uwu z

                    @SuppressLint("UnusedMaterialScaffoldPaddingParameter")
    @Preview(showBackground = true)
    @Composable
    fun scaffold() {
        Scaffold(
            topBar = {
                TopAppBar {
                    Text(text = stringResource(id = R.string.app_name))
                }
            },
            bottomBar = {
                BottomAppBar(
                    cutoutShape = MaterialTheme.shapes.small.copy(CornerSize(percent = 50))
                ) {

                }
            },
            floatingActionButton = {
                FloatingActionButton(onClick = { /*TODO*/ }) {
                    Icon(Icons.Filled.Add, contentDescription = "")
                }
            },
            isFloatingActionButtonDocked = true
        ) {
            main()
        }
    }
                  

                    MainActivity.kt:
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.example.newtest.ui.theme.NewTestTheme

class MainActivity : ComponentActivity() {

    private var dataList = ArrayList<String>()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        init()
        setContent {
            NewTestTheme() {
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {
                    listView()
                }
            }
        }
    }

    @Preview(showBackground = true)
    @Composable
    fun listView(){
        LazyColumn{
            items(dataList.size){index ->
                Text(text = dataList[index])
                Spacer(modifier = Modifier.size(3.dp))
            }
        }
    }

    private fun init(){
        dataList.add("BMW E46")
        dataList.add("Honda")
        dataList.add("Benz")
        dataList.add("Lambo")
        dataList.add("BMW X6")
        dataList.add("BMW X4")
    }
}
                  

                    MainActivity.kt:

package com.example.todoapp

import android.app.Activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.activity.result.contract.ActivityResultContracts
import androidx.lifecycle.ViewModelProvider
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
import com.example.todoapp.adapters.RecyclerAdapter
import com.example.todoapp.handler.SwipeToDeleteCallback
import com.example.todoapp.models.ToDo
import com.example.todoapp.viewmodels.ToDoViewModel
import com.google.android.material.floatingactionbutton.FloatingActionButton
import kotlinx.coroutines.MainScope
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {

    private lateinit var recyclerView: RecyclerView
    private lateinit var adapter:RecyclerAdapter
    private lateinit var toDoViewModel: ToDoViewModel
    private lateinit var fab:FloatingActionButton

    private lateinit var swipe:SwipeRefreshLayout

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        init()
    }

    private fun init(){
        bindViews()

        val layoutManager= LinearLayoutManager(this)
        recyclerView.layoutManager=layoutManager
        adapter= RecyclerAdapter(this)
        recyclerView.adapter=adapter
         toDoViewModel= ViewModelProvider(this)[ToDoViewModel::class.java]
        toDoViewModel.getAllData().observe(this){
           adapter.dataSetList(it)
        }
        //adding from 50 ta 65
        val addNewToDoResultActivity=
            registerForActivityResult(ActivityResultContracts.StartActivityForResult()){ result->
                if(result.resultCode==Activity.RESULT_OK){
                    val data=result.data ?: return@registerForActivityResult
                    val title=data.getStringExtra(AddOrEditToDoActivity.EXTRA_TITLE)
                    val description=data.getStringExtra(AddOrEditToDoActivity.EXTRA_DESC)
                    val toDo=ToDo(title=title!!,description=description!!, done = false)
                    MainScope().launch { toDoViewModel.insert(toDo) }
                    Toast.makeText(this,"new todo added",Toast.LENGTH_SHORT).show()
                }

            }
        fab.setOnClickListener{
            val intent=Intent(this,AddOrEditToDoActivity::class.java)
            addNewToDoResultActivity.launch(intent)
        }
        swipe.setOnRefreshListener {
            adapter.notifyDataSetChanged()
            swipe.isRefreshing=false
        }
        val swipeHandler=object :SwipeToDeleteCallback(this){
            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
                MainScope().launch {
                    toDoViewModel.delete(adapter.getToDo(viewHolder.adapterPosition))
                    Toast.makeText(this@MainActivity, "todo item deleted", Toast.LENGTH_SHORT)
                        .show()
                }
            }
        }
        val itemTouchHelper=ItemTouchHelper(swipeHandler)
        itemTouchHelper.attachToRecyclerView(recyclerView)

