WebView File Upload

WebViewFileUpload.java

      // For Android < 3.0
            @SuppressWarnings("unused")
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("*/*");

                startActivityForResult(Intent.createChooser(i, getString(R.string.select_file)), REQUEST_SELECT_FILE_LEGACY);

            }

            // For Android 3.0+
            @SuppressWarnings("unused")
            public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);

                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType(acceptType);

                startActivityForResult(Intent.createChooser(i, getString(R.string.select_file)), REQUEST_SELECT_FILE_LEGACY);
            }

            // For Android 4.1+
            @SuppressWarnings("unused")
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);

webView.setWebChromeClient(new WebChromeClient() {

            // For Android < 3.0
            @SuppressWarnings("unused")
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType("*/*");

                startActivityForResult(Intent.createChooser(i, getString(R.string.select_file)), REQUEST_SELECT_FILE_LEGACY);

            }

            // For Android 3.0+
            @SuppressWarnings("unused")
            public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);

                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType(acceptType);

                startActivityForResult(Intent.createChooser(i, getString(R.string.select_file)), REQUEST_SELECT_FILE_LEGACY);
            }

            // For Android 4.1+
            @SuppressWarnings("unused")
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                mUploadMessage = uploadMsg;

                Intent i = new Intent(Intent.ACTION_GET_CONTENT);

                i.addCategory(Intent.CATEGORY_OPENABLE);
                i.setType(acceptType);

                startActivityForResult(Intent.createChooser(i, getString(R.string.select_file)), REQUEST_SELECT_FILE_LEGACY);
            }

            // For Android 5.0+
            @SuppressLint("NewApi")
            public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
                if (mUploadMessage != null) {
                    mUploadMessage.onReceiveValue(null);
                    mUploadMessage = null;
                }

                mUploadMessageArr = filePathCallback;

                Intent intent = fileChooserParams.createIntent();

                try {
                    startActivityForResult(intent, REQUEST_SELECT_FILE);
                } catch (ActivityNotFoundException e) {
                    mUploadMessageArr = null;
                    return false;
                }

                return true;
            }

        });
        
        
      /////////////
            
    @SuppressLint("NewApi")
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == REQUEST_SELECT_FILE_LEGACY) {
            if (mUploadMessage == null) return;

            Uri result = data == null || resultCode != Activity.RESULT_OK ? null : data.getData();

            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;
        } else if (requestCode == REQUEST_SELECT_FILE) {
            if (mUploadMessageArr == null) return;

            mUploadMessageArr.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, data));
            mUploadMessageArr = null;
        }
    }

            

Hi. Where to add this code ? Please help me. I have code for webview and I want a file upload code. Please kindly help me in urgent

How to add this code on my existing webview I. Android studio???