Show toast when no calendars found

src/main/java/org/tasks/activities/CalendarSelectionDialog.java

@@ -1,9 +1,11 @@
 package org.tasks.activities;
 
 import android.app.Dialog;
+import android.content.Context;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
+import android.widget.Toast;
 
 import com.google.common.base.Function;
 
@@ -13,6 +15,7 @@ import org.tasks.calendars.CalendarProvider;
 import org.tasks.dialogs.AlertDialogBuilder;
 import org.tasks.dialogs.DialogBuilder;
 import org.tasks.injection.DialogFragmentComponent;
+import org.tasks.injection.ForActivity;
 import org.tasks.injection.InjectingDialogFragment;
 
 import java.util.List;
@@ -39,6 +42,7 @@ public class CalendarSelectionDialog extends InjectingDialogFragment {
 
     @Inject DialogBuilder dialogBuilder;
     @Inject CalendarProvider calendarProvider;
+    @Inject @ForActivity Context context;
     private CalendarSelectionHandler handler;
     private boolean enableNone;
 
@@ -53,6 +57,11 @@ public class CalendarSelectionDialog extends InjectingDialogFragment {
             }
         });
 
+        if (calendarNames.isEmpty()) {
+            Toast.makeText(context, R.string.no_calendars_found, Toast.LENGTH_LONG).show();
+            handler.dismiss();
+        }
+
         AlertDialogBuilder builder = dialogBuilder.newDialog()
                 .setItems(calendarNames, new DialogInterface.OnClickListener() {
                     @Override

src/main/java/org/tasks/injection/DialogFragmentModule.java

@@ -1,6 +1,7 @@
 package org.tasks.injection;
 
 import android.app.Activity;
+import android.content.Context;
 import android.support.v4.app.DialogFragment;
 
 import dagger.Module;
@@ -18,4 +19,10 @@ public class DialogFragmentModule {
     public Activity getActivity() {
         return dialogFragment.getActivity();
     }
+
+    @Provides
+    @ForActivity
+    public Context getContext() {
+        return dialogFragment.getActivity();
+    }
 }

src/main/res/values/strings.xml

@@ -905,5 +905,6 @@ File %1$s contained %2$s.\n\n
   <string name="led_notification">LED Notification</string>
   <string name="hardware_support_required">Hardware support required</string>
   <string name="led_color">LED color</string>
+  <string name="no_calendars_found">No calendars found</string>
 
 </resources>