Today, All mobile application contains more than one screens to provide all necessary feature to the end users. Like user can move from splash screen to home screen.
From this home screen, the user can perform other tasks that show a result in other screens. These screens will usually take the form of activity and fragment within the app. An end user can navigate on all other screens with the help of screen gestures, button clicks, and menu selections. All of the work involved in navigation between destinations and stack that is handled by a navigation controller. Without navigation, we have to write a very big manual code to move from one screen to another screen that creates complex navigation paths.
To get dynamic data in a mobile application. We need to connect with a server to get and post some data. To achieve it, we always use HTTP to perform curl requests and create a connection between applications and server at a certain period to send or receive the data request from an application to the server.
Flutter providing us http to connect a mobile application with a server to perform GET, POST and other requests. POST and GET are two most commonly used HTTP methods for request and response between the client and the server. GET method basically requests data from a specified resource, whereas Post method submits data to be processed to a specified resource.
In mobile applications, you may notice image, video and other files that attract users and provide a better utility. These files are stored on the cloud. Cloud file storage is a storage service that is delivered over the internet.
Cloud file storage is most appropriate for unstructured data or semi-structured data, such as documents, spreadsheets, presentations, and other file-based data. There are several cloud storage providers with different features and price plans like AWS, Dropbox, Firebase storage etc.
In this post, we are going to see how you can upload a image on Firebase storage in a Flutter Application. In fact not only images you can use this firebase storage tutorial to upload any kind of file to firebase storage. I’ll explain, how you can create a Flutter application with a file upload feature that allows users to upload a image file from camera and gallery to cloud and display uploaded files in a grid list. For this, I’ll use Firebase cloud storage which can be accessed using Firebase SDK for cloud storage.
To make a big application, we always need some rest API's to provide a dynamic feature to the user. These API often supports JSON as a data format for communication through HTTP protocol.
If you have worked with native Android application development. You definitely missing those POJO classes in Flutter. After hit a request to the server, the server will return a JSON string. If you want to use data flexibly, we need to convert the JSON string into an object.
Pull to Refresh or Swipe Down is a common feature of all big mobile Application. You might have seen it in a lot of mobile apps like Twitter and Facebook provides a feature to swipe or pull down to refresh its content. When you swipe from top to bottom of the screen. After that, a loader will be shown and will disappear once the new content is loaded.
In this post, we are going to build a Flutter Application to achieve it. Flutter SDK providing us RefreshIndicator to apply a pull to refresh on any screen. To apply a pull to refresh on any screen, we have to wrap the root widget of the screen inside of RefreshIndicator.
We always use listview to display too many items like contact numbers and products in any shopping application. Let's assume a situation, you want to see an item that's placed in the bottom of list. So, it will irritate you to always scroll it down to see a particular item.
In mobility, we can make it easy with the help of a search feature. ListView with search functionality helps the user to easily get the required results. In the search box, we can filter the data according to data entered by the user and this option is really necessary for making it user-friendly. By using this feature user can filter items by name, occupation, address, etc. Search functionality reduces navigation complexity for the user and also saves the user’s valuable time.
Firebase Realtime Database is a cloud-hosted database that helps us to store and sync data with NoSQL database in realtime to every connected client platforms like Android, iOS, and Web.
Nowadays NoSQL databases are gaining popularity and Firebase Realtime Database is one of the NoSQL databases. Firebase store all the data in JSON format and any changes in data reflects immediately by performing a sync operation across all the platforms. This allows us to build a flexible realtime app easily with minimal efforts.
If you are working on a big application with Android Studio and you may want to securely store the project code to a remote server. For this purpose, we can use BitBucket repository system. Which will allow you to create a repository and push all source code safely.
It is an online Application for versioning control, web-based storage of codes. In simplest term, it can contain a repository of project source codes in Mercurial or Git revision control system. It’ll provide you all Git features with Project management system. So you can create Multiple branches, Tags and manage your source code safely even with multiple developers working on the same project.
To make a big mobile application, we always need API's to get dynamic JSON data from the server. JSON is text-based, human-readable data interchange format that is used for representing simple data structures and objects. By using text-based JSON, we can create a list of objects in mobile and web application.
But sometimes in the mobile applications, we have to put JSON file in the application package rather than get it from the server. In the mobile application, we can put it in anywhere in the application directory as per platform guideline. Such as in Android and Flutter, we can put a JSON file in the assets folder and parse it on runtime to get the data and use it accordingly.
Infinite scroll or load more list is the popular replacement of pagination in a mobile application. With the help of pagination, you can display big data in a small piece of data.
Pagination is a common feature in heavy content apps. It breaks down a list of content into equal smaller pieces and loaded one at a time. Such as, in Facebook, Twitter and Instagram, we spend countless hours scrolling. They just don’t seem to end.
In mobility, if you going to make a app that have a ton of content that takes too long to load. From a developer perspective, how would you load all of that content?. It is not possible to make a call for such huge content at one go. We’ll have to request them in parts or pages.
From this home screen, the user can perform other tasks that show a result in other screens. These screens will usually take the form of activity and fragment within the app. An end user can navigate on all other screens with the help of screen gestures, button clicks, and menu selections. All of the work involved in navigation between destinations and stack that is handled by a navigation controller. Without navigation, we have to write a very big manual code to move from one screen to another screen that creates complex navigation paths. 
