Table of Contents
What is single instance in android?
singleInstance This is very special launch mode and only used in the applications that has only one activity. It is similar to singleTask except that no other activities will be created in the same task. Any other activity started from here will create in a new task.
What are the different launch modes in android?
Types of Launch Modes for Activities
- Standard. This is the default launch mode of activity (If not specified).
- Single Task. In this method of operation, a new task is always generated, and a new instance is added to the task as the root one.
- Single Top.
- Single Instance.
What is task affinity in android?
An affinity indicates which task an activity prefers to belong to. By default, all the activities from the same app have an affinity for each other. So, by default, all activities in the same app prefer to be in the same task. However, you can modify the default affinity for an activity.
What are intent flags in android?
Use Intent Flags Intents are used to launch activities on Android. You can set flags that control the task that will contain the activity. Flags exist to create a new activity, use an existing activity, or bring an existing instance of an activity to the front.
What is single top?
An Activity with singleTask launchMode is allowed to have only one instance in the system (a.k.a. Singleton). If there is an existed Activity instance in the system, the whole Task hold the instance would be moved to top while Intent would be delivered through onNewIntent() method.
What is a single-instance?
Single-instance storage (SIS) is a system’s ability to take multiple copies of content and replace them by a single shared copy. It is a means to eliminate data duplication and to increase efficiency.
What is launch single top navigation?
Single Top means that if you launch an activity that is already on top, it wont be created again just resumed. The reason your back navigation close the app is because you are calling finish() just after you start a new activity.
What is a fragment in Android?
A Fragment represents a reusable portion of your app’s UI. A fragment defines and manages its own layout, has its own lifecycle, and can handle its own input events. Fragments cannot live on their own–they must be hosted by an activity or another fragment.
What is the difference between singleTop and singleTask?
The modes fall into two groups. standard and singleTop comes in one side and singleTask and singleInstance comes in another side. The main difference between standard and singleTop is in standard, every time a new intent for standard activity, a new instance is created.
What is FLAG_ACTIVITY_NEW_TASK?
For this I consulted the Android docs for the FLAG_ACTIVITY_NEW_TASK flag- When using this flag, if a task is already running for the activity you are now starting, then a new activity will not be started; instead, the current task will simply be brought to the front of the screen with the state it was last in.
What is single instance and multiple instance?
Therefore, a single-instance ERP solution is one that uses the ERP system for all your business operations—on either the front end or the back end. Multiple-instance ERP solutions are commonly used by businesses that operate globally to accommodate each country’s needs or financial systems.
How do I make an application a single instance?
How To Run A Single Instance Of Your Application
- Create a class file named SingleInstance. cs in your project. public sealed class SingleInstance. { public static bool AlreadyRunning()
- Step2. Create a class file named User32API. cs. using System.Runtime.InteropServices;
- Implement this in our application.
What are the types of services in Android?
Types of Android Services
- Foreground Services:
- Background Services:
- Bound Services:
- Playing music in the background is a very common example of services in android.
- Step 1: Create a new project.
- Step 2: Modify strings.xml file.
- Step 3: Working with the activity_main.xml file.
- Step 4: Creating the custom service class.
What is the difference between intent and intent filters?
An intent is an object that can hold the os or other app activity and its data in uri form.It is started using startActivity(intent-obj).. \n whereas IntentFilter can fetch activity information on os or other app activities.
Which is better activity or fragment?
It has its own layout and its own behavior with its own life cycle callbacks. We can add or remove fragments in an activity while the activity is running….Difference Table.
| Activity | Fragment |
|---|---|
| Activity can exist without a Fragment | Fragment cannot be used without an Activity. |
What is the difference between activity and context?
In android, context is the main important concept and the wrong usage of it leads to memory leakage. Activity refers to an individual screen and Application refers to the whole app and both extend the context class.