Improve network error handling (#1811)

Author: samtstern

CHANGELOG.md

@@ -1,2 +1,3 @@
 - Fixes issue with custom parameters for OAuth providers (#1805)
 - Restore `setGithubButtonId` when using custom layouts (#1783)
+- Improve how network errors display when they are non-fatal (#1803)

auth/src/main/java/com/firebase/ui/auth/ui/email/CheckEmailFragment.java

@@ -23,7 +23,9 @@
 import com.firebase.ui.auth.util.ui.ImeHelper;
 import com.firebase.ui.auth.util.ui.fieldvalidators.EmailFieldValidator;
 import com.firebase.ui.auth.viewmodel.ResourceObserver;
+import com.google.android.material.snackbar.Snackbar;
 import com.google.android.material.textfield.TextInputLayout;
+import com.google.firebase.FirebaseNetworkException;
 import com.google.firebase.auth.EmailAuthProvider;
 
 import androidx.annotation.NonNull;
@@ -150,6 +152,11 @@ protected void onFailure(@NonNull Exception e) {
                         && ((FirebaseUiException) e).getErrorCode() == ErrorCodes.DEVELOPER_ERROR) {
                     mListener.onDeveloperFailure(e);
                 }
+
+                if (e instanceof FirebaseNetworkException) {
+                    Snackbar.make(getView(), getString(R.string.fui_no_internet), Snackbar.LENGTH_SHORT).show();
+                }
+
                 // Otherwise just let the user enter their data
             }
         });

auth/src/main/java/com/firebase/ui/auth/ui/idp/AuthMethodPickerActivity.java

@@ -47,6 +47,7 @@
 import com.firebase.ui.auth.viewmodel.ProviderSignInBase;
 import com.firebase.ui.auth.viewmodel.ResourceObserver;
 import com.firebase.ui.auth.viewmodel.idp.SocialProviderResponseHandler;
+import com.google.android.material.snackbar.Snackbar;
 import com.google.firebase.FirebaseApp;
 import com.google.firebase.auth.EmailAuthProvider;
 import com.google.firebase.auth.FacebookAuthProvider;
@@ -362,7 +363,7 @@ private void handleResponse(@NonNull IdpResponse response) {
             @Override
             public void onClick(View view) {
                 if (isOffline()) {
-                    Toast.makeText(AuthMethodPickerActivity.this, getString(R.string.fui_no_internet), Toast.LENGTH_SHORT).show();
+                    Snackbar.make(findViewById(android.R.id.content), getString(R.string.fui_no_internet), Snackbar.LENGTH_SHORT).show();
                     return;
                 }