Launcher icon: use vector (layer-list for API21+ and adaptive-icon for API26+).

Author: dennisguse

src/debug/res/mipmap-hdpi/ic_launcher.png

@@ -52,7 +52,7 @@ limitations under the License.
         android:allowBackup="false"
         android:hardwareAccelerated="true"
         android:hasFragileUserData="false"
-        android:icon="@mipmap/ic_launcher"
+        android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/ThemeCustom">

src/debug/res/mipmap-mdpi/ic_launcher.png

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape android:shape="oval">
+            <solid android:color="@color/ic_launcher_background" />
+        </shape>
+    </item>
+    <item android:drawable="@drawable/ic_logo_color_108dp" />
+</layer-list>