room database with mvvm

activity_profile.xml

<?xml version="1.0" encoding="utf-8"?>

<layout
    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"
    >

    <data>
        <variable
            name="viewModel"
            type="com.example.profilescreen.viewModel.UserDetailsViewModel"
            />

    </data>



<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".view.activity.ProfileActivity">


    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/topLayout"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:background="@color/ui_kit_rewards_gold_90"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@id/scrollView"
        >

        <androidx.appcompat.widget.AppCompatImageView
            android:layout_width="30dp"
            android:layout_height="146dp"
            android:src="@drawable/group_566"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            />

        <androidx.appcompat.widget.AppCompatImageView
            android:layout_width="41dp"
            android:layout_height="68dp"
            android:src="@drawable/group"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            />

        <androidx.appcompat.widget.AppCompatTextView
            android:id="@+id/p_information"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="50dp"
            android:text="@string/personal_info"
            android:fontFamily="sans-serif"
            android:textStyle="bold"
            android:textSize="14sp"
            android:textColor="@color/black"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            />



        <androidx.appcompat.widget.AppCompatImageView
            android:id="@+id/profile_image"
            android:layout_width="86dp"
            android:layout_height="86dp"
            android:layout_marginTop="41dp"
            android:src="@drawable/group_569"
            app:civ_border_width="2dp"
            app:civ_border_color="#FF000000"
            android:layout_marginStart="24dp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/p_Name"
            app:layout_constraintTop_toBottomOf="@id/p_information"
            />
        <androidx.appcompat.widget.AppCompatImageView
            android:layout_width="22dp"
            android:layout_height="22dp"
            android:src="@drawable/group_695"
            app:layout_constraintBottom_toBottomOf="@id/profile_image"
            app:layout_constraintStart_toStartOf="@id/profile_image"
            app:layout_constraintEnd_toEndOf="@id/profile_image"
            />

        <androidx.appcompat.widget.AppCompatTextView
            android:id="@+id/p_Name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="17dp"
            android:layout_marginStart="20dp"
            android:fontFamily="sans-serif"
            android:text="@string/profile_name"
            android:textColor="@color/greens_house_green"
            android:textSize="16sp"
            android:textStyle="bold"
            app:layout_constraintBottom_toTopOf="@id/p_rewards"
            app:layout_constraintStart_toEndOf="@id/profile_image"
            app:layout_constraintTop_toTopOf="@id/profile_image" />

        <TextView
            android:id="@+id/p_rewards"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:fontFamily="sans-serif"
            android:text="@string/gold_tier"
            android:textColor="@color/ui_kit_rewards_gold"
            android:textSize="18sp"
            android:textStyle="bold"
            app:layout_constraintStart_toStartOf="@id/p_Name"
            app:layout_constraintTop_toBottomOf="@id/p_Name"

            />





    </androidx.constraintlayout.widget.ConstraintLayout>


    <androidx.core.widget.NestedScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:fillViewport="true"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/topLayout">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/bottomLayout"
            android:layout_width="match_parent"
            android:layout_height="573dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/topLayout">

            <androidx.appcompat.widget.AppCompatTextView
                android:id="@+id/f_name_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="50dp"
                android:text="@string/first_name"
                android:textColor="@color/black"
                android:textSize="12sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.08"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <androidx.appcompat.widget.AppCompatEditText
                android:id="@+id/et_firstName"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginHorizontal="24dp"
                android:hint="@string/type"
                android:digits="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
                android:textSize="15sp"
                android:text="@={viewModel.firstName}"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="@id/f_name_text"
                app:layout_constraintTop_toBottomOf="@id/f_name_text" />

            <androidx.appcompat.widget.AppCompatTextView
                android:id="@+id/l_name_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="20dp"
                android:text="@string/last_name"
                android:textColor="@color/black"
                android:textSize="12sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.08"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/et_firstName" />

            <androidx.appcompat.widget.AppCompatEditText
                android:id="@+id/et_lastName"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginHorizontal="24dp"
                android:hint="@string/type"
                android:text="@={viewModel.lastName}"
                android:digits="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
                android:textSize="15sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="@id/l_name_text"
                app:layout_constraintTop_toBottomOf="@id/l_name_text" />



            <androidx.appcompat.widget.AppCompatTextView
                android:id="@+id/mobile_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="20dp"
                android:text="@string/mobile_number"
                android:textAllCaps="true"
                android:textColor="@color/black"
                android:textSize="12sp"
                app:layout_constraintStart_toStartOf="@id/et_Mobile"
                app:layout_constraintTop_toBottomOf="@id/et_lastName"
                />

            <androidx.appcompat.widget.AppCompatEditText
                android:id="@+id/et_Mobile"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginHorizontal="24dp"
                android:drawableEnd="@drawable/ui_24_edit_thick"
                android:hint="@string/type"
                android:inputType="phone"
                android:maxLength="10"
                android:text="@={viewModel.number}"
                android:textSize="15sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="@id/mobile_text"
                app:layout_constraintTop_toBottomOf="@id/mobile_text"
                />