       // editing from 83 ta 108
        val editToDoResultActivity=
            registerForActivityResult(ActivityResultContracts.StartActivityForResult()){ result->
                if(result.resultCode==Activity.RESULT_OK){
                    val data=result.data ?: return@registerForActivityResult
                    val id=data.getIntExtra(AddOrEditToDoActivity.EXTRA_ID,-1)
                    if(id == -1){
                        Toast.makeText(this,"invalid data",Toast.LENGTH_SHORT).show()
                        return@registerForActivityResult
                    }
                    val title=data.getStringExtra(AddOrEditToDoActivity.EXTRA_TITLE)
                    val description=data.getStringExtra(AddOrEditToDoActivity.EXTRA_DESC)
                   val toDo=ToDo(title=title!!,description=description!!, done = false,id=id)
                    MainScope().launch { toDoViewModel.update(toDo) }
                    Toast.makeText(this," todo updated",Toast.LENGTH_SHORT).show()
                }

            }

        adapter.setOnItemClickListener(object :RecyclerAdapter.OnItemClickListener{
            override fun onItemClick(toDo: ToDo) {
                val intent=Intent(this@MainActivity,AddOrEditToDoActivity::class.java)
                intent.putExtra(AddOrEditToDoActivity.EXTRA_TITLE,toDo.title)
                intent.putExtra(AddOrEditToDoActivity.EXTRA_DESC,toDo.description)
                intent.putExtra(AddOrEditToDoActivity.EXTRA_ID,toDo.id)
                editToDoResultActivity.launch(intent)
            }
        })

        adapter.setOnDoneStateChangeListener(object :RecyclerAdapter.OnDoneStateChangeListener{
            override fun onStateChanged(toDo: ToDo, isChecked: Boolean) {
                toDo.done=isChecked
                MainScope().launch { toDoViewModel.update(toDo) }
            }

        })
    }
    private fun bindViews(){
        recyclerView=findViewById(R.id.recyclerView)
        fab=findViewById(R.id.fab)
        swipe=findViewById(R.id.swipe)
    }
}

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activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/swipe"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="24dp"
        android:layout_marginBottom="16dp"
        android:clickable="true"
        android:contentDescription="@string/app_name"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@android:drawable/ic_input_add" />
</androidx.constraintlayout.widget.ConstraintLayout>

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AddOrEditToDoActivity.kt:

package com.example.todoapp

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.Toast

class AddOrEditToDoActivity : AppCompatActivity() {

    companion object{
        const val EXTRA_ID="EXTRA_ID"
        const val EXTRA_TITLE="EXTRA_TITLE"
        const val EXTRA_DESC="EXTRA_DESC"
    }

     private lateinit var txtTitle:EditText
     private lateinit var txtDescription:EditText
     private lateinit var btnAdd:Button

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_add_to_do)
        init()
    }
    private fun init(){
        bindViews()

        val inputIntent=Intent()
        if(inputIntent.hasExtra(EXTRA_ID)){
            title="edit todo"
            txtTitle.setText(inputIntent.getStringExtra(EXTRA_TITLE))
            txtDescription.setText(inputIntent.getStringExtra(EXTRA_DESC))
            btnAdd.text="update item"
        }else{
            title="add todo"
            btnAdd.text="add new item"
        }

        btnAdd.setOnClickListener {
            val title=txtTitle.text.toString()
            val description=txtDescription.text.toString()
            if(title=="" || description==""){
                Toast.makeText(this,"fil tile and description",Toast.LENGTH_SHORT).show()
                return@setOnClickListener
            }
            val data= Intent()
            data.putExtra(EXTRA_TITLE,title)
            data.putExtra(EXTRA_DESC,description)

            val id=intent.extras?.getInt(EXTRA_ID,-1)
            if(id != -1){
                data.putExtra(EXTRA_ID,id)
            }
            setResult(RESULT_OK,data)
            finish()
        }
    }
    private fun bindViews(){
        txtTitle=findViewById(R.id.txtTitle)
        txtDescription=findViewById(R.id.txtDescription)
        btnAdd=findViewById(R.id.btnAdd)
    }

