使用JDBC从Android连接到MySQL

我用下面的代码连接MySQL在localhost从Android系统。它仅显示catch部分中给出的操作。我不知道这是否是连接问题。

package com.test1;

import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet;

import android.app.Activity; import android.os.Bundle; import android.widget.TextView;

public class Test1Activity extends Activity { /** Called when the activity is first created. */ String str="new"; static ResultSet rs; static PreparedStatement st; static Connection con;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final   TextView tv=(TextView)findViewById(R.id.user);

    try
    {
        Class.forName("com.mysql.jdbc.Driver");
          con=DriverManager.getConnection("jdbc:mysql://10.0.2.2:8080/example","root","");
        st=con.prepareStatement("select * from country where id=1");
        rs=st.executeQuery();
         while(rs.next())
         {
         str=rs.getString(2);


         }


        tv.setText(str);
        setContentView(tv);
    }
    catch(Exception e)
    {
        tv.setText(str);
    }
}

} 执行此代码后，它将在avd中显示“新”。

java.lang.management.ManagementFactory.getThreadMXBean, referenced from method com.mysql.jdbc.MysqlIO.appendDeadlockStatusInformation Could not find class 'javax.naming.StringRefAddr', referenced from method com.mysql.jdbc.ConnectionPropertiesImpl$ConnectionProperty.storeTo Could not find method javax.naming.Reference.get, referenced from method com.mysql.jdbc.ConnectionPropertiesImpl$ConnectionProperty.initializeFrom 谁能提出一些解决方案？并预先感谢