Added a "Retry" button when the connection issue happened. | Close #67.

Author: DenBond7

FlowCrypt/src/main/java/com/flowcrypt/email/ui/activity/fragment/EmailListFragment.java

@@ -27,6 +27,7 @@
 import com.flowcrypt.email.R;
 import com.flowcrypt.email.api.email.Folder;
 import com.flowcrypt.email.api.email.model.GeneralMessageDetails;
+import com.flowcrypt.email.api.email.sync.SyncErrorTypes;
 import com.flowcrypt.email.database.dao.source.imap.AttachmentDaoSource;
 import com.flowcrypt.email.database.dao.source.imap.MessageDaoSource;
 import com.flowcrypt.email.ui.activity.MessageDetailsActivity;
@@ -299,7 +300,7 @@ public void onScroll(AbsListView view, int firstVisibleItem,
     }
 
     @Override
-    public void onErrorOccurred(int requestCode, int errorType, Exception e) {
+    public void onErrorOccurred(final int requestCode, int errorType, Exception e) {
         super.onErrorOccurred(requestCode, errorType, e);
         switch (requestCode) {
             case R.id.syns_request_code_load_next_messages:
@@ -315,6 +316,24 @@ public void onErrorOccurred(int requestCode, int errorType, Exception e) {
 
         getLoaderManager().destroyLoader(R.id.loader_id_load_gmail_messages);
         cleanCache();
+
+        switch (errorType) {
+            case SyncErrorTypes.CONNECTION_TO_STORE_IS_LOST:
+                showSnackbar(getView(), getString(R.string.can_not_connect_to_the_imap_server), getString(R.string
+                        .retry), new View.OnClickListener() {
+                    @Override
+                    public void onClick(View v) {
+                        switch (requestCode) {
+                            case R.id.syns_request_code_load_next_messages:
+                            case R.id.syns_request_code_force_load_new_messages:
+                                UIUtil.exchangeViewVisibility(getContext(), true, progressView, statusView);
+                                loadNextMessages(-1);
+                                break;
+                        }
+                    }
+                });
+                break;
+        }
     }
 
     /**
@@ -353,6 +372,7 @@ public void onForceLoadNewMessagesCompleted(boolean needToRefreshList) {
     public void onNextMessagesLoaded(boolean isNeedToUpdateList) {
         lastPositionOfAlreadyLoaded = lastCalledPositionForLoadMore;
         footerProgressView.setVisibility(View.GONE);
+        progressView.setVisibility(View.GONE);
         if (isNeedToUpdateList || messageListAdapter.getCount() == 0) {
             updateList(false);
         } else {

FlowCrypt/src/main/java/com/flowcrypt/email/ui/activity/fragment/MessageDetailsFragment.java

@@ -34,6 +34,7 @@
 import com.flowcrypt.email.api.email.model.AttachmentInfo;
 import com.flowcrypt.email.api.email.model.GeneralMessageDetails;
 import com.flowcrypt.email.api.email.model.IncomingMessageInfo;
+import com.flowcrypt.email.api.email.sync.SyncErrorTypes;
 import com.flowcrypt.email.database.dao.source.ContactsDaoSource;
 import com.flowcrypt.email.database.dao.source.imap.AttachmentDaoSource;
 import com.flowcrypt.email.js.PgpContact;
@@ -225,10 +226,25 @@ public void onClick(View v) {
     }
 
     @Override
-    public void onErrorOccurred(int requestCode, int errorType, Exception e) {
+    public void onErrorOccurred(final int requestCode, int errorType, Exception e) {
         super.onErrorOccurred(requestCode, errorType, e);
         isAdditionalActionEnable = true;
         getActivity().invalidateOptionsMenu();
+
+        switch (errorType) {
+            case SyncErrorTypes.CONNECTION_TO_STORE_IS_LOST:
+                showSnackbar(getView(), getString(R.string.failed_load_message_from_email_server),
+                        getString(R.string.retry), new View.OnClickListener() {
+                            @Override
+                            public void onClick(View v) {
+                                UIUtil.exchangeViewVisibility(getContext(), true, progressView, statusView);
+                                ((BaseSyncActivity) getBaseActivity()).loadMessageDetails(
+                                        R.id.syns_request_code_load_message_details, folder,
+                                        generalMessageDetails.getUid());
+                            }
+                        });
+                break;
+        }
     }
 
     /**

FlowCrypt/src/main/java/com/flowcrypt/email/ui/activity/fragment/base/BaseGmailFragment.java

@@ -8,6 +8,7 @@
 
 import android.os.Bundle;
 import android.support.annotation.Nullable;
+import android.text.TextUtils;
 import android.view.View;
 import android.widget.TextView;
 
@@ -58,7 +59,21 @@ public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
      */
     public void onErrorOccurred(int requestCode, int errorType, Exception e) {
         getContentView().setVisibility(View.GONE);
-        textViewStatusInfo.setText(R.string.there_was_syncing_problem);
+
+        switch (errorType) {
+            case SyncErrorTypes.CONNECTION_TO_STORE_IS_LOST:
+                textViewStatusInfo.setText(R.string.there_was_syncing_problem);
+                break;
+
+            default:
+                if (e != null && !TextUtils.isEmpty(e.getMessage())) {
+                    textViewStatusInfo.setText(e.getMessage());
+                } else {
+                    textViewStatusInfo.setText(R.string.unknown_error);
+                }
+                break;
+        }
+
         UIUtil.exchangeViewVisibility(getContext(), false, progressView, statusView);
         if (getSnackBar() != null) {
             getSnackBar().dismiss();

FlowCrypt/src/main/res/values/strings.xml

@@ -154,4 +154,6 @@
     <string name="public_">Public</string>
     <string name="message_was_moved_to_inbox">The message was moved to inbox</string>
     <string name="attachment">Attachment</string>
+    <string name="can_not_connect_to_the_imap_server">Can not connect to the IMAP server</string>
+    <string name="failed_load_message_from_email_server">Failed to load a message from the email server</string>
 </resources>