}

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ToDoViewModel.kt:

package com.example.todoapp.viewmodels

import android.app.Application
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.LiveData
import com.example.todoapp.models.ToDo
import com.example.todoapp.repositories.ToDoRepository

class ToDoViewModel(application: Application) :AndroidViewModel(application){
    private var repository:ToDoRepository= ToDoRepository(application)
    private var allToDoList=repository.getAllToDos()

    suspend fun insert(toDo:ToDo){
       repository.insertToDo(toDo)
   }

    suspend fun update(toDo:ToDo){
        if(toDo.id <=0) return
        repository.updateToDo(toDo)
    }
    suspend fun delete(toDo: ToDo){
        if(toDo.id <=0) return
        repository.deleteToDo(toDo)
    }
    fun getAllData(): LiveData<List<ToDo>> {
        return allToDoList
    }

}

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ToDoRepository.kt:

package com.example.todoapp.repositories

import android.app.Application
import androidx.lifecycle.LiveData
import com.example.todoapp.dao.ToDoDao
import com.example.todoapp.db.ToDoDatabase
import com.example.todoapp.models.ToDo

class ToDoRepository(application: Application) {

    private  var toDoDao:ToDoDao
    private  var allToDoList:LiveData<List<ToDo>>

    init{
        val database=ToDoDatabase.getInstance(application)
        toDoDao= database!!.toDoDao()
        allToDoList= toDoDao.getAllToDos()
    }

    suspend fun insertToDo(toDo: ToDo){
        toDoDao.insertToDo(toDo)
    }
    suspend fun updateToDo(toDo: ToDo){
        toDoDao.updateToDo(toDo)
    }
    suspend fun deleteToDo(toDo: ToDo){
        toDoDao.deleteToDo(toDo)
    }
    fun getAllToDos(): LiveData<List<ToDo>> {
        return allToDoList
    }


}

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ToDo.kt:

package com.example.todoapp.models

import android.widget.Button
import androidx.room.Entity
import androidx.room.PrimaryKey

@Entity
data class ToDo(
    @PrimaryKey(autoGenerate = true) val id:Int=0,
    var title:String,
    var description:String,
    var done:Boolean
)

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SwipToDeleteCallBack:

package com.example.todoapp.handler

import android.content.Context
import android.widget.Toast
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.RecyclerView
import com.example.todoapp.adapters.RecyclerAdapter
import com.example.todoapp.viewmodels.ToDoViewModel
import kotlinx.coroutines.MainScope
import kotlinx.coroutines.launch

  open class SwipeToDeleteCallback(val context: Context):
    ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT) {
    override fun onMove(
        recyclerView: RecyclerView,
        viewHolder: RecyclerView.ViewHolder,
        target: RecyclerView.ViewHolder
    ): Boolean {
        TODO("Not yet implemented")
    }

      override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
          TODO("Not yet implemented")
      }

  }
  
  ➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖
  
  ToDoDatabase.kt:
  
  package com.example.todoapp.db

import android.content.Context
import androidx.room.Database
import androidx.room.Room
import androidx.room.RoomDatabase
import com.example.todoapp.dao.ToDoDao
import com.example.todoapp.models.ToDo

@Database(entities = [ToDo::class], version = 2)
abstract class ToDoDatabase:RoomDatabase() {

    abstract fun toDoDao():ToDoDao

    companion object{
        private var instance: ToDoDatabase? =null
        fun getInstance(context: Context): ToDoDatabase? {
            if(instance==null){
                instance= Room.databaseBuilder(
                    context,
                    ToDoDatabase::class.java,"todo.db"
                ).fallbackToDestructiveMigration().build()
            }
            return instance
        }
    }

}

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ToDoDao.abstract:

package com.example.todoapp.dao

import androidx.lifecycle.LiveData
import androidx.room.*
import com.example.todoapp.models.ToDo

@Dao
interface ToDoDao {

    @Insert
   suspend  fun insertToDo(todo:ToDo)

    @Update
   suspend fun updateToDo(todo: ToDo)

    @Delete
   suspend fun deleteToDo(todo: ToDo)

