Android : startActivityForResult returns null for ICS, JB(4.1,4.2,4.3)

This is piece of code for File Upload in WebView-Android. This returns null for ICS and JB. File Chooser opens after selecting file activity crashes. What could be the problem? What should be code for KK? (Referred from GitHub(@GauntFace).

@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
Uri[] results = null;

// Check that the response is a good one
if (resultCode == Activity.RESULT_OK) {
    if (intent == 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 = intent.getDataString();
        if (dataString != null) {
            results = new Uri[] {
                Uri.parse(dataString)
            };
        }
    }
}

mFilePathCallback.onReceiveValue(results);
mFilePathCallback = null;
}

Following is code for openFileChooser:

webView.setWebChromeClient(new WebChromeClient() {
    // For Android 3.0+, ICS 4.0
    public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
        mUploadMessage = uploadMsg;
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.setType("*/*");
        Upload.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), Upload.FILECHOOSER_RESULTCODE);
    }

    // For Android 4.1+
    public void openFileChooser(ValueCallback < Uri > uploadMsg, String acceptType, String capture) {
        mUploadMessage = uploadMsg;
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.setType("*/*");
        Upload.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), Upload.FILECHOOSER_RESULTCODE);
    }

    // For Android 4.1+ (different params)
    public void openFileChooser(ValueCallback < Uri > uploadMsg) {
        mUploadMessage = uploadMsg;
        Intent i = new Intent(Intent.ACTION_GET_CONTENT);
        i.setType("*/*");
        Upload.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), Upload.FILECHOOSER_RESULTCODE);
    }
}
}