allow customizing the default tab to open at app start

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

@@ -340,7 +340,7 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
 
     private fun setupTabColors() {
         handledShowTabs = config.showTabs
-        val lastUsedPage = config.lastUsedViewPagerPage
+        val lastUsedPage = getDefaultTab()
         main_tabs_holder.apply {
             background = ColorDrawable(config.backgroundColor)
             setSelectedTabIndicatorColor(getAdjustedPrimaryColor())
@@ -406,14 +406,14 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
                 skippedTabs++
             } else {
                 val tab = main_tabs_holder.newTab().setIcon(getTabIcon(index))
-                main_tabs_holder.addTab(tab, index - skippedTabs, config.lastUsedViewPagerPage == index - skippedTabs)
+                main_tabs_holder.addTab(tab, index - skippedTabs, getDefaultTab() == index - skippedTabs)
             }
         }
 
         // selecting the proper tab sometimes glitches, add an extra selector to make sure we have it right
         main_tabs_holder.onGlobalLayout {
             Handler().postDelayed({
-                main_tabs_holder.getTabAt(config.lastUsedViewPagerPage)?.select()
+                main_tabs_holder.getTabAt(getDefaultTab())?.select()
                 invalidateOptionsMenu()
             }, 100L)
         }
@@ -563,7 +563,7 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
 
         if (viewpager.adapter == null) {
             viewpager.adapter = ViewPagerAdapter(this, tabsList, config.showTabs)
-            viewpager.currentItem = config.lastUsedViewPagerPage
+            viewpager.currentItem = getDefaultTab()
         }
 
         ContactsHelper(this).getContacts { contacts ->
@@ -595,6 +595,15 @@ class MainActivity : SimpleActivity(), RefreshContactsListener {
 
     private fun getAllFragments() = arrayListOf(contacts_fragment, favorites_fragment, groups_fragment)
 
+    private fun getDefaultTab(): Int {
+        return when (config.defaultTab) {
+            TAB_LAST_USED -> config.lastUsedViewPagerPage
+            TAB_CONTACTS -> 0
+            TAB_FAVORITES -> 1
+            else -> 2
+        }
+    }
+
     private fun checkDialerMigrationDialog() {
         if (config.appRunCount < 3) {
             config.wasDialerMigrationShown = true

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

@@ -3,13 +3,11 @@ package com.simplemobiletools.contacts.pro.activities
 import android.os.Bundle
 import android.view.Menu
 import com.simplemobiletools.commons.dialogs.RadioGroupDialog
+import com.simplemobiletools.commons.extensions.baseConfig
 import com.simplemobiletools.commons.extensions.beVisibleIf
 import com.simplemobiletools.commons.extensions.getFontSizeText
 import com.simplemobiletools.commons.extensions.updateTextColors
-import com.simplemobiletools.commons.helpers.FONT_SIZE_EXTRA_LARGE
+import com.simplemobiletools.commons.helpers.*
-import com.simplemobiletools.commons.helpers.FONT_SIZE_LARGE
-import com.simplemobiletools.commons.helpers.FONT_SIZE_MEDIUM
-import com.simplemobiletools.commons.helpers.FONT_SIZE_SMALL
 import com.simplemobiletools.commons.models.RadioItem
 import com.simplemobiletools.contacts.pro.R
 import com.simplemobiletools.contacts.pro.dialogs.ManageVisibleFieldsDialog
@@ -43,6 +41,7 @@ class SettingsActivity : SimpleActivity() {
         setupShowDialpadButton()
         setupShowPrivateContacts()
         setupOnContactClick()
+        setupDefaultTab()
         updateTextColors(settings_holder)
         invalidateOptionsMenu()
     }
@@ -70,6 +69,29 @@ class SettingsActivity : SimpleActivity() {
         }
     }
 
+    private fun setupDefaultTab() {
+        settings_default_tab.text = getDefaultTabText()
+        settings_default_tab_holder.setOnClickListener {
+            val items = arrayListOf(
+                RadioItem(TAB_CONTACTS, getString(R.string.contacts_tab)),
+                RadioItem(TAB_FAVORITES, getString(R.string.favorites_tab)),
+                RadioItem(TAB_GROUPS, getString(R.string.groups_tab)),
+                RadioItem(TAB_LAST_USED, getString(R.string.last_used_tab)))
+
+            RadioGroupDialog(this@SettingsActivity, items, config.defaultTab) {
+                config.defaultTab = it as Int
+                settings_default_tab.text = getDefaultTabText()
+            }
+        }
+    }
+
+    private fun getDefaultTabText() = getString(when (baseConfig.defaultTab) {
+        TAB_CONTACTS -> R.string.contacts_tab
+        TAB_FAVORITES -> R.string.favorites_tab
+        TAB_GROUPS -> R.string.groups_tab
+        else -> R.string.last_used_tab
+    })
+
     private fun setupFontSize() {
         settings_font_size.text = getFontSizeText()
         settings_font_size_holder.setOnClickListener {

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

@@ -97,6 +97,38 @@
 
         </RelativeLayout>
 
+        <RelativeLayout
+            android:id="@+id/settings_default_tab_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:paddingLeft="@dimen/normal_margin"
+            android:paddingTop="@dimen/activity_margin"
+            android:paddingRight="@dimen/normal_margin"
+            android:paddingBottom="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MyTextView
+                android:id="@+id/settings_default_tab_label"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_centerVertical="true"
+                android:layout_toStartOf="@+id/settings_default_tab"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingRight="@dimen/medium_margin"
+                android:text="@string/default_tab_to_open" />
+
+            <com.simplemobiletools.commons.views.MyTextView
+                android:id="@+id/settings_default_tab"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_alignParentEnd="true"
+                android:layout_marginEnd="@dimen/medium_margin"
+                android:background="@null"
+                android:clickable="false" />
+
+        </RelativeLayout>
+
         <RelativeLayout
             android:id="@+id/settings_font_size_holder"
             android:layout_width="match_parent"