Add a gradle warning to the AndroidX plugins (flutter#1138)

This warning is only printed once per plugin on build failure.

flutter/flutter#27106

Author: Michael Klimushyn

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.3.0+3
+
+* Log a more detailed warning at build time about the previous AndroidX
+  migration.
+
 ## 0.3.0+2
 
 * Fix issue with calculating iOS image orientation in certain edge cases.

android/build.gradle

@@ -1,3 +1,16 @@
+def PLUGIN = "camera";
+def ANDROIDX_WARNING = "flutterPluginsAndroidXWarning";
+gradle.buildFinished { buildResult ->
+    if (buildResult.failure && !rootProject.ext.has(ANDROIDX_WARNING)) {
+        println '         *********************************************************'
+        println 'WARNING: This version of ' + PLUGIN + ' will break your Android build if it or its dependencies aren\'t compatible with AndroidX.'
+        println '         See https://goo.gl/CP92wY for more information on the problem and how to fix it.'
+        println '         This warning prints for all Android build failures. The real root cause of the error may be unrelated.'
+        println '         *********************************************************'
+        rootProject.ext.set(ANDROIDX_WARNING, true);
+    }
+}
+
 group 'io.flutter.plugins.camera'
 version '1.0-SNAPSHOT'
 

pubspec.yaml

@@ -1,7 +1,7 @@
 name: camera
 description: A Flutter plugin for getting information about and controlling the
   camera on Android and iOS. Supports previewing the camera feed and capturing images.
-version: 0.3.0+2
+version: 0.3.0+3
 authors:
   - Flutter Team <[email protected]>
   - Luigi Agosti <[email protected]>