Set up with Fragments, DrawerLayout and Adaptive Icons

app/src/main/java/com/rtbishop/lookingsat/MainActivity.kt

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+package com.rtbishop.lookingsat
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.Toolbar
+import androidx.drawerlayout.widget.DrawerLayout
+import androidx.lifecycle.ViewModelProviders
+import androidx.navigation.findNavController
+import androidx.navigation.ui.AppBarConfiguration
+import androidx.navigation.ui.navigateUp
+import androidx.navigation.ui.setupActionBarWithNavController
+import androidx.navigation.ui.setupWithNavController
+import com.google.android.material.floatingactionbutton.FloatingActionButton
+import com.google.android.material.navigation.NavigationView
+import com.google.android.material.snackbar.Snackbar
+
+class MainActivity : AppCompatActivity() {
+
+    private lateinit var appBarConfig: AppBarConfiguration
+    private lateinit var mainViewModel: MainViewModel
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        mainViewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
+
+        val toolbar: Toolbar = findViewById(R.id.toolbar)
+        setSupportActionBar(toolbar)
+
+        val fab: FloatingActionButton = findViewById(R.id.fab)
+        fab.setOnClickListener { view ->
+            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
+                .setAction("Action", null).show()
+        }
+
+        val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
+        val navView: NavigationView = findViewById(R.id.nav_view)
+        val navController = findNavController(R.id.nav_host)
+
+        appBarConfig =
+            AppBarConfiguration(setOf(R.id.nav_sky, R.id.nav_radar, R.id.nav_map), drawerLayout)
+        setupActionBarWithNavController(navController, appBarConfig)
+        navView.setupWithNavController(navController)
+    }
+
+    override fun onSupportNavigateUp(): Boolean {
+        val navController = findNavController(R.id.nav_host)
+        return navController.navigateUp(appBarConfig) || super.onSupportNavigateUp()
+    }
+}

app/src/main/java/com/rtbishop/lookingsat/MainViewModel.kt

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+package com.rtbishop.lookingsat
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+
+class MainViewModel(application: Application) : AndroidViewModel(application)

app/src/main/java/com/rtbishop/lookingsat/ui/CreditsFragment.kt

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+package com.rtbishop.lookingsat.ui
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.rtbishop.lookingsat.R
+
+class CreditsFragment : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_credits, container, false)
+    }
+}

app/src/main/java/com/rtbishop/lookingsat/ui/RadarFragment.kt

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+package com.rtbishop.lookingsat.ui
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProviders
+import com.rtbishop.lookingsat.MainViewModel
+import com.rtbishop.lookingsat.R
+
+class RadarFragment : Fragment() {
+
+    private lateinit var viewModel: MainViewModel
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
+        return inflater.inflate(R.layout.fragment_radar, container, false)
+    }
+}

app/src/main/java/com/rtbishop/lookingsat/ui/SettingsFragment.kt

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+package com.rtbishop.lookingsat.ui
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProviders
+import com.rtbishop.lookingsat.MainViewModel
+import com.rtbishop.lookingsat.R
+
+class SettingsFragment : Fragment() {
+
+    private lateinit var viewModel: MainViewModel
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
+        return inflater.inflate(R.layout.fragment_sky, container, false)
+    }
+}

app/src/main/java/com/rtbishop/lookingsat/ui/SkyFragment.kt

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+package com.rtbishop.lookingsat.ui
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProviders
+import com.rtbishop.lookingsat.MainViewModel
+import com.rtbishop.lookingsat.R
+
+class SkyFragment : Fragment() {
+
+    private lateinit var viewModel: MainViewModel
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
+        return inflater.inflate(R.layout.fragment_sky, container, false)
+    }
+}

app/src/main/java/com/rtbishop/lookingsat/ui/WorldMapFragment.kt

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+package com.rtbishop.lookingsat.ui
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProviders
+import com.rtbishop.lookingsat.MainViewModel
+import com.rtbishop.lookingsat.R
+
+class WorldMapFragment : Fragment() {
+
+    private lateinit var viewModel: MainViewModel
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
+        return inflater.inflate(R.layout.fragment_worldmap, container, false)
+    }
+}