android - Handlers initialized with Looper.getMainLooper() does not respond to message callbacks -

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I am trying to implement the hearing on the same loop with different threads.

Below I have two headlars, one is built in the main thread, the other is in the thread, though both have been initialized to listen on the main loop. 

  Private handler mMain; Public Static Final Threadpool Excl. Tape = (Threadpool Exchanger) Exporter. Newcastle Threadpool (); Override public null on @reate (bundle saved instainstate) {super.naught (savedinstenstate); SetContentView (R.layout.activity_main); MMain = new handler (Looper.getMainLooper ()) {@Override public void handleMessage (message msg) {log. Wtf ("", "main:" + msg); }}; Tpe.execute {New handhelder tChild = new handler (Looper.getMainLooper ()) {@Override Public void handleMessage (Message msg) {Log. Wtf ("", "child:" + msg);}} ; @ Override Public Wide Run () {Log. Wtf ("," Send msg to Main Lauper); tChild.sendEmptyMessage (100);}}); }   
 But when I send a message below, only the child handler prints the message. The main handler does not receive the message. 03-20 22: 02: 26.754: A / (12857): Send a message to the main loop 03-20 22: 02: 26.847: A / (12857): Children: {what = 100 when = -8ms}   
 What am I doing wrong? Thanks for reading.   
 
 
 controls every  handler  example  message  There is no way to target and share them, so every message or post is sent to  handler  which is executed by that example.  
  Luper  indicates that  which thread  will send messages / runnabels sent out. In your code, both threaders will execute  handleMessage ()  on the main thread, even though they are created on separate threads. This is the real reason that you can send a  luper  example to  handler  if you do not pass any  Looper , then < Strong> then   handler  will execute the code on the thread in which it was created (which should also be  should  also be a  Looper  thread).  
 Besides, for this reason there is no reason to create many handlers to post data in such a way. A single  handler  is designed to send messages from multiple threads, and they are all sorted in  MessageQueue  and executed on selected  Looper  threads Are there. You can post it directly from the background thread on  mMain  to execute the code on that thread. In this case, going under the  Looper , the code is redundant on the main thread already.

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