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This example demonstrates how to update listview after insert values in Android sqlite using Kotlin.Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.Example Step 3 − Add the following code to src/MainActivity.ktimport android.os.Bundle import android.widget.* import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { private lateinit var save: Button private lateinit var refresh: Button private lateinit var name: EditText private lateinit var salary: EditText ... Read More
This example demonstrates how to prevent a dialog from closing when a button is clicked using Kotlin.Step 1 − Create a new project in Android Studio, go to File ? New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.Example Step 3 − Add the following code to src/MainActivity.ktimport androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.Button import android.widget.Toast import androidx.appcompat.app.AlertDialog class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" val dialog: ... Read More
This example demonstrates how to create Focusable EditText inside ListView on Android using Kotlin.Step 1 − Create a new project in Android Studio, go to File ? New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.Example Step 3 − Add the following code to src/MainActivity.ktimport androidx.appcompat.app.AppCompatActivity import android.annotation.SuppressLint import android.app.LauncherActivity import android.content.Context import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.BaseAdapter import android.widget.EditText import android.widget.ListView import java.util.ArrayList class MainActivity : AppCompatActivity() { private lateinit var listView: ListView private lateinit var myAdapter: MyAdapter override ... Read More
This example demonstrates how to create clickable links in a TextView on Android using Kotlin.Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.Example Step 3 − Open res/values/strings.xml and add the following code Your app Name Tap here to open Google Step 4 − Add the following code to src/MainActivity.ktimport androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.text.method.LinkMovementMethod import android.widget.TextView class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { ... Read More
This example demonstrates how to turn on flashlight programmatically in Android using Kotlin.Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xmlExample Step 3 − Add the following code to src/MainActivity.ktimport android.content.Context import android.content.DialogInterface import android.content.pm.PackageManager import android.hardware.camera2.CameraAccessException import android.hardware.camera2.CameraManager import android.os.Build import android.os.Bundle import android.widget.ToggleButton import androidx.appcompat.app.AlertDialog import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { private lateinit var cameraManager: CameraManager private lateinit var cameraId: String private lateinit var toggleButton: ToggleButton ... Read More
Suppose we have three integers n, m, and k. If we have following algorithm to find the maximum element of an array of positive integers −max_val := -1 max_ind := -1 search_cost := 0 n := size of arr for initialize i := 0, when i < n, update (increase i by 1), do: if max_val < arr[i], then: max_val := arr[i] max_ind := i (increase search_cost by 1) return max_indWe have to make the array arr which has the following criteria: arr has exactly n integers. all elements arr[i] are in range 1 to m(including) (0
This example demonstrates how toStep 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.Example Step 3 − Add the following code to src/MainActivity.ktimport android.Manifest import android.content.ContentValues import android.content.Intent import android.content.pm.PackageManager import android.net.Uri import android.os.Bundle import android.provider.MediaStore import android.widget.Button import android.widget.ImageView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import androidx.core.app.ActivityCompat import androidx.core.content.ContextCompat class MainActivity : AppCompatActivity() { lateinit var button: Button private lateinit var imageView: ImageView lateinit var imageUri: Uri private val permissionCode ... Read More
Suppose we have a grid whose size is n x 3 and we want to paint every cell of the grid with exactly one of the three colors. Here the colors that will be used are Red, Yellow and Green.Now there is a constraint, that is no two adjacent cells have the same color. We have n number of rows of the grid. Finally, we have to find the number of ways we can paint this grid. The answer may be very large so return it modulo 10^9 + 7.So, if the input is like 1, then the output will ... Read More
Suppose there is a maze with empty spaces and walls and there is also a ball in that maze. The ball can go through empty spaces by rolling up (u), down (d), left (l) or right (r) directions, but it keeps rolling until hitting a wall. When the ball stops, it could choose the next direction. One hole is also in that maze. The ball will drop into the hole if it rolls on to the hole.So if we have the ball position, the hole position and the maze, we have to find out how the ball could drop into ... Read More
This example demonstrates how to convert a Drawable to a Bitmap in Android using Kotlin.Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.Example Step 3 − Add the following code to src/MainActivity.ktimport android.graphics.BitmapFactory import android.os.Bundle import android.widget.Button import android.widget.ImageView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" val imageView: ... Read More