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// 创建一个线程来连接数据库并获取数据库中对应表的数据
new Thread(new Runnable() {
    @Override
    public void run() {
        // 调用数据库工具类DBUtils的getInfoByName方法获取数据库表中数据
        HashMap<String, Object> map = Databaseutil.getInfoByName("hh");

        Message message = handler.obtainMessage();
        if(map != null){
            String s = "";
            for (String key : map.keySet()){
                s += key + ":" + map.get(key) + "\n";
            }
            message.what = 0x12;
            message.obj = s;
        }else {
            message.what = 0x11;
            message.obj = "查询结果为空";
        }
        // 发消息通知主线程更新UI
        handler.sendMessage(message);
    }
}).start();


//写在成员变量中

@SuppressLint("HandlerLeak")
private Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {


        switch (msg.what){
            case 0x11:
                String s = (String) msg.obj;
                et.setText(s);
                break;
            case 0x12:
                String ss = (String) msg.obj;
                et.setText(ss);
                break;
        }


    }
};