Target SDK 28

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/build.gradle

@@ -11,12 +11,12 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
-    compileSdkVersion 27
+    compileSdkVersion 28
     dataBinding.enabled true
     defaultConfig {
         applicationId 'com.wireguard.android'
         minSdkVersion 21
-        targetSdkVersion 27
+        targetSdkVersion 28
         versionCode 438
         versionName '0.0.20180729'
         buildConfigField 'int', 'MIN_SDK_VERSION', "$minSdkVersion.apiLevel"

app/src/main/java/com/wireguard/android/QuickTileService.java

@@ -58,13 +58,10 @@ public class QuickTileService extends TileService {
         return ret;
     }
 
-    /* TODO: for Android P: Build.VERSION_CODES.P */
-    private static final int BUILD_VERSION_CODES_P = 28;
-
     @SuppressWarnings("deprecation")
     @Override
     public void onCreate() {
-        if (Build.VERSION.SDK_INT >= BUILD_VERSION_CODES_P) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
             iconOff = iconOn = Icon.createWithResource(this, R.drawable.ic_tile);
             return;
         }