decrease memory usage of charger icons

by allowing "fault" and "highlight" only with scale == 1f
refs #59

app/src/main/java/net/vonforst/evmap/fragment/MapFragment.kt

@@ -54,7 +54,9 @@ import com.mapzen.android.lost.api.LocationServices
 import com.mapzen.android.lost.api.LostApiClient
 import io.michaelrocks.bimap.HashBiMap
 import io.michaelrocks.bimap.MutableBiMap
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import net.vonforst.evmap.*
 import net.vonforst.evmap.adapter.ConnectorAdapter
 import net.vonforst.evmap.adapter.DetailsAdapter
@@ -639,6 +641,12 @@ class MapFragment : Fragment(), OnMapReadyCallback, MapsActivity.FragmentCallbac
     override fun onMapReady(map: AnyMap) {
         this.map = map
         chargerIconGenerator = ChargerIconGenerator(requireContext(), map.bitmapDescriptorFactory)
+        lifecycleScope.launch {
+            withContext(Dispatchers.IO) {
+                chargerIconGenerator.preloadCache()
+            }
+        }
+
         animator = MarkerAnimator(chargerIconGenerator)
         map.uiSettings.setTiltGesturesEnabled(false)
         map.setIndoorEnabled(false)
@@ -822,7 +830,7 @@ class MapFragment : Fragment(), OnMapReadyCallback, MapsActivity.FragmentCallbac
                             .icon(
                                 chargerIconGenerator.getBitmapDescriptor(
                                     tint,
-                                    0,
+                                    0f,
                                     255,
                                     highlight,
                                     fault,

app/src/main/java/net/vonforst/evmap/ui/IconGenerators.kt

@@ -16,6 +16,7 @@ import com.car2go.maps.model.BitmapDescriptor
 import com.google.maps.android.ui.IconGenerator
 import com.google.maps.android.ui.SquareTextView
 import net.vonforst.evmap.R
+import kotlin.math.roundToInt
 
 class ClusterIconGenerator(context: Context) : IconGenerator(context) {
     init {
@@ -41,8 +42,11 @@ class ClusterIconGenerator(context: Context) : IconGenerator(context) {
 }
 
 
-class ChargerIconGenerator(val context: Context, val factory: BitmapDescriptorFactory) {
-    data class BitmapData(
+class ChargerIconGenerator(
+    val context: Context, val factory: BitmapDescriptorFactory,
+    val scaleResolution: Int = 20
+) {
+    private data class BitmapData(
         val tint: Int,
         val scale: Int,
         val alpha: Int,
@@ -51,20 +55,17 @@ class ChargerIconGenerator(val context: Context, val factory: BitmapDescriptorFa
         val multi: Boolean
     )
 
-    val cacheSize = 840; // 840 items: 21 sizes, 5 colors, highlight, fault, multi on/off
-    val cache = LruCache<BitmapData, BitmapDescriptor>(cacheSize)
-    val oversize = 1.4f  // increase to add padding for fault icon or scale > 1
-    val icon = R.drawable.ic_map_marker_charging
-    val multiIcon = R.drawable.ic_map_marker_charging_multiple
-    val highlightIcon = R.drawable.ic_map_marker_highlight
-    val highlightIconMulti = R.drawable.ic_map_marker_charging_highlight_multiple
-    val faultIcon = R.drawable.ic_map_marker_fault
+    // 230 items: (21 sizes, 5 colors, multi on/off) + highlight + fault (only with scale = 1)
+    private val cacheSize = (scaleResolution + 3) * 5 * 2;
+    private val cache = LruCache<BitmapData, BitmapDescriptor>(cacheSize)
+    private val oversize = 1.4f  // increase to add padding for fault icon or scale > 1
+    private val icon = R.drawable.ic_map_marker_charging
+    private val multiIcon = R.drawable.ic_map_marker_charging_multiple
+    private val highlightIcon = R.drawable.ic_map_marker_highlight
+    private val highlightIconMulti = R.drawable.ic_map_marker_charging_highlight_multiple
+    private val faultIcon = R.drawable.ic_map_marker_fault
 
-    init {
-        preloadCache()
-    }
-
-    private fun preloadCache() {
+    fun preloadCache() {
         // pre-generates images for scale from 0 to 255 for all possible tint colors
         val tints = listOf(
             R.color.charger_100kw,
@@ -77,8 +78,11 @@ class ChargerIconGenerator(val context: Context, val factory: BitmapDescriptorFa
             for (highlight in listOf(false, true)) {
                 for (multi in listOf(false, true)) {
                     for (tint in tints) {
-                        for (scale in 0..20) {
-                            getBitmapDescriptor(tint, scale, 255, highlight, fault, multi)
+                        for (scale in 0..scaleResolution) {
+                            getBitmapDescriptor(
+                                tint, scale.toFloat() / scaleResolution,
+                                255, highlight, fault, multi
+                            )
                         }
                     }
                 }
@@ -88,13 +92,19 @@ class ChargerIconGenerator(val context: Context, val factory: BitmapDescriptorFa
 
     fun getBitmapDescriptor(
         @ColorRes tint: Int,
-        scale: Int = 20,
+        scale: Float = 1f,
         alpha: Int = 255,
         highlight: Boolean = false,
         fault: Boolean = false,
         multi: Boolean = false
     ): BitmapDescriptor? {
-        val data = BitmapData(tint, scale, alpha, highlight, fault, multi)
+        val data = BitmapData(
+            tint, (scale * scaleResolution).roundToInt(),
+            alpha,
+            if (scale == 1f) highlight else false,
+            if (scale == 1f) fault else false,
+            multi
+        )
         val cachedImg = cache[data]
         return if (cachedImg != null) {
             cachedImg
@@ -128,7 +138,7 @@ class ChargerIconGenerator(val context: Context, val factory: BitmapDescriptorFa
         )
         val canvas = Canvas(bm)
 
-        val scale = data.scale / 20f
+        val scale = data.scale.toFloat() / scaleResolution
         canvas.scale(
             scale,
             scale,

app/src/main/java/net/vonforst/evmap/ui/MarkerUtils.kt

@@ -36,11 +36,11 @@ class MarkerAnimator(val gen: ChargerIconGenerator) {
             animatingMarkers.remove(marker)
         }
 
-        val anim = ValueAnimator.ofInt(0, 20).apply {
+        val anim = ValueAnimator.ofFloat(0f, 1f).apply {
             duration = 250
             interpolator = LinearOutSlowInInterpolator()
             addUpdateListener { animationState ->
-                val scale = animationState.animatedValue as Int
+                val scale = animationState.animatedValue as Float
                 marker.setIcon(
                     gen.getBitmapDescriptor(
                         tint,
@@ -73,11 +73,11 @@ class MarkerAnimator(val gen: ChargerIconGenerator) {
             animatingMarkers.remove(marker)
         }
 
-        val anim = ValueAnimator.ofInt(20, 0).apply {
+        val anim = ValueAnimator.ofFloat(1f, 0f).apply {
             duration = 200
             interpolator = FastOutLinearInInterpolator()
             addUpdateListener { animationState ->
-                val scale = animationState.animatedValue as Int
+                val scale = animationState.animatedValue as Float
                 marker.setIcon(
                     gen.getBitmapDescriptor(
                         tint,