fix: GoogleCredential to GoogleCredentials (#35)

Author: kroikie

messaging/build.gradle

@@ -22,6 +22,6 @@ run {
 dependencies {
  testCompile group: 'junit', name: 'junit', version: '4.12'
 
- compile 'com.google.api-client:google-api-client:1.22.0'
- compile 'com.google.code.gson:gson:2.8.1'
+ compile 'com.google.auth:google-auth-library-oauth2-http:0.26.0'
+ compile 'com.google.code.gson:gson:2.8.7'
 }

messaging/src/main/java/com/google/firebase/quickstart/Messaging.java

@@ -1,6 +1,6 @@
 packagecom.google.firebase.quickstart;
 
-importcom.google.api.client.googleapis.auth.oauth2.GoogleCredential;
+importcom.google.auth.oauth2.GoogleCredentials;
 importcom.google.gson.Gson;
 importcom.google.gson.GsonBuilder;
 importcom.google.gson.JsonObject;
@@ -43,11 +43,11 @@ public class Messaging {
  */
 // [START retrieve_access_token]
 privatestaticStringgetAccessToken() throwsIOException {
-GoogleCredentialgoogleCredential = GoogleCredential
- .fromStream(newFileInputStream("service-account.json"))
- .createScoped(Arrays.asList(SCOPES));
-googleCredential.refreshToken();
-returngoogleCredential.getAccessToken();
+GoogleCredentialsgoogleCredentials = GoogleCredentials
+.fromStream(newFileInputStream("service-account.json"))
+.createScoped(Arrays.asList(SCOPES));
+googleCredentials.refreshAccessToken();
+returngoogleCredentials.getAccessToken().getTokenValue();
  }
 // [END retrieve_access_token]