Add: Main app, main activity and navigation handling

app/src/main/java/dev/carlos/acronyms/views/MainActivity.kt

@@ -0,0 +1,43 @@
+package dev.carlos.acronyms.views
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.navigation.findNavController
+import androidx.navigation.ui.NavigationUI
+import dev.carlos.acronyms.R
+import dev.carlos.acronyms.di.appModules
+import dev.carlos.acronyms.viewmodel.NavigationViewmodel
+import dev.carlos.core.extensions.findNavHostFragment
+import dev.carlos.core.extensions.observeNonNull
+import dev.carlos.core.navigation.NavigationRouter
+import org.koin.android.ext.android.inject
+import org.koin.android.ext.koin.androidContext
+import org.koin.androidx.viewmodel.ext.android.viewModel
+import org.koin.core.context.startKoin
+
+class MainActivity : AppCompatActivity() {
+
+    private val navController by lazy { findNavController(R.id.main_fragment_container) }
+    private val navRouter: NavigationRouter by inject()
+    private val viewModel: NavigationViewmodel by viewModel()
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        setupNavigation()
+    }
+
+    private fun setupNavigation() {
+        navController.setGraph(R.navigation.main_navigation)
+        navRouter.setOnNavigationEvent {
+            viewModel.onNavigationEvent(it)
+        }
+        viewModel.navigate.observeNonNull(this) { pair ->
+            // Pair.first is a Navigation Id
+            // Pair.second is a Bundle
+            navController.navigate(pair.first, pair.second)
+        }
+
+        NavigationUI.setupActionBarWithNavController(this, navController)
+    }
+}