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I am trying to write a simple notification application. All it does is notify a notication whenever the button is clicked.

I write my app step by step according to this tutorial.

I don't understand what channel id I should pass to the constructor in order that the app will work. Now the app doesn't do anything (it's not collapses either). I guess that the problem is in the initialization of the variable NotificationCompat.Builder notifyBuilder. I didn't know what to pass so I just passed an arbitary string "0".

My questions are what should I pass to the constructor of NotificationCompat.Builder and will it make the app to work?

Here's the MainActivity:

is there a way to create a reactive form basing on an existing data model with all the validation magic. In the example below author passes whole new object into a formbuilder but what I want to achieve is elegant way to tell formbuilder what field is required or needs some other validation.

https://malcoded.com/posts/angular-fundamentals-reactive-forms

Im studing the wso2am using his docker image. i'm following the api-manager-developer-fundamentals-tutorial

In one of the test labs i need to edit the web.xml file, but there is no editor (vi,vim,nano) inside the wso2am imagem.

When i use the command docker exec -it api-manager bash I going into the container but with the wso2 user. So i have no permition to use the apt-get and install an editor.

Someone knows how can i handle this? Really thank you

I am reading google doc and I found these lines, But I am unable to understand the difference between these two statements Why asynctask precessing is direct and loader processing indirect?

Reference

There are several ways to do background processing in Android. Two of those ways are:

1. You can do background processing directly, using the AsyncTask class.
2. You can do background processing indirectly, using the Loader framework and then the AsyncTaskLoader class.

How do you import toastr into an angular app?

I'm following the Angular Fundamentals course, and attempting to simply display toastr.success from within my export class:

I have been studying Content Providers by reading Android Developer Fundamentals (Version 1).

Under section "11.1 Share Data Through Content Providers" / "The query() method" there is a note that states

Note: The insert, delete, and update methods are provided for convenience and clarity. Technically, the query method could handle all requests, including those to insert, delete, and update data.

How can query method be used to insert / delete / and update data? The query method has the following signature and does not take in custom SQL strings.

I have been trying to add a dark mode to my app and have mainly been using this site (Tutorial) to learn how to implement it. Everything works other than the theme does not change until I restart the app. After some research I have found that recreate() would be the correct way to fix this issue, but I do not know where to implement it.

Currently my oncreate method in the main activity looks like:

I am studying this material for the WSO2 ESB certification:

https://wso2.com/training/enterprise-integrator-developer-fundamentals#request_training_enroll

Into the "Download Lab kit" section there is a tutorial about how to set an Inbound endpoint. Basically it simply ad an Inbound endpoint to this previous implemented tutorial project:

https://docs.wso2.com/display/EI611/Sending+a+Simple+Message+to+a+Service

I have done it and it works fine, basically in my project I have this REST API:

In nearly all languages that I've used (Python, C, C++, etc.), it's possible to write a "hello world" application with a text editor only and run it from command-line (interpreted languages) or compile/build it from command-line (compiled languages), e.g. cl.exe helloworld1.cpp.

On the other hand, every time I'm doing an Android App, I need to use Android Studio (which is slow on my machine), create a new project with the IDE, etc.

Question: What is the smallest number of minimalist Java source code files/project files to produce an .apk Android app? How to build it from command-line? (and never have to open the IDE)

NB: I've read many hello world for Android but all of them involve using the IDE.

NB2: I'm looking for standard apps written in Java, not solutions like Kivy, etc.

NB3: even if an IDE is probably more convenient to program an Android app, I don't see any technical reason for which compiling/building a number of files would absolutely require an IDE / programming with a GUI. Some people (like me) prefer command-line and text editor only, and such an IDE-free solution would be helpful.

NB4: I'm working on Windows platform, I have started a "Hello World without IDE" github repo here based on this answer, but I have a few problems such as this one. On the other hand, the method used there seems to be deprecated...