A checkbox is considered as a useful UI element through which users can select multiple options by just checking and unchecking. Let’s learn how to add a checkbox in Android using Jetpack Compose.
Jetpack Compose has a dedicated compose named Checkbox for this purpose. Using remember and mutableStateOf we can manage the check state. See the code snippet given below.
@Composable
fun CheckboxExample() {
val checkedState = remember { mutableStateOf(true) }
Checkbox(
checked = checkedState.value,
onCheckedChange = { checkedState.value = it },
colors = CheckboxDefaults.colors(Color.Red)
)
}The checkedState variable holds the boolean value that whether the Checkbox is checked or not. Through onCheckedChange the variable is updated with the current state of the Checkbox. I also choose red as the Checkbox color.
Following is the complete code for reference.
package com.example.myapplication
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
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.tooling.preview.Preview
import com.example.myapplication.ui.theme.MyApplicationTheme
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
MyApplicationTheme {
Surface(
color = MaterialTheme.colors.background,
modifier = Modifier.fillMaxWidth().fillMaxHeight()
) {
CheckboxExample()
}
}
}
}
}
@Composable
fun CheckboxExample() {
val checkedState = remember { mutableStateOf(true) }
Checkbox(
checked = checkedState.value,
onCheckedChange = { checkedState.value = it },
colors = CheckboxDefaults.colors(Color.Red)
)
}
@Preview(showBackground = true)
@Composable
fun DefaultPreview() {
MyApplicationTheme {
CheckboxExample()
}
}For more information about Checkbox, you may go to the official documentation.
