LegacyActivityInternal.kt

package com.leonidivankin.draftandroid.articles.refactoring

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.ComposeView
import androidx.compose.ui.unit.dp
import com.leonidivankin.draftandroid.R

class LegacyActivityInternal : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        title = "LegacyActivity, internal"
        setContentView(R.layout.external_part)
        findViewById<ComposeView>(R.id.composeViewInternalPart).setContent {
            InternalPart()
        }
    }
}

@Composable
private fun InternalPart() {
    Box(
        Modifier
            .fillMaxSize()
            .background(color = Color(0xFF4CAF50))
            .padding(32.dp)
    ) {
        Box(
            Modifier
                .fillMaxSize()
                .background(color = Color(0xFFFF9800))
                .padding(32.dp)
        )
    }
}