add a fastscroller if needed

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

@@ -62,6 +62,12 @@ class MainActivity : SimpleActivity(), RefreshRecyclerViewListener {
         }
 
         updateTextColors(coordinator_layout)
+
+        launchers_fastscroller.apply {
+            updatePrimaryColor()
+            updateBubbleColors()
+            allowBubbleDisplay = config.showInfoBubble
+        }
     }
 
     override fun onPause() {
@@ -100,7 +106,7 @@ class MainActivity : SimpleActivity(), RefreshRecyclerViewListener {
     private fun setupLaunchers() {
         displayedLaunchers = dbHelper.getLaunchers()
         checkInvalidApps()
-        val adapter = LaunchersAdapter(this, displayedLaunchers, this, launchers_grid) {
+        val adapter = LaunchersAdapter(this, displayedLaunchers, this, launchers_grid, launchers_fastscroller) {
             val launchIntent = packageManager.getLaunchIntentForPackage((it as AppLauncher).packageName)
             if (launchIntent != null) {
                 startActivity(launchIntent)
@@ -112,6 +118,12 @@ class MainActivity : SimpleActivity(), RefreshRecyclerViewListener {
             }
         }
         launchers_grid.adapter = adapter
+
+        launchers_fastscroller.allowBubbleDisplay = config.showInfoBubble
+        launchers_fastscroller.setViews(launchers_grid) {
+            launchers_fastscroller.updateBubbleText(displayedLaunchers.getOrNull(it)?.getBubbleText() ?: "")
+        }
+
         fillNotDisplayedLaunchers()
     }
 

app/src/main/kotlin/com/simplemobiletools/applauncher/activities/SettingsActivity.kt

@@ -21,6 +21,7 @@ class SettingsActivity : SimpleActivity() {
         setupCustomizeColors()
         setupUseEnglish()
         setupAvoidWhatsNew()
+        setupShowInfoBubble()
         updateTextColors(settings_holder)
     }
 
@@ -47,4 +48,12 @@ class SettingsActivity : SimpleActivity() {
             config.avoidWhatsNew = settings_avoid_whats_new.isChecked
         }
     }
+
+    private fun setupShowInfoBubble() {
+        settings_show_info_bubble.isChecked = config.showInfoBubble
+        settings_show_info_bubble_holder.setOnClickListener {
+            settings_show_info_bubble.toggle()
+            config.showInfoBubble = settings_show_info_bubble.isChecked
+        }
+    }
 }

app/src/main/kotlin/com/simplemobiletools/applauncher/adapters/LaunchersAdapter.kt

@@ -14,12 +14,14 @@ import com.simplemobiletools.commons.dialogs.ConfirmationDialog
 import com.simplemobiletools.commons.extensions.applyColorFilter
 import com.simplemobiletools.commons.extensions.beInvisibleIf
 import com.simplemobiletools.commons.interfaces.RefreshRecyclerViewListener
+import com.simplemobiletools.commons.views.FastScroller
 import com.simplemobiletools.commons.views.MyRecyclerView
 import kotlinx.android.synthetic.main.item_app_launcher.view.*
 import java.util.*
 
 class LaunchersAdapter(activity: SimpleActivity, val launchers: MutableList<AppLauncher>, val listener: RefreshRecyclerViewListener?,
-                       recyclerView: MyRecyclerView, itemClick: (Any) -> Unit) : MyRecyclerViewAdapter(activity, recyclerView, null, itemClick) {
+                       recyclerView: MyRecyclerView, fastScroller: FastScroller, itemClick: (Any) -> Unit) :
+        MyRecyclerViewAdapter(activity, recyclerView, fastScroller, itemClick) {
 
     init {
         setupDragListener(true)

app/src/main/kotlin/com/simplemobiletools/applauncher/models/AppLauncher.kt

@@ -4,4 +4,6 @@ import android.graphics.drawable.Drawable
 
 data class AppLauncher(val id: Int, var name: String, val packageName: String, val drawable: Drawable? = null) {
     override fun equals(other: Any?) = packageName.equals((other as AppLauncher).packageName, true)
+
+    fun getBubbleText() = name
 }

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

@@ -6,6 +6,11 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <RelativeLayout
+        android:id="@+id/launchers_holder"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
         <com.simplemobiletools.commons.views.MyRecyclerView
             android:id="@+id/launchers_grid"
             android:layout_width="match_parent"
@@ -16,6 +21,22 @@
             app:layoutManager="com.simplemobiletools.commons.views.MyGridLayoutManager"
             app:spanCount="@integer/columns"/>
 
+        <com.simplemobiletools.commons.views.FastScroller
+            android:id="@+id/launchers_fastscroller"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_alignBottom="@+id/launchers_grid"
+            android:layout_alignParentEnd="true"
+            android:layout_alignParentRight="true"
+            android:layout_alignTop="@+id/launchers_grid"
+            android:paddingLeft="@dimen/normal_margin"
+            android:paddingStart="@dimen/normal_margin">
+
+            <include layout="@layout/fastscroller_handle_vertical"/>
+
+        </com.simplemobiletools.commons.views.FastScroller>
+    </RelativeLayout>
+
     <com.simplemobiletools.commons.views.MyFloatingActionButton
         android:id="@+id/fab"
         android:layout_width="wrap_content"

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

@@ -72,5 +72,28 @@
                 android:text="@string/avoid_whats_new"/>
 
         </RelativeLayout>
+
+        <RelativeLayout
+            android:id="@+id/settings_show_info_bubble_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:paddingBottom="@dimen/activity_margin"
+            android:paddingLeft="@dimen/normal_margin"
+            android:paddingRight="@dimen/normal_margin"
+            android:paddingTop="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_show_info_bubble"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/show_info_bubble"/>
+
+        </RelativeLayout>
     </LinearLayout>
 </ScrollView>