Programming Tutorials

MainActivity.kt package com.cfsuman.kotlingooglemapsexample import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import com.google.android.gms.maps.GoogleMap import com.google.android.gms.maps.OnMapReadyCallback import com.google.android.gms.maps.SupportMapFragment import com.google.android.gms.maps.CameraUpdateFactory import com.google.android.gms.maps.model.MarkerOptions import com.google.android.gms.maps.model.LatLng class MainActivity : AppCompatActivity(), OnMapReadyCallback{ private var mMap: GoogleMap? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment mapFragment.getMapAsync(this) } override fun onMapReady(googleMap: GoogleMap) { mMap = googleMap // Add a marker in Dhaka, Bangladesh, and move the camera. val dhaka...

MainActivity.kt package com.cfsuman.jetpackexamples import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.text.method.ScrollingMovementMethod import kotlinx.android.synthetic.main.activity_main.* import org.jetbrains.anko.doAsync import org.jetbrains.anko.toast import org.jetbrains.anko.uiThread import java.util.* class MainActivity : AppCompatActivity() { private lateinit var mDb:RoomSingleton private val mRandom:Random = Random() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) // Initialize the room database mDb = RoomSingleton.getInstance(applicationContext) // Make the text view scrollable textView.movementMethod = ScrollingMovementMethod() // Insert button click listener btnInsert.setOnClickListener{ // Initialize a new student val student = Student(id = null...

This code demonstrates how to work with HashMaps in an Android application written with Kotlin. HashMaps are a fundamental data structure used to store collections of key-value pairs. The code showcases three types of HashMaps: MutableHashMap, HashMap, and LinkedHashMap. Each type offers slight variations in behavior. The code provides a clear separation between the UI layout (defined in activity_main. xml) and the logic behind the button clicks (implemented in MainActivity. kt). When a button is clicked, it triggers specific functionalities related to the chosen HashMap type. The functionalities include adding key-value pairs, iterating through the map, removing entries, updating values, and checking for emptiness. The results are displayed on the TextView element. Summary This code provides a valuable learning resource for Android developers working with Kotlin. It offers a practical example of using different HashMap types, demonstrating their functionalities and ...

This code demonstrates how to create and use enums in an Android application written in Kotlin. Enums are a special kind of class that defines a set of named constants. They offer several advantages over simple string constants, including improved type safety, readability, and access to additional functionalities. The code includes an example activity ( MainActivity.kt ) that showcases three different types of enums: A basic enum with simple constants (like Position ). An enum with each constant holding a single additional value (like Capital ). An enum with each constant holding multiple additional values (like Country ). The activity displays information about these enums upon clicking corresponding buttons. Summary By following this example, you'll gain a solid understanding of how to define and utilize enums in your Android projects. This approach enhances code maintainability, readability, and reduces the risk of errors by ensuring that only valid values can be ass...