Tint a fill layer | Maps SDK | Android

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

activity_rts_fill_pattern_tint

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".examples.linesandpolygons.DrawGeoJsonLineActivity">
 
<com.mapbox.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="37.785301"
mapbox:mapbox_cameraTargetLng="-122.395922"
mapbox:mapbox_cameraZoom="16" />
 
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fabPaint"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="16dp"
android:src="@drawable/ic_paint"
mapbox:backgroundTint="@color/primary" />
 
</FrameLayout>

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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