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Use style imports

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Showcase adding style imports in runtime.
Android Examples App Available

This example code is part of the Maps SDK for Android Examples App, a working Android project available on GitHub. Android developers are encouraged to run the examples app locally to interact with this example in an emulator and explore other features of the Maps SDK.

See our Run the Maps SDK for Android Examples App tutorial for step-by-step instructions.

StyleImportsActivity.kt
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package com.mapbox.maps.compose.testapp.examples.style

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.FloatingActionButton
import androidx.compose.material.Text
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import com.mapbox.bindgen.Value
import com.mapbox.maps.Style
import com.mapbox.maps.compose.testapp.ExampleScaffold
import com.mapbox.maps.compose.testapp.examples.utils.CityLocations
import com.mapbox.maps.compose.testapp.ui.theme.MapboxMapComposeTheme
import com.mapbox.maps.extension.compose.MapboxMap
import com.mapbox.maps.extension.compose.animation.viewport.rememberMapViewportState
import com.mapbox.maps.extension.compose.style.ColorValue
import com.mapbox.maps.extension.compose.style.DoubleValue
import com.mapbox.maps.extension.compose.style.GenericStyle
import com.mapbox.maps.extension.compose.style.importConfigs
import com.mapbox.maps.extension.compose.style.layers.generated.BackgroundLayer
import com.mapbox.maps.extension.compose.style.slotsContent

/**
 * Example to showcase usage of style imports.
 */
public class StyleImportsActivity : ComponentActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContent {
      var showSatelliteImport by remember {
        mutableStateOf(true)
      }
      var showStandardImport by remember {
        mutableStateOf(true)
      }
      var showBackgroundLayer by remember {
        mutableStateOf(true)
      }
      MapboxMapComposeTheme {
        ExampleScaffold(
          floatingActionButton = {
            Column {
              FloatingActionButton(
                modifier = Modifier.padding(bottom = 10.dp),
                onClick = {
                  showStandardImport = !showStandardImport
                },
                shape = RoundedCornerShape(16.dp),
              ) {
                Text(
                  modifier = Modifier.padding(10.dp),
                  text = "Toggle standard import to ${if (showStandardImport) "disabled" else "enabled"}"
                )
              }
              FloatingActionButton(
                modifier = Modifier.padding(bottom = 10.dp),
                onClick = {
                  showSatelliteImport = !showSatelliteImport
                },
                shape = RoundedCornerShape(16.dp),
              ) {
                Text(
                  modifier = Modifier.padding(10.dp),
                  text = "Toggle satellite import to ${if (showSatelliteImport) "disabled" else "enabled"}"
                )
              }
              FloatingActionButton(
                modifier = Modifier.padding(bottom = 10.dp),
                onClick = {
                  showBackgroundLayer = !showBackgroundLayer
                },
                shape = RoundedCornerShape(16.dp),
              ) {
                Text(
                  modifier = Modifier.padding(10.dp),
                  text = "Toggle background layer at top slot to ${if (showBackgroundLayer) "disabled" else "enabled"}"
                )
              }
            }
          }
        ) {
          MapboxMap(
            Modifier.fillMaxSize(),
            mapViewportState = rememberMapViewportState {
              setCameraOptions {
                zoom(ZOOM)
                center(CityLocations.HELSINKI)
              }
            },
            style = {
              GenericStyle(
                /*
                 * Load the map with an empty style.
                 * The map will use `StyleImport`s to load the desired styles.
                 */
                style = "",
                styleImportsContent = {
                  if (showStandardImport) {
                    StyleImport(
                      importId = STANDARD_STYLE_IMPORT_ID,
                      style = Style.STANDARD,
                      configs = importConfigs {
                        config("showTransitLabels", Value(false))
                      }
                    )
                  }
                  if (showSatelliteImport) {
                    StyleImport(
                      importId = SATELLITE_STYLE_IMPORT_ID,
                      style = Style.SATELLITE
                    )
                  }
                },
                slotsContent {
                  slot("top") {
                    if (showBackgroundLayer) {
                      BackgroundLayer {
                        backgroundColor = ColorValue(Color.Red)
                        backgroundOpacity = DoubleValue(0.5)
                      }
                    }
                  }
                }
              )
            }
          )
        }
      }
    }
  }

  private companion object {
    const val ZOOM: Double = 9.0
    const val STANDARD_STYLE_IMPORT_ID = "standard"
    const val SATELLITE_STYLE_IMPORT_ID = "satellite"
  }
}
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