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votes
0answers
14 views

how do I mirror my google maps from phone to a small display on raspberry pi , {of course without GPS module}?

So, I am looking to make a very simple device that can work as a secondary screen for the maps app on my phone so that I can attach it to my bike and see the direction with having to use a cellphone ...
3
votes
2answers
165 views

Is recommendable set as final as classes by default in a SDK?

I am working on the development of an SDK in Android with Java, In general the user doesn't need to inherit any class of the SDK, so the question is if it is a good practice put by default all classes ...
1
vote
1answer
79 views

Is it good approach to create new viewModel class for every new Ui(Fragment/Activity)?

I am working on a project in which I am following clean Architecture from Google ... and for making code testable I am following an approach in which,I am creating a new ViewModel Class ViewModel ...
0
votes
1answer
131 views

Do shared ViewModels contradict MVVM?

I want to follow the MVVM app architecture. I also need to have some communication between some fragments. But the official approach is pretty confusing. Taken from the docs (https://developer....
0
votes
0answers
23 views

Sequence Diagram Assistance with external database

I have 5 Java/android classes which are in sequential order. The user inputs data into the text box and clicks next. Two things happen, 1 the data the user inputs is passed to the next activity and it ...
2
votes
3answers
497 views

Should business logic be in the app or in the backend?

I've recently started applying the Clean Architecture while developing an Android application. And so I divided my application in 4 different parts. Data layer Contains the implementation of ...
0
votes
0answers
160 views

Best practice for Asynchronous CRUD operations in Android/Java

A few months back, I was working on designing a client API (FooManager) for adding/removing/fetching a list of objects (Bar). The requirements were simple- 1. Fetch operation is CPU-intensive and ...
0
votes
1answer
52 views

Optimising network data usage in vehicle tracker

I'm currently working on an Android application that broadcasts the location of the device every 5 seconds. Pseudo showing current app process: deviceLocation = getLocation() if (hasChanged(...
0
votes
1answer
86 views

Can a user read static member values?

For my Android application, I wanted to store values such as username, userid and stuff in a sharedpreferences object. However, when I read more about it, rooted users can still have access to those ...
5
votes
4answers
607 views

Proper way to name a class which has just methods and not fields

GOAL: naming a class which has the responsibility to save data in Android database. The class structure is like this ClassName { public void saveSync(...){ /* implementation*/ } public ...
1
vote
1answer
42 views

Doing operations securily from an Android application into a Server

I have come up with a problem in my development and I have searched for correct solutions but have not found any. I am developing an application which lets users login with username and password. ...
2
votes
3answers
604 views

Can Java applications run on phones (at least android) AND Windows?

Hi all I love stackoverflow so helpful. Afaik IOS has some security measures that dont let other apps (such as jvm) execute code from your app. Not sure how much this is true. But anyway, I heard ...
0
votes
2answers
185 views

Is this Singleton-like design pattern a feasible framework to build on?

I am posting this question here after it having been determined to be "off-topic" for stackoverflow, and "too hypothetical" for codereview. I am experimenting with different singleton-style design ...
3
votes
1answer
494 views

Is Content Observer an implementation of Observer Pattern?

Observer Pattern is defined by the 'Gang of Four' Design Patterns book as a "one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated ...
1
vote
4answers
562 views

Put conditional logic inside method for DRY, or keep it outside for readability?

Take the following example which loads an interstitial ad every 10 times user does XYZ in the app, under certain conditions. It is called in multiple places in the code base: public class AdHandler { ...
1
vote
2answers
1k views

Clean Architecture: Apps that rely heavily on background services

I am trying to implement clean architecture (https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html) on an Android app. As an example, let's say that all the app does is monitors a ...
3
votes
1answer
388 views

Should I implement object pooling for Dalvik VMs?

