[ADD] bottomNav functionality

TODO: change placeholder icons

app/src/main/java/com/a1/nextlocation/MainActivity.java

@@ -1,13 +1,21 @@
 package com.a1.nextlocation;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentTransaction;
 
 import android.os.Bundle;
+import android.view.MenuItem;
 
 import com.a1.nextlocation.R;
+import com.a1.nextlocation.fragments.HomeFragment;
+import com.a1.nextlocation.fragments.RouteFragment;
+import com.a1.nextlocation.fragments.SettingsFragment;
+import com.a1.nextlocation.fragments.StatisticFragment;
+import com.google.android.material.bottomnavigation.BottomNavigationView;
 
 public class MainActivity extends AppCompatActivity {
-
     /**
      * onCreate method that creates the main activity
      * @param savedInstanceState the saved instance state of the app
@@ -16,5 +24,33 @@ public class MainActivity extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        BottomNavigationView bottomNav = findViewById(R.id.navbar);
+        bottomNav.setOnNavigationItemSelectedListener(navListener);
+
+        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_layout, new HomeFragment()).commit();
     }
+
+
+    private BottomNavigationView.OnNavigationItemSelectedListener navListener = item -> {
+        Fragment selectedFragment = null;
+
+        switch (item.getItemId()) {
+            case R.id.locations:
+                selectedFragment = new HomeFragment();
+                break;
+            case R.id.routes:
+                selectedFragment = new RouteFragment();
+                break;
+            case R.id.statistics:
+                selectedFragment = new StatisticFragment();
+                break;
+            case R.id.settings:
+                selectedFragment = new SettingsFragment();
+                break;
+        }
+
+        getSupportFragmentManager().beginTransaction().replace(R.id.fragment_layout, selectedFragment).commit();
+        return true;
+    };
 }

app/src/main/res/drawable/ic_home.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M10,20v-6h4v6h5v-8h3L12,3 2,12h3v8z"/>
+</vector>

app/src/main/res/drawable/ic_placeholder.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24"
+        android:viewportHeight="24"
+        android:tint="?attr/colorControlNormal">
+    <path
+        android:pathData="M17.6,11.48 L19.44,8.3a0.63,0.63 0,0 0,-1.09 -0.63l-1.88,3.24a11.43,11.43 0,0 0,-8.94 0L5.65,7.67a0.63,0.63 0,0 0,-1.09 0.63L6.4,11.48A10.81,10.81 0,0 0,1 20L23,20A10.81,10.81 0,0 0,17.6 11.48ZM7,17.25A1.25,1.25 0,1 1,8.25 16,1.25 1.25,0 0,1 7,17.25ZM17,17.25A1.25,1.25 0,1 1,18.25 16,1.25 1.25,0 0,1 17,17.25Z"
+        android:fillColor="@android:color/white"/>
+</vector>

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

@@ -16,7 +16,7 @@
         app:layout_constraintEnd_toEndOf="parent"
         />
 
-    <view
+    <View
         android:id="@+id/scroller_devider"
         android:layout_width="match_parent"
         android:layout_height="1dp"
@@ -40,4 +40,6 @@
         app:menu="@menu/navmenu"
         />
 
+
+
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/menu/navmenu.xml

@@ -4,21 +4,25 @@
     <item
         android:id="@+id/locations"
         android:title="@string/locations"
+        android:icon="@drawable/ic_placeholder"
         />
 
     <item
         android:id="@+id/routes"
         android:title="@string/routes"
+        android:icon="@drawable/ic_placeholder"
         />
 
     <item
         android:id="@+id/statistics"
         android:title="@string/statistics"
+        android:icon="@drawable/ic_placeholder"
         />
 
     <item
         android:id="@+id/settings"
         android:title="@string/settings"
+        android:icon="@drawable/ic_placeholder"
         />
 
 </menu>