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How to Draw Track on Google Maps in Android using Jetpack Compose?

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In many android apps, we have seen that there is a route marker from a source location to the destination location. In this article, we will take a look at How we can draw a track on Google Maps in Android using Jetpack Compose. 

Step By Step Implementation

Step 1: Create a New Project in Android Studio

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. While choosing the template, select Empty Compose Activity. If you do not find this template, try upgrading the Android Studio to the latest version. We demonstrated the application in Kotlin, so make sure you select Kotlin as the primary language while creating a New Project.

Step 2: Adding a new color to the Color.kt file

Navigate to app > java > your app’s package name > ui.theme > Color.kt file and add the below code to it. 

Kotlin




import androidx.compose.ui.graphics.Color
 
val Purple200 = Color(0xFF0F9D58)
val Purple500 = Color(0xFF0F9D58)
val Purple700 = Color(0xFF3700B3)
val Teal200 = Color(0xFF03DAC5)
 
// on below line we are adding different colors.
val greenColor = Color(0xFF0F9D58)


Step 3: Working with the MainActivity.kt file

Go to the MainActivity.kt file and refer to the following code. Below is the code for the MainActivity.kt file. Comments are added inside the code to understand the code in more detail.

Kotlin




import android.content.ActivityNotFoundException
import android.content.Context
import android.content.Intent
import android.net.Uri
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
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.platform.LocalContext
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.core.content.ContextCompat.startActivity
import com.example.newcanaryproject.ui.theme.NewCanaryProjectTheme
import com.example.newcanaryproject.ui.theme.greenColor
 
class MainActivity : ComponentActivity() {
 
    var message = ""
    override fun onCreate(savedInstanceState: Bundle?) {
 
        super.onCreate(savedInstanceState)
        setContent {
            NewCanaryProjectTheme {
                // on below line we are specifying background color for our application
                Surface(
                    // on below line we are specifying modifier and color for our app
                    modifier = Modifier.fillMaxSize(), color = MaterialTheme.colors.background
                ) {
                    // on the below line we are specifying the theme as the scaffold.
                    Scaffold(
                        // in scaffold we are specifying the top bar.
                        topBar = {
                            // inside top bar we are specifying background color.
                            TopAppBar(backgroundColor = greenColor,
                                // along with that we are specifying title for our top bar.
                                title = {
                                    // in the top bar we are specifying tile as a text
                                    Text(
                                        // on below line we are specifying
                                        // text to display in top app bar.
                                        text = "GFG",
                                        // on below line we are specifying
                                        // modifier to fill max width.
                                        modifier = Modifier.fillMaxWidth(),
                                        // on below line we are specifying
                                        // text alignment.
                                        textAlign = TextAlign.Center,
                                        // on below line we are specifying
                                        // color for our text.
                                        color = Color.White
                                    )
                                })
                        }) {
                        mapUI(LocalContext.current)
                        // on below line we are calling method to display UI
                    }
                }
            }
        }
    }
}
 
@Composable
fun mapUI(context: Context) {
    // on below line we are creating variable for source and destination location
    val sourceLocation = remember {
        mutableStateOf("")
    }
    val destinationLocation = remember {
        mutableStateOf("")
    }
    // on below line creating a variable for location.
    // on below line creating a column for our maps.
    Column(
        modifier = Modifier
            .fillMaxHeight()
            .fillMaxWidth()
            .background(Color.White)
    ) {
        // on below line we are adding a spacer.
        Spacer(modifier = Modifier.height(20.dp))
        // on below line we are adding a text
        Text(
            text = "Draw Route on Google Maps in Android",
            textAlign = TextAlign.Center,
            color = greenColor,
            fontWeight = FontWeight.Bold,
            modifier = Modifier
                .padding(10.dp)
                .fillMaxWidth()
        )
        // on below line we are creating a text field for our message number.
        TextField(
            // on below line we are specifying value for our message text field.
            value = sourceLocation.value,
            // on below line we are adding on value change for text field.
            onValueChange = { sourceLocation.value = it },
            // on below line we are adding place holder as text as "Enter your email"
            placeholder = { Text(text = "Enter your start location") },
            // on below line we are adding modifier to it and adding padding to it and filling max width
            modifier = Modifier.padding(15.dp).fillMaxWidth(),
            // on below line we are adding text style specifying color and font size to it.
            textStyle = TextStyle(color = Color.Black, fontSize = 15.sp),
            //on below line we are adding single line to it.
            singleLine = true,
        )
 
        // on below line we are adding a spacer.
        Spacer(modifier = Modifier.height(10.dp))
 
        // on below line we are adding a text field to add destination location.
        // on below line we are creating a text field for our message number.
        TextField(
            // on below line we are specifying value for our message text field.
            value = destinationLocation.value,
            // on below line we are adding on value change for text field.
            onValueChange = { destinationLocation.value = it },
            // on below line we are adding place holder as text as "Enter your email"
            placeholder = { Text(text = "Enter your destination location") },
            // on below line we are adding modifier to it and adding padding to it and filling max width
            modifier = Modifier.padding(15.dp).fillMaxWidth(),
            // on below line we are adding text style specifying color and font size to it.
            textStyle = TextStyle(color = Color.Black, fontSize = 15.sp),
            //on below line we are adding single line to it.
            singleLine = true,
        )
 
        // on below line we are adding a spacer.
        Spacer(modifier = Modifier.height(20.dp))
 
        // on below line adding a button.
        Button(
            onClick = {
                drawTrack(sourceLocation.value, destinationLocation.value, context)
            },
            // on below line adding a modifier for our button.
            modifier = Modifier.padding(10.dp).fillMaxWidth()
        ) {
            // on below line we are adding a text
            Text(
                text = "Draw Route on Google Maps",
                color = Color.White,
                textAlign = TextAlign.Center
            )
        }
    }
}
 
private fun drawTrack(source: String, destination: String, context: Context) {
    try {
        // create a uri
        val uri: Uri = Uri.parse("https://www.google.co.in/maps/dir/$source/$destination")
        // initializing a intent with action view.
        val i = Intent(Intent.ACTION_VIEW, uri)
        // below line is to set maps package name
        i.setPackage("com.google.android.apps.maps")
        // below line is to set flags
        i.flags = Intent.FLAG_ACTIVITY_NEW_TASK
        // start activity
        context.startActivity(i)
    } catch (e: ActivityNotFoundException) {
        // when the google maps is not installed on users device
        // we will redirect our user to google play to download google maps.
        // initializing intent with action view.
        val i = Intent(Intent.ACTION_VIEW, uri)
        // set flags
        i.flags = Intent.FLAG_ACTIVITY_NEW_TASK
        // to start activity
        context.startActivity(i)
    }
}


Output:



Last Updated : 23 Jan, 2023
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