    @Query(" SELECT * FROM todo ")
    fun getAllToDos() :LiveData<List<ToDo>>


}

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RecyclerAdapter.kt:

package com.example.todoapp.adapters

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.CheckBox
import androidx.recyclerview.widget.RecyclerView
import com.example.todoapp.R
import com.example.todoapp.models.ToDo

class RecyclerAdapter(
    private val context: Context):
    RecyclerView.Adapter<RecyclerAdapter.ToDoHolder>(){

    private val dataList=ArrayList<ToDo>()
    private lateinit var onItemClickListener:OnItemClickListener
    private lateinit var onDoneStateChangeListener:OnDoneStateChangeListener

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ToDoHolder {
        val inflate= LayoutInflater.from(parent.context)
            .inflate(R.layout.todo_item_layout,parent,false)
        return ToDoHolder(inflate)
    }

    override fun onBindViewHolder(holder: ToDoHolder, position: Int) {
        val item=dataList[position]
        holder.checkbox.text=item.title
        holder.checkbox.setOnCheckedChangeListener { buttonView, isChecked ->
            onDoneStateChangeListener.onStateChanged(item,isChecked)
        }

    }

    override fun getItemCount(): Int {
        return dataList.size
    }

    fun dataSetList(list:List<ToDo>){
        dataList.clear()
        dataList.addAll(list)
        notifyDataSetChanged()
    }
    fun getToDo(position:Int): ToDo {
        return dataList[position]
    }

    inner class ToDoHolder(v: View) : RecyclerView.ViewHolder(v) {

        var checkbox:CheckBox =v.findViewById(R.id.chx)

        init {
            v.setOnClickListener{
                onItemClickListener.onItemClick(dataList[adapterPosition])
            }
        }

    }
    interface OnItemClickListener{
        fun onItemClick(toDo: ToDo)
    }
    fun setOnItemClickListener(onItemClickListener:OnItemClickListener){
        this.onItemClickListener=onItemClickListener
    }
    interface OnDoneStateChangeListener{
        fun onStateChanged(toDo: ToDo, isChecked: Boolean)
    }
    fun setOnDoneStateChangeListener(onDoneStateChangeListener:OnDoneStateChangeListener){
        this.onDoneStateChangeListener=onDoneStateChangeListener
    }
}

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todo_item_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="8dp"
    android:elevation="8dp"
    app:cardCornerRadius="5dp">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <CheckBox
            android:id="@+id/chx"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:text="todo item"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.0" />
    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.cardview.widget.CardView>

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activity_add_todo.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="25dp"
    tools:context=".AddOrEditToDoActivity">

    <EditText
        android:id="@+id/txtTitle"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        android:ems="10"
        android:hint="title"
        android:inputType="textPersonName"
        android:minHeight="48dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/txtDescription"
        android:layout_width="344dp"
        android:layout_height="205dp"
        android:layout_marginTop="44dp"
        android:ems="10"
        android:hint="description"
        android:inputType="textPersonName"
        android:minHeight="48dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtTitle" />

    <Button
        android:id="@+id/btnAdd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="108dp"
        android:text="add todo"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.526"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/txtDescription" />
</androidx.constraintlayout.widget.ConstraintLayout>
                  

                    MainActivity.kt:

import android.Manifest
import android.app.NotificationChannel
import android.app.NotificationManager
import android.content.Context
import android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import androidx.core.app.NotificationCompat

class MainActivity : AppCompatActivity() {

    private lateinit var button: Button

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        button = findViewById(R.id.button_send_notification)
        button.setOnClickListener {
            sendNotification()
        }
    }

    private fun sendNotification() {
        // Create a notification channel
        val channel = NotificationChannel(
            "my_channel",
            "My Notification Channel",
            NotificationManager.IMPORTANCE_DEFAULT
        )
        channel.description = "This is my notification channel"
        channel.setAllowBubbles(false)
        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager.createNotificationChannel(channel)

        // Request permission
        val permission = Manifest.permission.POST_NOTIFICATIONS
        val requestCode = 1
        requestPermissions(arrayOf(permission), requestCode)

        // Create notification
        val notificationBuilder = NotificationCompat.Builder(this, "my_channel")
            .setContentTitle("My Notification")
            .setContentText("This is my notification")
            .setSmallIcon(R.drawable.baseline_circle_notifications_24)

