[firebase_database] Support v2 android embedder. (#287)

Author: Chris Yang

packages/firebase_database/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 3.1.0
+
+* Support Android V2 embedding.
+* Migrate to using the new e2e test binding.
+
 ## 3.0.9
 
 * Updated README instructions for contributing for consistency with other Flutterfire plugins.

packages/firebase_database/android/build.gradle

@@ -38,3 +38,28 @@ android {
 }
 
 apply from: file("./user-agent.gradle")
+
+afterEvaluate {
+    def containsEmbeddingDependencies = false
+    for (def configuration : configurations.all) {
+        for (def dependency : configuration.dependencies) {
+            if (dependency.group == 'io.flutter' &&
+                dependency.name.startsWith('flutter_embedding') &&
+                dependency.isTransitive())
+            {
+                containsEmbeddingDependencies = true
+                break
+            }
+        }
+    }
+    if (!containsEmbeddingDependencies) {
+        android {
+            dependencies {
+                def lifecycle_version = "1.1.1"
+                compileOnly "android.arch.lifecycle:runtime:$lifecycle_version"
+                compileOnly "android.arch.lifecycle:common:$lifecycle_version"
+                compileOnly "android.arch.lifecycle:common-java8:$lifecycle_version"
+            }
+        }
+    }
+}