Changing the mutable state does not change the value. This is a pretty basic use case that used to work with Model. Any help would be appreciated.

Unless I misunderstand what you're trying to achieve

I get a value change over bluetooth and want the new value displayed in a Text element.

This is ugly but works:

package com.nikolamotor.test

import android.os.Bundle
import android.os.Handler
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.foundation.Text
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.platform.setContent

import com.nikolamotor.test.ui.TestTheme

class MainActivity : AppCompatActivity() {

    class Data (
        count : Int = 0
    ) {
        var count = mutableStateOf(count)
    }

    var data = Data()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            TestTheme {
                Surface(color = MaterialTheme.colors.background) {
                    Greeting()
                }
            }
        }
        increment()
    }

    fun increment () {
        Handler(this.getMainLooper()).postDelayed({
            data.count.value++
            increment()
        }, 1000)
    }

    @Composable
    fun Greeting() {
        var data = remember { data }
        Text(text = "Hello ${data.count.value}!")
    }
    
}

Cleaner and also works:

package com.nikolamotor.test

import android.os.Bundle
import android.os.Handler
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.foundation.Text
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.platform.setContent

import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue

import com.nikolamotor.test.ui.TestTheme

class MainActivity : AppCompatActivity() {

    class Data <T> (
        count : T
    ) {
        var count by mutableStateOf(count)
    }

    var data = Data<Int>(0)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            TestTheme {
                Surface(color = MaterialTheme.colors.background) {
                    Greeting()
                }
            }
        }
        increment()
    }

    fun increment () {
        Handler(this.getMainLooper()).postDelayed({
            data.count++
            increment()
        }, 1000)
    }

    @Composable
    fun Greeting() {
        var data = remember { data }
        Text(text = "Hello ${data.count}!")
    }

}

It would be nice if there was a compiler check for remember such that it wraps something that is mutableStateOf. This definitely makes things trickier.

Here is what I am doing which doesn’t work:

@Composable

override fun view () { //var mDataModel = remember {dataModel} val drawerState = rememberBottomDrawerState(dataModel.drawerState) BottomDrawerLayout( drawerState = drawerState, gesturesEnabled = true, drawerContent = { drawerView() }, bodyContent = { baseView() } ) } Changing dataModel.drawerState to BottomDrawerValue.Open has no effect.