SQLite is embedded within the Android operating System, so you don’t need anything external on Android to use SQLite.SQLite is written in C programming language.SQLite is RDBMS (Relational Database Management System).SQLite is used as a Local Database in android.įour Major things to understand about SQLite: So before we start coding our app, let’s understand few things about SQLite.
Please let us know about any question or suggestions that come to your mind.Learn how to Insert Update Delete Retrieve Records in SQLite Database in Android You can send selected fields with their values and don’t blow up the request body with unnecessary or already known information. Outlookįorm-urlencoded requests are convenient to create the desired request payload without defining a class representing the data. Encoding enabled has the result username=marcus%2Dpoehls. With the default behavior ( encoded=false), the key-value-pair results in username=marcus-poehls. We want to update the username field to the new value marcus-poehls. To specify the encoded option value, you need to pass it within the annotation. The encoded option defines whether each provided key-value-pair is already url encoded.
The example below outlines the code example to activate the encoded option. encoded: can be either true or false default is false.The annotation has an option field for encoding: That requires some additional documentation within your code and if that’s the only thing to be aware of, go for it! FieldMap Options Of course, there’s a dark side attached to this approach: you don’t intuitively know which fields are allowed and what are their names. You’ll find various applications to in your app. Your request payload only consists of the single field! Specifically, if you only want to update the username, there’s no need to add any other field than the username. public interface UserService Map fields) You can add the desired key-value-pairs to a standard Java Map implementation and they will be translated as you go. In situations where you just need to send selected fields that should be updated for a given user, using Retrofit’s is a lot more elegant. It blows up your code and imagine that the number of parameters doubles or even triples evolutionary! The length of the method call text will explode Android Studio’s canvas.Īctually, there’s a more elegant solution already integrated with Retrofit: Form Encoded Requests Using FieldMap The downside: every time we want to send an update with the new user data, we have to provide a value for each parameter even though they didn’t change. The PUT request requires values for multiple parameters like username, email, homepage, etc. public interface UserService String String String String String location You’re tempted to define the API endpoint on client-side using the following interface definition. We want to use a form-urlencoded request, because the API accepts a JSON object representing the fields that should be updated. Assuming that you have the option to update user data within your Android app, you want to call an API endpoint that takes an object of key-value-pairs. Let’s shift focus to an example that makes things more approachable. There are multiple annotations for different kinds of situations, like adding query or path parameters, request payload using a given object or create the body from fields with form-urlencoded requests. You’re already familiar with Retrofit’s annotation to map parameter values into appropriate format.