从网上down文件的一个小应用，但是当点击按钮从网上下载东西时
报这个错误
04-25 12:17:25.319: E/ActivityThread(763): Service com.android.exchange.ExchangeService has leaked ServiceConnection [email protected]4148 that was originally bound here
04-25 12:17:25.319: E/ActivityThread(763): android.app.ServiceConnectionLeaked: Service com.android.exchange.ExchangeService has leaked ServiceConnection [email protected]4148 that was originally bound here
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