FragmentReceiver.kt

package ru.otus.daggerhomework

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.annotation.ColorInt
import androidx.fragment.app.Fragment
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.launch
import javax.inject.Inject

class FragmentReceiver : Fragment() {

    @Inject
    lateinit var viewModelReceiver: ViewModelReceiver

    private lateinit var frame: View

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        injectDependencies()
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_b, container, true)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        frame = view.findViewById(R.id.frame)

        viewLifecycleOwner.lifecycleScope.launch {
            viewModelReceiver
                .colorsFlow
                .collect(this@FragmentReceiver::populateColor)
        }
    }

    private fun populateColor(@ColorInt color: Int) {
        frame.setBackgroundColor(color)
    }

    private fun injectDependencies() {
        val component = (activity as MainActivity)
            .activityComponent
            .provideFragmentReceiverComponentFactory()
            .create()

        component.inject(this)
    }
}