Sensor based Android interview questions and answers

What can sensors measure?

A) Relative humidity
Pressure
Magnetic field
Steps taken
Proximity
The rate of ratation of the device on x,y,z axes

What is a Physical Sensor?

A) Sensors that pieces of hardware that are physically present on the device. Know as Hardware Sensors.

What are Synthetic sensors?

A) Sensors that are not physicall present on the device. They are derived from one or more sensors

What is Raw?

A) Values directly given by the sensor without any correction logic.

Accelerometers, proximity sensors, light sensors,

133) What is Calibrated?

A) Values from sensors that are corrected by the operating system

134) What is Fused?

A) Sensors that gets values from two or more sensors. These values are combined to one value

135) What is SensorManager?

A) Provides access for your app to the sensors.

136) What is Continuous?

A) That report mode when sensor events are generated at a constant rate defined by the sampling peroid

137) What is On change?

A) That report mode when sensor events are generated only if the measured values have changed since the last known value

138) What is One shot?

A) The report mode when sensors only are triggerd once in the entire duration of the event

139) What is Special Trigger?

A) The report mode when the sensor only is trigged when it’s called on. It listen for an event to fire

What is Wake up sensor?

A) Sensor that will wake the Application Processor (AP). up from its suspended mode to report sensor events

279) What is None wake up sensor?

A) Sensors that doesn’t wake the AP. Instead the sensor event is queued in a FIFO queue

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