Wednesday, October 6, 2021

jetpack compose - Snackbar action

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
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 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 Action")},
                    backgroundColor = Color(0xFFC0E8D5),
                )
            },
            content = {MainContent(scaffoldState)},
            backgroundColor = Color(0xFFEDEAE0),
        )
    }


    @Composable
    fun MainContent(scaffoldState: ScaffoldState){
        val scope = rememberCoroutineScope()
        var bgColor by remember { mutableStateOf(Color(0XFFF4C2C2))}

        Box(
            modifier = Modifier.fillMaxSize().background(bgColor),
            contentAlignment = Alignment.Center
        ){
            Button(onClick = {
                scope.launch{
                    val snackbarResult = scaffoldState
                        .snackbarHostState.showSnackbar(
                            message = "Change app background",
                            actionLabel = "Apply Green"
                        )

                    when(snackbarResult){
                        SnackbarResult.ActionPerformed -> {
                            bgColor = Color(0xFF7BB661)
                        }
                    }
                }
            }) {
                Text(text = "Show Snackbar")
            }
        }
    }
}