repeat

I want for an event to fire every hour (at 5:00, 6:00, 7:00, etc...). I tried with a persistent background service with a thread but it wasn't the right solution because of: battery consumption service termination, due to android memory management So I'm trying with AlarmManager. It works if I set an alarm to fire in X seconds (using "set" method). But how can I repeat an event (using "setRepeating" method) at the top of every hour, until the alarm is canceled? Thanks! When you set alarms you have two times: First trigger time, and the next trigger interval. You then have to calculate the

I have a Python list and I want to know what's the quickest way to count the number of occurrences of the item, '1' in this list. In my actual case, the item can occur tens of thousands of times which is why I want a fast way. ['1', '1', '1', '1', '1', '1', '2', '2', '2', '2', '7', '7', '7', '10', '10'] Does the collections module help? I'm using Python 2.7 a = ['1', '1', '1', '1', '1', '1', '2', '2', '2', '2', '7', '7', '7', '10', '10'] print a.count("1") It's probably optimized heavily at the C level. Edit: I randomly generated a large list. In [8]: len(a) Out[8]: 6339347 In [9]: %timeit a

I need to build a background task that runs every 10/15 minutes (doesn't really matter, either is good), even when the application is not running. How can I accomplish this? I can't seem the wrap my head around this. I read I could use some sort of runnable() functionality or use a background services or AlarmManager. I was thinking of a background service, since it also must be done when the application itself is not running. What is a better way of doing this and how could I do it? You have have detemined the amount of time (interval) to execute a snippet of code, its better to use

I need some help in converting a 2X2 matrix to a 4X4 matrix in the following manner: A = [2 6; 8 4] should become: B = [2 2 6 6; 2 2 6 6; 8 8 4 4; 8 8 4 4] How would I do this? A = [2 6; 8 4]; % arbitrary 2x2 input matrix B = repmat(A,2,2); % replicates rows & columns but not in the way you want B = B([1 3 2 4], :); % swaps rows 2 and 3 B = B(:, [1 3 2 4]); % swaps columns 2 and 3, and you're done! In newer versions of MATLAB (R2015a and later) the easiest way to do this is using the repelem function: B = repelem(A, 2, 2); For older versions, a short alternative to the other (largely) indexing

First of all, I could not even chose the method to use, i'm reading for hours now and someone says use 'Handlers', someone says use 'Timer'. Here's what I try to achieve: At preferences, theres a setting(checkbox) which to enable / disable the repeating job. As that checkbox is checked, the timer should start to work and the thread should be executed every x seconds. As checkbox is unchecked, timer should stop. Here's my code: Checking whether if checkbox is checked or not, if checked 'refreshAllServers' void will be executed which does the job with timer. boolean CheckboxPreference = prefs

is there a way to set the number of times a background image repeats with css? An ugly hack could be inserting multiple times —statically— the same image (using multiple backgrounds ): E.g. To repeat horizontally an image (80x80) three times: background-image: url('bg_texture.png'), url('bg_texture.png'), url('bg_texture.png'); background-repeat: no-repeat, no-repeat, no-repeat; background-position: 0 top, 80px top, 160px top; Beware: not working on IE under 9 version ( source ). no. you might set a absolute width for a box but there is no css option to repeat the image n times. You can