上传Android项目

app/src/main/java/com/example/myapplication/MainActivity.kt

@@ -0,0 +1,47 @@
+package com.example.myapplication
+
+import android.os.Bundle
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
+import androidx.navigation.fragment.NavHostFragment
+import androidx.navigation.ui.setupWithNavController
+import com.google.android.material.bottomnavigation.BottomNavigationView
+import androidx.navigation.NavController
+import androidx.navigation.NavDestination
+
+class MainActivity : AppCompatActivity() {
+
+    private lateinit var bottomNav: BottomNavigationView
+    private lateinit var navController: NavController
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        // 1. 找到 NavHostFragment
+        val navHostFragment =
+            supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
+        navController = navHostFragment.navController
+
+        // 2. 找到 BottomNavigationView
+        bottomNav = findViewById(R.id.bottom_nav)
+
+        // 3. 绑定导航控制器（负责切换 Fragment、保持选中状态）
+        bottomNav.setupWithNavController(navController)
+
+        // 4. 取消图标颜色 tint —— 使用原图标颜色
+        bottomNav.itemIconTintList = null
+
+        // 5. 添加导航监听（用于某些 Fragment 隐藏底部导航栏）
+        navController.addOnDestinationChangedListener { _, destination, _ ->
+            when (destination.id) {
+                R.id.rechargeFragment, R.id.goldCoinRechargeFragment,R.id.PersonalSettings,R.id.MySkin,R.id.searchFragment,R.id.MyKeyboard,R.id.searchResultFragment,R.id.keyboardDetailFragment,R.id.feedbackFragment,R.id.notificationFragment-> {
+                    bottomNav.visibility = View.GONE
+                }
+                else -> {
+                    bottomNav.visibility = View.VISIBLE
+                }
+            }
+        }
+    }
+}