com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to

控制台报：com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.

解决方法：

在android studio 连接 mysql时出现这个错误说明你在activity中引用的dao没有放入线程thread 中

 final Handler handler=new Handler(){

            @Override

            public void handleMessage(@NonNull Message msg) {

                super.handleMessage(msg);

            }

        }；

        Thread thread=new Thread(new Runnable() {

            @Override

            public void run() {

                //这里放入引用到的语句

            }

        });

        thread.start();