Tuesday, March 2, 2021

jetpack compose - Handle changes in a TextField

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.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.material.*
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.input.KeyboardType
import androidx.compose.ui.text.input.TextFieldValue
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

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

        setContent {
            MainContent()
        }
    }


    @Composable
    fun MainContent(){
        Column(Modifier.padding(25.dp)) {
            val textState = remember { mutableStateOf(TextFieldValue())}

            TextField(
                value = textState.value,
                onValueChange = { textState.value = it },
                label = { Text(text = "Enter Country") },
                keyboardOptions = KeyboardOptions(
                    keyboardType = KeyboardType.Text
                ),
                textStyle = TextStyle(
                    fontFamily = FontFamily.Monospace,
                    fontWeight = FontWeight.Bold,
                    fontSize = 25.sp,
                    fontStyle = FontStyle.Normal
                )
            )

            Text(
                text = "You entered : ${textState.value.text}",
                fontSize = 22.sp,
                color = Color.Blue,
                fontFamily = FontFamily.SansSerif,
                fontStyle = FontStyle.Italic,
                modifier = Modifier.padding(top = 25.dp)
            )
        }
    }


    @Preview
    @Composable
    fun ComposablePreview(){
        //MainContent()
    }
}