show an explanation dialog to users that came from the free version

Author: tibbi

app/src/main/AndroidManifest.xml

@@ -22,6 +22,11 @@
         android:name="android.hardware.telephony"
         android:required="false" />
 
+    <queries>
+        <package android:name="com.simplemobiletools.contacts.debug" />
+        <package android:name="com.simplemobiletools.contacts" />
+    </queries>
+
     <application
         android:name=".App"
         android:allowBackup="true"

app/src/main/kotlin/com/simplemobiletools/contacts/pro/activities/MainActivity.kt

@@ -14,6 +14,7 @@ import android.widget.ImageView
 import android.widget.TextView
 import android.widget.Toast
 import androidx.viewpager.widget.ViewPager
+import com.simplemobiletools.commons.dialogs.ConfirmationDialog
 import com.simplemobiletools.commons.dialogs.FilePickerDialog
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.*
@@ -151,6 +152,12 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
 
         isFirstResume = false
         checkShortcuts()
+
+        /if (!config.wasUpgradedFromFreeShown && isPackageInstalled("com.simplemobiletools.contacts")) {
+            val dialogText = getString(R.string.upgraded_to_pro_contacts, getString(R.string.phone_storage_hidden))
+            ConfirmationDialog(this, dialogText, 0, R.string.ok, 0, false) {}
+            config.wasUpgradedFromFreeShown = true
+        }
     }
 
     override fun onPause() {