附上原始碼：

public class MainActivity extends Activity {


private Button btn;
private TextView showTV;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        btn = (Button) findViewById(R.id.btn);
        showTV = (TextView) findViewById(R.id.showTV);
        
        btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

String str = linkSQL();
showTV.setText(str);
}
});
    }
    private String linkSQL() {

    String DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    String URL = "jdbc:sqlserver://localhost:1433;DatabaseName=my_data";
    String USER = "sa";
    String PWD = "123456";
    String result = null;
   
    try {
Class.forName(DRIVER);
Connection conn = DriverManager.getConnection(URL, USER, PWD);
result = "succeed";
} catch (ClassNotFoundException e) {
e.printStackTrace();
System.out.println(e.toString());
result = e.toString();
} catch (SQLException e) {
e.printStackTrace();
System.out.println(e.toString());
result = e.toString();
}
    return result;
} 
    
}

這就是原始碼，架包新增對了的，直接從資料庫管理軟體也能連線上資料庫，架包下也能找到SQLServerDriver.class這個類，就是一直報這個錯誤，求各位大神幫幫忙。