导致错误的原因有很多种。

There are many possible reasons why this caused an error.

1. 未建立连接
2. 价值错误

..等等。实际问题出在您的控制台中;或者用于Logcat中的Android开发。你应该看看为什么引发异常。然后，解决该异常的原因。

.. and so on. The actual problem is in your Console; or for Android development in Logcat. You should see for why the exception got raised. Then, solve that exception's cause.