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: