优化

app/src/main/java/io/legado/app/ui/main/MainActivity.kt

@@ -170,33 +170,37 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
     private inner class TabFragmentPageAdapter(fm: FragmentManager) :
         FragmentStatePagerAdapter(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
 
-        private fun getBookshelfFragment(): Fragment {
-            if (!fragmentMap.containsKey(0)) {
-                fragmentMap[0] = BookshelfFragment()
+        val bookshelfFragment: Fragment
+            get() {
+                if (!fragmentMap.containsKey(0)) {
+                    fragmentMap[0] = BookshelfFragment()
+                }
+                return fragmentMap.getValue(0)
             }
-            return fragmentMap.getValue(0)
-        }
 
-        private fun getExploreFragment(): Fragment {
-            if (!fragmentMap.containsKey(1)) {
-                fragmentMap[1] = ExploreFragment()
+        val exploreFragment: Fragment
+            get() {
+                if (!fragmentMap.containsKey(1)) {
+                    fragmentMap[1] = ExploreFragment()
+                }
+                return fragmentMap.getValue(1)
             }
-            return fragmentMap.getValue(1)
-        }
 
-        private fun getRssFragment(): Fragment {
-            if (!fragmentMap.containsKey(2)) {
-                fragmentMap[2] = RssFragment()
+        val rssFragment: Fragment
+            get() {
+                if (!fragmentMap.containsKey(2)) {
+                    fragmentMap[2] = RssFragment()
+                }
+                return fragmentMap.getValue(2)
             }
-            return fragmentMap.getValue(2)
-        }
 
-        private fun getMyFragment(): Fragment {
-            if (!fragmentMap.containsKey(3)) {
-                fragmentMap[3] = MyFragment()
+        val myFragment: Fragment
+            get() {
+                if (!fragmentMap.containsKey(3)) {
+                    fragmentMap[3] = MyFragment()
+                }
+                return fragmentMap.getValue(3)
             }
-            return fragmentMap.getValue(3)
-        }
 
         override fun getItemPosition(`object`: Any): Int {
             return POSITION_NONE
@@ -204,14 +208,10 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
 
         override fun getItem(position: Int): Fragment {
             return when (position) {
-                0 -> getBookshelfFragment()
-                1 -> getExploreFragment()
-                2 -> if (AppConfig.isShowRSS) {
-                    getRssFragment()
-                } else {
-                    getMyFragment()
-                }
-                else -> getMyFragment()
+                0 -> bookshelfFragment
+                1 -> exploreFragment
+                2 -> if (AppConfig.isShowRSS) rssFragment else myFragment
+                else -> myFragment
             }
         }