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Draw a polygon

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Draw a vector polygon on a map.
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.

DrawPolygonActivity.kt
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package com.mapbox.maps.testapp.examples.linesandpolygons

import android.graphics.Color
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import androidx.core.graphics.drawable.toBitmap
import com.mapbox.geojson.Point
import com.mapbox.maps.Style
import com.mapbox.maps.dsl.cameraOptions
import com.mapbox.maps.extension.style.layers.generated.FillLayer
import com.mapbox.maps.extension.style.layers.generated.fillLayer
import com.mapbox.maps.extension.style.layers.generated.lineLayer
import com.mapbox.maps.extension.style.layers.getLayer
import com.mapbox.maps.extension.style.sources.generated.geoJsonSource
import com.mapbox.maps.extension.style.style
import com.mapbox.maps.testapp.R
import com.mapbox.maps.testapp.databinding.ActivityDdsDrawPolygonBinding

/**
 * Draw a vector polygon on a map with the Mapbox Android SDK.
 */
class DrawPolygonActivity : AppCompatActivity() {

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val binding = ActivityDdsDrawPolygonBinding.inflate(layoutInflater)
    setContentView(binding.root)
    binding.mapView.mapboxMap.setCamera(
      START_CAMERA_POSITION
    )
    binding.mapView.mapboxMap.loadStyle(
      style(style = Style.LIGHT) {
        +geoJsonSource(SOURCE_ID) {
          data(SOURCE_URL)
        }
        +layerAtPosition(
          fillLayer(LAYER_ID, SOURCE_ID) {
            fillColor(Color.parseColor("#0080ff")).fillOpacity(0.5)
          },
          below = SETTLEMENT_LABEL
        )
        +lineLayer(
          TOP_LAYER_ID, SOURCE_ID
        ) {
          lineColor(ContextCompat.getColor(this@DrawPolygonActivity, R.color.black))
          lineWidth(3.0)
        }
      }
    )
    binding.patternFab.setOnClickListener {
      binding.mapView.mapboxMap.getStyle { style ->
        val bitmap = ContextCompat.getDrawable(this@DrawPolygonActivity, R.drawable.pattern)
          ?.toBitmap(128, 128)!!
        style.addImage(IMAGE_ID, bitmap)
        val layer = style.getLayer(LAYER_ID) as FillLayer
        layer.fillPattern(IMAGE_ID)
        layer.fillOpacity(0.7)
      }
    }
  }

  companion object {
    private const val IMAGE_ID = "stripe-pattern"
    private const val LAYER_ID = "layer-id"
    private const val SOURCE_ID = "source-id"
    private const val TOP_LAYER_ID = "line-layer"
    private const val SETTLEMENT_LABEL = "settlement-major-label"
    private const val SOURCE_URL = "asset://maine_polygon.geojson"
    private val START_CAMERA_POSITION = cameraOptions {
      center(
        Point.fromLngLat(-68.137343, 45.137451)
      )
      zoom(5.0)
      bearing(0.0)
      pitch(0.0)
    }
  }
}
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