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What is Android App Fragment?

The life cycle of an Android App Fragment is controlled by callback methods. Among them are onCreate, onStart, onResume, onPause, and onDestroy. Each callback method is called when the fragment reaches a specific state or the time when it no longer needs to be displayed. A fragment may also be detached from an activity at the end of its life cycle.

Fragments must be empty to be re-instantiated when an activity reaches the end of its lifecycle. If a subclass has constructors with arguments, the caller will not be able to use these methods when re-instantiating the fragment. However, fragments may provide arguments to the caller with setArguments(Bundle) and can retrieve these arguments from the Fragment object using getArguments().

Fragments should not communicate with each other directly. They should communicate with the host activity. In such a case, the fragment should define an interface as an inner type. This allows the host activity to implement the interface and avoid fragments knowing too many details about the host activity. For example, a fragment can check in an onAttach() method whether the host activity has implemented the interface it needs. If the host activity has implemented the interface, it can use the fragment’s onAttach() method to retrieve that value.

When Should I Use a Fragment Android?

When should I use a fragment? The answer to this question depends on what the app is for. A typical example is an activity with a list of items. A tablet user sees the details immediately while a smartphone user jumps to a new detail view. In this article, I assume that there are two fragments: one for the main activity and another for the handheld version. Fragments can be used in these cases, as long as they don’t depend on the Activity.

While fragments have different uses, it is best to use them early in the lifecycle. They should be created before other activity instances so that they don’t overlap. Fragments should not know about each other; a fragment can be in multiple activities at once. As long as the fragment has its own unique ID, it is appropriate to create it early in the app’s lifecycle. This helps you optimize the fragments’ performance and design.

What Types of Fragments are in Android?

Fragments are reusable modules of UI content. Each fragment in an application needs to associate with a parent FragmentActivity. Fragments can be defined in an activity’s layout XML file. Fragments must have a defined lifecycle and communicate with its parent activity. They must also coordinate their interactions with other fragments. In this article, we’ll look at the lifecycle of fragments and their roles.

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Fragments are reusable components that simplify the user’s experience of the application. For example, if the user is using a tablet, the fragments can be split into two parts: a list of songs and a currently playing song. This allows users to easily navigate between the two views without switching to a different screen. Fragments are particularly useful for apps with a simple design, such as a music player.

Fragments have callback methods that help manage their lifecycles. The onCreate() method is called when a fragment is added to an activity. The onCreateView() method then creates the view for the fragment. The returned view is then displayed. And that’s how fragments work in Android. You’ve probably noticed that Android has many fragments that work the same way.

Are Fragments Still Used in Android?

Are Fragments Still Used in Android? The answer to this question depends on your app. Generally, you should use the v4 support library when you are creating Android apps. This is because the Android team backports new features to this library. Android 9.0 deprecates platform fragments, so you should use the v4 support library instead. However, this will depend on the specific requirements of your app.

The lifecycle of a fragment is affected by the host activity, which is how the fragment is created. Fragments can only receive callbacks from an activity in a particular state. If an activity is in the resumed state, it can freely add or remove fragments. Otherwise, the fragment lifecycle is pushed through the activity. Hence, the fragment lifecycle is very important in an application.

Another reason why fragments are useful in Android is that they can reuse some components and logic within an application. Fragments are best used when you need to reuse parts of an application, such as events or views, and can contribute to the action bar of an activity. The fragments can be dynamically added to the activity. This allows for a more flexible user interface. It also simplifies the reuse of logic and components.

What is Fragment And Activity in Android?

The lifecycle of a fragment is closely connected to that of an activity. Its existence enables it to manage its state and resources. Android provides two types of fragments: platform version fragment and support library fragment. Both types are installed in your project in the same way as third-party libraries. You can determine how many fragments you want to include in your activity, and use the onPause() method to ensure that your fragment is not in use.

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A fragment defines the user interface of an application. A fragment may call back into an activity using its shared ViewModel. The following code demonstrates the use of fragments in a standard Android application. This code does not use a support library, but uses a standard Android application. A typical screenshot in landscape and portrait modes will demonstrate the use of two fragments. If you are unsure of the use of either of these two methods, refer to the Android documentation for details.

Why We Use Fragments Instead of Activities?

Why We Use Android App Fragments instead Of Activities

As a developer, you’ve probably wondered why we’d switch to fragments in the first place. Fragments are much more efficient than Activities, and have several benefits. As the name implies, fragments can be used as parts of an activity, and are easier to manage. The fragments themselves are easy to use in different apps, as long as they match their functionality and follow best practices.

For starters, fragments simplify the maintenance of back stacks. Activities have a fixed back stack, which means you don’t have to worry about re-maintaining it yourself. Fragments are more flexible, allowing you to create modular UI elements on the same screen. Moreover, they support multiple layouts on various devices. Fragments help you deliver consistent user experience.

When you create a fragment, Android calls the onCreate method, which initializes the fragment. It also inflates the layout and saves its state when it’s paused. The onPause method is called when the fragment is replaced by another fragment. The onResume method reactivates the fragment and the onStop method hides the UI. And the onDetach method detaches the fragment processes from the activity.

Why We Should Use Fragment Instead of Activity?

Why We Should Use Android App Fragment Instead of Activity? Android API 11+ introduces a new class called Fragment. Google suggests using fragments instead of activities, but doesn’t really explain why. While we can use fragments for simple examples, they are far more flexible for complex UI. Let’s look at some of the benefits of fragments over activities. In this article, we’ll discuss how to implement them.

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First of all, a fragment has its own lifecycle. When a user leaves a fragment, the system calls the onPause() method, which normally commits any changes. The onDestroy() method, on the other hand, cleans up the fragment. In general, Android provides two fragment types: the platform version fragment and the support library fragment. The former is added to the project the same way as a third-party library.

A fragment enables modular activity design. Fragments have their own layout, behavior, and life cycle callbacks, and can be added to a running activity. These can be combined to build multi-pane UIs. Fragments are also more flexible, because they are easier to reuse than activities. The fragment life cycle is closely tied to the life cycle of the host activity. In the event of a fragment being added to an activity, the activity will stop, and all fragments will terminate.

Why Fragment is Used in Android?

If you’re wondering why fragment is used in Android, you’ve come to the right place. First, let’s define what a fragment is. This is a re-usable, small-sized component. It can contain several activities on a single screen, while still allowing for a large number of activities. Furthermore, fragments don’t have to be serialized, so you can use them with both smartphones and tablets.

When creating a fragment, the system calls the onCreate() method. The creator of a fragment must initialize the view and make sure to keep it when the fragment is stopped or paused. The onCreateView() callback is called when the fragment first draws the UI. The fragment must also return a View component, which is the root of the layout. The fragment can also return a null if it doesn’t provide any UI.

The fragment’s usage in an android application depends on the screen size. While it can be used on larger screens, it is best to use separate activities on smaller devices. This is because the fragment is modular and independent. It’s easier to separate fragments and reuse them across devices and screen sizes. Fragments help keep the code structure more organized and easier to maintain. When used in an app, a fragment can greatly speed up the application’s responsiveness.

Learn More Here:

1.) Android Help Center

2.) Android – Wikipedia

3.) Android Versions

4.) Android Guides