todo-mvp | Todo Lite app following MVP Architecture in Java | Architecture library

 by   waleedsarwar86 Java Version: Current License: No License

kandi X-RAY | todo-mvp Summary

kandi X-RAY | todo-mvp Summary

todo-mvp is a Java library typically used in Architecture, Firebase applications. todo-mvp has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

Todo Lite app following MVP Architecture in Java

            kandi-support Support

              todo-mvp has a low active ecosystem.
              It has 7 star(s) with 2 fork(s). There are 1 watchers for this library.
              It had no major release in the last 6 months.
              There are 1 open issues and 0 have been closed. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of todo-mvp is current.

            kandi-Quality Quality

              todo-mvp has no bugs reported.

            kandi-Security Security

              todo-mvp has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              todo-mvp does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              todo-mvp releases are not available. You will need to build from source code and install.
              Build file is available. You can build the component from source.
              Installation instructions, examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed todo-mvp and discovered the below as its top functions. This is intended to give you an instant insight into todo-mvp implemented functionality, and help decide if they suit your requirements.
            • Gets the data snapshot for the specified query .
            • Gets the tasks .
            • Schedules a task reminder .
            • Creates a notification for a task .
            • Logs to the user .
            • Initialize the task model .
            • Called when a child view is pressed .
            • Load priority string .
            • Initializes the recyclerView .
            • Enables or disables or disable register button .
            Get all kandi verified functions for this library.

            todo-mvp Key Features

            No Key Features are available at this moment for todo-mvp.

            todo-mvp Examples and Code Snippets

            No Code Snippets are available at this moment for todo-mvp.

            Community Discussions


            RecyclerView Items doesn't appear until i scroll it
            Asked 2019-Aug-27 at 13:15

            I'm using Recyclerview inside a Fragment Following Google's sample of MVP Android architecture and I tried to make the View part passive as possible following this article , which makes the whole Recyclerview Adapter passive of the Data Models and the presenter handles it.

            Here is my code of the Fragment:



            Answered 2017-Oct-09 at 19:15

            I noticed in your item xml your constraintLayout height is match_parent right? I recommend you to use it as wrap_content



            Can I register MVP Presenter inside Fragment
            Asked 2019-Jul-22 at 02:05

            I've been following MVP design pattern provided by Google to refactor my application. I have one MainActivity and many Fragments and it seems little be messy for me to create an activity for every fragment, so I've been thinking to register presenter in fragment. What I'm seeing is that every fragment register its own presenter, but I'm not sure how much wrong it is... :)

            So here is my Presenter:



            Answered 2017-Mar-15 at 21:32

            As you can see in Google's samples (, Activities create Presenters. Also Views attach to Activity and Presenters get views (Fragments) as parameter.

            After Fragment transaction committed or Fragment (view) state restored Presenters get created and take Fragments (views) as parameter than call



            Is Content Provider an implementation of Repository Pattern?
            Asked 2019-Jul-12 at 22:44

            Repository Pattern is defined by Hieatt and Rob Mee as design pattern that mediates between the domain and data mapping layers using a collection-like interface for accessing domain objects.

            Basically it abstracts one or more I/O devices (cloud, disk, data base, etc) into a common collection-like interface where you can read, write, seek and delete data.

            On Fernando Cejas's Android Clean Architecture, all data needed for the application comes from this layer through a repository implementation (the interface is in the domain layer) that uses a Repository Pattern with a strategy that, through a factory, picks different data sources depending on certain conditions.

            However, as pointed out by professor Douglas Schmidt at Coursera course, content provider manages and mediates access to a central repository of data to one or more applications

            In the book Programming Android, content providers are used as a Facade for a RESTful Web Service. This approach was initially presented by Virgil Dobjanschi during Google I/O 2010.

            Thus, instead of using content providers to access the local SQLite database, why not using it as the repository pattern itself?



