all done

app/src/main/AndroidManifest.xml

@@ -7,9 +7,9 @@
     <application
         android:name=".SunnyWeatherApplication"
         android:allowBackup="true"
-        android:icon="@mipmap/ic_launcher"
+        android:icon="@mipmap/ic_weather_launcher"
         android:label="@string/app_name"
-        android:roundIcon="@mipmap/ic_launcher_round"
+        android:roundIcon="@mipmap/ic_weather_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity android:name=".ui.weather.WeatherActivity" />

app/src/main/java/com/sunnyweather/android/ui/place/PlaceAdapter.kt

@@ -9,6 +9,7 @@ import androidx.recyclerview.widget.RecyclerView
 import com.sunnyweather.android.R
 import com.sunnyweather.android.logic.model.Place
 import com.sunnyweather.android.ui.weather.WeatherActivity
+import kotlinx.android.synthetic.main.activity_weather.*
 
 class PlaceAdapter(private val fragment: PlaceFragment, private val placeList: List<Place>) : RecyclerView.Adapter<PlaceAdapter.ViewHolder>() {
 
@@ -22,13 +23,26 @@ class PlaceAdapter(private val fragment: PlaceFragment, private val placeList: L
         holder.itemView.setOnClickListener {
             val position = holder.adapterPosition
             val place = placeList[position]
-            val intent = Intent(parent.context, WeatherActivity::class.java).apply {
-                putExtra("location_lng", place.location.lng)
-                putExtra("location_lat", place.location.lat)
-                putExtra("place_name", place.name)
+            val activity = fragment.activity
+            if (activity is WeatherActivity) {
+                activity.drawerLayout.closeDrawers()
+                activity.viewModel.locationLng = place.location.lng
+                activity.viewModel.locationLng = place.location.lat
+                activity.viewModel.placeName = place.name
+
+                activity.refreshWeather()
+            }
+            else {
+                val intent = Intent(parent.context, WeatherActivity::class.java).apply {
+                    putExtra("location_lng", place.location.lng)
+                    putExtra("location_lat", place.location.lat)
+                    putExtra("place_name", place.name)
+                }
+                fragment.startActivity(intent)
+                activity?.finish()
             }
             fragment.viewModel.savePlace(place)
-            fragment.startActivity(intent)
+
         }
         return holder
     }

app/src/main/java/com/sunnyweather/android/ui/weather/WeatherActivity.kt

@@ -27,7 +27,7 @@ import java.util.*
 
 class WeatherActivity : AppCompatActivity() {
 
-    private val viewModel by lazy {
+    val viewModel by lazy {
         ViewModelProvider(this).get(WeatherViewModel::class.java)
     }
 
@@ -83,7 +83,7 @@ class WeatherActivity : AppCompatActivity() {
         })
     }
 
-    private fun refreshWeather() {
+    fun refreshWeather() {
         viewModel.refreshWeather(viewModel.locationLng, viewModel.locationLat)
         swipeRefresh.isRefreshing = true
     }

app/src/main/res/layout/now.xml

@@ -11,13 +11,14 @@
         android:layout_height="70dp"
         android:fitsSystemWindows="true">
 
-        <Button
+        <ImageButton
             android:id="@+id/navBtn"
             android:layout_width="30dp"
             android:layout_height="30dp"
             android:layout_gravity="center_vertical"
             android:layout_marginStart="15dp"
-            android:background="@drawable/ic_home" />
+            android:background="@drawable/ic_home"
+            android:contentDescription="TODO" />
 
         <TextView
             android:id="@+id/placeName"

app/src/main/res/mipmap-anydpi-v26/ic_weather_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_weather_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_weather_launcher_foreground"/>
+</adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_weather_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_weather_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_weather_launcher_foreground"/>
+</adaptive-icon>

app/src/main/res/values/ic_weather_launcher_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_weather_launcher_background">#219FDD</color>
+</resources>

app/src/main/res/values/strings.xml

@@ -1,3 +1,3 @@
 <resources>
-    <string name="app_name">SunnyWeather</string>
+    <string name="app_name">🐖天气</string>
 </resources>