feature: separate package names for pre release and dev builds

V2rayNG/app/build.gradle

@@ -36,6 +36,21 @@ android {
         }
     }
 
+    flavorDimensions "versions"
+
+    productFlavors {
+        dev {
+            applicationIdSuffix = ".dev"
+            versionNameSuffix = "-dev"
+        }
+        pre_release {
+            applicationIdSuffix = ".pre"
+            versionNameSuffix = "-pre-release"
+        }
+        prod {
+        }
+    }
+
     sourceSets {
         main {
             jniLibs.srcDirs = ['libs']

V2rayNG/app/src/dev/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <item name="app_name" type="string">v2rayNG (DEV)</item>
+</resources>

V2rayNG/app/src/pre_release/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name" translatable="false">v2rayNG (PR)</string>
+</resources>