Android basics interview Questions answers in Hindi 5

When does ANR occur?
The ANR dialog is displayed to the user based on two possible conditions. One is when there is no response to an input event within 5 seconds, and the other is when a broadcast receiver is not done executing within 10 seconds.

How can the ANR be prevented?
One technique that prevents the Android system from concluding a code that has been responsive for a long period of time is to create a child thread. Within the child thread, most of the actual workings of the codes can be placed, so that the main thread runs with minimal periods of unresponsive times.

How does android track the application on process?
Android provides a Unique ID to all applications is called as Linux ID.
This ID is used to track each application.

What is the use of LINUX ID in android?
A unique Linux ID is assigned to each application in android. It is used for the tracking of a process.

What is ViewGroup?
A ViewGroup is a special view that can contain other views. Ex – LinearLayout, RelativeLayout etc.

What are application Widgets in android?
Application widgets are miniature application views that can be embedded in other applications and receive periodic updates.
App Widgets are miniature application views that can be embedded in other applications (such as the Home screen) and receive periodic updates. These views have referred to as Widgets in the user interface, and you can publish one with an App Widget provider.

What are the different storages available in android?
The various storage provided by android are:
Shared Preferences
Internal Storage
External Storage
SQLite Databases
Network Connection

How many dialog boxes do support in android?
Android supports four types of dialog boxes:
AlertDialog: It has a maximum of 3 buttons and sometimes AlertDialog includes check boxes and Radio buttons to select the element.
ProgressDialog: It displays the progress bar or wheels.
TimePickerDialog: Using this dialog box, a user selects the Time.
DatePickerDialog: Using this dialog box, a user selects the Date
(DialogFragment)

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Basic android interview questions answers in Hindi 4

What is the use of an activity Creator?
An activity Creator is the first step towards the creation of a new Android project. It is made up of a shell script that will be used to create new file system structure necessary for writing codes within the Android IDE. it’s been long , this has been replaced by “Create new Project”.
What are Activities?
Activities are what you refer to as the window to a user interface. Just as you create windows in order to display output or to ask for an input in the form of dialog boxes, activities play the same role, though it may not always be in the form of a user interface.

What’s the difference between a file, a class and an activity in android?
File – It is a block of arbitrary information, or resource for storing information. It can be of any type.
Class – Its a compiled form of .Java file . Android finally used this .class files to produce an executable apk
Activity – An activity is the equivalent of a Frame/Window in GUI toolkits. It is not a file or a file type it is just a class that can be extended in Android for loading UI elements on view.

What are the four essential states of an activity?
Active – if the activity is at the foreground
Paused – if the activity is at the background and still visible
Stopped – if the activity is not visible and therefore is hidden or obscured by another activity
Destroyed – when the activity process is killed or completed terminated

What is the importance of settings permissions in app development?
Permissions allow certain restrictions to be imposed primarily to protect data and code. Without these, codes could be compromised, resulting to defects in functionality.

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Java Multithreading Interview Questions

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Questions
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185 . What is the need for threads in Java?
186 . How do you create a thread?
187 . How do you create a thread by extending thread class?
188 . How do you create a thread by implementing runnable interface?
189 . How do you run a thread in Java?
190 . What are the different states of a thread?
191 . What is priority of a thread? How do you change the priority of a thread?
192 . What is executorservice?
193 . Can you give an example for executorservice?
194 . Explain different ways of creating executor services .
195 . How do you check whether an executionservice task executed successfully?
196 . What is callable? How do you execute a callable from executionservice?
197 . What is synchronization of threads?
198 . Can you give an example of a synchronized block?
199 . Can a static method be synchronized?
200 . What is the use of join method in threads?
201 . Describe a few other important methods in threads?
202 . What is a deadlock?
203 . What are the important methods in Java for inter-thread communication?
204 . What is the use of wait method?
205 . What is the use of notify method?
206 . What is the use of notifyall method?
207 . Can you write a synchronized program with wait and notify methods?

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