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Tint a fill layer

Additional Developer Resources
Add an image to a style and use it to display a pattern in the landuse FillLayer in the Mapbox Streets style.
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.

TintFillPatternActivity.kt
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package com.mapbox.maps.testapp.examples

import android.graphics.*
import android.os.Bundle
import androidx.annotation.ColorInt
import androidx.appcompat.app.AppCompatActivity
import com.mapbox.maps.Style
import com.mapbox.maps.extension.style.expressions.dsl.generated.eq
import com.mapbox.maps.extension.style.expressions.dsl.generated.literal
import com.mapbox.maps.extension.style.expressions.dsl.generated.zoom
import com.mapbox.maps.extension.style.expressions.generated.Expression.Companion.linearInterpolator
import com.mapbox.maps.extension.style.image.image
import com.mapbox.maps.extension.style.layers.generated.fillLayer
import com.mapbox.maps.extension.style.style
import com.mapbox.maps.testapp.R
import com.mapbox.maps.testapp.databinding.ActivityRtsFillPatternTintBinding

/**
 * Add an image to a style and use it to display a pattern in the landuse
 * FillLayer in the Mapbox Streets style.
 */
class TintFillPatternActivity : AppCompatActivity() {

  private lateinit var initialBitmap: Bitmap

  public override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val binding = ActivityRtsFillPatternTintBinding.inflate(layoutInflater)
    setContentView(binding.root)

    initialBitmap = BitmapFactory.decodeResource(resources, R.drawable.fill_pattern)

    binding.fabPaint.setOnClickListener {
      binding.mapView.mapboxMap.style?.apply {
        addImage(FILL_PATTERN_ID, changeBitmapColor(initialBitmap, randomColor()))
      }
    }

    binding.mapView.mapboxMap.loadStyle(
      style(Style.MAPBOX_STREETS) {
        +image(FILL_PATTERN_ID, changeBitmapColor(initialBitmap, randomColor()))
        +fillLayer(FILL_LAYER_ID, STREETS_SOURCE_ID) {
          sourceLayer(SOURCE_LAYER)
          fillPattern(FILL_PATTERN_ID)
          fillOpacity(
            linearInterpolator(
              input = zoom(),
              stops = arrayOf(
                literal(13.0) to literal(0.0),
                literal(15.0) to literal(0.5),
                literal(17.0) to literal(0.75)
              )
            )
          )
          filter(
            eq {
              get { literal(FILTER_FIELD) }
              literal(FILTER_VALUE)
            }
          )
        }
      }
    )
  }

  private fun changeBitmapColor(sourceBitmap: Bitmap, @ColorInt color: Int): Bitmap {
    val resultBitmap: Bitmap = sourceBitmap.copy(sourceBitmap.config, true)
    val paint = Paint()
    paint.colorFilter = PorterDuffColorFilter(color, PorterDuff.Mode.SRC_IN)
    val canvas = Canvas(resultBitmap)
    canvas.drawBitmap(resultBitmap, 0f, 0f, paint)
    return resultBitmap
  }

  private fun randomColor(): Int {
    return (Math.random() * 16777215).toInt() or (0xFF shl 24)
  }

  companion object {
    private const val FILL_LAYER_ID = "fill_layer_id"
    private const val FILL_PATTERN_ID = "fill_pattern_id"
    private const val STREETS_SOURCE_ID = "composite"
    private const val SOURCE_LAYER = "landuse"
    private const val FILTER_FIELD = "class"
    private const val FILTER_VALUE = "parking"
  }
}
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