This question extends from these questions: Should we avoid object creation in Java? Is object pooling a deprecated technique? Well, a JVM running on a server is well optimised, I know. Programs ...
-6
votes
2answers
240 views

Java Class has 50 inner class that are Getters [closed]

(JAVA) I have about 50 Getters, all return the same text, tag, type. Text and tag are String and type is int. The purpose is a forms that use repetitive fields along with form specific fields. I am ...
10
votes
3answers
4k views

Clean Architecture - Too many Use Case Classes

I'm going into Clean Architecture and lift my Android level from MVC to MVP, introducing DI with Dagger 2, Reactivity with RxJava 2, and of course Java 8. In MVP clean architecture there is a layer ...
3
votes
3answers
1k views

How useful is JNI in android?

In java/android we can call code written in the c/c++ language for execution speed advantage. I have heard of Ahead Of Time compilation which (as far as i know) compiles the entire application to ...
1
vote
1answer
1k views

MVP: Should a View have multiple Presenters?

Is it desirable (from an architectural standpoint) to have more than one Presenter communicating with a View? In my particular situation I have one presenter communicating with multiple views, and ...
11
votes
1answer
2k views

Why doesn't CharSequence define contains(CharSequence)?

This applies to to both Java SE & Android, as the contracts are identical. CharSequence documentation for Java SE CharSequence documentation for Android CharSequence does not define a contains(...
1
vote
0answers
40 views

Best Approach to maintain 2 instances of View Class with its own set of database/sharedPreferences

I have requirements for an Android application. The app already works for one client in V1. In V2 version of the app, we need the app to support 2 clients, for this we need to make changes in only 1 ...
0
votes
1answer
432 views

What is called the act of extending a Java class with another class?

When we create a Java class for example B that inherits from another class e.g. A, we say that our subclass (B) extends the super class (A). What is this act called in programming. Simply put, for ...
1
vote
2answers
2k views

Class with only one static method

I am using Java for creating an application for Android (so I can use many of Java 7 options, but cannot use all of them). I have two classes: class A{ static String getScript(String input){ ...
-1
votes
2answers
236 views

How to approach creating musical instrument sounds?

I've started to develop an application that allows the user to play notes on instruments. In particular, traditional Balinese instruments. As with many instruments, they have a certain amount of notes ...
1
vote
5answers
2k views

Switch case for one condition

I'm doing a code review at the moment on Java Android code. I am looking at a function where a programmer has decided to use a switch statement to wrap a single condition. I am considering making a ...
1
vote
2answers
283 views

Is this one method interface a good response to this interview question?

Today I received a rejection letter from a company where as part of the interview process they gave a a couple days to respond to the following question (paraphrased): Let’s say say you have ...
1
vote
0answers
65 views

How should I optimize my RecyclerAdapter (Android) to maximize efficiency of information retrieval in my app's data feed?

I was wondering if there were a set of standards or best practices for displaying information in lists for mobile applications (specifically Android applications that utilize RecyclerViews and custom ...
3
votes
1answer
346 views

Architecture recommendation for Android

Recently I developed an Android application which is very difficult to maintain. We are stuck in a complicated situation. We developed Android Apps which contained 500k LOC and another team developed ...
0
votes
2answers
1k views

Class instance while retaining variables between activities

First: This is for a project that is already deployed, and requires a solution that isn't "rewrite how the whole thing works"! I have a "record detail" screen of sorts that is storing the ...
2
votes
3answers
353 views

Java/Android CRUD SQL design

All the SQL in my app... Should I be confining it to its own special class? For example a MyDatabase class that extends SQLiteOpenHelper and implements all the create-tables, defines all the table ...
1
vote
1answer
129 views

What's the proper way to have one active callback at any time?

We have an Android app. The Android App uses Volley (https://developer.android.com/training/volley/index.html) to transmit network data. The point though is not about Volley, is about the pattern ...
0
votes
2answers
484 views

Store and access my objects using an int id

I have created a class HidDevice to form objects which concatenates input from each HIDDevice separately until a special key (ENTER) is pressed. So each instance of HidDevice have fields like int ...
2
votes
2answers
623 views

Is 20 Java classes for just making a REST call too much?

