【修复】修复首页删除与搜索模式下的侧滑返回问题。

app/src/main/java/com/base/pdfviewerscannerwhite/ui/main/DocumentFragment.kt

@@ -244,7 +244,7 @@ class DocumentFragment(
     fun changeSelectUI(show: Boolean) {
         if (show) {
             binding.viewPager2.isUserInputEnabled = false
-            (requireActivity() as MainActivity).callback.isEnabled = true
+            //(requireActivity() as MainActivity).callback.isEnabled = true
             uiMode = UI_MODE_SELECT
 
             binding.ivPaixu.visibility = View.INVISIBLE
@@ -260,7 +260,7 @@ class DocumentFragment(
             currentPage.changeSelectUi(true)
         } else {
             binding.viewPager2.isUserInputEnabled = true
-            (requireActivity() as MainActivity).callback.isEnabled = false
+           // (requireActivity() as MainActivity).callback.isEnabled = false
             uiMode = UI_MODE_NORMAL
             binding.flFanhui.visibility = View.INVISIBLE
             binding.ivAllSelector.visibility = View.INVISIBLE
@@ -288,7 +288,7 @@ class DocumentFragment(
     fun changeSearchUI(show: Boolean) {
         if (show) {
             uiMode = UI_MODE_SEARCH
-            (requireActivity() as MainActivity).callback.isEnabled = true
+           // (requireActivity() as MainActivity).callback.isEnabled = true
 
             binding.card.elevation = 0f
             binding.tvTittle.visibility = View.INVISIBLE
@@ -308,7 +308,7 @@ class DocumentFragment(
 
         } else {
             uiMode = UI_MODE_NORMAL
-            (requireActivity() as MainActivity).callback.isEnabled = false
+           // (requireActivity() as MainActivity).callback.isEnabled = false
 
             binding.card.elevation = resources.getDimension(R.dimen.dp_5)
             binding.editSearch.visibility = View.INVISIBLE

app/src/main/java/com/base/pdfviewerscannerwhite/ui/main/MainActivity.kt

@@ -326,18 +326,9 @@ class MainActivity : BaseActivity<ActivityMainBinding>(), MainView {
     var isBookmarkAdd: Boolean = false
     var isToolAdd: Boolean = false
 
-    @SuppressLint("MissingSuperCall")
-    override fun onBackPressed() {
-        LogEx.logDebug(TAG, "onBackPressed")
-        showAppExitDialog()
-    }
-
     //OnBackPressedCallback 并将 isEnabled 设置为 false 时，默认的返回键行为将被禁用。
-    lateinit var callback: OnBackPressedCallback
-    override fun initListener() {
-        super.initListener()
-
-        callback = object : OnBackPressedCallback(false) {
+    val callback: OnBackPressedCallback by lazy(LazyThreadSafetyMode.NONE) {
+        object : OnBackPressedCallback(true) {
             override fun handleOnBackPressed() {
                 LogEx.logDebug(TAG, "handleOnBackPressed")
                 if (currentFragment is DocumentFragment) {
@@ -345,13 +336,20 @@ class MainActivity : BaseActivity<ActivityMainBinding>(), MainView {
                     LogEx.logDebug(TAG, "handleOnBackPressed uiMode=${documentFragment.uiMode}")
                     if (documentFragment.uiMode == ConstObject.UI_MODE_SELECT) {
                         documentFragment.changeSelectUI(false)
+                        return
                     }
                     if (documentFragment.uiMode == ConstObject.UI_MODE_SEARCH) {
                         documentFragment.changeSearchUI(false)
+                        return
                     }
                 }
+                showAppExitDialog()
             }
         }
+    }
+
+    override fun initListener() {
+        super.initListener()
         onBackPressedDispatcher.addCallback(callback)
 
         binding.llDocument.setOnClickListener {