            <androidx.appcompat.widget.AppCompatButton
                android:id="@+id/submitBtn"
                android:layout_width="match_parent"
                android:layout_height="40dp"
                android:layout_marginHorizontal="24dp"

                android:background="@drawable/button_round_shape"
                android:fontFamily="sans-serif"
                android:onClick="@{() -> viewModel.onClick()}"
                android:text="@string/submit"
                android:textAllCaps="false"
                android:textColor="@color/white"
                android:textSize="12sp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/et_Mobile" />

        </androidx.constraintlayout.widget.ConstraintLayout>

    </androidx.core.widget.NestedScrollView>


</androidx.constraintlayout.widget.ConstraintLayout>

</layout>

DataActivity.kt

package com.example.profilescreen.view.activity

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.databinding.DataBindingUtil
import com.example.profilescreen.R
import com.example.profilescreen.databinding.ActivityDataBinding

class DataActivity : AppCompatActivity() {
    lateinit var dataBinding:ActivityDataBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        dataBinding = DataBindingUtil.setContentView(this, R.layout.activity_data)


        val  bundle: Bundle = intent.extras!!

        if (bundle!=null) {
            val first = bundle.getString("1")
            val last = bundle.getString("2")
            val birth = bundle.getString("3")
            val phone = bundle.getString("4")
            val email = bundle.getString("5")

            dataBinding.firstName.text = first
            dataBinding.lastname.text = last
            dataBinding.birthDate.text = birth
            dataBinding.mobileNumber.text = phone
            dataBinding.emailId.text = email
        }


    }
}

ProfileActivity.kt

package com.example.profilescreen.view.activity

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.ViewModelProvider
import com.example.profilescreen.R
import com.example.profilescreen.databinding.ActivityProfileBinding
import com.example.profilescreen.viewModel.UserDetailsViewModel

class ProfileActivity : AppCompatActivity() {

    lateinit var binding: ActivityProfileBinding
    lateinit var userDetailsViewModel : UserDetailsViewModel


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_profile)

        userDetailsViewModel = ViewModelProvider(this).get(UserDetailsViewModel::class.java)

        binding.viewModel = userDetailsViewModel
        userDetailsViewModel.setContext(this)

    }
}

UserDetails.kt

package com.example.profilescreen.model.dataModel

import androidx.room.ColumnInfo
import androidx.room.Entity
import androidx.room.PrimaryKey

@Entity(tableName = "userData")
data class UserDetails(

    @PrimaryKey(autoGenerate = true)
    var userId : Int,
    @ColumnInfo(name = "firstname")
    val firstName: String,
    @ColumnInfo(name = "lastname")
    val lastName: String,
    @ColumnInfo(name = "number")
    val number: Long
    )

UserDetailsDao.kt

package com.example.profilescreen.model.room

import androidx.lifecycle.LiveData
import androidx.room.*
import com.example.profilescreen.model.dataModel.UserDetails

@Dao
interface UserDetailsDao {

    @Insert
    fun insertData(userDetails: UserDetails)

    @Update
    fun updateData(userDetails: UserDetails)

    @Delete
    fun deleteData(userDetails: UserDetails)


    @Query("Select * from userData")
    fun getAllData() : LiveData<UserDetails>

}

UserDetailsDatabase.kt

package com.example.profilescreen.model.room

import android.content.Context
import androidx.room.Database
import androidx.room.Room
import androidx.room.RoomDatabase
import com.example.profilescreen.model.dataModel.UserDetails


@Database(entities = [UserDetails::class], version = 1)
abstract class UserDetailsDatabase : RoomDatabase() {

    abstract fun userDao() : UserDetailsDao



    companion object{
        @Volatile
        private var INSTANCE : UserDetailsDatabase? = null

        fun getDatabase(context: Context): UserDetailsDatabase{

            if (INSTANCE == null){
                synchronized(this){
                  INSTANCE = Room.databaseBuilder(context.applicationContext,
                      UserDetailsDatabase::class.java, "UserDB")
                      .allowMainThreadQueries()
                      .build()
              }
            }
            return INSTANCE!!
        }

    }


}

UserDetailsViewModel.kt

package com.example.profilescreen.viewModel


import android.content.Context
import android.widget.Toast
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import com.example.profilescreen.model.dataModel.UserDetails
import com.example.profilescreen.model.room.UserDetailsDatabase



class UserDetailsViewModel() : ViewModel() {

    private var context: Context? = null
    var database = UserDetailsDatabase

    var firstName = MutableLiveData<String>("")
    var lastName = MutableLiveData<String>("")
    val number = MutableLiveData<String>("")

    fun setContext(myContext: Context) {
        this.context = myContext
    }

    fun onClick() {
        if (firstName.value.isNullOrEmpty() || lastName.value.isNullOrEmpty() || number.value.isNullOrEmpty()) {

            Toast.makeText(context, "Enter Above Values", Toast.LENGTH_SHORT).show()

        } else {
            val detail = UserDetails(0, firstName.value!!, lastName.value!!, number.value!!.toLong())
            database.getDatabase(context!!).userDao().insertData(detail)
        }
    }


}