Hello. I've implemented the bulletin board through webview using gnuboard as Android Studio. The file attachment function is not working.<Help me.>

 private ValueCallback<Uri> mUploadMessage;
private static final int FILECHOOSER_RESULTCODE   = 1000;

webView.setWebChromeClient(new WebChromeClient() {
// In order to work with ICS, you need to put in the method below. 
public void openFileChooser(ValueCallback<Uri> uploadFile, String acceptType) {
openFileChooser(uploadFile);
}

public void openFileChooser(ValueCallback<Uri> uploadMsg) {
mUploadMessage = uploadMsg;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("*/*");
startActivityForResult(Intent.createChooser(intent, "File Chooser"), RC_FILE_CHOOSE );
});

  // If you select a file from the SD card, the onActivityResult below will be called.
    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) { 
     if(requestCode==FILECHOOSER_RESULTCODE) {  
            if (null == this.mUploadMessage) {
                return;
            }

           Uri result=null;
           try{
                if (resultCode != RESULT_OK) {
                    result = null;
                } } else {

                    result = intent.getData(); 
                } 
            }
            catch(Exception e)
            {
                Toast.makeText(getApplicationContext(), "activity :"+e,
                 Toast.LENGTH_LONG).show();
            }

            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;

     }
    }