Build against stable flutter build

.travis.yml

@@ -14,7 +14,7 @@ matrix:
             - libstdc++6
             - fonts-droid
       before_script:
-        - git clone --single-branch --branch dev https://github.com/flutter/flutter.git $HOME/flutter
+        - git clone --single-branch --branch stable https://github.com/flutter/flutter.git $HOME/flutter
         - export PATH=$HOME/flutter/bin:$HOME/flutter/bin/cache/dart-sdk/bin:$PATH
         - flutter doctor
       script:

lib/permission_handler.dart

@@ -34,7 +34,7 @@ class PermissionHandler {
   /// Returns a [Future] containing the current permission status for the supplied [PermissionGroup].
   Future<PermissionStatus> checkPermissionStatus(
       PermissionGroup permission) async {
-    final String status = await _methodChannel.invokeMethod<String>(
+    final String status = await _methodChannel.invokeMethod(
         'checkPermissionStatus', Codec.encodePermissionGroup(permission));
 
     return Codec.decodePermissionStatus(status);
@@ -45,7 +45,7 @@ class PermissionHandler {
   /// Returns a [Future] containing the current service status for the supplied [PermissionGroup].
   Future<ServiceStatus> checkServiceStatus(
       PermissionGroup permission) async {
-    final String status = await _methodChannel.invokeMethod<String>(
+    final String status = await _methodChannel.invokeMethod(
       'checkServiceStatus', Codec.encodePermissionGroup(permission));
 
     return Codec.decodeServiceStatus(status);
@@ -55,7 +55,7 @@ class PermissionHandler {
   ///
   /// Returns [true] if the app settings page could be opened, otherwise [false] is returned.
   Future<bool> openAppSettings() async {
-    final bool hasOpened = await _methodChannel.invokeMethod<bool>(
+    final bool hasOpened = await _methodChannel.invokeMethod(
         'openAppSettings');
 
     return hasOpened;
@@ -68,7 +68,7 @@ class PermissionHandler {
       List<PermissionGroup> permissions) async {
     final String jsonData = Codec.encodePermissionGroups(permissions);
     final String status =
-        await _methodChannel.invokeMethod<String>(
+        await _methodChannel.invokeMethod(
             'requestPermissions', jsonData);
 
     return Codec.decodePermissionRequestResult(status);
@@ -84,7 +84,7 @@ class PermissionHandler {
       return false;
     }
 
-    final bool shouldShowRationale = await _methodChannel.invokeMethod<bool>(
+    final bool shouldShowRationale = await _methodChannel.invokeMethod(
         'shouldShowRequestPermissionRationale',
         Codec.encodePermissionGroup(permission));
 

scripts/before_build_apks.sh

@@ -20,7 +20,7 @@ unzip -qq gradle-4.1-bin.zip -d $HOME/gradle-4.1
 export GRADLE_HOME=$HOME/gradle-4.1
 export PATH=$GRADLE_HOME/bin:$PATH
 gradle -v
-git clone --single-branch --branch dev https://github.com/flutter/flutter.git $HOME/flutter
+git clone --single-branch --branch stable https://github.com/flutter/flutter.git $HOME/flutter
 export PATH=$HOME/flutter/bin:$HOME/flutter/bin/cache/dart-sdk/bin:$PATH
 flutter doctor
 

scripts/before_build_ipas.sh

@@ -5,6 +5,6 @@ brew install ideviceinstaller
 brew install ios-deploy
 pod repo update
 gem update cocoapods
-git clone --single-branch --branch dev https://github.com/flutter/flutter.git $HOME/flutter
+git clone --single-branch --branch stable https://github.com/flutter/flutter.git $HOME/flutter
 export PATH=$HOME/flutter/bin:$HOME/flutter/bin/cache/dart-sdk/bin:$PATH
 flutter doctor