![]() ![]() But this example is too simple It’s hard to have any practical role in a real project, so let’s take a look at the more advanced skills. figure6Īs we expected, the two Android Fragments equally divided the layout of the entire event. So the simplest fragment example has been written, now run the program, the effect is shown in Figure6. Note one Be sure to add the package name of the class. Now start the tablet simulator, the effect is shown in Figure 5Īs you can see, we used the tag to add Android Fragments to the layout, and most of the attributes you specify It is familiar, but here you need to explicitly specify the name of the fragment class to be added through the android:name attribute. Since there seems to be a bug in the tablet simulator of the 4.0 system, here I will create a new tablet simulator of the figure2 system, such as As shown in Figure 4. You already know, broken Tablets are usually used in tablet development, so the first thing we have to do is to create a new tablet simulation Device. Having introduced so many abstract things, it is time to learn the specific usage of fragments. ![]() Therefore, a better design solution is to put the news headline list interface and the news detailed content interface in two pieces respectively Then, the two fragments are introduced in the same activity so that the screen space can be fully utilized, as shown in the figure As shown in figure3. The title of the news is generally not too long, which will result in a lot of blank areas on the interface, as shown in Figure2. However, if you design the same on the tablet, the news headline list will be stretched to fill the entire tablet. If it is designed for a mobile phone, we can put the news headline list in In one activity, put the details of the news in another activity, as shown in Figure1. When one of the headlines is clicked, open another interface to display the detailed content of the news. So how to use the fragments to make full use of the space of the tablet screen? Imagine we are developing a News application, one of the interfaces uses ListView to display a set of news headlines. You can even understand the fragments as a mini activity, although these mini Activities may be as big as normal activities. Although fragmentation should be a brand new concept for you to read, I believe you should have no effort to learn because it is so similar to activities, it can also contain layout, It also has its own life cycle. Experience the life cycle of Android Fragments:Īndroid Fragments– Fragment is a UI fragment that can be embedded in the activity, it can make the program more reasonable and sufficient, Utilize the space of the large screen, so it is widely used on the tablet.Communication between Android Fragments and activities:.Simulate the return stack in the fragment:.In the next chapter, we are going to use it and develop an Intro Application. Cool!! We had learnt about the Fragments. This is all about how the fragment come up within the activity and goes out. OnDetach() - This method called when the fragment is detached from its host activity. OnDestroy() - This method called when the fragment does its final clean up. OnDestroyView() - This method called when the view and related resources created in onCreateView() are removed from the activity’s view hierarchy and destroyed. OnStop() - This method called when the fragment is no longer visible the fragment will get change with other fragment or it gets removed from activity or fragment’s activity called stop. OnPause() - This method called when a fragment is not allowing the user to interact the fragment will get change with other fragment or it gets removed from activity or fragment’s activity called a pause. Fragment resumes only after activity resumes. OnResume() - This method called when a fragment is visible and allowing the user to interact with it. OnStart() - This method called when a fragment is visible. OnActivit圜reated() - This method called when Activity completes its onCreate() method ![]() You can return null if the fragment does not provide a UI. To draw a UI for your fragment, you must return a View component from this method that is the root of your fragment’s layout. OnCreateView() - The method called when it’s time for the fragment to draw its user interface for the first time. OnCreate() - This method called when a fragment instance initializes, just after the onAttach where fragment attaches to the host activity. We are passing the Activity that will host our fragment. OnAttach() - This method called first, To know that our fragment has been attached to an activity. ![]()
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