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Android (Software)

Computer Programming (Professional Field)

AsyncTask

doInBackground

Status

onPreExecute

onPostExecute

downloadFile

программирование под android

разработка под android

разработка под андроид

java

eclipse

android sdk

андроид программирование

видео уроки

Андроид

программирование на java

android

как стать программистом

приложения для андроид

asynctask

00:00:14

Hello everyone This is lesson 90 we continue the series of

00:00:17

lessons he Task in this lesson we read the

00:00:20

statuses of the task we can always

00:00:22

determine in what state the

00:00:24

task is now, statuses are used for this There are

00:00:26

only three nng the task has not yet been

00:00:29

launched Running The task is in progress and the

00:00:31

Finish method onp execute has worked, that

00:00:34

is the task has been successfully completed, in principle,

00:00:37

everything is clear by the names, but let’s look and

00:00:39

see for ourselves; besides, it’s not very clear

00:00:41

What status the task will be if we

00:00:43

cancel it using the cancel method; let’s look at an

00:00:46

example; create a

00:00:48

project fil Strings

00:00:51

xml Activity Main xml using the hundred button;

00:00:55

launch the task using the status button We will

00:00:57

display its status in the

00:01:02

Main

00:01:10

Activity file by pressing the Start button. The

00:01:13

Start Task method is triggered. In it, we

00:01:15

simply create a new task, but for now we do

00:01:17

not launch it. By pressing the button, we

00:01:20

read and enter the status of the task on the screen.

00:01:23

We use the Get status method. The task itself is

00:01:25

simply run in a

00:01:28

pause loop. save everything and

00:01:32

run it, press start, the task has been created,

00:01:35

press the status status is pending That's right,

00:01:38

the task has not yet been

00:01:40

launched, let's rewrite the Start

00:01:51

Task method Now we will create the task and

00:01:53

run it, save it, run it, press

00:01:56

Start, the task has started working, press the status

00:01:59

while the status is running, Running Task in

00:02:02

work After the task has completed

00:02:04

end On the screen, click status status Finish

00:02:08

the task is completed successfully, the onp

00:02:10

execute method has been completed, now let's see

00:02:13

what the status will be if we cancel the task,

00:02:15

rewrite a hundred

00:02:18

Task without thinking twice, cancel the task immediately

00:02:21

after

00:02:23

launch, save, launch the application,

00:02:26

click Start, the task has been canceled, click status, the

00:02:30

status is somehow injured, as if the Task it’s

00:02:32

not particularly logical in operation, of course, but here’s a

00:02:35

feature of the implementation. Why

00:02:37

couldn’t you enter another

00:02:39

cancel status? I don’t know Android developers know

00:02:41

better how to distinguish whether a task is

00:02:43

started or canceled, you can use the

00:02:46

is cancel method, we’ll rewrite the Show status

00:02:49

like

00:02:51

this, we’ll save it, we’ll launch the application zhm

00:02:54

task is canceled zhm status task

00:02:57

cancelled, the cheat returned True and we displayed the

00:03:01

corresponding

00:03:04

message, that's all. And in the next

00:03:06

lesson, we save the sing Task connection when

00:03:09

rotating the screen. Bye everyone

Description:

Мы всегда можем определить, в каком состоянии сейчас находится задача. Для этого используются статусы. Android development tutorial (online courses). In this tutorial: read the status of the task Обсуждение урока на форуме: http://forum.startandroid.ru/viewtopic.php?t=979 Ссылка на источник: https://startandroid.ru/ru/uroki/vse-uroki-spiskom/153-urok-90-asynctask-status-statusy-zadachi.html

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