import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class DBUtil {

    private static String IP = "192.168.1.1";

    private static String DBName = "Test";

    private static String USER = "sa";

    private static String PWD = "123";

    /** 创建数据库对象 */

    private static Connection getSQLConnection() {

        Connection con = null;

        try {

            Class.forName("net.sourceforge.jtds.jdbc.Driver");

            //加上 useunicode=true;characterEncoding=UTF-8 防止中文乱码

            con = DriverManager.getConnection("jdbc:jtds:sqlserver://" + IP + ":1433/" + DBName + ";useunicode=true;characterEncoding=UTF-8", USER, PWD);

        } catch (ClassNotFoundException e) {

            e.printStackTrace();

        } catch (SQLException e) {

            e.printStackTrace();

        }

        return con;

    }

    /** 查询数据库 */

    public static String Query() {

        String result = "";

        try {

            Connection conn = getSQLConnection();

            String sql = "select * from SysUser";

            Statement stmt = conn.createStatement();//

            ResultSet rs = stmt.executeQuery(sql);

            while (rs.next()) {

                String s1 = rs.getString("UserCode");

                String s2 = rs.getString("RealName");

                result += s1 + "  -  " + s2 + "\n";

            }

            rs.close();

            stmt.close();

            conn.close();

        } catch (SQLException e) {

            e.printStackTrace();

            result += "查询数据异常!" + e.getMessage();

        }

        return result;

    }

}

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

    Button button;

    TextView textview;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button = (Button) findViewById(R.id.button);

        textview = (TextView) findViewById(R.id.textview);

        // 按钮点击事件

        button.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                textview.setText("");

                test();

            }

        });

    }

    // 查询

    private void test() {

        Runnable run = new Runnable() {

            @Override

            public void run() {

                String ret = DBUtil.Query();

                Message msg = new Message();

                msg.what = 1001;

                Bundle data = new Bundle();

                data.putString("result", ret);

                msg.setData(data);

                mHandler.sendMessage(msg);

            }

        };

        new Thread(run).start();

    }

    // 消息显示到控件

    Handler mHandler = new Handler() {

        public void handleMessage(android.os.Message msg) {

            switch (msg.what) {

            case 1001:

                String str = msg.getData().getString("result");

                textview.setText(str);

                break;

            default:

                break;

            }

        };

    };

}

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <uses-permission android:name="android.permission.INTERNET" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />