Button in Android using Jetpack Compose
Jetpack Compose is a new toolkit provided by Google. This is useful for designing beautiful UI designs. A Button is a UI component in Android which is used to navigate between different screens. With the help of a button, the user can interact with your app and perform multiple actions inside your application. In this article, we will take a look at the implementation of buttons in Android using Jetpack compose.
Attributes of the Button Widget
Attribute | Description |
---|---|
onClick | To perform an action when your button is clicked by the user. |
modifier | this parameter is used to add padding to our button. |
enabled | to enable or disable your button. |
border | this parameter is used to add border stroke to our button. |
shape | this parameter is used to add shape to our button. |
Text() | this parameter will be used to add text which is to be displayed on your button. |
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.BorderStroke import androidx.compose.foundation.Image import androidx.compose.foundation.Text import androidx.compose.foundation.layout.* import androidx.compose.foundation.shape.RoundedCornerShape import androidx.compose.foundation.text.KeyboardOptions import androidx.compose.material.* 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.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.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 { GFGAppTheme { // A surface container using the 'background' // color from the theme Surface(color = MaterialTheme.colors.background) { // at below line we are calling // our function for button. MyButton(); } } } } } // @Preview function is use to see preview // for our composable function in preview section. @Preview (showBackground = true ) @Composable fun DefaultPreview() { GFGAppTheme { // we are passing our composable // function to display its preview. MyButton(); } } @Composable fun MyButton() { Column( // we are using column to align our // imageview to center of the screen. modifier = Modifier.fillMaxWidth().fillMaxHeight(), // below line is used for specifying // vertical arrangement. verticalArrangement = Arrangement.Center, // below line is used for specifying // horizontal arrangement. horizontalAlignment = Alignment.CenterHorizontally, ) { // below line is use to get // the context for our app. val context = ContextAmbient.current // below line is use to create a button. Button( // below line is use to add onclick // parameter for our button onclick onClick = { // when user is clicking the button // we are displaying a toast message. Toast.makeText(context, "Welcome to Geeks for Geeks" , Toast.LENGTH_LONG).show() }, // in below line we are using modifier // which is use to add padding to our button modifier = Modifier.padding(all = Dp(10F)), // below line is use to set or // button as enable or disable. enabled = true , // below line is use to // add border to our button. border = BorderStroke(width = 1 .dp, brush = SolidColor(Color.Blue)), // below line is use to add shape for our button. shape = MaterialTheme.shapes.medium, ) // below line is use to // add text on our button { Text(text = "Geeks for Geeks" , color = Color.White) } } } |
Output: