使用时钟更新TextView

本文介绍了使用时钟更新TextView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我一直在尝试创建一个程序，该程序将输出一个有效的数字时钟，使我可以快速访问日期和时间。我有解析时间的代码，但是，更新文本视图时遇到困难。我有这个：

I have been trying to create a program that will output a working digital clock that will allow me to quickly access the date and time. I have the code to parse the time, however, I'm having difficulty updating the textview. I have this:

`public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); timer = (TextView)findViewById(R.id.timer); time = new Time(); time.setToNow(); timeString = time.toString(); changeTime = Parser(timeString); time.setToNow(); timeString = time.toString(); changeTime = Parser(timeString); timer.setText(changeTime); } private String Parser(String time){ String year = time.substring(0, 4); String month = time.substring(4,6); String day = time.substring(6, 8); String hour = time.substring(9,11); String minute = time.substring(11, 13); String second = time.substring(13, 15); String finalTime = hour + ":" + minute + ":" + second + " " + day + " " + month + " " + year; //String finalTime = second; return finalTime; }`

如何将其放入循环以不断更新textview。

How do I put this in a loop to constantly update the textview.

谢谢您能给我的帮助。

推荐答案

声明一个处理程序以更新UI线程上的TextView。

Declare a Handler to update the TextView on the UI thread.

private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { time = new Time(); time.setToNow(); timeString = time.toString(); changeTime = Parser(timeString); timer.setText(changeTime); } };

启动一个TimeTask，它将更新您的TextView

Start a TimeTask that will update your TextView

int initialDelay = 1000; //first update in miliseconds int period = 5000; //nexts updates in miliseconds Timer timer = new Timer(); TimerTask task = new TimerTask() { public void run() { Message msg = new Message(); mHandler.sendMessage(msg); } }; timer.scheduleAtFixedRate(task, initialDelay, period);