要关闭当前活动并启动另一项活动，如果用户没有做present屏幕上的任何工作。可以说我对活动1，我没有做任何工作，持续30秒。我想另一个活动说活性2会自动启动并完成活动1

To close the current activity and start another activity if the user does not do any work on the present screen. Say I am at Activity1 and I am not doing any work for 30 seconds. I want that another activity say Activity2 starts automatically and Activity1 finishes.

推荐答案

您可以创建一个变量和存储系统时间在里面活动1启动时。

You can create a variable and store the system time in it when Activity1 starts.

漱口当前系统时间此链接：的Andr​​oid获取当前时间和日期

Refer this link for current System time: Android get current time and date

然后您可以创建一个循环，并检查变量的值是否是从系统的当前时间小于30秒。如果是的话，你可以调用的方法。

Then you can create a loop and check whether the variable's value is less than 30 sec from the System's current time. If yes you can call a method.

在该方法就可以开始新的活动（活性2）。

In the method you can start the new activity (Activity2).

//To start new activity

Intent intent=new Intent(your_current_class.this,activity_you_want_to_call.class);

                                startActivity(intent);