In Activity creates a handler, but the handler to take the thread ID is not obtained when the Activity ID number, ask why.

code is as follows:

 

public class MainActivity extends Activity implements Runnable {


Handler handler = new Handler () {
public void handleMessage (Message msg) {
Sp (Thread.currentThread (). GetId () + "------------- Handler");
} 

};

@ Override 

public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
Sp (Thread.currentThread (). GetId () + "------------- MainActivity");

new Thread (this). start ();
} 


@ Override 

public void run () {


Sp (Thread.currentThread (). GetId () + "------------- New Thread");
try {
Thread.sleep (3000);
} Catch (InterruptedException e) {
e.printStackTrace ();
} 

handler.handleMessage (handler.obtainMessage ());
} 

} 

------ Solution ------------------------------------ --------------------


not looking not seen it yet :-)

You missed handler.handleMessage (handler.obtainMessage ());
changed handler.sendMessage (handler.obtainMessage ());


otherwise equivalent subroutine call.


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top.
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main thread has its own message queue, the general thread is created without its own message queue, the message processing is done in the main thread, if thread using Looper.prepare () and Looper.loop () creates a message queue can allow message processing in this thread.

 



public class MainActivity extends Activity implements Runnable {

Handler handler = new Handler () {
public void handleMessage (Message msg) {
Sp (Thread.currentThread (). GetId () + "---- --------- Handler "); / / This is the main thread ID 

} 

};

@ Override 

public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
Sp (Thread.currentThread (). GetId () + "------------- MainActivity"); ;/ / This is the main thread ID 


new Thread (this). start ();
} 


@ Override 

public void run () {

Sp (Thread.currentThread (). GetId () + "------------- New Thread"); ; / / This is the new thread ID 

try {
Thread.sleep (3000);
} Catch (InterruptedException e) {
e.printStackTrace ();
} 

handler.handleMessage (handler.obtainMessage ());
} 

} 





 
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 Thank you for your answer.



 I run this program, the result is this:


 

08-28 02:51:13.838: INFO / System.out (437): 1 ------------- MainActivity 

08-28 02:51:14.248: INFO / System.out (437): 8 ------------- New Thread 

08-28 02:51:17.317: INFO / System.out (437): 8 ------------- Handler 





 I do not know why, and the child thread handler get the same ID, please enlighten. 
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 Thank you, solved. 
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 access points :-)

 
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 Thank you to share it with those photos 
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 incisive, fontlose Daniel