Android terminates the infinite loop thread and destroys the thread when the program exits.

Source: Internet
Author: User
Tags terminates thread stop

Android starts a subthread, which is an endless loop and cannot print "Hello ".

Now, how can I click a Button to terminate the subthread?

Stop () does not work. If destroy () has an exception, Handler does not seem to be able to solve it because it is a thread...


The answer is as follows:

Thread is like this: Thread {boolean flag = fase; run () {while (! Flag) {}} Thread t = new Thread (); t. start (); ------------------------------------------------------- to terminate the loop, you only need to t. flag = true; ========================================================== another method of thread is as follows: thread {run () {while (true) {Thread. sleep (xxxx) ;}} Thread t = new Thread (); t. start (); ------------------------------------------ to terminate the loop, you only need to t. interrupte (); but pay attention to the call time here. It should be called within xxxx time after the sub-thread executes the sleep (xxxx) in the run method. That is, the sub-thread will sleep for a while, wake up for a while, and wake up for a while. It will be called when the sub-thread falls asleep.


The thread stops after the Android program exits.

Tested: the following method can terminate a thread.

Method 1: System. exit (0 );

Method 2: android. OS. Process. killProcess (android. OS. Process. myPid () // slightly delayed when disabled



A question about thread stop after Android program exits 10

In Android programs, the UI thread is the main thread.

Theoretically, after the Activity calls the finish method, the main thread is terminated.

Then the sub-thread on it should also be stopped


However, the test shows that this is not the case.

After the program exits, the sub-thread is still running in the background.

The thread must be stopped with DDMS.


So how do I stop all enabled Sub-threads when the program exits?

I thought of two solutions:


1. Change the identifier of the loop in the thread upon exit

While (isRun ){...}

Setting isRun to false breaks the loop and ends the thread.


2. Do not use a loop like while (isRun) {...}

The Handler mechanism provided by Android is used to complete

Java code

// Add a thread to the thread queue immediately and execute its [color = red] run [/color] Method
Handler. post (test );
Runnable test = new Runnable (){
Public void run (){
// The above code is omitted
// The latency is 1000 milliseconds. run the [color = red] run [/color] method of this thread.
Handler. postDelayed (test, 1000 );
// Exit
// Remove the thread from the thread queue and it will not be executed
Handler. removeCallbacks (test );


For example, the red-letter mark is indeed the run method called, so a sub-thread is not actually started.





Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.