当一个线程在运行的时候，不管是上传还是下载，你可以查询进程状态并且给用户一个反馈（例如一个进度条）。

While a thread is running, either uploading or downloading, you can query it to check on its status to provide the user with feedback (e.g. a progress bar).

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当一个线程在运行的时候，不管是上传还是下载，你可以查询进程状态并且给用户一个反馈(例如一个进度条)。

While a thread is running, either uploading or downloading, you can query it to check on its status to provide the user with feedback (eg. a progress bar).

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进度条和进度消息用于表示splash Screen的进程状态。

Progress bar and Progress message are used to indicate the process status on the splash screen.

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