I want to make a pause between two lines of code, Let me explain a bit:
-> the user clicks a button (a card in fact) and I show it by changing the background of this button:
thisbutton.setBackgroundResource(R.drawable.icon);
-> after let's say 1 second, I need to go back to the previous state of the button by changing back its background:
thisbutton.setBackgroundResource(R.drawable.defaultcard);
-> I've tried to pause the thread between these two lines of code with:
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
However, this does not work. Maybe it's the process and not the Thread that I need to pause?
I've also tried (but it doesn't work):
new Reminder(5);
With this:
public class Reminder {
Timer timer;
public Reminder(int seconds) {
timer = new Timer();
timer.schedule(new RemindTask(), seconds*1000);
}
class RemindTask extends TimerTask {
public void run() {
System.out.format("Time's up!%n");
timer.cancel(); //Terminate the timer thread
}
}
}
How can I pause/sleep the thread or process?
Best Answer
One solution to this problem is to use the Handler.postDelayed() method. Some Google training materials suggest the same solution.
However, some have pointed out that the solution above causes a memory leak because it uses a non-static inner and anonymous class which implicitly holds a reference to its outer class, the activity. This is a problem when the activity context is garbage collected.
A more complex solution that avoids the memory leak subclasses the
Handler
andRunnable
with static inner classes inside the activity since static inner classes do not hold an implicit reference to their outer class:Note that the
Runnable
uses a WeakReference to the Activity, which is necessary in a static class that needs access to the UI.