diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
new file mode 100644
index 00000000..029480d1
--- /dev/null
+++ b/.github/workflows/android.yml
@@ -0,0 +1,49 @@
+name: Android CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: set up JDK 20
+      uses: actions/setup-java@v3
+      with:
+        java-version: '20'
+        distribution: 'temurin'
+        cache: gradle
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+    - name: Build with Gradle
+      run: ./gradlew assembleRelease
+
+    - name: Upload arm64 artifacts
+      id: upload-arm64-apk
+      uses: actions/upload-artifact@v3
+      with:
+        name: release-arm64-apk
+        path: app/build/outputs/apk/app/release/*arm64-v8a.apk
+      continue-on-error: true
+
+    - name: Upload armv7 artifacts
+      id: upload-armv7-apk
+      uses: actions/upload-artifact@v3
+      with:
+        name: release-armv7-apk
+        path: app/build/outputs/apk/app/release/*-v7a.apk
+      continue-on-error: true
+
+    - name: Upload universl artifacts
+      id: upload-universal-apk
+      uses: actions/upload-artifact@v3
+      with:
+        name: release-universal-apk
+        path: app/build/outputs/apk/app/release/*universal.apk
+      continue-on-error: true
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index e2759af8..dc203c7d 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -657,6 +657,9 @@ class Versions(filePath: String) {
             "2023.1" to javaVersionMinSuggested, /* Aug 17, 2023. */
             "2022.3" to javaVersionMinSuggested, /* Aug 17, 2023. */
         ),
+        "unknown" to mapOf(
+            /* Empty for unknown. */
+        )
     )
 
     val javaVersion: JavaVersion by lazy {
diff --git a/gradlew b/gradlew
old mode 100644
new mode 100755
diff --git a/settings.gradle.kts b/settings.gradle.kts
index a60989d9..8dfe322e 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -91,6 +91,14 @@ pluginManagement {
                 fallbackIdentifier to "1.8.21", /* May 3, 2023. */
             ),
         ),
+        "unknown" to mapOf(
+            "android" to mapOf(
+                fallbackIdentifier to "8.1.2", /* Oct 30, 2023. */
+            ),
+            "kotlin" to mapOf(
+                fallbackIdentifier to "1.8.21", /* May 3, 2023. */
+            ),
+        )
     )
 
     val kspPluginVersionMap = mapOf(
@@ -156,7 +164,7 @@ pluginManagement {
     val fallbackSuffix = " [$fallbackIdentifier]"
 
     /* Nullable. */
-    val platform = System.getProperty("idea.paths.selector") ?: System.getProperty("idea.platform.prefix")
+    val platform = System.getProperty("idea.paths.selector") ?: System.getProperty("idea.platform.prefix") ?: unknownIdentifier
 
     val isPlatformAS = platform?.startsWith(platformIdentifierForAS) == true
             || System.getProperty("idea.vendor.name").equals(vendorNameForAS, true)
@@ -166,7 +174,7 @@ pluginManagement {
     val platformType = when {
         isPlatformAS -> "as"
         isPlatformIdea -> "idea"
-        else -> throw Exception("$unknownIdentifier1Up platform: $platform")
+        else -> unknownIdentifier
     }
 
     val previewIdentifier = when {
@@ -175,12 +183,12 @@ pluginManagement {
         else -> ""
     }
 
-    val previewIdentifier1Up = uppercaseFirstChar(previewIdentifier)
+    val previewIdentifier1Up = previewIdentifier ?: uppercaseFirstChar(previewIdentifier)
 
     val platformVersion = (System.getProperty("idea.version") ?: when {
         isPlatformAS -> platform?.substring(platformIdentifierForAS.length)
         isPlatformIdea -> platform?.substring(platformIdentifierForIdea.length)
-        else -> null
+        else -> unknownIdentifier
     } ?: throw Exception("$unknownIdentifier1Up platform version"))
         .let { rawVersion ->
             platform?.let { rawVersion }
@@ -339,4 +347,4 @@ pluginManagement {
         ).forEach { println(it) }
     }
 
-}
\ No newline at end of file
+}