All Questions
71
questions
192
votes
12
answers
170k
views
Java executors: how to be notified, without blocking, when a task completes?
Say I have a queue full of tasks which I need to submit to an executor service. I want them processed one at a time. The simplest way I can think of is to:
Take a task from the queue
Submit it to ...
- 10.5k
210
votes
18
answers
325k
views
Callback functions in Java
Is there a way to pass a call back function in a Java method?
The behavior I'm trying to mimic is a .Net Delegate being passed to a function.
I've seen people suggesting creating a separate object ...
- 55.3k
77
votes
5
answers
226k
views
How do I perform a JAVA callback between classes? [duplicate]
I am coming from JavaScript, in which callbacks are pretty easy. I am trying to implement them into JAVA, without success.
I have a Parent class:
import java.net.Socket;
import java.util.concurrent....
- 1,353
256
votes
9
answers
141k
views
How to remove all callbacks from a Handler?
I have a Handler from my sub-Activity that was called by the main Activity. This Handler is used by sub-classes to postDelay some Runnables, and I can't manage them. Now, in the onStop event, I need ...
- 19.8k
62
votes
6
answers
76k
views
What is a callback method in Java? (Term seems to be used loosely)
I don't understand what a callback method is and I have heard people use that term very loosely. In the Java world, what is a callback method? If someone could provide some example code of a Java ...
- 8,258
60
votes
9
answers
46k
views
method called after release() exception unable to resume with android camera
While developing a camera app I've encountered an exception that only happened when I switch to other app (onPause() for my app).
01-15 17:22:15.017: E/AndroidRuntime(14336): FATAL EXCEPTION: main
01-...
- 8,862
38
votes
4
answers
53k
views
Automatically log Android lifecycle events using ActivityLifecycleCallbacks?
I am trying to automatically capture and log Android lifecycle events using ActivityLifecycleCallbacks, however documentation on this matter is scarce, to say the least:
public void ...
- 3,677
40
votes
1
answer
37k
views
JNI - How to callback from C++ or C to Java?
I have Java application that invokes native C++/C code. The C++/C code needs to callback into Java. Could you give me some examples how to do this.
- 421
12
votes
1
answer
15k
views
Callback from Adapter
So I have a custom listview. It's like Instagram layout with 1 image and bunch of buttons in each list items. So here's the problem:
I want to implement the share button. To do this, I tried to ...
- 151
9
votes
3
answers
18k
views
How to create a proper Volley Listener for cross class Volley method calling
I aim to call Volley from another class in, a very succinct, modular way ie:
VolleyListener newListener = new VolleyListener();
VolleySingleton.getsInstance()....
- 6,549
18
votes
2
answers
25k
views
Implement callback function in JNI using Interface
I need to implement callback function in Java using “interface”. I have wrote the application part as MyJavaFunction(int size, m_GetSizeInterface);
m_GetSizeInterface is an Interface which contains ...
- 6,667
14
votes
5
answers
20k
views
Java set a callback from ExecutorService
I have a fixedThreadPool that I am using to run a bunch of worker threads to achieve parallel execution of a task with many components.
When all threads have finished, I retrieve their results (which ...
- 18.5k
45
votes
4
answers
9k
views
Java pattern for nested callbacks?
I'm looking for a Java pattern for making a nested sequence of non-blocking method calls. In my case, some client code needs to asynchronously invoke a service to perform some use case, and each step ...
- 13.6k
22
votes
4
answers
25k
views
SOAP web service callback architecture?
I am quite new to web services, JAX-WS etc. so maybe noob question...
So, I want to implement a web service to make two systems communicate. The "client" system is interested in events that are ...
- 17.2k
36
votes
1
answer
16k
views
Using Mockito, how do I intercept a callback object on a void method?
I'm using mockito to test a legacy JAAS/LDAP login module.
The javax.security.auth.callback.CallbackHandler interface defines the function:
void handle(javax.security.auth.callback.Callback[] ...
- 77.9k