Writing custom Android ViewAction to take screenshot

I'm trying to take a screenshot before I perform an action in Android using espresso.

protected T performAction(ViewAction viewAction) {
    ViewAction screenShotAction = new ScreenShotAction();
    viewInteraction.perform(screenShotAction);
    viewInteraction.perform(viewAction);
    return returnGeneric();
}

For example if in my test I perform a click() then I would take a screenshot of the device before I performed the click().

This is the code for taking the screenshot in the ScreenShotAction class

@Override
public void perform(UiController uiController, View view) {

    View rootView = view.getRootView();
    String state = Environment.getExternalStorageState();
    if(Environment.MEDIA_MOUNTED.equals(state)) {
        File picDir = new File(Environment.getExternalStorageDirectory() + "app_" + "test");

        if (!picDir.exists()) {
            picDir.mkdir();
        }

        rootView.setDrawingCacheEnabled(true);
        rootView.buildDrawingCache(true);
        Bitmap bitmap = rootView.getDrawingCache();
        String fileName = "test.jpg";
        File picFile = new File(picDir + "/" + fileName);

        try {
            picFile.createNewFile();
            FileOutputStream picOut = new FileOutputStream(picFile);
            bitmap = Bitmap.createBitmap(rootView.getWidth(), rootView.getHeight(), Bitmap.Config.ARGB_8888);
            boolean saved = bitmap.compress(Bitmap.CompressFormat.JPEG, 100, picOut);

            if (saved) {
                // good
            } else {
                // error
                throw  new Exception("Image not saved");
            }

            picOut.flush();
            picOut.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
        rootView.destroyDrawingCache();
    }
}

I do not see any image files in the phone's Pictures directory or any other directory. I believe the screenshot method is solid but am unsure if I am calling the method correctly.

Is viewInteraction.perform(screenShotAction) the corret way to call my custom view action?

Please help and thank you in advance.