java - 如何在android中获取屏幕/手机时间？

Question

我正在尝试找出如何在android中获取屏幕时间，即花在手机上的时间。有没有这样的功能，或者我必须自己跟踪它。我尝试过寻找类似的问题，但没有成功。它是如何完成的？

Answer 1

1. Create a base activity and make your starting main activity on which the app is 
 killed when the user destroys it and there extend from it.

long start = Calendar.getInstance().getTimeInMillis();
long end = Calendar.getInstance().getTimeInMillis();

2. In the ondestroy of this activity     long total = end-start;
    write this code.