Battery optimization based Android interview questions and answers

What is doze mode?

Device enters doze mode if, an user leaves it unplugged and stationary for a period of time, with the screen off. In doze mode network access and and CPU-intensive services are restricted.
Periodically, the system exits Doze for a brief time to let apps complete their deferred activities.
Systems exits doze mode if user wakes the device by moving it, turning on the screen, or connecting a charger.

Reference
http://developer.android.com/training/monitoring-device-state/doze-standby.html

What is App Standby?

An application goes to App Standby mode if the user does not touch the app for certain period of time and none of the following conditions happened:
  • you explicitly launch the app
  • The app has a process currently in the foreground
  • The app produces a notification

When in standby mode, network access and background sync jobs are restricted.
When user plugs the device into a power supply, system releases apps from standby mode.

Reference
http://developer.android.com/training/monitoring-device-state/doze-standby.html


Comments

Post a Comment

Popular posts from this blog

Jetpack Compose based Android interview and questions

What’s Jetpack Compose and its Benefits? Jetpack Compose is a modern UI toolkit recently launched by Google which is used for building native Android UI. It simplifies and accelerates the UI development with less code, Kotlin APIs, and powerful tools.  Declarative Compatible Increase development speed Concise and Idiomatic Kotlin Easy to maintain Written in Kotlin To read more, refer  to  the article:  Jetpack Compose in Android Aaaaaa
Read more

Null safety based Kotlin interview questions and answers

Image
Nullable Non Nullable Types What’s Null Safety and Nullable Types in Kotlin? What is the Elvis Operator? Kotlin puts a lot of weight behind null safety which is an approach to prevent the dreaded Null Pointer Exceptions by using nullable types which are like  String? ,  Int? ,  Float?  etc. These act as a wrapper type and can hold null values. A nullable value cannot be added to another nullable or basic type of value. To retrieve the basic types we need to use safe calls that unwrap the Nullable Types. If on unwrapping, the value is null we can choose to ignore or use a default value instead. The Elvis Operator is used to safely unwrap the value from the Nullable. It’s represented as  ?:  over the nullable type. The value on the right hand side would be used if the nullable type holds a null. var str: String ? = "JournalDev.com" var newStr = str?: "Default Value" str = null newStr = str?: "Default Value" How is  !! different from ?. in unwrapping t
Read more

CustomView based Android interview questions and answers

1) Design one custom view for displaying TextView in UI with a attributes tribute like Title and Colour. When we need to create any custom view in Android, we will extend our class from the View parent class. In this scenario, as we need to create a custom Text view so we will create a subclass of TextView class.  And then we can our Custom textview in a layout.xml file. For example please follow below code where I am trying to create Custom TextView CustomTextView extends TextView { private String title;     private boolean color; title = tarry.getString(R.styleable.CustomTextView_settitle);             if(title == null)             setText("Custom Message");             else                 setText("Welcome to the Class"); color = tarry.getBoolean(R.styleable. CustomTextView _setColor, false);             if(color == true)             setTextColor(Color.RED); } We need to define our custom textview  in \res\layout  folder and write the code like as shown below. &l
Read more