3530: Provide a help text on the empty conversations view (#3531)

Fixes #3530

app/src/main/java/com/keylesspalace/tusky/ListsActivity.kt

@@ -192,6 +192,7 @@ class ListsActivity : BaseActivity(), Injectable, HasAndroidInjector {
                         R.string.message_empty,
                         null
                     )
+                    binding.messageView.showHelp(R.string.help_empty_lists)
                 } else {
                     binding.messageView.hide()
                 }

app/src/main/java/com/keylesspalace/tusky/components/conversation/ConversationsFragment.kt

@@ -134,6 +134,7 @@ class ConversationsFragment :
                         if (loadState.append is LoadState.NotLoading && loadState.source.refresh is LoadState.NotLoading) {
                             binding.statusView.show()
                             binding.statusView.setup(R.drawable.elephant_friend_empty, R.string.message_empty, null)
+                            binding.statusView.showHelp(R.string.help_empty_conversations)
                         }
                     }
                     is LoadState.Error -> {

app/src/main/java/com/keylesspalace/tusky/view/BackgroundMessageView.kt

@@ -61,6 +61,7 @@ class BackgroundMessageView @JvmOverloads constructor(
         binding.imageView.setImageResource(imageRes)
         binding.button.setOnClickListener(clickListener)
         binding.button.visible(clickListener != null)
+        binding.helpText.visible(false)
     }
 
     fun showHelp(@StringRes helpRes: Int) {

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

@@ -813,6 +813,18 @@
         you follow.\n\nTo explore accounts you can either discover them in one of the other timelines.
         For example the local timeline of your instance [iconics gmd_group]. Or you can search them
         by name [iconics gmd_search]; for example search for Tusky to find our Mastodon account.</string>
+    <string name="help_empty_conversations">Here are your <b>private messages</b>; sometimes called conversations or direct messages (DM).
+        \n\nPrivate messages are created by setting the visibility [iconics gmd_public] of a post to [iconics gmd_mail] <i>Direct</i> and
+        mentioning one or more users in the text.
+        \n\nFor example you can start on the profile view of an account and tap the create button [iconics gmd_edit] and change the visibility.
+    </string>
+    <string name="help_empty_lists">This is your <b>lists view</b>. You can define a number of private lists and add accounts to that.
+        \n\n
+        NOTE that you can only add accounts you follow to your lists.
+        \n\n
+        These lists can be used as a tab in Account preferences [iconics gmd_account_circle] [iconics gmd_navigate_next] Tabs.
+    </string>
+
     <string name="load_newest_notifications">Load newest notifications</string>
     <string name="about_copy">Copy version and device information</string>
     <string name="about_copied">Copied version and device information</string>