        // Send the notification
        val notificationManager1 = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager1.notify(1, notificationBuilder.build())
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)

        if (requestCode == 1 && grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            sendNotification()
        }
    }
}


____________________________________________________________________________________________

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button_send_notification"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:onClick="sendNotification"
        android:text="Send Notification"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
                  

                    MainActivity.kt:

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.TextView

class MainActivity : AppCompatActivity() {
    lateinit var edtProfit: EditText
    lateinit var edtDay: EditText
    lateinit var edtMoney: EditText
    lateinit var btnCalculate: Button
    lateinit var txt1: TextView
    lateinit var txt2:TextView
    lateinit var txt3:TextView
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        btnCalculateClick()
    }

    private fun btnCalculateClick() {
        setupView()
        btnCalculate!!.setOnClickListener {
            val profit = edtProfit!!.text.toString().toInt()
            val money = edtMoney!!.text.toString().toLong()
            val day = edtDay!!.text.toString().toInt()
            val a = money * profit * day / 36500
            txt1!!.text = "سود سالانه : $a ریال "
            val b = money * profit * day / 36500 / 365
            txt2!!.text = "سود روزانه : $b ریال "
            val c = money * profit * day / 36500 / 365 * 30
            txt3!!.text = "سود سی روزه : $c ریال "

        }
    }

    private fun setupView() {
        edtProfit = findViewById(R.id.sod)
        edtDay = findViewById(R.id.day)
        edtMoney = findViewById(R.id.money)
        btnCalculate = findViewById(R.id.submut)
        txt1 = findViewById(R.id.salane)
        txt2 = findViewById(R.id.rozane)
        txt3 = findViewById(R.id.thereday)
    }
}

_______________________________________________________________________________________

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/pic"
        android:layout_width="135dp"
        android:layout_height="136dp"
        android:layout_marginTop="56dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/pic"
        tools:ignore="ContentDescription,ImageContrastCheck" />

    <EditText
        android:id="@+id/money"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:autofillHints=""
        android:ems="10"
        android:fontFamily="@font/iran"
        android:hint="مبلغ را وارد نمایید"
        android:inputType="text"
        android:textColorHint="#A1887F"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.503"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/pic"
        tools:ignore="MissingConstraints" />

    <EditText
        android:id="@+id/sod"
        android:layout_width="142dp"
        android:layout_height="50dp"
        android:layout_marginTop="32dp"
        android:autofillHints=""
        android:ems="10"
        android:fontFamily="@font/iran"
        android:hint="درصد را وارد نمایید"
        android:inputType="text"
        android:textColorHint="#A1887F"
        app:layout_constraintBottom_toTopOf="@+id/submut"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.888"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/money"
        app:layout_constraintVertical_bias="0.212"
        tools:ignore="MissingConstraints" />

    <EditText
        android:id="@+id/day"
        android:layout_width="142dp"
        android:layout_height="50dp"
        android:layout_marginTop="32dp"
        android:autofillHints=""
        android:ems="10"
        android:fontFamily="@font/iran"
        android:hint="روز"
        android:inputType="text"
        android:textColorHint="#A1887F"
        app:layout_constraintBottom_toTopOf="@+id/submut"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.208"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/money"
        app:layout_constraintVertical_bias="0.212"
        tools:ignore="MissingConstraints" />

    <Button
        android:id="@+id/submut"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="244dp"
        android:fontFamily="@font/iran"
        android:text="محاسبه"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/rozane"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:fontFamily="@font/iran"
        android:text="سود روزانه:"
        android:textSize="20sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.865"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/submut" />

    <TextView
        android:id="@+id/thereday"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="92dp"
        android:fontFamily="@font/iran"
        android:text="سود 30 روزه:"
        android:textSize="20sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.865"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/submut" />

    <TextView
        android:id="@+id/salane"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="148dp"
        android:fontFamily="@font/iran"
        android:text="سود سالانه 365 روز:"
        android:textSize="20sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.831"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/submut" />

</androidx.constraintlayout.widget.ConstraintLayout>