rohitjakhar

Interview Questions

Kotlin

Q1: What is a primary constructor in Kotlin? ☆☆

Answer: The primary constructor is part of the class header. Unlike Java, you don't need to declare a constructor in the body of the class. Here's an example:

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Android Interview Questions

Q1: Explain activity lifecycle ☆☆

Answer: As a user navigates through, out of, and back to your app, the Activity instances in your app transition through different states in their lifecycle.

To navigate transitions between stages of the activity lifecycle, the Activity class provides a core set of six callbacks: onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy(). The system invokes each of these callbacks as an activity enters a new state.

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@ExperimentalCoroutinesApi
inline fun <reified T> DatabaseReference.observeValue(): Flow<NetworkResponse<List<T>>> =
    callbackFlow {
        val listener = object : ValueEventListener {
            override fun onCancelled(error: DatabaseError) {
                trySend(NetworkResponse.Failure(message = error.message))
            }

            override fun onDataChange(snapshot: DataSnapshot) {
                val hostList = arrayListOf<T>()

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    private val onDownloadCompleteReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context?, intent: Intent?) {
            if (intent == null) {
                log("onDownloadComplete intent is: $intent")
                return
            }
            if (intent.action == DownloadManager.ACTION_DOWNLOAD_COMPLETE) {
                val id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1)
                val downloadedFileURI = mDownloadManager?.getUriForDownloadedFile(id)
                viewModel.enqueuedDownloadingTasksIds.let { enqueuedTasks ->

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package com.parrychat.android.ui.call

import android.Manifest
import android.annotation.SuppressLint
import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.MotionEvent
import android.view.SurfaceView
import android.view.View

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            FLAG_GRANT_READ_URI_PERMISSION,
            FLAG_GRANT_WRITE_URI_PERMISSION,
            FLAG_FROM_BACKGROUND,
            FLAG_DEBUG_LOG_RESOLUTION,
            FLAG_EXCLUDE_STOPPED_PACKAGES,
            FLAG_INCLUDE_STOPPED_PACKAGES,
            FLAG_GRANT_PERSISTABLE_URI_PERMISSION,
            FLAG_GRANT_PREFIX_URI_PERMISSION,
            FLAG_DEBUG_TRIAGED_MISSING,
            FLAG_IGNORE_EPHEMERAL,

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package com.rohit.healthOn.ui.homeScreen

import android.os.Bundle
import android.os.VibrationEffect
import android.os.Vibrator
import androidx.activity.viewModels
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.isVisible
import androidx.lifecycle.lifecycleScope
import androidx.navigation.NavController

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package com.rohit.healthOn.ui.homeScreen

import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import com.rohit.healthOn.data.repo.AuthRepo
import com.rohit.healthOn.data.repo.SleepRepo
import com.rohit.healthOn.data.repo.WaterRepo
import com.rohit.healthOn.util.ERROR_TYPE
import com.rohit.healthOn.util.Resource
import dagger.hilt.android.lifecycle.HiltViewModel

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package com.rohit.healthOn.ui.homeScreen.dashboardScreen

import android.os.Bundle
import android.view.View
import androidx.fragment.app.Fragment
import androidx.fragment.app.viewModels
import androidx.lifecycle.lifecycleScope
import com.google.android.material.tabs.TabLayoutMediator
import com.rohit.healthOn.R
import com.rohit.healthOn.databinding.FragmentDashboardBinding

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package com.rohit.healthOn.ui.homeScreen.dashboardScreen.sleep

import android.os.Bundle
import android.view.View
import androidx.core.view.isVisible
import androidx.fragment.app.Fragment
import androidx.fragment.app.viewModels
import androidx.lifecycle.lifecycleScope
import com.rohit.healthOn.R
import com.rohit.healthOn.databinding.FragmentSleepDashboardBinding