Android, with thread safety in mind, does not allow UI threads to be executed in threads, and in Android, there is a class: Android.os.Handler, which enables message delivery between threads everywhere. First look at the segment code, this instantiation of a handler,handler can communicate through a message on multiple threads, which is done in a timed Reclen plus 1, and then in a certain format, displayed on the Rectime (UI thread action).
1FinalHandler Handler=NewHandler () {
2PublicvoidHandlemessage (Message msg) {
3Switch(msg.what) {
4Case1:
5Reclen++;
6Rectime.settext (Getrectime (Reclen));
7Break;
8}
9 Super. Handlemessage (msg);
Ten }
one };
The following is an instantiation of a timertask, which is to provide a timer to execute the content. The addition of this method is to give handler a Send Message function, because this in the timer thread, cannot directly manipulate the UI thread.1TimerTask Task=NewTimerTask () {
2PublicvoidRun () {
3Message message=NewMessage ();
4Message.what= 1;
5 handler.sendmessage (message);
6 }
7 }; Add a timer to get the program up and running1Timer=NewTimer (True);
2Timer.schedule (Task,1000,1000);//Delay 1000ms after execution, 1000ms execution once
3 //timer.cancel (); // exit timer
