fix: Fix namespace/AndroidManifest.package error on Android Gradl…

…e Plugin 8/React Native 0.73 (#624)

android/build.gradle

@@ -1,3 +1,9 @@
+import com.android.Version
+
+def agpVersion = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION
+def agpVersionMajor = agpVersion.tokenize('.')[0].toInteger()
+def androidManifestPath = agpVersionMajor >= 7 ? 'src/main/AndroidManifest.xml' : 'src/hasNamespace/AndroidManifest.xml'
+
 buildscript {
   repositories {
     maven {
@@ -46,16 +52,23 @@ repositories {
 }
 
 android {
-  namespace = "com.reactnativemmkv"
   compileSdkVersion safeExtGet("compileSdkVersion", 28)
-  def agpVersion = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION
+  if (agpVersionMajor >= 7) {
+    namespace = "com.reactnativemmkv"
+  }
 
-  if (agpVersion.tokenize('.')[0].toInteger() >= 8) {
+  if (agpVersionMajor >= 8) {
       buildFeatures {
           buildConfig = true
       }
   }
 
+  sourceSets {
+    main {
+      manifest.srcFile androidManifestPath
+    }
+  }
+
   // Used to override the NDK path/version on internal CI or by allowing
   // users to customize the NDK path/version from their root project (e.g. for M1 support)
   if (rootProject.hasProperty("ndkPath")) {

android/src/hasNamespace/AndroidManifest.xml

@@ -0,0 +1,3 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>