Downgrade used SDK

build.gradle

@@ -8,8 +8,8 @@ buildscript {
     ]
 
     ext.build = [
-        compileSdkVersion: 28,
-        targetSdkVersion: 28,
+        compileSdkVersion: 27,
+        targetSdkVersion: 27,
         minSdkVersion: 21, // So that we can publish for aarch64.
     ]
 

samples/android/app/build.gradle

@@ -36,6 +36,6 @@ dependencies {
 
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 
-    implementation "com.android.support:appcompat-v7:28.0.0"
-    //implementation "com.android.support:customtabs:28.0.0"
+    implementation "com.android.support:appcompat-v7:27.0.0"
+    implementation "com.android.support:customtabs:27.0.0"
 }

samples/android/app/src/main/AndroidManifest.xml

@@ -17,7 +17,7 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.AppCompat.Light.DarkActionBar"
         android:name=".GleanApplication">
-        <activity android:name="org.mozilla.samples.glean.MainActivity"
+        <activity android:name="org.mozilla.samples.glean_rs.MainActivity"
             android:windowSoftInputMode="adjustResize"
             android:launchMode="singleTask">
             <intent-filter>

samples/android/app/src/main/res/layout/activity_main.xml

@@ -14,7 +14,7 @@
     android:gravity="center"
     android:orientation="vertical"
     android:padding="10dp"
-    tools:context="org.mozilla.samples.glean.MainActivity">
+    tools:context="org.mozilla.samples.glean_rs.MainActivity">
 
     <!-- This is a dummy linear layout to capture focus and prevent the keyboard from popping
         when the app first launches.  This is a known issue of linear layouts and a common