MainActivity.kt
package com.cfsuman.composestate
import android.os.Bundle
import android.text.format.DateFormat
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material.*
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.unit.sp
import com.cfsuman.composestate.ui.theme.ComposeStateTheme
import kotlinx.coroutines.delay
import kotlinx.coroutines.flow.flow
import java.util.*
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
ComposeStateTheme {
Scaffold(
topBar = { TopAppBar(
title = { Text(text = "Compose - Flow Current Time")}
) },
content = { MainContent() },
backgroundColor = Color(0xFFEDEAE0)
)
}
}
}
}
@Composable
fun MainContent() {
fun getTime():String{
return DateFormat.format("hh:mm:ss",
Date(System.currentTimeMillis())).toString()
}
val timerFlow = flow<String> {
delay(1000)
emit(getTime())
}
val currentTime by timerFlow
.collectAsState(initial = getTime())
Box(
Modifier.fillMaxSize(),
contentAlignment = Alignment.Center
) {
Text(
text = currentTime,
style = TextStyle(fontSize = 40.sp)
)
}
}
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