Tasks collection view: add a warning about tasks not showing without OpenTasks.

Related to #105 (though not a fix...).

app/src/main/java/com/etesync/syncadapter/ui/ViewCollectionActivity.kt

@@ -69,6 +69,8 @@ class ViewCollectionActivity : BaseActivity(), Refreshable {
             }
             CollectionInfo.Type.TASKS -> {
                 colorSquare.setBackgroundColor(info.color ?: LocalCalendar.defaultColor)
+                val tasksNotShowing = findViewById<View>(R.id.tasks_not_showing)
+                tasksNotShowing.visibility = View.VISIBLE
             }
             CollectionInfo.Type.ADDRESS_BOOK -> {
                 colorSquare.visibility = View.GONE

app/src/main/res/layout/view_collection_activity.xml

@@ -17,10 +17,18 @@
         <TextView
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:padding="@dimen/activity_margin"
+            android:paddingHorizontal="@dimen/activity_margin"
             android:text="@string/change_journal_title"
             android:textAppearance="?android:attr/textAppearanceMedium" />
 
+        <TextView
+            android:id="@+id/tasks_not_showing"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingHorizontal="@dimen/activity_margin"
+            android:visibility="gone"
+            android:text="@string/tasks_not_showing" />
+
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"

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

@@ -134,6 +134,7 @@
 
     <!-- ViewCollection -->
     <string name="change_journal_title">Change Journal</string>
+    <string name="tasks_not_showing">* Log is only shown if OpenTasks is installed. We are working on a fix.</string>
     <string name="account_showcase_import">In order to import contacts and calendars into EteSync, you need to click on the menu, and choose \"Import\".</string>
     <string name="account_owner">Owner: %s</string>
     <string name="members_owner_only">Only the owner of this collection (%s) is allowed to view its members.</string>