Android处理程序定期 [英] Android Handler Periodically

问题描述

我想实现的目标:

1. 活动从没有ClickListener开始，并且具有四个带有白色背景的文本视图

1. An activity starts with no ClickListener and has four textviews all with white background

我想将textview 1的颜色更改为蓝色.等待2秒钟，然后将其更改为白色，然后将textview 2更改为蓝色.等待2秒钟，然后将其更改为白色...等等，直到我将textview 4更改为蓝色，然后又更改为白色.

I want to change the color of textview 1 to blue. Wait for 2 seconds and then change it back to white and change the textview 2 to blue. wait for 2 seconds and then change it back to white... so on till i have turned textview 4 to blue and back to white.

完成后，我想添加ClickListener并等待用户输入.

Once that is complete, I want to add the ClickListener and wait for user input.

我该如何实现?我是Android的新手，但了解点点滴滴.

How can I achieve this? I am new to Android but understands bits and pieces.

推荐答案

无需为此创建线程或动画.

There is no need to create a thread for this, or animations.

解决方案非常简单:使用Handler.postDelayed()或Handler.sendMessageDelayed():

The solution is really simple: use Handler.postDelayed() or Handler.sendMessageDelayed():

http://developer.android. com/reference/android/os/Handler.html#postDelayed(java.lang.Runnable ，长) http://developer.android.com/reference/android/os/Handler.html#sendMessageDelayed(android.os.Message ，长)

为实现可靠的实现，请确保至少通过Activity.onDestroy()删除所有待处理的消息. (或者，如果要在Activity.onStart()中发布它们，请在Activity.onStop()中将其删除；如果要在Activity.onResume()中发布，则将其在Activity.onPause()中删除.)

For a robust implementation, be sure to remove any pending messages at least by Activity.onDestroy(). (Or if you are posting them in Activity.onStart(), remove them in Activity.onStop(); if posting in Activity.onResume(), remove in Activity.onPause().)

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