diff --git a/app/src/main/java/com/wbrawner/simplemarkdown/view/adapter/EditPagerAdapter.kt b/app/src/main/java/com/wbrawner/simplemarkdown/view/adapter/EditPagerAdapter.kt
index 42f5b55..6e1dc60 100644
--- a/app/src/main/java/com/wbrawner/simplemarkdown/view/adapter/EditPagerAdapter.kt
+++ b/app/src/main/java/com/wbrawner/simplemarkdown/view/adapter/EditPagerAdapter.kt
@@ -1,28 +1,22 @@
 package com.wbrawner.simplemarkdown.view.adapter
 
-/**
- * Created by billy on 7/29/2017.
- */
-
 import android.content.Context
 import android.content.res.Configuration
-
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.FragmentPagerAdapter
-
 import com.wbrawner.simplemarkdown.R
 import com.wbrawner.simplemarkdown.view.fragment.EditFragment
 import com.wbrawner.simplemarkdown.view.fragment.PreviewFragment
 
-class EditPagerAdapter(fm: FragmentManager, private val mContext: Context) : FragmentPagerAdapter(fm) {
+class EditPagerAdapter(fm: FragmentManager, private val context: Context) : FragmentPagerAdapter(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
 
     override fun getItem(position: Int): Fragment {
-        when (position) {
-            FRAGMENT_EDIT -> return EditFragment()
-            FRAGMENT_PREVIEW -> return PreviewFragment()
+        return when (position) {
+            FRAGMENT_EDIT -> EditFragment()
+            FRAGMENT_PREVIEW -> PreviewFragment()
+            else -> throw IllegalStateException("Attempting to get fragment for invalid page number")
         }
-        return null
     }
 
     override fun getCount(): Int {
@@ -35,18 +29,20 @@ class EditPagerAdapter(fm: FragmentManager, private val mContext: Context) : Fra
             FRAGMENT_EDIT -> stringId = R.string.action_edit
             FRAGMENT_PREVIEW -> stringId = R.string.action_preview
         }
-        return mContext.getString(stringId)
+        return context.getString(stringId)
     }
 
     override fun getPageWidth(position: Int): Float {
-        return if (mContext.resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+        return if (context.resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
             0.5f
-        } else super.getPageWidth(position)
+        } else {
+            super.getPageWidth(position)
+        }
     }
 
     companion object {
-        val FRAGMENT_EDIT = 0
-        val FRAGMENT_PREVIEW = 1
-        val NUM_PAGES = 2
+        const val FRAGMENT_EDIT = 0
+        const val FRAGMENT_PREVIEW = 1
+        const val NUM_PAGES = 2
     }
 }