            Answered 2017-Apr-06 at 15:18

            That is an interesting question. I think my first answer will be no, Content Provider is not an implementation of the Repository Pattern.

            As you mentioned, the Repository Pattern is meant to separate the business logic (domain) from the data layer. This approach allows you to create unit tests for your business logic (so domain should not depend on Android at all). By using a Content Provider you will need to have some sort of Android objects in your domain.

            You could imagine a way to hide the Content Provider logic behind an Interface, but you will loose many of the nice stuff a Content Provider allows you to do.

            If you are interested in Android Architecture I would recommend you to have a look at this Github project Android Clean Architecture. You will find a nice way to separate your presentation, domain and data layer, and the communication between the domain and data is done by using a Repository Pattern.

            Hope this will help!



            Android TabLayout Fragment with MVP
            Asked 2019-Apr-27 at 12:31

            I'm implementing an MVP app in which the Views are fragments loaded in Activities. Each Activity had 1 fragment to display. I have to change my implementation and add the TabLayout which will now display the fragments. I've tried different ways of passing the fragment to the adapter but all makes my app crash and I can't understand the error. My last try, I'm passing an arraylist of fragments(1 for now) to the adapter. At the base, I'm following google samples MVP todo app, but I need to implement this tab layout. Please, this is for my major project, I looked everywhere and this is my last resort.



            Answered 2018-May-03 at 00:56
            1. For what you want to achieve, you won't be using the FragmentLoader Class. Remove it (just for the tabs Activities). And the getSupportFragmentManager line.

            2. In Home Activity, how you set up the tabLayout and Viewpager, it's fine. Remove addFragment line. Add the following after setAdapter:


            3. In the tabPagerAdapter, just create the object presenter and fragment there. In the getItem method, case 0, you can have:

              HomeFragment homeFragment = HomeFragment.newInstance(); homePresenter = new HomePresenter(repo, homeFragment); return homeFragment;

            4. Oh and in the TabPagerAdapter, you can pass your repo argument there for creating your presenter.

            I hope I was clear. Let me know if you have any issues.



            In clean MVP, who should handle combining interactors?
            Asked 2019-Apr-12 at 16:21

            I've seen good examples of MVP architecture (here and here). Both present only simple interactors, but I wonder how to deal with more complex use case, consisting of steps, which are repeated in other use cases.

            For example, my API requires token to authenticate any call. I've created an interactor to get that token (GetToken). I want to get user's last login date (GetLastLoginDate) and then fetch a list of changes that occured between that date and now (GetVersionChanges).

            Where those interactor should be chained? I want to keep them separate, because some of them are reused in other parts of the code. I've came up with two solutions.

            1. Presenter should chain all interactors. This solution works as long the use case is not complex and doesn't have many preconditions. It seems to me it's not the right place, because it burdens presenter with another responsibility.

            2. Interactor can use many repositories (no clean architecture rules are broken then). Why not use TokenRepository in other interactors? Because getting token is much more complex than just reaching to repository. Repeating the steps in other interactor does not reuse already existing code.

            Both solutions have their flaws and are against basic principles (DRY, single responsibility principle).



            Answered 2019-Apr-12 at 16:21

            If I were you I would just put the logic of getting a token in a separate interactor (maybe named getTokenInteractor) and call that interactor from your others interactor who may need it. That way, it would be in an interactor that you chose either to use a token (and call or not your getTokenInteractor) and also in an interactor that you retrieve it and deal with errors. I would do the same for your "getVersionChanges" use case and let an interactor chain the calls.

            Let's imagine you have a presenter who needs to display the version changes. He will call a first interactor (GetVersionChangesInteractor) who will first check if he has a token (by calling getTokenInteractor), then call GetLastLoginDateRepository for retrieving the date, and call GetVersionChangesRepository with that date and finally give the result to your presenter.

            That way, your business logic can stay 100% in your interactor and your presenter can focus on how he will display that on screen.

