Wednesday, October 6, 2021

jetpack compose - Dismiss Snackbar programmatically

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.graphics.Color
import androidx.compose.material.Text
import androidx.compose.material.TopAppBar
import androidx.compose.material.icons.filled.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import kotlinx.coroutines.launch


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            GetScaffold()
        }
    }


    @Composable
    fun GetScaffold(){
        val scaffoldState: ScaffoldState = rememberScaffoldState(
            snackbarHostState = SnackbarHostState()
        )

        Scaffold(
            scaffoldState = scaffoldState,
            topBar = {
                TopAppBar(
                    title = { Text(
                        text = "Compose - Snackbar Dismiss In Code"
                    )},
                    backgroundColor = Color(0xFFC0E8D5),
                )
            },
            content = {MainContent(scaffoldState)},
            backgroundColor = Color(0xFFEDEAE0),
        )
    }


    @Composable
    fun MainContent(scaffoldState: ScaffoldState){
        val scope = rememberCoroutineScope()
        var snackBarStatus by remember {
            mutableStateOf("Snackbar status")
        }

        Box(
            modifier = Modifier.fillMaxSize(),
            contentAlignment = Alignment.Center
        ){
            Column(
                verticalArrangement = Arrangement.spacedBy(24.dp),
                horizontalAlignment = Alignment.CenterHorizontally
            ) {
                Text(
                    text = snackBarStatus,
                    style = MaterialTheme.typography.h5
                )

                Button(onClick = {
                    scope.launch{
                        scaffoldState
                            .snackbarHostState.showSnackbar(
                                message = "This is an indefinite Snackbar",
                                duration = SnackbarDuration.Indefinite
                            ).let {
                                when(it){
                                    SnackbarResult.Dismissed -> {
                                        snackBarStatus = "Snackbar dismissed"
                                    }
                                }
                            }
                    }
                }) {
                    Text(text = "Show Snackbar")
                }

                Button(onClick = {
                    scaffoldState.snackbarHostState
                        .currentSnackbarData?.dismiss()
                }) {
                    Text(text = "Dismiss Snackbar")
                }
            }
        }
    }
}