implement favorite view

app/src/main/java/com/hako/friendlists/view/MainActivity.kt

@@ -4,18 +4,21 @@ import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import androidx.navigation.findNavController
 import androidx.navigation.ui.NavigationUI.setupActionBarWithNavController
-import com.hako.base.extensions.observeNonNull
+import com.hako.base.extensions.*
 import com.hako.base.navigation.NavigationRouter
+import com.hako.base.navigation.ShowFabButton
 import com.hako.friendlists.BuildConfig
 import com.hako.friendlists.R
 import com.hako.friendlists.viewmodel.NavigationViewmodel
 import com.squareup.picasso.Picasso
+import kotlinx.android.synthetic.main.activity_main.*
 import org.koin.android.ext.android.inject
 import org.koin.androidx.viewmodel.ext.android.viewModel
 
 class MainActivity : AppCompatActivity() {
 
     private val navController by lazy { findNavController(R.id.main_fragment_container) }
+    private val navHostFragment by lazy { findNavHostFragment(R.id.main_fragment_container) }
     private val navRouter: NavigationRouter by inject()
     private val picasso: Picasso by inject()
     private val viewModel: NavigationViewmodel by viewModel()
@@ -39,6 +42,28 @@ class MainActivity : AppCompatActivity() {
         }
 
         setupActionBarWithNavController(this, navController)
+
+        navHostFragment.registerOnFragmentViewCreated { currentFragment ->
+            initializeViews()
+            when (currentFragment) {
+                is ShowFabButton -> fabButtonBehaviour(currentFragment)
+            }
+        }
+    }
+
+    private fun initializeViews() {
+        main_fragment_fab.hide()
+    }
+
+    private fun fabButtonBehaviour(currentFragment: ShowFabButton) {
+        main_fragment_fab.setOnClickListener {
+            currentFragment.fabButtonPressed().invoke()
+        }
+        if (currentFragment.shouldShowFabButton()) {
+            main_fragment_fab.show()
+        } else {
+            main_fragment_fab.hide()
+        }
     }
 
     private fun setupPicasso() {

app/src/main/java/com/hako/friendlists/viewmodel/NavigationViewmodel.kt

@@ -35,6 +35,9 @@ class NavigationViewmodel : ViewModel() {
                     putString(FRAGMENT_TITLE, event.userName)
                 })
             )
+            is UserlistNavigation.ClickedOnFab -> navigate.postValue(
+                buildNavigation(R.id.action_userlistFragment_to_favoriteUserlistFragment)
+            )
         }
     }
 

app/src/main/res/layout/activity_main.xml

@@ -15,4 +15,14 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/main_fragment_fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="end|bottom"
+        android:layout_margin="24dp"
+        android:src="@drawable/ic_heart"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/colors.xml

@@ -2,7 +2,7 @@
 <resources>
     <color name="colorPrimary">#37474F</color>
     <color name="colorPrimaryDark">#324047</color>
-    <color name="colorAccent">#CBCFD1</color>
+    <color name="colorAccent">#D32F2F</color>
     <color name="colorRed">#D32F2F</color>
     <color name="colorDarkGray">#333333</color>
 </resources>