package
com.geeksforgeeks.jctextfieldmaxlength
import
android.os.Bundle
import
android.widget.Toast
import
androidx.activity.ComponentActivity
import
androidx.activity.compose.setContent
import
androidx.compose.foundation.layout.Arrangement
import
androidx.compose.foundation.layout.Column
import
androidx.compose.foundation.layout.fillMaxSize
import
androidx.compose.material.*
import
androidx.compose.runtime.*
import
androidx.compose.ui.Alignment
import
androidx.compose.ui.Modifier
import
androidx.compose.ui.graphics.Color
import
androidx.compose.ui.platform.LocalContext
import
androidx.compose.ui.text.input.TextFieldValue
import
androidx.compose.ui.tooling.preview.Preview
import
com.geeksforgeeks.jctextfieldmaxlength.ui.theme.JCTextFieldMaxLengthTheme
class
MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super
.onCreate(savedInstanceState)
setContent {
MainContent()
}
}
}
@Composable
fun MainContent() {
Scaffold(
topBar = { TopAppBar(title = { Text(
"GFG | TextField Max Length"
, color = Color.White) }, backgroundColor = Color(
0xff0f9d58
)) },
content = { MyContent() }
)
}
@Composable
fun MyContent(){
var mText by remember { mutableStateOf(TextFieldValue(
""
)) }
val mMaxLength =
5
val mContext = LocalContext.current
Column(Modifier.fillMaxSize(), horizontalAlignment = Alignment.CenterHorizontally, verticalArrangement = Arrangement.Center) {
TextField(
singleLine =
true
,
value = mText,
onValueChange = {
if
(it.text.length <= mMaxLength) mText = it
else
Toast.makeText(mContext,
"Cannot be more than 5 Characters"
, Toast.LENGTH_SHORT).show()
}
)
}
}
@Preview
(showBackground =
true
)
@Composable
fun DefaultPreview() {
MainContent()
}