            By the way, if your API needs a token for every call you should move it in an Interceptor so you do not have to deal with it at every call.



            Room database error
            Asked 2018-Sep-15 at 19:44

            this my Code



            Answered 2018-Sep-15 at 19:44

            Remove final from your class



            Room Retrofit Dagger2 MVP: Error: cannot find symbol variable DaggerAppComponent
            Asked 2018-Jul-07 at 06:54

            I am trying to build an app that is based on [todo-mvp-dagger] and retrofit. After creating the initial classes, modules, room db (first time using) and rebuilding the project, I am receiving an error: cannot find symbol variable DaggerAppComponent

            Following todo-mvp-dagger app from Google Android Architecture sample.
            The [todo-mvp-dagger] app is building fine but mine is not.
            What am I missing?

            Here is my project repository.

            Code is minimized now

            I updated the Dagger version and now I am getting following errors

            1. error: cannot find symbol variable DaggerAppComponent
            2. /Users/abhinavtyagi/Documents/workspace/workspace_android/Research/UdacityCourseViewer/app/build/generated/source/apt/debug/com/tyagiabhinav/udacitycourseviewer/di/ uses unchecked or unsafe operations. Recompile with -Xlint:unchecked for details.

            /Users/abhinavtyagi/Documents/workspace/workspace_android/Research/UdacityCourseViewer/app/build/generated/source/apt/debug/com/tyagiabhinav/udacitycourseviewer/di/ uses unchecked or unsafe operations. Recompile with -Xlint:unchecked for details.



            Answered 2018-Jul-07 at 06:54

            replace DaggerAppComponent with DaggerApplicationComponent since your component name is ApplicationComponent not AppComponent



            Android - NPE when using FragmentPagerAdapter and rotating device
            Asked 2018-May-25 at 23:00

            I am trying to implement an MVP architecture by following Google's sample todo app

            The problem I have is that I am getting a NPE when starting my presenter in the onResume() of the fragments. This happens when I change the orientation of the device.

            I have a FragmentPagerAdapter with two static fragments.

            From what I understand the FragmentPagerAdapter is meant to retain the fragments when the screen is rotated which implies the fragments would retain their presenters. However the presenters are null in onResume() so there is something I am not understanding.

            Any help/comments are appreciated.


            Here is my current FragmentPagerAdapter



            Answered 2018-May-12 at 21:17

            To be honest, fragments in Android are such a hassle, I get frustrated by them to this day after quite a few years of Android development. I use something like this, will be useful in this case:



            Where should I put the image download logic on Android, according to the MVP pattern?
            Asked 2018-Apr-11 at 14:41

            I'm writing an Android application and although I already have read about MVP and saw some examples in Android, I'm in doubt about how should I structure this part of the app.

            NOTE: My app follows a structure very similar to:

            In this app, the Model should fetch JSON data from a web service. This data, among other stuff, contains links of images that the app should download asynchronously. And, after downloading, these images should be presented to the user.

            How should I approach this?

            Right now, my idea is to add the web service request logic on the Model (I'm also using the Repository pattern) and the download logic on the Presenter. Something like this (the code is just an example):



            Answered 2018-Apr-11 at 02:37

            You can have a Presenter without the need of having a view explicitly linked to that Presenter. In other words, you can have a presenter only to encapsulate some logical. In your case, you can have a presenter that only knows how to fetch and provide some images. And your view can make use of this specific presenter.

            I did not get why would you have to pass the context to the model.

            Right now, my idea is to add the web service request logic on the Model (I'm also using the Repository pattern) and the download logic on the Presenter. Something like this (the code is just an example):

            You could do that. However, it seems more like MVVM where you put logical into Model and the Model knows how to fetch data.

