Android : Get Timing Information About Key Events?

I'm doing my thesis work on resource management on android and I want to be able to measure the "responsiveness" of an application to figure out if the application get enough resources and is scheduled often enough.

So what I want is a way to insert timestamps on events, e.g. button clicks, when they are created and when they are consumed. This way I can get the "responsiveness" of the application. But I have a hard time of finding exactly where the events are created and also consumed.

In Handler.java there is the handleCallback(Message message) method which I can insert the end time stamp. I tried to add a long variable in the Message class and that worked well (had to rebuild the api though). So my problem is to find the place where the button click is generated and where the message that corresponds to that event is being created so I can add a time stamp.

I also welcome other suggestions on how to measure the "responsiveness" of an application or other way to measure how well an application performs.