I have an Android app that has an Application class and I have another class that extends PhoneStateListener.
I would like to use one of the objects from the Application class in my class that extends the PhoneStateListener. I wasn't able to do so because it the PhoneStateListener class doesn't extend Activity.
Is there any way I can use the object from the Application class within my PhoneStateListener class?
See this example and this Question
Extend PhoneStateListener and have a constructor that takes what it wants as argument.
Related
I'm a little bit confused with how GetView works. I currently have a page that needs to have at least 2 different controllers. From what I've seen, people mostly use GetView as opposed to Get.find() for better code format, however GetView seems to only use 1 controller, for example:
class HomeScreen extends GetView<HomeController>
I have tried to google it and haven't found any solution. I also have tried to use
class HomeScreen extends GetView<HomeController> with GetView<UserController>
But it gave me an error that says
The class 'GetView' can't be used as a mixin because it extends a class other than 'Object'.
I would very appreciate if you can give me a solution or a workaround to use GetView with two or more controllers.
Please note that I'm using GetX bindings (therefore I have already wrote Get.put(Controller()) in another file) and I want to avoid using Get.find in my widget tree.
Can you please explain what's the usecase of using GetView with multiple controllers? It's not supported. Because a view can have multiple controllers but how many?
Therefore, in that case, you should just use the GetX widget for different controllers like:
GetX<Controller1>(),
GetX<Controller2>(),
and so on
I was going through this since some of my UVC use this methodology:
https://www.doulos.com/knowhow/sysverilog/uvm/easier_uvm_guidelines/parameterized_interface/
But i want to extend the class in the interface and add/override some more functionality.
But when i tried to override the class, the compiler could not find the class, since it is scoped in the interface.
Any suggestions as to how I can override the class instead of re-implementing all the functions?
Thanks in advance.
That is one problem with using this methodology - you can only extend the class from within the interface. But that is no different from using a virtual interface — you cannot extend the interface.
The best thing you could do in put the extended class inside the interface. Use the factory to override the construction of the class.
Need your assistance. I created 2 custom ClassLoaders to load class files. But when I try to use .getClassLoader() on class I loaded, I saw ApplicationClassloader every time.
ClassLoader in Java works on three principle:
delegation,
visibility
uniqueness
Delegation principle forward request of class loading to parent class loader and only loads the class, if parent is not able to find or load class. Visibility principle allows child class loader to see all the classes loaded by parent ClassLoader, but parent class loader can not see classes loaded by child. Uniqueness principle allows to load a class exactly once, which is basically achieved by delegation and ensures that child ClassLoader doesn't reload the class already loaded by parent.
The class you are trying load should be there in your class path. Please check your application classpath
Read more: here
It means that your class is indeed defined by the application class loader, not your custom one. Your custom class loader is just initiating class loader that delegates to its parent (application class loader). Make sure the custom class loader defines the class itself.
MainActivity extends Application {
...
}
What is the use of writing extends Application?
Extends means that it inherits from Application, therefore having all of the Application properties, methods, and so forth, but extends it with your specific functionality. In other words, MainActivity adds more to the base Application.
I have an iPhone app that uses a Tab Bar Controller with 3 tabs. Each tab is a separate class. There are several methods that are identical in each class. Instead of having three copies of the same method, I'd like to share the method between the classes. However, I have not figured out how to do this.
Thanks.
This is a classical case of inheritance. Create a base class, and put all things that are common across the classes you are trying to build, into it, both functions and data members. Then, derive your three classes for your tabs from this class (inherit from it, or make it the parent class, lots of overlapping terms here that people generally throw around). Make sure your methods in the parent class are NOT defined as private methods. That would make them inaccessible to your child classes. Hope that helps!
Here you can make a new class and define that method inside that class which you want to share between more than one class.
Now whenever you want to access that method, just import the class and you can use the same method in multiple classes.
Let me know if you need more help.