All Questions
56
questions
0
votes
0
answers
48
views
Is it possible to compare two seperate instances of objects that are considered callbacks using the equals() method?
I have two seperate objects that are from the same class, and using them as callbacks.
I would like to compare them at runtime in my app, because I'm relying on the equals method in some collection to ...
- 323
0
votes
0
answers
79
views
Inner class seems unnecessary in the example given in On Java 8 by Bruce Eckel
Bruce Eckel gives the following example in Chapter Inner Classed of the book On Java 8 to demonstrate the necessity of using an inner class instead of implementing an interface. But I found the code ...
- 1
0
votes
2
answers
554
views
java callback function in case of an exception
I've to implement a callback mechanism in case of an exception.
suppose i hv a code to call like , which takes 3 parameters
inside a class called ServiceA
serviceA.functionA(String str1, String str2, ...
- 195
0
votes
0
answers
124
views
Why can't Java see the interface method?
I need to connect two Functions and a Consumer.
To do this, I created a new interface FunctionToConsumer in which I implemented the atLast method.
But the atLast method is just not visible.
error: ...
- 355
0
votes
0
answers
97
views
How to make callback from one Class to Adapter in Android
When the center is activated, then there should be a call back to the Adapter class, which updates the list and make changes.
Code for the Activation of the centre:
public class ActivatePresenter ...
1
vote
1
answer
640
views
Java - Interface - How do I assign a specific interface in multiple activities all together
I have a service which has an interface, I'm implementing the interface callback in multiple activities, but because of I'm calling the app instance on every activity's onCreate, the interfaces are ...
user11969024
0
votes
3
answers
33
views
Return value of interface method (no params) is acquired asynchronously. Can it be implemented?
I've been given an interface which is like this:
MyInterface {
List<FirebaseVisionFace> getFaceList();
}
I have to implement it in a class (let's call it MyFirebaseFaceClass) in such a way ...
- 373
0
votes
2
answers
214
views
Java/Kotlin callback syntax - do I really need 2 callback definitions after conversion to Kotlin?
I have a problem that has been challenging me for a few days with no resolution (more directly, no resolution I feel is correct). The issue is around callbacks, Java implementation vs Kotlin ...
- 1,757
0
votes
1
answer
256
views
Multiple interface implementations Android [duplicate]
I have an Activity which implements two interfaces for call backs on certain actions. I want to send a context of my Activity to another Class which will access the object of the specified callback.
...
- 1,681
0
votes
3
answers
533
views
Listen to (register to) a specific method of interface without implement all the methods, Java
Interfaces are a good way to simulate callbacks. However, the class that implements an interface must override all the methods of this interface.
Now, I have an interface
interface MyInterface {
...
- 538
1
vote
1
answer
371
views
Py4J Callback Interface throws "Invalid interface name" when the packaged .jar is used as a plugin
My code is exactly the same as the example shown on py4j website:
Implementing Java Interfaces from Python
Except my classes are all in the same src.main.java package
(see below for the code)
...
- 45
0
votes
1
answer
19
views
Handling multiple listeners with a kind of identification
I develop a Android application for a Ble-Device and implement a Interface to listen on write, read and subscribe operations. I add all my listener instances to a List and trigger the Interface ...
- 373
0
votes
1
answer
1k
views
MainActivity can't cast interface
In MainActivity I have interface
public interface MyListener{
void myMethod(boolean done);
}
but when I trying cast in onCreate
myListener = (MyListener) this;
I got java.lang....
- 371
1
vote
1
answer
24
views
Same code for all callback implementations in Java
I have a callback interface:
public interface OnServerDoneListener {
void onDone(int code, byte[] body);
void onFailure();
}
It's used as a listener for HTTP requests in many places across ...
- 2,072
1
vote
3
answers
1k
views
Unable to update textview from callback method
I have an interface implemented in MainActivity, and inside that callback method i want to update my TextView but i am getting nullpointer exception.
This is my MainActivity class
public class ...
- 338