RootActivity.kt

package com.example.secondtry

import android.os.Bundle
import android.view.LayoutInflater
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.ui.platform.setContent
import androidx.lifecycle.Observer
import org.koin.android.viewmodel.ext.android.viewModel
import kotlin.time.ExperimentalTime

class WallpostsActivity : AppCompatActivity() {

    private val viewModel: MainViewModel by viewModel()

    @ExperimentalTime
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val step = intent.getLongExtra("STEP_SIZE", 128L)

        viewModel.stepCount = step
        viewModel.getWallposts()

        val observer = Observer<ArrayList<Wallpost>> { list ->
            setWallpostsView()
        }

        viewModel.liveWallposts.observe(this, observer)

        val loadingView = LayoutInflater.from(this).inflate(R.layout.loading, null)
        setContentView(loadingView)

    }

    @ExperimentalTime
    override fun onResume() {
        super.onResume()
        if (viewModel.liveWallposts.value != null) {
            setWallpostsView()
        }
    }

    @ExperimentalTime
    private fun setWallpostsView() {
        setContent {
            WallpostsList(viewModel.liveWallposts.value!!)
        }
    }
}