F-droid flavour

app/build.gradle

@@ -61,7 +61,6 @@ android {
             minifyEnabled true
             shrinkResources true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
-            signingConfig signingConfigs.release
         }
         debug {
             applicationIdSuffix '.debug'
@@ -81,6 +80,21 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+    flavorDimensions "version"
+    productFlavors {
+        productFlavors {
+            play {
+                dimension "version"
+                signingConfig signingConfigs.release
+            }
+            fdroid {
+                dimension "version"
+                // applicationIdSuffix ".fdroid"
+                versionNameSuffix ' (F-Droid)'
+
+            }
+        }
+    }
 }
 
 dependencies {

app/src/main/java/com/kabouzeid/gramophone/App.java

@@ -69,7 +69,10 @@ public void onBillingInitialized() {
     }
 
     public static boolean isProVersion() {
-        return BuildConfig.DEBUG || app.billingProcessor.isPurchased(PRO_VERSION_PRODUCT_ID);
+        if (BuildConfig.DEBUG || BuildConfig.FLAVOR.equals("fdroid")) {
+            return true;
+        }
+        return app.billingProcessor.isPurchased(PRO_VERSION_PRODUCT_ID);
     }
 
     private static OnProVersionChangedListener onProVersionChangedListener;