
            return true;
        } else {
            return false;
        }
    }
}


@Override
public void onBackPressed() {
    if (webview.canGoBack()) {
        webview.goBack();
    } else {
        super.onBackPressed();
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    // Forward results to EasyPermissions
    EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_SELECT_FILE) {
        if (uploadMessage == null) return;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, data));
        }
        uploadMessage = null;
    } else if (requestCode == FILECHOOSER_RESULTCODE) {
        if (null == mUploadMessage)
            return;
        // Use MainActivity.RESULT_OK if you're implementing WebView inside Fragment
        // Use RESULT_OK only if you're implementing WebView inside an Activity
        Uri result = data == null || resultCode != MainActivity.RESULT_OK ? null : data.getData();
        mUploadMessage.onReceiveValue(result);
        mUploadMessage = null;
    }
}

Solution

figured out

Link Here

and just add

i.putExtra(Intent.EXTRA_ALLOW_MULTIPLE,true); 

Answered By - Morpheus