AlertDialog in Android using Jetpack Compose
AlertDialog shows the Alert message and gives the answer in the form of yes or no. Alert Dialog displays the message to warn you and then according to your response, the next step is processed. Android Alert Dialog is built with the use of three fields: Title, Message area, Action Button.
We have seen AlertDialog in many of the apps, this is used to display a kind of message to our users. In this article, we will see the implementation of Alert Dialog in Android using Jetpack Compose.
Attributes of AlertDialog
Attributes |
Description |
---|---|
onDismissRequest | to check if the alert dialog is open or not. |
title | to add title in our alert dialog. |
text | to add a text description to our Alert Dialog. |
confirmButton | to set a button for confirmation in Alert Dialog. |
dismissButton | to set a dismiss dialog button in Alert Dialog. |
backgroundColor | to set a background color of an alert dialog. |
contentColor | to set a color for our content of Alert Dialog. |
Step by Step Implementation
Step 1: Create a New Project
To create a new project in the Android Studio Canary Version please refer to How to Create a new Project in Android Studio Canary Version with Jetpack Compose.
Step 2: Working with the MainActivity.kt file
Navigate to the app > java > your app’s package name and open the MainActivity.kt file. Inside that file add the below code to it. Comments are added inside the code to understand the code in more detail.
Kotlin
import android.graphics.drawable.shapes.Shape import android.media.Image import android.os.Bundle import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import androidx.compose.foundation.* import androidx.compose.foundation.Text import androidx.compose.foundation.layout.* import androidx.compose.foundation.shape.CircleShape import androidx.compose.foundation.shape.RoundedCornerShape import androidx.compose.foundation.text.KeyboardOptions import androidx.compose.material.* import androidx.compose.material.Icon import androidx.compose.material.icons.Icons import androidx.compose.material.icons.filled.AccountCircle import androidx.compose.material.icons.filled.Info import androidx.compose.material.icons.filled.Menu import androidx.compose.material.icons.filled.Phone import androidx.compose.runtime.* import androidx.compose.runtime.savedinstancestate.savedInstanceState import androidx.compose.ui.Alignment import androidx.compose.ui.layout.ContentScale import androidx.compose.ui.platform.setContent import androidx.compose.ui.res.imageResource import androidx.compose.ui.tooling.preview.Preview import androidx.compose.ui.unit.dp import com.example.gfgapp.ui.GFGAppTheme import androidx.compose.ui.Modifier import androidx.compose.ui.draw.clip import androidx.compose.ui.graphics.Color import androidx.compose.ui.graphics.SolidColor import androidx.compose.ui.platform.ContextAmbient import androidx.compose.ui.platform.testTag import androidx.compose.ui.res.colorResource import androidx.compose.ui.text.TextStyle import androidx.compose.ui.text.font.FontFamily import androidx.compose.ui.text.input.* import androidx.compose.ui.unit.Dp import androidx.compose.ui.unit.TextUnit class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super .onCreate(savedInstanceState) setContent { ScrollableColumn { // A surface container using the // 'background' color from the theme Surface(color = MaterialTheme.colors.background) { // at below line we are calling our // function for alert dialog. AlertDialogComponent(); } } } } } @Preview (showBackground = true ) @Composable fun DefaultPreview() { GFGAppTheme { AlertDialogComponent(); } } @Composable fun AlertDialogComponent() { // below line is use to get // the context for our app. val context = ContextAmbient.current // below line is use to set our state // of dialog box to open as true. val openDialog = remember { mutableStateOf( true ) } // below line is to check if the // dialog box is open or not. if (openDialog.value) { // below line is use to // display a alert dialog. AlertDialog( // on dialog dismiss we are setting // our dialog value to false. onDismissRequest = { openDialog.value = false }, // below line is use to display title of our dialog // box and we are setting text color to white. title = { Text(text = "Beginner for Beginner" , color = Color.White) }, // below line is use to display // description to our alert dialog. text = { Text( "Hello! This is our Alert Dialog.." , color = Color.White) }, // in below line we are displaying // our confirm button. confirmButton = { // below line we are adding on click // listener for our confirm button. TextButton( onClick = { openDialog.value = false Toast.makeText(context, "Confirm Button Click" , Toast.LENGTH_LONG).show() } ) { // in this line we are adding // text for our confirm button. Text( "Confirm" , color = Color.White) } }, // in below line we are displaying // our dismiss button. dismissButton = { // in below line we are displaying // our text button TextButton( // adding on click listener for this button onClick = { openDialog.value = false Toast.makeText(context, "Dismiss Button Click" , Toast.LENGTH_LONG).show() } ) { // adding text to our button. Text( "Dismiss" , color = Color.White) } }, // below line is use to add background color to our alert dialog backgroundColor = colorResource(id = R.color.teal_200), // below line is use to add content color for our alert dialog. contentColor = Color.White ) } } |
Now run your app and see the output of the app:
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