Triangle Custom Layer | Maps SDK | Android Docs

Triangle Custom Layer Example.

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.

Kotlin

TriangleCustomLayerActivity.kt

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package com.mapbox.maps.testapp.examples.customlayer

import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import androidx.appcompat.app.AppCompatActivity
import com.mapbox.geojson.Point
import com.mapbox.maps.*
import com.mapbox.maps.extension.style.layers.CustomLayer
import com.mapbox.maps.extension.style.layers.addLayerBelow
import com.mapbox.maps.extension.style.layers.customLayer
import com.mapbox.maps.extension.style.layers.properties.generated.ProjectionName
import com.mapbox.maps.extension.style.projection.generated.projection
import com.mapbox.maps.extension.style.style
import com.mapbox.maps.testapp.R
import com.mapbox.maps.testapp.databinding.ActivityCustomLayerBinding

/**
 * Test activity showcasing the Custom Layer API
 */
class TriangleCustomLayerActivity : AppCompatActivity() {
  private lateinit var mapboxMap: MapboxMap
  private lateinit var binding: ActivityCustomLayerBinding

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityCustomLayerBinding.inflate(layoutInflater)
    setContentView(binding.root)
    mapboxMap = binding.mapView.mapboxMap
    mapboxMap.loadStyle(
      style(Style.MAPBOX_STREETS) {
        +layerAtPosition(
          customLayer(
            layerId = CUSTOM_LAYER_ID,
            host = TriangleCustomLayer()
          ),
          below = "building"
        )
        // triangle is floating when using default ProjectionName.GLOBE
        +projection(ProjectionName.MERCATOR)
      }
    ) {
      mapboxMap.setCamera(CAMERA)
      initFab()
    }
  }

  private fun addCustomLayer(style: Style) {
    style.addLayerBelow(
      CustomLayer(CUSTOM_LAYER_ID, TriangleCustomLayer()),
      below = "building"
    )
    binding.fab.setImageResource(R.drawable.ic_layers_clear)
  }

  private fun initFab() {
    binding.fab.setOnClickListener {
      swapCustomLayer()
    }
  }

  private fun swapCustomLayer() {
    mapboxMap.style?.let { style ->
      if (style.styleLayerExists(CUSTOM_LAYER_ID)) {
        style.removeStyleLayer(CUSTOM_LAYER_ID)
        binding.fab.setImageResource(R.drawable.ic_layers)
      } else {
        addCustomLayer(style)
      }
    }
  }

  private fun updateLayer() {
    mapboxMap.triggerRepaint()
  }

  override fun onCreateOptionsMenu(menu: Menu): Boolean {
    menuInflater.inflate(R.menu.menu_custom_layer, menu)
    return true
  }

  override fun onOptionsItemSelected(item: MenuItem): Boolean {
    return when (item.itemId) {
      R.id.action_update_layer -> {
        updateLayer()
        true
      }

      R.id.action_set_color_red -> {
        TriangleCustomLayer.color = floatArrayOf(
          1.0f, 0.0f, 0.0f, 0.5f,
          0.0f, 1.0f, 0.0f, 0.5f,
          0.0f, 0.0f, 1.0f, 0.5f,
        )
        true
      }

      R.id.action_set_color_green -> {
        TriangleCustomLayer.color = floatArrayOf(
          0.0f, 1.0f, 0.0f, 0.5f,
          0.0f, 0.0f, 1.0f, 0.5f,
          1.0f, 0.0f, 0.0f, 0.5f,
        )
        true
      }

      R.id.action_set_color_blue -> {
        TriangleCustomLayer.color = floatArrayOf(
          0.0f, 0.0f, 1.0f, 0.5f,
          1.0f, 0.0f, 0.0f, 0.5f,
          0.0f, 1.0f, 0.0f, 0.5f,
        )
        true
      }

      else -> super.onOptionsItemSelected(item)
    }
  }

  companion object {
    private const val CUSTOM_LAYER_ID = "customId"
    private val CAMERA =
      CameraOptions.Builder().center(Point.fromLngLat(20.0, 58.0)).pitch(0.0).zoom(3.0).build()
  }
}

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