在Android中，我们可以编写下面的kotlin代码来延迟任何函数的执行

class MainActivity : AppCompatActivity() {

private lateinit var handler: Handler

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    handler= Handler()
    handler.postDelayed({
        doSomething()
    },2000)
}

private fun doSomething() {
    Toast.makeText(this,"Hi! I am Toast Message",Toast.LENGTH_SHORT).show()
}
}

对于简单行句柄Post延迟，您可以执行以下操作:

new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        // Do someting
    }
}, 3000);

我希望这对你们有帮助

5秒后在UI线程中执行一些东西:

new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
    @Override
    public void run() {
        //Do something here
    }
}, 5000);

芬兰湾的科特林 从一个片段运行onuithread 计时器

例子:

Timer().schedule(500) {
    activity?.runOnUiThread {
        // code                                    
    }
}

每个人似乎都忘记在发布新的可运行文件或消息之前清理处理程序。否则，它们可能会累积并导致不良行为。

handler.removeMessages(int what);
// Remove any pending posts of messages with code 'what' that are in the message queue.

handler.removeCallbacks(Runnable r)
// Remove any pending posts of Runnable r that are in the message queue.

你可以使用新引入的lambda表达式让它更简洁:

new Handler().postDelayed(() -> {/*your code here*/}, time);