A container is a view used to contain other views. Android offers a collection of view classes that act as containers for views. These container classes are called layouts, and as the name suggests, they decide the organization, size, and position of their children views.
What is the container in the fragment in Android?
FragmentContainerView is a customized Layout designed specifically for Fragments. It extends FrameLayout , so it can reliably handle Fragment Transactions, and it also has additional features to coordinate with fragment behavior.
What is the main purpose of a ViewGroup?
What is the main purpose of a ViewGroup? It groups together the most common views that developers use in Android apps. It serves as a container for View objects, and is responsible for arranging the View objects within it. It is required to make a view interactive as a way to group TextViews on a screen.
Which file contains the containers used in Android?
Android Package (APK) is the Android application package file format used by the Android operating system, and a number of other Android-based operating systems for distribution and installation of mobile apps, mobile games and middleware.What are Viewgroups in Android?
A ViewGroup is a special view that can contain other views. The ViewGroup is the base class for Layouts in android, like LinearLayout , RelativeLayout , FrameLayout etc. In other words, ViewGroup is generally used to define the layout in which views(widgets) will be set/arranged/listed on the android screen.
When should I use FragmentContainerView?
FragmentContainerView is now the recommended View to use in order to host Fragments instead of the previously common way of using FrameLayouts. In addition to correctly handling Fragment transactions under the hood, it has some additional features that coordinate with Fragment behavior.
Can a fragment exist without UI?
The Android Developer guide has a decent section on the use of Fragments. One way to use Fragments is without a UI.
What is APK file in Android?
(Android application PacKage) An application file ready for installation in an Android device. The compressed APK file, which is a ZIP archive in the JAR format, is distributed to Android users for installation in their smartphones and tablets. See Android and JAR.Are APK files safe?
Because the APK files install apps on your system, they can pose a serious security threat. A person will malicious intentions could modify the APK before you install it, then use it as a digital Trojan horse to install and run malware. Thus, you need to ensure that the site you use is reliable.
What is ANR Android?When the UI thread of an Android app is blocked for too long, an “Application Not Responding” (ANR) error is triggered. If the app is in the foreground, the system displays a dialog to the user, as shown in figure 1. The ANR dialog gives the user the opportunity to force quit the app.
Article first time published onWhat is parent and child in android layout?
on the hierarchy parents are toplevel and child is below.so when you come to android layout parent is container and child is the content.
What are view and ViewGroup classes in android?
ViewGroup is the base class for layouts and view containers. View is the SuperClass of All component like TextView, EditText, ListView, etc.. while ViewGroup is Collection of Views (TextView, EditText, ListView, etc..) , somewhat like container.
How do I find the location of my android phone?
- Provide permissions in manifest file for receiving location update.
- Create LocationManager instance as reference to the location service.
- Request location from LocationManager.
- Receive location update from LocationListener on change of location.
What is the permission for using camera?
Manifest declarations Camera Permission – Your application must request permission to use a device camera. Note: If you are using the camera by invoking an existing camera app, your application does not need to request this permission. For a list of camera features, see the manifest Features Reference.
What is persistent in Android?
Persistent data is data which you want to be available even after you fully close and restart your app. The three most common ways to safe this data localy is by using SharedPreferences, a local database or the file system (store data as a file).
What is a thread in Android?
A thread is a thread of execution in a program. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently. Every thread has a priority. … One is to declare a class to be a subclass of Thread . This subclass should override the run method of class Thread .
What is headless fragment?
Headless Fragments are Fragments which do not have any UI, i.e. they do not inflate any XML resource or create and return a View. In terms of MVC(Model View Controller), they contain only the Controller part without actually be responsible directly for controlling a View.
Can we create fragment without activity in Android?
Fragment can’t be initiated without Activity or FragmentActivity. As soon as you create an instance of the Fragment class, it exists, but in order for it to appear on the UI, you must attach that fragment to an activity because a fragment’s lifecycle runs parallel to an activity’s lifecycle.
Why do we use headless fragments?
Fragments can be used without defining a user interface. It is recommended to use headless fragments for your background processing.
What is FrameLayout Android?
FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that’s scalable to different screen sizes without the children overlapping each other.
What is Android CoordinatorLayout?
CoordinatorLayout is a super-powered FrameLayout . CoordinatorLayout is intended for two primary use cases: As a top-level application decor or chrome layout. As a container for a specific interaction with one or more child views.
How do I load an activity fragment?
Code to load a fragment: //add this inside the Oncreate or where you want to load activity. Fragment fragment; fragment = new HomeFragment();loadFragment(fragment);
Is APK a virus?
Your Android phone is vulnerable to viruses and malware if you download apk files from untrusted websites. Therefore, it’s important to find a reliable source such as apktovi.com to download. If you still don’t believe in the security of an apk file, we will show you some tools to help you scan and check it.
Are APK files illegal?
Yes, APK is completely legal. It is the native file format that developers use to package an Android app; even Google uses it. APK means the format of the file and says nothing about the legality of its contents. For example, a png, which is a completely legal file format, can be used to store child porn.
What is APKPure used for?
APKPure is an open-source service that provides users with direct access to APK (Android application) files. These files can be downloaded on many devices that can run Android, including phones, tablets, e-readers, and specific models of computers, cameras, and smartwatches.
What is XAPK and APK?
An XAPK file is a package used to install Android apps on mobile devices. It is similar to the standard . APK format, but may contain other assets used by the app, such as an . OBB file, which stores graphics, media files, and other app data.
What is obb file?
An . obb file is an expansion file used by some Android apps distributed using the Google Play store. It contains data not stored in the application’s main package (. APK file), such as graphics, media files, and other large program assets. For example, a game such as Free Fire has a 20 MB .
What is the difference between APK and app?
App stands for application. There any many app such as Android App, windows phone app, iOS app, Web app, Windows PC app, OS X app. But APK stands for Android Application package it can only be installed in Android. An APK comes under the category of apps.
What is crashes and ANR?
ANR stands for Application Not Responding. An ANR will occur if you are running a process on the UI thread which takes a long time, usually around 5 seconds. … A crash is when an exception within the app has been thrown which has not been handled.
What is Tombstone Android?
The tombstone is a file with extra data about the crashed process. In particular, it contains stack traces for all the threads in the crashing process (not just the thread that caught the signal), a full memory map, and a list of all open file descriptors.
What are some best practices to avoid memory leaks on Android?
- Do not keep long-lived references to a context-activity (a reference to an activity should have the same life cycle as the activity itself)
- Try using the context-application instead of a context-activity.
