show a loading progress bar at first app load

Author: tibbi

app/src/main/kotlin/com/simplemobiletools/smsmessenger/activities/MainActivity.kt

@@ -114,6 +114,8 @@ class MainActivity : SimpleActivity() {
         no_conversations_placeholder_2.setTextColor(properPrimaryColor)
         no_conversations_placeholder_2.underlineText()
         conversations_fastscroller.updateColors(properPrimaryColor)
+        conversations_progress_bar.setIndicatorColor(properPrimaryColor)
+        conversations_progress_bar.trackColor = properPrimaryColor.adjustAlpha(LOWER_ALPHA)
         checkShortcut()
         (conversations_fab?.layoutParams as? CoordinatorLayout.LayoutParams)?.bottomMargin =
             navigationBarHeight + resources.getDimension(R.dimen.activity_margin).toInt()
@@ -361,6 +363,9 @@ class MainActivity : SimpleActivity() {
         if (!hasConversations && config.appRunCount == 1) {
             no_conversations_placeholder.text = getString(R.string.loading_messages)
             no_conversations_placeholder_2.beGone()
+            conversations_progress_bar.beVisible()
+        } else {
+            conversations_progress_bar.beGone()
         }
 
         try {

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

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/main_coordinator"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
@@ -28,6 +29,18 @@
                 android:layout_width="match_parent"
                 android:layout_height="match_parent">
 
+                <com.google.android.material.progressindicator.LinearProgressIndicator
+                    android:id="@+id/conversations_progress_bar"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_alignParentTop="true"
+                    android:indeterminate="true"
+                    android:visibility="gone"
+                    app:hideAnimationBehavior="outward"
+                    app:showAnimationBehavior="inward"
+                    app:showDelay="250"
+                    tools:visibility="visible" />
+
                 <com.simplemobiletools.commons.views.MyTextView
                     android:id="@+id/no_conversations_placeholder"
                     android:layout_width="match_parent"