fix: add stub for IMA and option to enable it on demand

android/build.gradle

@@ -4,6 +4,18 @@ def safeExtGet(prop, fallback) {
     rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
 }
 
+def useExoplayerIMA = safeExtGet("RNVUseExoplayerIMA", false)
+
+println "useExoplayerIMA:" + useExoplayerIMA
+
+// This string is used to define build path.
+// As react native build output directory is react-native path of the module.
+// We need to force a new path on each configuration change.
+// If you add a new build parameter, please add the new value in this string
+def configStringPath = (
+        'useExoplayerIMA' + useExoplayerIMA \
+).md5()
+
 android {
     compileSdkVersion safeExtGet('compileSdkVersion', 31)
     buildToolsVersion safeExtGet('buildToolsVersion', '30.0.2')
@@ -24,6 +36,19 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+
+    buildDir 'buildOutput_' + configStringPath
+
+    sourceSets {
+        main {
+            java {
+                if (useExoplayerIMA) {
+                    exclude 'com/google/ads/interactivemedia/v3/api'
+                    exclude 'com/android/exoplayer2/ext/ima'
+                }
+            }
+        }
+    }
 }
 
 repositories {
@@ -45,7 +70,9 @@ dependencies {
     implementation('com.google.android.exoplayer:extension-okhttp:2.18.1') {
         exclude group: 'com.squareup.okhttp3', module: 'okhttp'
     }
-    implementation 'com.google.android.exoplayer:extension-ima:2.18.1'
 
+    if (useExoplayerIMA) {
+        implementation 'com.google.android.exoplayer:extension-ima:2.18.1'
+    }
     implementation "com.squareup.okhttp3:okhttp:" + '$OKHTTP_VERSION'
 }