In an Android project, I am using dagger 2 for dependency injection, applying mvp design pattern, and I am writing interface for almost every class. Although it does achieved the separation of ...
0
votes
1answer
209 views

Android Studio, HTML and Java Correlation

I've recently started designing apps in Android Studio, and I've noticed that the same operations (for example, using a widget) can be completed by either going into the activityname_java file and ...
1
vote
1answer
360 views

Why are there no cross-platform mobile applications?

As a part of my master's thesis, I am carrying a research topic on why there are no cross platform mobile applications. As applications developed in Java can run on any operating system using the JVM,...
-2
votes
1answer
922 views

Duplicate code to avoid performance decrease due to function calls? [closed]

I have a simple list in Java that I need to search using one of two methods. The first method simply returns the position in the list of the first matching element. The second filters out any elements ...
6
votes
4answers
3k views

JSON API or Plain JSON

There is a debate in my company on whether we should use the JSON API specification or stick to plain JSON for developing APIs that will be consumed by mobile apps, mainly iOS and Android. One ...
-1
votes
1answer
812 views

What is the proper or recommended way to save String[]'s, Array's, ArrayList's and int[]'s to Android?

I've looked up this question many many times but keep seeing different answers, what is the BEST way to save array's? It seems ludicrously infantile that there is no standard or easy way to save ...
6
votes
0answers
195 views

Finger Paint path gets huge over time and slows the app

So I am writing a Finger paint app. I have multiple color which user can select. I save the path and paint information inside an array. ArrayList<PaintPath> arrayPaintPath = new ArrayList<...
2
votes
3answers
176 views

What is the least bad way of knowing the type of a key from Json file

in our app we have a Json file that contains several properties used for menu configuration. One of the keys should tell us if a menu item should be displayed. The thing is that the value for this key,...
-3
votes
3answers
3k views

What is the difference between extending a class and instantiating an object of that class? [closed]

I frequently see people extending a class like this for example: public class Bananas extends Fruits { public void eatFruit(){ } } rather than public class Bananas { Fruits ...
9
votes
1answer
4k views

In MVP pattern should the View instantiate a Model object based on UI contents, or just pass these contents as parameters to the Presenter?

I'm using MVP pattern in an android app that I'm developing. I have basically 4 elements: The AddUserView where a new user can be added: The AddUserPresenter The UserInfo (the pojo) The ...
-3
votes
1answer
174 views

How to save strings and integers permanently to a users device?

I'm building an app that requires the user to purchase content and sign to a User Agreement Contract. However, I'm not too sure where to start with in-app purchases and saving data types to the users ...
1
vote
0answers
791 views

Handling multiple rest api versions within Android Java client

Actual architecture I have an app where a model is attached to every activity. The model ask a repository for information that can come from server or local db depending on many factors. When it asks ...
2
votes
1answer
647 views

Is IntentService an implementation of Command Pattern?

According to Wikipedia: In object-oriented programming, the command pattern is a behavioral design pattern in which an object is used to encapsulate all information needed to perform an action or ...
2
votes
1answer
252 views

A way to update a list an Android application displays

I just started working on an Android app that should display posts from my site and then a three-column list of some products. The three columns on the list contain the product names, a short ...
3
votes
3answers
5k views

Why use XML in Android?

From what I understand, isn't XML used for layouts and to setup how an activity looks? My book says that XML files are converted into Java code but then, why not just write everything in Java?
3
votes
1answer
251 views

How are objects treated in an anonymous inner class?

Lets take this for example... entryText.addTextChangedListener(new TextWatcher() { TextView wordCount = (TextView) findViewById(R.id.wordCount); TextView charCount = (TextView) findViewById(...