            In your case, you want to follow MVP, so the model only holds data (pieces of information/data). So, you can have one Presenter that knows how to download your images. And you can have some Utils that could help you with the request part. You can have another model for that Presenter that download images for saving your images, like a cache. And, again if you want to make some sort of cache logic, you should do on the same presenter that knows how to download an image. Or, if it becoming too big and complex, you can make a Presenter that only knows hot to cache stuff.

            Once your Presenter only knows how to download an image, or only knows how to save an image. You can test it easy, just pass a link to your Presenter method and check if it could handle download the image.

            Note: I did not understand how could be convenient or important you pass context for your model unless it knows some sort of cache using Android preferences?

            NOTE 2: I would love if I could unit test this part of the app (Mocking the DownloadManager). So, passing the Context to the Model is not an option, as it breaks the MVP (IMHO) and would be much harder to unit test it.



            Is using a Singleton pattern good for large Generic classes in Java?
            Asked 2018-Apr-04 at 19:55

            I'm new to Generics and the Singleton pattern in Java. I have the following questions:

            • Is a Generic class compatible with the Singleton Pattern, namely having a static instance?

            • If so, I have the following Generic class that I want to convert to a Singleton. What is the best practice?

            • (Beginner question) Is there a good way to de-generify an instance of the class in runtime? passing the class as parameter in getInstance()?



            Answered 2017-Dec-29 at 12:23
            1. Since the singleton pattern tries to guarantee only one living instance of a given class at any time, it's not very compatible with the idea of a versatile class that can accept or produce different results depending on its current generic type. For generics to be any useful, you need to be able to create different flavors of the same type (usual exemple: a List of String and a List of Integer)
            2. N/A
            3. If you are passing a parameter to the getInstance of a singleton, then you are not really wanting a singleton but a factory. A singleton can only be non parameterized, or else the first call freezes the context.

            Do not abuse of singleton. They are the first pattern you may try to implement, because it's the first in every book, but it's almost always at least useless, at most a performance bottleneck and a bad design decision (not very OO)


            you assumption that each new instance couldn't share the same cache is basically wrong, for two reasons:

            1. not using a Singleton does not forces you to use several instances of the same type. It just allows you to do so, as well as enabling inheritance (which the singleton simply cann't). If you use Spring and a singleton-scoped bean (the default), then your repository exists only once in memory - even if it does not implement the singleton pattern as described in the books - and is shared between all consummers (thus only one cache). This can be accomplished without spring too, just use some kind of factory or registry.
            2. caching with an hashmap in your class is a bit fishy, too. Caching is an implementation detail and you should not try to implement it in this way (you will end up eating the whole memory quite easily, at least, use WeakHashMap instead - or the Guava version, using CacheBuilder). You could also declare your cache as static so it will only exist once in memory. Modern applications treat caching as an aspect, like transactions for example. It should not leak to your code. For example, look at ehcache, redis, terracotta, etc. they all implement the JSR-107 and are configured directly on your method prototype, with some annotation (@Cacheable, etc.). Ho and caching usually goes to the service layer - you do not cache the state of the db, you cache the responses sent to the users after processing of the business logic (even if this rule is not absolutely strict)

            The singleton also has a very big problem: it is directly responsible to instantiate the object, that is, direct use of the new keyword. This is a pain, as you can not change the concret type of the implementation at runtime (for testing purpose, or any other use). Look at the factory/factory method pattern to see a better way to change the type at runtime.

            What you can do is having an abstract base class, generified, that your concret dao will extend (but those will not be generic). Something like this:


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install todo-mvp

            Clone or download this repo.
            This app runs off a Firebase backend. You will need to generate your firebase backend. To do this, navigate to and sign up. Create a project called "Todo Lite" (or what ever you want to call it).
            Generate your own google-services.json file to use with the app. Navigate to the Firebase project settings dashboard. You should see an option to download the google-services.json file. This must then be placed into the app folder of this project.
            Create an account on Fabric for Crashlytics. To do this, navigate to and Signup and get fabric_api_key
            Rename the to gradle.poperties and put the values accordingly and you are good to go.


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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