Show the result when a print request is made with success or failure.

这个 Issue 没有描述。

The issue lacks a description; start by examining the existing print request handling code in the Android app to understand the current flow. Look for classes related to printing, success/failure callbacks, and UI feedback mechanisms. Determine where to add result display logic, such as a Toast or Snackbar, and verify the change by testing a print request.

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