Change Toast Font

From the official documentation:

Create your custom ToastView

If a simple text message isn't enough, you can create a customized layout for your toast notification. To create a custom layout, define a View layout, in XML or in your application code, and pass the root View object to the setView(View) method.

Following the link to the official Google Documentation will provide examples.

The answer is here: https://stackoverflow.com/a/13231981

After refactoring a little:

    Toast toast = Toast.makeText(context, R.string.yummyToast, Toast.LENGTH_SHORT);
    LinearLayout toastLayout = (LinearLayout) toast.getView();
    TextView toastTV = (TextView) toastLayout.getChildAt(0);
    toastTV.setTextSize(30);
    toast.show();

This worked for me like a charm!