Adding base app

app/src/main/java/fr/sanchezm/attestationsCovid19/MainActivity.kt

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+package fr.sanchezm.attestationsCovid19
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.navigation.findNavController
+import androidx.navigation.ui.AppBarConfiguration
+import androidx.navigation.ui.setupActionBarWithNavController
+import androidx.navigation.ui.setupWithNavController
+import com.google.android.material.bottomnavigation.BottomNavigationView
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        val navView: BottomNavigationView = findViewById(R.id.nav_view)
+
+        val navController = findNavController(R.id.nav_host_fragment)
+        // Passing each menu ID as a set of Ids because each
+        // menu should be considered as top level destinations.
+        val appBarConfiguration = AppBarConfiguration(
+            setOf(
+                R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications
+            )
+        )
+        setupActionBarWithNavController(navController, appBarConfiguration)
+        navView.setupWithNavController(navController)
+    }
+}

app/src/main/java/fr/sanchezm/attestationsCovid19/ui/dashboard/DashboardFragment.kt

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+package fr.sanchezm.attestationsCovid19.ui.dashboard
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProviders
+import fr.sanchezm.attestationsCovid19.R
+
+class DashboardFragment : Fragment() {
+
+    private lateinit var dashboardViewModel: DashboardViewModel
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        dashboardViewModel =
+            ViewModelProviders.of(this).get(DashboardViewModel::class.java)
+        val root = inflater.inflate(R.layout.fragment_dashboard, container, false)
+        val textView: TextView = root.findViewById(R.id.text_dashboard)
+        dashboardViewModel.text.observe(viewLifecycleOwner, Observer {
+            textView.text = it
+        })
+        return root
+    }
+}

app/src/main/java/fr/sanchezm/attestationsCovid19/ui/dashboard/DashboardViewModel.kt

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+package fr.sanchezm.attestationsCovid19.ui.dashboard
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class DashboardViewModel : ViewModel() {
+
+    private val _text = MutableLiveData<String>().apply {
+        value = "This is dashboard Fragment"
+    }
+    val text: LiveData<String> = _text
+}

app/src/main/java/fr/sanchezm/attestationsCovid19/ui/home/HomeFragment.kt

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+package fr.sanchezm.attestationsCovid19.ui.home
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProviders
+import fr.sanchezm.attestationsCovid19.R
+
+class HomeFragment : Fragment() {
+
+    private lateinit var homeViewModel: HomeViewModel
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        homeViewModel =
+            ViewModelProviders.of(this).get(HomeViewModel::class.java)
+        val root = inflater.inflate(R.layout.fragment_home, container, false)
+        val textView: TextView = root.findViewById(R.id.text_home)
+        homeViewModel.text.observe(viewLifecycleOwner, Observer {
+            textView.text = it
+        })
+        return root
+    }
+}

app/src/main/java/fr/sanchezm/attestationsCovid19/ui/home/HomeViewModel.kt

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+package fr.sanchezm.attestationsCovid19.ui.home
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class HomeViewModel : ViewModel() {
+
+    private val _text = MutableLiveData<String>().apply {
+        value = "This is home Fragment"
+    }
+    val text: LiveData<String> = _text
+}

app/src/main/java/fr/sanchezm/attestationsCovid19/ui/notifications/NotificationsFragment.kt

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+package fr.sanchezm.attestationsCovid19.ui.notifications
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProviders
+import fr.sanchezm.attestationsCovid19.R
+
+class NotificationsFragment : Fragment() {
+
+    private lateinit var notificationsViewModel: NotificationsViewModel
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        notificationsViewModel =
+            ViewModelProviders.of(this).get(NotificationsViewModel::class.java)
+        val root = inflater.inflate(R.layout.fragment_notifications, container, false)
+        val textView: TextView = root.findViewById(R.id.text_notifications)
+        notificationsViewModel.text.observe(viewLifecycleOwner, Observer {
+            textView.text = it
+        })
+        return root
+    }
+}

app/src/main/java/fr/sanchezm/attestationsCovid19/ui/notifications/NotificationsViewModel.kt

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+package fr.sanchezm.attestationsCovid19.ui.notifications
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class NotificationsViewModel : ViewModel() {
+
+    private val _text = MutableLiveData<String>().apply {
+        value = "This is notifications Fragment"
+    }
+    val text: LiveData<String> = _text
+}