ToDo App with Database

ToDoDBApp

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")
      }

  }
  
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  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>