[android] - update snapshot activity example with idle listener, conv…

…ert to kotlin

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/imagegenerator/SnapshotActivity.kt

@@ -0,0 +1,80 @@
+package com.mapbox.mapboxsdk.testapp.activity.imagegenerator
+
+import android.os.Bundle
+import android.support.v7.app.AppCompatActivity
+import com.mapbox.mapboxsdk.maps.MapView
+import com.mapbox.mapboxsdk.maps.MapboxMap
+import com.mapbox.mapboxsdk.maps.OnMapReadyCallback
+import com.mapbox.mapboxsdk.maps.Style
+import com.mapbox.mapboxsdk.testapp.R
+import kotlinx.android.synthetic.main.activity_snapshot.*
+import timber.log.Timber
+
+/**
+ * Test activity showcasing the Snapshot API to create and display a bitmap of the current shown Map.
+ */
+class SnapshotActivity : AppCompatActivity(), OnMapReadyCallback {
+
+  private lateinit var mapboxMap: MapboxMap
+
+  private val idleListener = object : MapView.OnDidBecomeIdleListener {
+    override fun onDidBecomeIdle() {
+      mapView.removeOnDidBecomeIdleListener(this)
+      mapboxMap.snapshot { snapshot ->
+        imageView.setImageBitmap(snapshot)
+        mapView.addOnDidBecomeIdleListener(this)
+      }
+    }
+  }
+
+  public override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    setContentView(R.layout.activity_snapshot)
+    mapView.onCreate(savedInstanceState)
+    mapView.getMapAsync(this)
+  }
+
+  override fun onMapReady(map: MapboxMap) {
+    mapboxMap = map
+    mapboxMap.setStyle(Style.Builder().fromUrl(Style.OUTDOORS)) { mapView.addOnDidBecomeIdleListener(idleListener) }
+  }
+
+  override fun onStart() {
+    super.onStart()
+    mapView.onStart()
+  }
+
+  override fun onResume() {
+    super.onResume()
+    mapView.onResume()
+  }
+
+  override fun onPause() {
+    super.onPause()
+    mapboxMap.snapshot {
+      Timber.e("Regression test for https://github.com/mapbox/mapbox-gl-native/pull/11358")
+    }
+    mapView.onPause()
+  }
+
+  override fun onStop() {
+    super.onStop()
+    mapView.onStop()
+  }
+
+  public override fun onSaveInstanceState(outState: Bundle) {
+    super.onSaveInstanceState(outState)
+    mapView.onSaveInstanceState(outState)
+  }
+
+  override fun onLowMemory() {
+    super.onLowMemory()
+    mapView.onLowMemory()
+  }
+
+  public override fun onDestroy() {
+    super.onDestroy()
+    mapView.removeOnDidBecomeIdleListener(idleListener)
+    mapView.onDestroy()
+  }
+}

platform/android/MapboxGLAndroidSDKTestApp/src/main/res/layout/activity_snapshot.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">
@@ -27,15 +26,4 @@
 
     </LinearLayout>
 
-    <android.support.design.widget.FloatingActionButton
-        android:id="@id/fab"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_alignParentBottom="true"
-        android:layout_alignParentEnd="true"
-        android:layout_alignParentRight="true"
-        android:layout_margin="@dimen/fab_margin"
-        android:src="@drawable/ic_add_a_photo_black"
-        app:backgroundTint="@android:color/white"/>
-
 </RelativeLayout>