android通过JDBC连接本地Mysql总是出错

ip地址我换了好几个，因为连接WIFI用ipconfig查地址。此时试了的Ip地址为百度查询的，但都错了
并且我也build mysql-connect.jar包，最后log总打印连接出错，就是走了catch，没有走try
在mysql中也创建了ming数据库，也加入mark用户，密码。
代码如下：
package com.example.mysql_connect;

import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import java.sql.Connection;
import java.sql.SQLException;
import android.app.Activity;
import android.os.Bundle;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class MainActivity extends Activity {
private static final String REMOTE_IP = "113.57.27.87:3306";或者192.168.155.5:3306
private static final String URL = "jdbc:mysql://" + REMOTE_IP + "/ming";
private static final String USER = "mark";
private static final String PASSWORD = "123456";
private Connection conn;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

new Thread() {
public void run() {
try {
conn = null;
final String DRIVER_NAME = "com.mysql.jdbc.Driver";
Class.forName(DRIVER_NAME);
conn = DriverManager.getConnection(URL, USER, PASSWORD);
conn.close();
} catch (ClassNotFoundException e) {
System.out.println("连接出错！");
} catch (SQLException e) {
conn = null;
}

}
}.start();
}
}