Postgresql不连接到android，使用JDBC抛出org.postgresql.util。PSQLException:连接尝试失败。

I am developing an android application for which I need to connect to Postgresql database, I installed it 9.3 version, and checked in PGAdminIII it is connecting. I also created a java project in eclipse just for testing JDBC it is connecting successfully but when I am trying to connet to Postgresql from Android project it is throwing error: org.postgresql.util.PSQLException: The connection attempt failed. Here is the code Which I written in MainActivity.javaI am developing an android application for whic