updated post

app/build.gradle.kts

@@ -63,6 +63,7 @@ dependencies {
     implementation(libs.play.services.location)
     implementation(libs.androidx.recyclerview)
     implementation(libs.androidx.media3.ui)
+    implementation(libs.firebase.database.ktx)
     val room_version = "2.6.1"
     val lifecycle_version = "2.8.1"
     val mediaVersion = "1.3.1"

app/src/main/AndroidManifest.xml

@@ -20,15 +20,13 @@
         tools:targetApi="34">
         <meta-data
             android:name="com.google.android.geo.API_KEY"
-            android:value="@string/google_api_key" />
+            android:value="${GOOGLE_API_KEY}" />
         <activity
             android:name=".MainActivity"
             android:exported="true"
             android:theme="@style/Theme.TrainHub">
-
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>

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

@@ -15,7 +15,6 @@ import com.example.trainhub.fragments.LocationFragment
 import com.example.trainhub.fragments.ProfileFragment
 import com.google.android.material.bottomnavigation.BottomNavigationView
 
-
 class MainActivity : AppCompatActivity() {
     private var navController: NavController? = null
     private val homeFragment = HomeFragment()
@@ -35,7 +34,6 @@ class MainActivity : AppCompatActivity() {
         }
 
 
-
         bottomNavigationView?.setOnItemSelectedListener {
             when(it.itemId){
                 R.id.icHome -> replaceFragment(homeFragment)
@@ -44,6 +42,7 @@ class MainActivity : AppCompatActivity() {
                 R.id.icLocation -> replaceFragment(locationFragment)
                 R.id.icProfile -> replaceFragment(profileFragment)
             }
+
             true
         }
 
@@ -57,42 +56,16 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
-       bottomNavigationView?.setOnItemSelectedListener { item ->
-            when (item.itemId) {
-
-                R.id.icHome -> {
-
-                    navController?.navigate(R.id.homeFragment)
-                    true
-                }
-                R.id.icDiscover -> {
-
-                    navController?.navigate(R.id.discoverFragment)
-                    true
-                }
-                R.id.icAddPost -> {
-                    navController?.navigate(R.id.addPostFragment)
-                    true
-                }
-                R.id.icLocation -> {
-                    navController?.navigate(R.id.locationFragment)
-                    true
-                }
-                R.id.icProfile -> {
-                    navController?.navigate(R.id.profileFragment)
-                    true
-                }
-                else -> false
 
-            }
-        }
 
     }
+
     fun moveToHome(){
         bottomNavigationView?.selectedItemId = R.id.icHome
         replaceFragment(homeFragment)
     }
 
+
     fun replaceFragment(fragment: Fragment){
         if(fragment!=null){
             val transaction = supportFragmentManager.beginTransaction()