always use Mapbox autocomplete

to avoid Google API costs
fixes #105

app/src/main/java/net/vonforst/evmap/autocomplete/Autocomplete.kt

@@ -0,0 +1,49 @@
+package net.vonforst.evmap.autocomplete
+
+import android.content.Context
+import android.content.Intent
+import android.view.inputmethod.InputMethodManager
+import androidx.fragment.app.Fragment
+import com.car2go.maps.model.LatLng
+import com.car2go.maps.model.LatLngBounds
+import com.mapbox.geojson.BoundingBox
+import com.mapbox.geojson.Point
+import com.mapbox.mapboxsdk.plugins.places.autocomplete.PlaceAutocomplete
+import com.mapbox.mapboxsdk.plugins.places.autocomplete.model.PlaceOptions
+import net.vonforst.evmap.R
+import net.vonforst.evmap.fragment.REQUEST_AUTOCOMPLETE
+import net.vonforst.evmap.viewmodel.PlaceWithBounds
+
+
+fun launchAutocomplete(fragment: Fragment) {
+    val placeOptions = PlaceOptions.builder()
+        .build(PlaceOptions.MODE_CARDS)
+
+    val intent = PlaceAutocomplete.IntentBuilder()
+        .accessToken(fragment.getString(R.string.mapbox_key))
+        .placeOptions(placeOptions)
+        .build(fragment.requireActivity())
+        .addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION)
+    fragment.startActivityForResult(intent, REQUEST_AUTOCOMPLETE)
+
+    // show keyboard
+    val imm = fragment.requireContext()
+        .getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+    imm.toggleSoftInput(0, 0)
+}
+
+fun handleAutocompleteResult(intent: Intent): PlaceWithBounds? {
+    val place = PlaceAutocomplete.getPlace(intent) ?: return null
+    val bbox = place.bbox()?.toLatLngBounds()
+    val center = place.center()!!.toLatLng()
+    return PlaceWithBounds(center, bbox)
+}
+
+private fun BoundingBox.toLatLngBounds(): LatLngBounds {
+    return LatLngBounds(
+        southwest().toLatLng(),
+        northeast().toLatLng()
+    )
+}
+
+private fun Point.toLatLng(): LatLng = LatLng(this.latitude(), this.longitude())