All Questions
811
questions
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
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
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
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
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
56
votes
1
answer
5k
views
Java thread leaks when calling back from native thread via JNI
Summary: I am seeing Java thread leaks when calling back into Java from native code on a natively-created thread.
(Update 11 Feb 2014: We raised this as a support request with Oracle. It has now been ...
- 573
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
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
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
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
26
votes
1
answer
29k
views
Need to wait for asynchronous api callback before I return from method in Java
import java.util.concurrent.CountDownLatch;
import quickfix.Initiator;
public class UserSession {
private final CountDownLatch latch = new CountDownLatch(1);
public String await() {
...
- 2,377
24
votes
3
answers
9k
views
How to avoid memory leaks in callback?
Effective Java says:
A third common source of memory leaks
is listeners and other callbacks. If
you implement an API where clients
register callbacks but don’t
deregister them explicitly, ...
- 53.2k
22
votes
3
answers
7k
views
Java: How to call super method from inner in-place class
I have base class Foo with method spam and class Bar which overrides spam. I need to call spam of base class in method of some callback object which is defined in-place:
public class Foo {
public ...
- 1,670
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