Amaliy ish №3,4 Topshirdi: Ustaboyev Abbosbek Qabul qildi: Jabborova N. Toshkent 022 Mavzu: Dasturiy mahsulotning backend qismi. Dastur kodi va screenshot: Bu ilova mvvm arhitekturasida qili Shopping Repository

}
}
}

}

endi fragmentlarimizda observe qilamiz
package mobiler.abbosbek.onlineshopping.screen

import android.content.Context

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.fragment.app.Fragment
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.get
import kotlinx.android.synthetic.main.activity_main.*
import mobiler.abbosbek.onlineshopping.R
import mobiler.abbosbek.onlineshopping.db.AppDataBase
import mobiler.abbosbek.onlineshopping.screen.CartScreen.CartFragment
import mobiler.abbosbek.onlineshopping.screen.FavoriteScreen.FavoriteFragment
import mobiler.abbosbek.onlineshopping.screen.HomeScreen.HomeFragment
import mobiler.abbosbek.onlineshopping.screen.ProfileScreen.ProfileFragment
import mobiler.abbosbek.onlineshopping.screen.changeLanguage.ChangLangFragment
import mobiler.abbosbek.onlineshopping.utils.LocaleManager

class MainActivity : AppCompatActivity() {

val homeFragment = HomeFragment.newInstance()
val favoriteFragment = FavoriteFragment.newInstance()
val cartFragment = CartFragment.newInstance()
val profileFragment = ProfileFragment.newInstance()

var activFragment : Fragment = homeFragment

lateinit var viewModel: MainViewModel

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

viewModel = ViewModelProvider(this).get(MainViewModel::class.java)

viewModel.productData.observe(this, Observer {
viewModel.insertAllProducts2DB(it)
homeFragment.loadData()
})

viewModel.error.observe(this,Observer{

Toast.makeText(this,it,Toast.LENGTH_SHORT).show()
})

supportFragmentManager.beginTransaction().add(R.id.flContainer,homeFragment,homeFragment.tag).hide(homeFragment).commit()
supportFragmentManager.beginTransaction().add(R.id.flContainer,favoriteFragment,favoriteFragment.tag).hide(favoriteFragment).commit()
supportFragmentManager.beginTransaction().add(R.id.flContainer,cartFragment,cartFragment.tag).hide(cartFragment).commit()
supportFragmentManager.beginTransaction().add(R.id.flContainer,profileFragment,profileFragment.tag).hide(profileFragment).commit()

supportFragmentManager.beginTransaction().show(activFragment).commit()

bottom_nav.setOnItemSelectedListener {

if(it.itemId==R.id.ActionHome){
supportFragmentManager.beginTransaction().hide(activFragment).show(homeFragment).commit()
activFragment = homeFragment
}else if (it.itemId == R.id.ActionFavorite){
supportFragmentManager.beginTransaction().hide(activFragment).show(favoriteFragment).commit()
activFragment = favoriteFragment
}else if (it.itemId == R.id.ActionCart){
supportFragmentManager.beginTransaction().hide(activFragment).show(cartFragment).commit()
activFragment = cartFragment
}else if (it.itemId == R.id.ActionProfile){
supportFragmentManager.beginTransaction().hide(activFragment).show(profileFragment).commit()
activFragment = profileFragment
}

true